tint: const eval of firstTrailingBit

Bug: tint:1581
Change-Id: I4a9cb113780439849aec10cd0fc8e2f6d2ab55cc
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/107881
Commit-Queue: Antonio Maiorano <amaiorano@google.com>
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>

src/tint/intrinsics.def

@@ -469,8 +469,8 @@ fn extractBits<N: num, T: iu32>(vec<N, T>, u32, u32) -> vec<N, T>
 fn faceForward<N: num, T: f32_f16>(vec<N, T>, vec<N, T>, vec<N, T>) -> vec<N, T>
 @const fn firstLeadingBit<T: iu32>(T) -> T
 @const fn firstLeadingBit<N: num, T: iu32>(vec<N, T>) -> vec<N, T>
-fn firstTrailingBit<T: iu32>(T) -> T
+@const fn firstTrailingBit<T: iu32>(T) -> T
-fn firstTrailingBit<N: num, T: iu32>(vec<N, T>) -> vec<N, T>
+@const fn firstTrailingBit<N: num, T: iu32>(vec<N, T>) -> vec<N, T>
 fn floor<T: f32_f16>(T) -> T
 fn floor<N: num, T: f32_f16>(vec<N, T>) -> vec<N, T>
 fn fma<T: f32_f16>(T, T, T) -> T

src/tint/resolver/const_eval.cc

@@ -209,6 +209,23 @@ auto CountLeadingBits(T e, T bit_value_to_count) -> std::make_unsigned_t<T> {
     return count;
 }
 
+/// @returns the number of consecutive trailing bits set to `@p bit_value_to_count` in `@p e`
+template <typename T>
+auto CountTrailingBits(T e, T bit_value_to_count) -> std::make_unsigned_t<T> {
+    using UT = std::make_unsigned_t<T>;
+    constexpr UT kNumBits = sizeof(UT) * 8;
+    constexpr UT kRightMost = UT{1};
+    const UT b = static_cast<UT>(bit_value_to_count);
+
+    auto v = static_cast<UT>(e);
+    auto count = UT{0};
+    while ((count < kNumBits) && ((v & kRightMost) == b)) {
+        ++count;
+        v >>= 1;
+    }
+    return count;
+}
+
 /// ImplConstant inherits from sem::Constant to add an private implementation method for conversion.
 struct ImplConstant : public sem::Constant {
     /// Convert attempts to convert the constant value to the given type. On error, Convert()
@@ -1695,17 +1712,7 @@ ConstEval::Result ConstEval::countTrailingZeros(const sem::Type* ty,
         auto create = [&](auto e) {
             using NumberT = decltype(e);
             using T = UnwrapNumber<NumberT>;
-            using UT = std::make_unsigned_t<T>;
+            auto count = CountTrailingBits(T{e}, T{0});
-            constexpr UT kNumBits = sizeof(UT) * 8;
-            constexpr UT kRightMost = UT{1};
-
-            auto v = static_cast<UT>(e);
-            auto count = UT{0};
-            while ((count < kNumBits) && ((v & kRightMost) == 0)) {
-                ++count;
-                v >>= 1;
-            }
-
             return CreateElement(builder, c0->Type(), NumberT(count));
         };
         return Dispatch_iu32(create, c0);
@@ -1757,6 +1764,32 @@ ConstEval::Result ConstEval::firstLeadingBit(const sem::Type* ty,
     return TransformElements(builder, ty, transform, args[0]);
 }
 
+ConstEval::Result ConstEval::firstTrailingBit(const sem::Type* ty,
+                                              utils::VectorRef<const sem::Constant*> args,
+                                              const Source&) {
+    auto transform = [&](const sem::Constant* c0) {
+        auto create = [&](auto e) {
+            using NumberT = decltype(e);
+            using T = UnwrapNumber<NumberT>;
+            using UT = std::make_unsigned_t<T>;
+
+            NumberT result;
+            if (e == T{0}) {
+                // T(-1) if e is zero.
+                result = NumberT(static_cast<T>(-1));
+            } else {
+                // Otherwise the position of the least significant 1 bit in e.
+                UT pos = CountTrailingBits(T{e}, T{0});
+                result = NumberT(pos);
+            }
+
+            return CreateElement(builder, c0->Type(), result);
+        };
+        return Dispatch_iu32(create, c0);
+    };
+    return TransformElements(builder, ty, transform, args[0]);
+}
+
 ConstEval::Result ConstEval::saturate(const sem::Type* ty,
                                       utils::VectorRef<const sem::Constant*> args,
                                       const Source&) {

src/tint/resolver/const_eval.h

@@ -476,6 +476,15 @@ class ConstEval {
                            utils::VectorRef<const sem::Constant*> args,
                            const Source& source);
 
+    /// firstTrailingBit builtin
+    /// @param ty the expression type
+    /// @param args the input arguments
+    /// @param source the source location of the conversion
+    /// @return the result value, or null if the value cannot be calculated
+    Result firstTrailingBit(const sem::Type* ty,
+                            utils::VectorRef<const sem::Constant*> args,
+                            const Source& source);
+
     /// saturate builtin
     /// @param ty the expression type
     /// @param args the input arguments

src/tint/resolver/const_eval_builtin_test.cc

@@ -680,6 +680,39 @@ INSTANTIATE_TEST_SUITE_P(  //
                      testing::ValuesIn(Concat(FirstLeadingBitCases<i32>(),  //
                                               FirstLeadingBitCases<u32>()))));
 
+template <typename T>
+std::vector<Case> FirstTrailingBitCases() {
+    using B = BitValues<T>;
+    auto r = std::vector<Case>{
+        C({T(0)}, T(-1)),
+
+        C({B::Lsh(1, 31)}, T(31)),  //
+        C({B::Lsh(1, 30)}, T(30)),  //
+        C({B::Lsh(1, 29)}, T(29)),  //
+        C({B::Lsh(1, 28)}, T(28)),
+        //...
+        C({B::Lsh(1, 3)}, T(3)),  //
+        C({B::Lsh(1, 2)}, T(2)),  //
+        C({B::Lsh(1, 1)}, T(1)),  //
+        C({B::Lsh(1, 0)}, T(0)),
+
+        C({T(0b0000'0000'0100'1000'1000'1000'0000'0000)}, T(11)),
+        C({T(0b0000'0100'1000'1000'1000'0000'0000'0000)}, T(15)),
+
+        // Vector tests
+        C({Vec(B::Lsh(1, 31), B::Lsh(1, 30), B::Lsh(1, 29))}, Vec(T(31), T(30), T(29))),
+        C({Vec(B::Lsh(1, 2), B::Lsh(1, 1), B::Lsh(1, 0))}, Vec(T(2), T(1), T(0))),
+    };
+
+    return r;
+}
+INSTANTIATE_TEST_SUITE_P(  //
+    FirstTrailingBit,
+    ResolverConstEvalBuiltinTest,
+    testing::Combine(testing::Values(sem::BuiltinType::kFirstTrailingBit),
+                     testing::ValuesIn(Concat(FirstTrailingBitCases<i32>(),  //
+                                              FirstTrailingBitCases<u32>()))));
+
 template <typename T>
 std::vector<Case> SaturateCases() {
     return {

src/tint/resolver/intrinsic_table.inl

@@ -13516,7 +13516,7 @@ constexpr OverloadInfo kOverloads[] = {
     /* parameters */ &kParameters[908],
     /* return matcher indices */ &kMatcherIndices[1],
     /* flags */ OverloadFlags(OverloadFlag::kIsBuiltin, OverloadFlag::kSupportsVertexPipeline, OverloadFlag::kSupportsFragmentPipeline, OverloadFlag::kSupportsComputePipeline),
-    /* const eval */ nullptr,
+    /* const eval */ &ConstEval::firstTrailingBit,
   },
   {
     /* [433] */
@@ -13528,7 +13528,7 @@ constexpr OverloadInfo kOverloads[] = {
     /* parameters */ &kParameters[907],
     /* return matcher indices */ &kMatcherIndices[30],
     /* flags */ OverloadFlags(OverloadFlag::kIsBuiltin, OverloadFlag::kSupportsVertexPipeline, OverloadFlag::kSupportsFragmentPipeline, OverloadFlag::kSupportsComputePipeline),
-    /* const eval */ nullptr,
+    /* const eval */ &ConstEval::firstTrailingBit,
   },
   {
     /* [434] */

test/tint/builtins/gen/literal/firstTrailingBit/110f2c.wgsl.expected.dxc.hlsl

@@ -1,20 +1,5 @@
-uint4 tint_first_trailing_bit(uint4 v) {
-  uint4 x = uint4(v);
-  const uint4 b16 = (bool4((x & (65535u).xxxx)) ? (0u).xxxx : (16u).xxxx);
-  x = (x >> b16);
-  const uint4 b8 = (bool4((x & (255u).xxxx)) ? (0u).xxxx : (8u).xxxx);
-  x = (x >> b8);
-  const uint4 b4 = (bool4((x & (15u).xxxx)) ? (0u).xxxx : (4u).xxxx);
-  x = (x >> b4);
-  const uint4 b2 = (bool4((x & (3u).xxxx)) ? (0u).xxxx : (2u).xxxx);
-  x = (x >> b2);
-  const uint4 b1 = (bool4((x & (1u).xxxx)) ? (0u).xxxx : (1u).xxxx);
-  const uint4 is_zero = ((x == (0u).xxxx) ? (4294967295u).xxxx : (0u).xxxx);
-  return uint4((((((b16 | b8) | b4) | b2) | b1) | is_zero));
-}
-
 void firstTrailingBit_110f2c() {
-  uint4 res = tint_first_trailing_bit((1u).xxxx);
+  uint4 res = (0u).xxxx;
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/firstTrailingBit/110f2c.wgsl.expected.fxc.hlsl

@@ -1,20 +1,5 @@
-uint4 tint_first_trailing_bit(uint4 v) {
-  uint4 x = uint4(v);
-  const uint4 b16 = (bool4((x & (65535u).xxxx)) ? (0u).xxxx : (16u).xxxx);
-  x = (x >> b16);
-  const uint4 b8 = (bool4((x & (255u).xxxx)) ? (0u).xxxx : (8u).xxxx);
-  x = (x >> b8);
-  const uint4 b4 = (bool4((x & (15u).xxxx)) ? (0u).xxxx : (4u).xxxx);
-  x = (x >> b4);
-  const uint4 b2 = (bool4((x & (3u).xxxx)) ? (0u).xxxx : (2u).xxxx);
-  x = (x >> b2);
-  const uint4 b1 = (bool4((x & (1u).xxxx)) ? (0u).xxxx : (1u).xxxx);
-  const uint4 is_zero = ((x == (0u).xxxx) ? (4294967295u).xxxx : (0u).xxxx);
-  return uint4((((((b16 | b8) | b4) | b2) | b1) | is_zero));
-}
-
 void firstTrailingBit_110f2c() {
-  uint4 res = tint_first_trailing_bit((1u).xxxx);
+  uint4 res = (0u).xxxx;
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/firstTrailingBit/110f2c.wgsl.expected.glsl

@@ -1,22 +1,7 @@
 #version 310 es
 
-uvec4 tint_first_trailing_bit(uvec4 v) {
-  uvec4 x = uvec4(v);
-  uvec4 b16 = mix(uvec4(16u), uvec4(0u), bvec4((x & uvec4(65535u))));
-  x = (x >> b16);
-  uvec4 b8 = mix(uvec4(8u), uvec4(0u), bvec4((x & uvec4(255u))));
-  x = (x >> b8);
-  uvec4 b4 = mix(uvec4(4u), uvec4(0u), bvec4((x & uvec4(15u))));
-  x = (x >> b4);
-  uvec4 b2 = mix(uvec4(2u), uvec4(0u), bvec4((x & uvec4(3u))));
-  x = (x >> b2);
-  uvec4 b1 = mix(uvec4(1u), uvec4(0u), bvec4((x & uvec4(1u))));
-  uvec4 is_zero = mix(uvec4(0u), uvec4(4294967295u), equal(x, uvec4(0u)));
-  return uvec4((((((b16 | b8) | b4) | b2) | b1) | is_zero));
-}
-
 void firstTrailingBit_110f2c() {
-  uvec4 res = tint_first_trailing_bit(uvec4(1u));
+  uvec4 res = uvec4(0u);
 }
 
 vec4 vertex_main() {
@@ -35,23 +20,8 @@ void main() {
 #version 310 es
 precision mediump float;
 
-uvec4 tint_first_trailing_bit(uvec4 v) {
-  uvec4 x = uvec4(v);
-  uvec4 b16 = mix(uvec4(16u), uvec4(0u), bvec4((x & uvec4(65535u))));
-  x = (x >> b16);
-  uvec4 b8 = mix(uvec4(8u), uvec4(0u), bvec4((x & uvec4(255u))));
-  x = (x >> b8);
-  uvec4 b4 = mix(uvec4(4u), uvec4(0u), bvec4((x & uvec4(15u))));
-  x = (x >> b4);
-  uvec4 b2 = mix(uvec4(2u), uvec4(0u), bvec4((x & uvec4(3u))));
-  x = (x >> b2);
-  uvec4 b1 = mix(uvec4(1u), uvec4(0u), bvec4((x & uvec4(1u))));
-  uvec4 is_zero = mix(uvec4(0u), uvec4(4294967295u), equal(x, uvec4(0u)));
-  return uvec4((((((b16 | b8) | b4) | b2) | b1) | is_zero));
-}
-
 void firstTrailingBit_110f2c() {
-  uvec4 res = tint_first_trailing_bit(uvec4(1u));
+  uvec4 res = uvec4(0u);
 }
 
 void fragment_main() {
@@ -64,23 +34,8 @@ void main() {
 }
 #version 310 es
 
-uvec4 tint_first_trailing_bit(uvec4 v) {
-  uvec4 x = uvec4(v);
-  uvec4 b16 = mix(uvec4(16u), uvec4(0u), bvec4((x & uvec4(65535u))));
-  x = (x >> b16);
-  uvec4 b8 = mix(uvec4(8u), uvec4(0u), bvec4((x & uvec4(255u))));
-  x = (x >> b8);
-  uvec4 b4 = mix(uvec4(4u), uvec4(0u), bvec4((x & uvec4(15u))));
-  x = (x >> b4);
-  uvec4 b2 = mix(uvec4(2u), uvec4(0u), bvec4((x & uvec4(3u))));
-  x = (x >> b2);
-  uvec4 b1 = mix(uvec4(1u), uvec4(0u), bvec4((x & uvec4(1u))));
-  uvec4 is_zero = mix(uvec4(0u), uvec4(4294967295u), equal(x, uvec4(0u)));
-  return uvec4((((((b16 | b8) | b4) | b2) | b1) | is_zero));
-}
-
 void firstTrailingBit_110f2c() {
-  uvec4 res = tint_first_trailing_bit(uvec4(1u));
+  uvec4 res = uvec4(0u);
 }
 
 void compute_main() {

test/tint/builtins/gen/literal/firstTrailingBit/110f2c.wgsl.expected.msl

@@ -1,23 +1,8 @@
 #include <metal_stdlib>
 
 using namespace metal;
-uint4 tint_first_trailing_bit(uint4 v) {
-  uint4 x = uint4(v);
-  uint4 const b16 = select(uint4(16u), uint4(0u), bool4((x & uint4(65535u))));
-  x = (x >> b16);
-  uint4 const b8 = select(uint4(8u), uint4(0u), bool4((x & uint4(255u))));
-  x = (x >> b8);
-  uint4 const b4 = select(uint4(4u), uint4(0u), bool4((x & uint4(15u))));
-  x = (x >> b4);
-  uint4 const b2 = select(uint4(2u), uint4(0u), bool4((x & uint4(3u))));
-  x = (x >> b2);
-  uint4 const b1 = select(uint4(1u), uint4(0u), bool4((x & uint4(1u))));
-  uint4 const is_zero = select(uint4(0u), uint4(4294967295u), (x == uint4(0u)));
-  return uint4((((((b16 | b8) | b4) | b2) | b1) | is_zero));
-}
-
 void firstTrailingBit_110f2c() {
-  uint4 res = tint_first_trailing_bit(uint4(1u));
+  uint4 res = uint4(0u);
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/firstTrailingBit/110f2c.wgsl.expected.spvasm

@@ -1,7 +1,7 @@
 ; SPIR-V
 ; Version: 1.3
 ; Generator: Google Tint Compiler; 0
-; Bound: 98
+; Bound: 32
 ; Schema: 0
                OpCapability Shader
                OpMemoryModel Logical GLSL450
@@ -12,9 +12,6 @@
                OpExecutionMode %compute_main LocalSize 1 1 1
                OpName %value "value"
                OpName %vertex_point_size "vertex_point_size"
-               OpName %tint_first_trailing_bit "tint_first_trailing_bit"
-               OpName %v "v"
-               OpName %x "x"
                OpName %firstTrailingBit_110f2c "firstTrailingBit_110f2c"
                OpName %res "res"
                OpName %vertex_main_inner "vertex_main_inner"
@@ -31,110 +28,39 @@
 %_ptr_Output_float = OpTypePointer Output %float
           %8 = OpConstantNull %float
 %vertex_point_size = OpVariable %_ptr_Output_float Output %8
+       %void = OpTypeVoid
+          %9 = OpTypeFunction %void
        %uint = OpTypeInt 32 0
      %v4uint = OpTypeVector %uint 4
-          %9 = OpTypeFunction %v4uint %v4uint
+         %15 = OpConstantNull %v4uint
 %_ptr_Function_v4uint = OpTypePointer Function %v4uint
-         %18 = OpConstantNull %v4uint
+         %18 = OpTypeFunction %v4float
-       %bool = OpTypeBool
-     %v4bool = OpTypeVector %bool 4
- %uint_65535 = OpConstant %uint 65535
-         %25 = OpConstantComposite %v4uint %uint_65535 %uint_65535 %uint_65535 %uint_65535
-    %uint_16 = OpConstant %uint 16
-         %28 = OpConstantComposite %v4uint %uint_16 %uint_16 %uint_16 %uint_16
-   %uint_255 = OpConstant %uint 255
-         %35 = OpConstantComposite %v4uint %uint_255 %uint_255 %uint_255 %uint_255
-     %uint_8 = OpConstant %uint 8
-         %38 = OpConstantComposite %v4uint %uint_8 %uint_8 %uint_8 %uint_8
-    %uint_15 = OpConstant %uint 15
-         %45 = OpConstantComposite %v4uint %uint_15 %uint_15 %uint_15 %uint_15
-     %uint_4 = OpConstant %uint 4
-         %48 = OpConstantComposite %v4uint %uint_4 %uint_4 %uint_4 %uint_4
-     %uint_3 = OpConstant %uint 3
-         %55 = OpConstantComposite %v4uint %uint_3 %uint_3 %uint_3 %uint_3
-     %uint_2 = OpConstant %uint 2
-         %58 = OpConstantComposite %v4uint %uint_2 %uint_2 %uint_2 %uint_2
-     %uint_1 = OpConstant %uint 1
-         %65 = OpConstantComposite %v4uint %uint_1 %uint_1 %uint_1 %uint_1
-%uint_4294967295 = OpConstant %uint 4294967295
-         %71 = OpConstantComposite %v4uint %uint_4294967295 %uint_4294967295 %uint_4294967295 %uint_4294967295
-       %void = OpTypeVoid
-         %78 = OpTypeFunction %void
-         %84 = OpTypeFunction %v4float
     %float_1 = OpConstant %float 1
-%tint_first_trailing_bit = OpFunction %v4uint None %9
+%firstTrailingBit_110f2c = OpFunction %void None %9
-          %v = OpFunctionParameter %v4uint
+         %12 = OpLabel
-         %14 = OpLabel
+        %res = OpVariable %_ptr_Function_v4uint Function %15
-          %x = OpVariable %_ptr_Function_v4uint Function %18
+               OpStore %res %15
-               OpStore %x %v
-         %23 = OpLoad %v4uint %x
-         %26 = OpBitwiseAnd %v4uint %23 %25
-         %20 = OpINotEqual %v4bool %26 %18
-         %19 = OpSelect %v4uint %20 %18 %28
-         %29 = OpLoad %v4uint %x
-         %30 = OpShiftRightLogical %v4uint %29 %19
-               OpStore %x %30
-         %33 = OpLoad %v4uint %x
-         %36 = OpBitwiseAnd %v4uint %33 %35
-         %32 = OpINotEqual %v4bool %36 %18
-         %31 = OpSelect %v4uint %32 %18 %38
-         %39 = OpLoad %v4uint %x
-         %40 = OpShiftRightLogical %v4uint %39 %31
-               OpStore %x %40
-         %43 = OpLoad %v4uint %x
-         %46 = OpBitwiseAnd %v4uint %43 %45
-         %42 = OpINotEqual %v4bool %46 %18
-         %41 = OpSelect %v4uint %42 %18 %48
-         %49 = OpLoad %v4uint %x
-         %50 = OpShiftRightLogical %v4uint %49 %41
-               OpStore %x %50
-         %53 = OpLoad %v4uint %x
-         %56 = OpBitwiseAnd %v4uint %53 %55
-         %52 = OpINotEqual %v4bool %56 %18
-         %51 = OpSelect %v4uint %52 %18 %58
-         %59 = OpLoad %v4uint %x
-         %60 = OpShiftRightLogical %v4uint %59 %51
-               OpStore %x %60
-         %63 = OpLoad %v4uint %x
-         %66 = OpBitwiseAnd %v4uint %63 %65
-         %62 = OpINotEqual %v4bool %66 %18
-         %61 = OpSelect %v4uint %62 %18 %65
-         %68 = OpLoad %v4uint %x
-         %69 = OpIEqual %v4bool %68 %18
-         %67 = OpSelect %v4uint %69 %71 %18
-         %73 = OpBitwiseOr %v4uint %19 %31
-         %74 = OpBitwiseOr %v4uint %73 %41
-         %75 = OpBitwiseOr %v4uint %74 %51
-         %76 = OpBitwiseOr %v4uint %75 %61
-         %77 = OpBitwiseOr %v4uint %76 %67
-               OpReturnValue %77
-               OpFunctionEnd
-%firstTrailingBit_110f2c = OpFunction %void None %78
-         %81 = OpLabel
-        %res = OpVariable %_ptr_Function_v4uint Function %18
-         %82 = OpFunctionCall %v4uint %tint_first_trailing_bit %65
-               OpStore %res %82
                OpReturn
                OpFunctionEnd
-%vertex_main_inner = OpFunction %v4float None %84
+%vertex_main_inner = OpFunction %v4float None %18
-         %86 = OpLabel
+         %20 = OpLabel
-         %87 = OpFunctionCall %void %firstTrailingBit_110f2c
+         %21 = OpFunctionCall %void %firstTrailingBit_110f2c
                OpReturnValue %5
                OpFunctionEnd
-%vertex_main = OpFunction %void None %78
+%vertex_main = OpFunction %void None %9
-         %89 = OpLabel
+         %23 = OpLabel
-         %90 = OpFunctionCall %v4float %vertex_main_inner
+         %24 = OpFunctionCall %v4float %vertex_main_inner
-               OpStore %value %90
+               OpStore %value %24
                OpStore %vertex_point_size %float_1
                OpReturn
                OpFunctionEnd
-%fragment_main = OpFunction %void None %78
+%fragment_main = OpFunction %void None %9
-         %93 = OpLabel
+         %27 = OpLabel
-         %94 = OpFunctionCall %void %firstTrailingBit_110f2c
+         %28 = OpFunctionCall %void %firstTrailingBit_110f2c
                OpReturn
                OpFunctionEnd
-%compute_main = OpFunction %void None %78
+%compute_main = OpFunction %void None %9
-         %96 = OpLabel
+         %30 = OpLabel
-         %97 = OpFunctionCall %void %firstTrailingBit_110f2c
+         %31 = OpFunctionCall %void %firstTrailingBit_110f2c
                OpReturn
                OpFunctionEnd

test/tint/builtins/gen/literal/firstTrailingBit/3a2acc.wgsl.expected.dxc.hlsl

@@ -1,20 +1,5 @@
-int tint_first_trailing_bit(int v) {
-  uint x = uint(v);
-  const uint b16 = (bool((x & 65535u)) ? 0u : 16u);
-  x = (x >> b16);
-  const uint b8 = (bool((x & 255u)) ? 0u : 8u);
-  x = (x >> b8);
-  const uint b4 = (bool((x & 15u)) ? 0u : 4u);
-  x = (x >> b4);
-  const uint b2 = (bool((x & 3u)) ? 0u : 2u);
-  x = (x >> b2);
-  const uint b1 = (bool((x & 1u)) ? 0u : 1u);
-  const uint is_zero = ((x == 0u) ? 4294967295u : 0u);
-  return int((((((b16 | b8) | b4) | b2) | b1) | is_zero));
-}
-
 void firstTrailingBit_3a2acc() {
-  int res = tint_first_trailing_bit(1);
+  int res = 0;
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/firstTrailingBit/3a2acc.wgsl.expected.fxc.hlsl

@@ -1,20 +1,5 @@
-int tint_first_trailing_bit(int v) {
-  uint x = uint(v);
-  const uint b16 = (bool((x & 65535u)) ? 0u : 16u);
-  x = (x >> b16);
-  const uint b8 = (bool((x & 255u)) ? 0u : 8u);
-  x = (x >> b8);
-  const uint b4 = (bool((x & 15u)) ? 0u : 4u);
-  x = (x >> b4);
-  const uint b2 = (bool((x & 3u)) ? 0u : 2u);
-  x = (x >> b2);
-  const uint b1 = (bool((x & 1u)) ? 0u : 1u);
-  const uint is_zero = ((x == 0u) ? 4294967295u : 0u);
-  return int((((((b16 | b8) | b4) | b2) | b1) | is_zero));
-}
-
 void firstTrailingBit_3a2acc() {
-  int res = tint_first_trailing_bit(1);
+  int res = 0;
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/firstTrailingBit/3a2acc.wgsl.expected.glsl

@@ -1,22 +1,7 @@
 #version 310 es
 
-int tint_first_trailing_bit(int v) {
-  uint x = uint(v);
-  uint b16 = (bool((x & 65535u)) ? 0u : 16u);
-  x = (x >> b16);
-  uint b8 = (bool((x & 255u)) ? 0u : 8u);
-  x = (x >> b8);
-  uint b4 = (bool((x & 15u)) ? 0u : 4u);
-  x = (x >> b4);
-  uint b2 = (bool((x & 3u)) ? 0u : 2u);
-  x = (x >> b2);
-  uint b1 = (bool((x & 1u)) ? 0u : 1u);
-  uint is_zero = ((x == 0u) ? 4294967295u : 0u);
-  return int((((((b16 | b8) | b4) | b2) | b1) | is_zero));
-}
-
 void firstTrailingBit_3a2acc() {
-  int res = tint_first_trailing_bit(1);
+  int res = 0;
 }
 
 vec4 vertex_main() {
@@ -35,23 +20,8 @@ void main() {
 #version 310 es
 precision mediump float;
 
-int tint_first_trailing_bit(int v) {
-  uint x = uint(v);
-  uint b16 = (bool((x & 65535u)) ? 0u : 16u);
-  x = (x >> b16);
-  uint b8 = (bool((x & 255u)) ? 0u : 8u);
-  x = (x >> b8);
-  uint b4 = (bool((x & 15u)) ? 0u : 4u);
-  x = (x >> b4);
-  uint b2 = (bool((x & 3u)) ? 0u : 2u);
-  x = (x >> b2);
-  uint b1 = (bool((x & 1u)) ? 0u : 1u);
-  uint is_zero = ((x == 0u) ? 4294967295u : 0u);
-  return int((((((b16 | b8) | b4) | b2) | b1) | is_zero));
-}
-
 void firstTrailingBit_3a2acc() {
-  int res = tint_first_trailing_bit(1);
+  int res = 0;
 }
 
 void fragment_main() {
@@ -64,23 +34,8 @@ void main() {
 }
 #version 310 es
 
-int tint_first_trailing_bit(int v) {
-  uint x = uint(v);
-  uint b16 = (bool((x & 65535u)) ? 0u : 16u);
-  x = (x >> b16);
-  uint b8 = (bool((x & 255u)) ? 0u : 8u);
-  x = (x >> b8);
-  uint b4 = (bool((x & 15u)) ? 0u : 4u);
-  x = (x >> b4);
-  uint b2 = (bool((x & 3u)) ? 0u : 2u);
-  x = (x >> b2);
-  uint b1 = (bool((x & 1u)) ? 0u : 1u);
-  uint is_zero = ((x == 0u) ? 4294967295u : 0u);
-  return int((((((b16 | b8) | b4) | b2) | b1) | is_zero));
-}
-
 void firstTrailingBit_3a2acc() {
-  int res = tint_first_trailing_bit(1);
+  int res = 0;
 }
 
 void compute_main() {

test/tint/builtins/gen/literal/firstTrailingBit/3a2acc.wgsl.expected.msl

@@ -1,23 +1,8 @@
 #include <metal_stdlib>
 
 using namespace metal;
-int tint_first_trailing_bit(int v) {
-  uint x = uint(v);
-  uint const b16 = select(16u, 0u, bool((x & 65535u)));
-  x = (x >> b16);
-  uint const b8 = select(8u, 0u, bool((x & 255u)));
-  x = (x >> b8);
-  uint const b4 = select(4u, 0u, bool((x & 15u)));
-  x = (x >> b4);
-  uint const b2 = select(2u, 0u, bool((x & 3u)));
-  x = (x >> b2);
-  uint const b1 = select(1u, 0u, bool((x & 1u)));
-  uint const is_zero = select(0u, 4294967295u, (x == 0u));
-  return int((((((b16 | b8) | b4) | b2) | b1) | is_zero));
-}
-
 void firstTrailingBit_3a2acc() {
-  int res = tint_first_trailing_bit(1);
+  int res = 0;
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/firstTrailingBit/3a2acc.wgsl.expected.spvasm

@@ -1,7 +1,7 @@
 ; SPIR-V
 ; Version: 1.3
 ; Generator: Google Tint Compiler; 0
-; Bound: 90
+; Bound: 31
 ; Schema: 0
                OpCapability Shader
                OpMemoryModel Logical GLSL450
@@ -12,9 +12,6 @@
                OpExecutionMode %compute_main LocalSize 1 1 1
                OpName %value "value"
                OpName %vertex_point_size "vertex_point_size"
-               OpName %tint_first_trailing_bit "tint_first_trailing_bit"
-               OpName %v "v"
-               OpName %x "x"
                OpName %firstTrailingBit_3a2acc "firstTrailingBit_3a2acc"
                OpName %res "res"
                OpName %vertex_main_inner "vertex_main_inner"
@@ -31,104 +28,38 @@
 %_ptr_Output_float = OpTypePointer Output %float
           %8 = OpConstantNull %float
 %vertex_point_size = OpVariable %_ptr_Output_float Output %8
-        %int = OpTypeInt 32 1
-          %9 = OpTypeFunction %int %int
-       %uint = OpTypeInt 32 0
-%_ptr_Function_uint = OpTypePointer Function %uint
-         %18 = OpConstantNull %uint
-       %bool = OpTypeBool
- %uint_65535 = OpConstant %uint 65535
-    %uint_16 = OpConstant %uint 16
-   %uint_255 = OpConstant %uint 255
-     %uint_8 = OpConstant %uint 8
-    %uint_15 = OpConstant %uint 15
-     %uint_4 = OpConstant %uint 4
-     %uint_3 = OpConstant %uint 3
-     %uint_2 = OpConstant %uint 2
-     %uint_1 = OpConstant %uint 1
-%uint_4294967295 = OpConstant %uint 4294967295
        %void = OpTypeVoid
-         %67 = OpTypeFunction %void
+          %9 = OpTypeFunction %void
-      %int_1 = OpConstant %int 1
+        %int = OpTypeInt 32 1
+         %14 = OpConstantNull %int
 %_ptr_Function_int = OpTypePointer Function %int
-         %75 = OpConstantNull %int
+         %17 = OpTypeFunction %v4float
-         %76 = OpTypeFunction %v4float
     %float_1 = OpConstant %float 1
-%tint_first_trailing_bit = OpFunction %int None %9
+%firstTrailingBit_3a2acc = OpFunction %void None %9
-          %v = OpFunctionParameter %int
+         %12 = OpLabel
-         %13 = OpLabel
+        %res = OpVariable %_ptr_Function_int Function %14
-          %x = OpVariable %_ptr_Function_uint Function %18
+               OpStore %res %14
-         %14 = OpBitcast %uint %v
-               OpStore %x %14
-         %22 = OpLoad %uint %x
-         %24 = OpBitwiseAnd %uint %22 %uint_65535
-         %20 = OpINotEqual %bool %24 %18
-         %19 = OpSelect %uint %20 %18 %uint_16
-         %26 = OpLoad %uint %x
-         %27 = OpShiftRightLogical %uint %26 %19
-               OpStore %x %27
-         %30 = OpLoad %uint %x
-         %32 = OpBitwiseAnd %uint %30 %uint_255
-         %29 = OpINotEqual %bool %32 %18
-         %28 = OpSelect %uint %29 %18 %uint_8
-         %34 = OpLoad %uint %x
-         %35 = OpShiftRightLogical %uint %34 %28
-               OpStore %x %35
-         %38 = OpLoad %uint %x
-         %40 = OpBitwiseAnd %uint %38 %uint_15
-         %37 = OpINotEqual %bool %40 %18
-         %36 = OpSelect %uint %37 %18 %uint_4
-         %42 = OpLoad %uint %x
-         %43 = OpShiftRightLogical %uint %42 %36
-               OpStore %x %43
-         %46 = OpLoad %uint %x
-         %48 = OpBitwiseAnd %uint %46 %uint_3
-         %45 = OpINotEqual %bool %48 %18
-         %44 = OpSelect %uint %45 %18 %uint_2
-         %50 = OpLoad %uint %x
-         %51 = OpShiftRightLogical %uint %50 %44
-               OpStore %x %51
-         %54 = OpLoad %uint %x
-         %56 = OpBitwiseAnd %uint %54 %uint_1
-         %53 = OpINotEqual %bool %56 %18
-         %52 = OpSelect %uint %53 %18 %uint_1
-         %58 = OpLoad %uint %x
-         %59 = OpIEqual %bool %58 %18
-         %57 = OpSelect %uint %59 %uint_4294967295 %18
-         %62 = OpBitwiseOr %uint %19 %28
-         %63 = OpBitwiseOr %uint %62 %36
-         %64 = OpBitwiseOr %uint %63 %44
-         %65 = OpBitwiseOr %uint %64 %52
-         %66 = OpBitwiseOr %uint %65 %57
-         %61 = OpBitcast %int %66
-               OpReturnValue %61
-               OpFunctionEnd
-%firstTrailingBit_3a2acc = OpFunction %void None %67
-         %70 = OpLabel
-        %res = OpVariable %_ptr_Function_int Function %75
-         %71 = OpFunctionCall %int %tint_first_trailing_bit %int_1
-               OpStore %res %71
                OpReturn
                OpFunctionEnd
-%vertex_main_inner = OpFunction %v4float None %76
+%vertex_main_inner = OpFunction %v4float None %17
-         %78 = OpLabel
+         %19 = OpLabel
-         %79 = OpFunctionCall %void %firstTrailingBit_3a2acc
+         %20 = OpFunctionCall %void %firstTrailingBit_3a2acc
                OpReturnValue %5
                OpFunctionEnd
-%vertex_main = OpFunction %void None %67
+%vertex_main = OpFunction %void None %9
-         %81 = OpLabel
+         %22 = OpLabel
-         %82 = OpFunctionCall %v4float %vertex_main_inner
+         %23 = OpFunctionCall %v4float %vertex_main_inner
-               OpStore %value %82
+               OpStore %value %23
                OpStore %vertex_point_size %float_1
                OpReturn
                OpFunctionEnd
-%fragment_main = OpFunction %void None %67
+%fragment_main = OpFunction %void None %9
-         %85 = OpLabel
+         %26 = OpLabel
-         %86 = OpFunctionCall %void %firstTrailingBit_3a2acc
+         %27 = OpFunctionCall %void %firstTrailingBit_3a2acc
                OpReturn
                OpFunctionEnd
-%compute_main = OpFunction %void None %67
+%compute_main = OpFunction %void None %9
-         %88 = OpLabel
+         %29 = OpLabel
-         %89 = OpFunctionCall %void %firstTrailingBit_3a2acc
+         %30 = OpFunctionCall %void %firstTrailingBit_3a2acc
                OpReturn
                OpFunctionEnd

test/tint/builtins/gen/literal/firstTrailingBit/45eb10.wgsl.expected.dxc.hlsl

@@ -1,20 +1,5 @@
-uint2 tint_first_trailing_bit(uint2 v) {
-  uint2 x = uint2(v);
-  const uint2 b16 = (bool2((x & (65535u).xx)) ? (0u).xx : (16u).xx);
-  x = (x >> b16);
-  const uint2 b8 = (bool2((x & (255u).xx)) ? (0u).xx : (8u).xx);
-  x = (x >> b8);
-  const uint2 b4 = (bool2((x & (15u).xx)) ? (0u).xx : (4u).xx);
-  x = (x >> b4);
-  const uint2 b2 = (bool2((x & (3u).xx)) ? (0u).xx : (2u).xx);
-  x = (x >> b2);
-  const uint2 b1 = (bool2((x & (1u).xx)) ? (0u).xx : (1u).xx);
-  const uint2 is_zero = ((x == (0u).xx) ? (4294967295u).xx : (0u).xx);
-  return uint2((((((b16 | b8) | b4) | b2) | b1) | is_zero));
-}
-
 void firstTrailingBit_45eb10() {
-  uint2 res = tint_first_trailing_bit((1u).xx);
+  uint2 res = (0u).xx;
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/firstTrailingBit/45eb10.wgsl.expected.fxc.hlsl

@@ -1,20 +1,5 @@
-uint2 tint_first_trailing_bit(uint2 v) {
-  uint2 x = uint2(v);
-  const uint2 b16 = (bool2((x & (65535u).xx)) ? (0u).xx : (16u).xx);
-  x = (x >> b16);
-  const uint2 b8 = (bool2((x & (255u).xx)) ? (0u).xx : (8u).xx);
-  x = (x >> b8);
-  const uint2 b4 = (bool2((x & (15u).xx)) ? (0u).xx : (4u).xx);
-  x = (x >> b4);
-  const uint2 b2 = (bool2((x & (3u).xx)) ? (0u).xx : (2u).xx);
-  x = (x >> b2);
-  const uint2 b1 = (bool2((x & (1u).xx)) ? (0u).xx : (1u).xx);
-  const uint2 is_zero = ((x == (0u).xx) ? (4294967295u).xx : (0u).xx);
-  return uint2((((((b16 | b8) | b4) | b2) | b1) | is_zero));
-}
-
 void firstTrailingBit_45eb10() {
-  uint2 res = tint_first_trailing_bit((1u).xx);
+  uint2 res = (0u).xx;
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/firstTrailingBit/45eb10.wgsl.expected.glsl

@@ -1,22 +1,7 @@
 #version 310 es
 
-uvec2 tint_first_trailing_bit(uvec2 v) {
-  uvec2 x = uvec2(v);
-  uvec2 b16 = mix(uvec2(16u), uvec2(0u), bvec2((x & uvec2(65535u))));
-  x = (x >> b16);
-  uvec2 b8 = mix(uvec2(8u), uvec2(0u), bvec2((x & uvec2(255u))));
-  x = (x >> b8);
-  uvec2 b4 = mix(uvec2(4u), uvec2(0u), bvec2((x & uvec2(15u))));
-  x = (x >> b4);
-  uvec2 b2 = mix(uvec2(2u), uvec2(0u), bvec2((x & uvec2(3u))));
-  x = (x >> b2);
-  uvec2 b1 = mix(uvec2(1u), uvec2(0u), bvec2((x & uvec2(1u))));
-  uvec2 is_zero = mix(uvec2(0u), uvec2(4294967295u), equal(x, uvec2(0u)));
-  return uvec2((((((b16 | b8) | b4) | b2) | b1) | is_zero));
-}
-
 void firstTrailingBit_45eb10() {
-  uvec2 res = tint_first_trailing_bit(uvec2(1u));
+  uvec2 res = uvec2(0u);
 }
 
 vec4 vertex_main() {
@@ -35,23 +20,8 @@ void main() {
 #version 310 es
 precision mediump float;
 
-uvec2 tint_first_trailing_bit(uvec2 v) {
-  uvec2 x = uvec2(v);
-  uvec2 b16 = mix(uvec2(16u), uvec2(0u), bvec2((x & uvec2(65535u))));
-  x = (x >> b16);
-  uvec2 b8 = mix(uvec2(8u), uvec2(0u), bvec2((x & uvec2(255u))));
-  x = (x >> b8);
-  uvec2 b4 = mix(uvec2(4u), uvec2(0u), bvec2((x & uvec2(15u))));
-  x = (x >> b4);
-  uvec2 b2 = mix(uvec2(2u), uvec2(0u), bvec2((x & uvec2(3u))));
-  x = (x >> b2);
-  uvec2 b1 = mix(uvec2(1u), uvec2(0u), bvec2((x & uvec2(1u))));
-  uvec2 is_zero = mix(uvec2(0u), uvec2(4294967295u), equal(x, uvec2(0u)));
-  return uvec2((((((b16 | b8) | b4) | b2) | b1) | is_zero));
-}
-
 void firstTrailingBit_45eb10() {
-  uvec2 res = tint_first_trailing_bit(uvec2(1u));
+  uvec2 res = uvec2(0u);
 }
 
 void fragment_main() {
@@ -64,23 +34,8 @@ void main() {
 }
 #version 310 es
 
-uvec2 tint_first_trailing_bit(uvec2 v) {
-  uvec2 x = uvec2(v);
-  uvec2 b16 = mix(uvec2(16u), uvec2(0u), bvec2((x & uvec2(65535u))));
-  x = (x >> b16);
-  uvec2 b8 = mix(uvec2(8u), uvec2(0u), bvec2((x & uvec2(255u))));
-  x = (x >> b8);
-  uvec2 b4 = mix(uvec2(4u), uvec2(0u), bvec2((x & uvec2(15u))));
-  x = (x >> b4);
-  uvec2 b2 = mix(uvec2(2u), uvec2(0u), bvec2((x & uvec2(3u))));
-  x = (x >> b2);
-  uvec2 b1 = mix(uvec2(1u), uvec2(0u), bvec2((x & uvec2(1u))));
-  uvec2 is_zero = mix(uvec2(0u), uvec2(4294967295u), equal(x, uvec2(0u)));
-  return uvec2((((((b16 | b8) | b4) | b2) | b1) | is_zero));
-}
-
 void firstTrailingBit_45eb10() {
-  uvec2 res = tint_first_trailing_bit(uvec2(1u));
+  uvec2 res = uvec2(0u);
 }
 
 void compute_main() {

test/tint/builtins/gen/literal/firstTrailingBit/45eb10.wgsl.expected.msl

@@ -1,23 +1,8 @@
 #include <metal_stdlib>
 
 using namespace metal;
-uint2 tint_first_trailing_bit(uint2 v) {
-  uint2 x = uint2(v);
-  uint2 const b16 = select(uint2(16u), uint2(0u), bool2((x & uint2(65535u))));
-  x = (x >> b16);
-  uint2 const b8 = select(uint2(8u), uint2(0u), bool2((x & uint2(255u))));
-  x = (x >> b8);
-  uint2 const b4 = select(uint2(4u), uint2(0u), bool2((x & uint2(15u))));
-  x = (x >> b4);
-  uint2 const b2 = select(uint2(2u), uint2(0u), bool2((x & uint2(3u))));
-  x = (x >> b2);
-  uint2 const b1 = select(uint2(1u), uint2(0u), bool2((x & uint2(1u))));
-  uint2 const is_zero = select(uint2(0u), uint2(4294967295u), (x == uint2(0u)));
-  return uint2((((((b16 | b8) | b4) | b2) | b1) | is_zero));
-}
-
 void firstTrailingBit_45eb10() {
-  uint2 res = tint_first_trailing_bit(uint2(1u));
+  uint2 res = uint2(0u);
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/firstTrailingBit/45eb10.wgsl.expected.spvasm

@@ -1,7 +1,7 @@
 ; SPIR-V
 ; Version: 1.3
 ; Generator: Google Tint Compiler; 0
-; Bound: 98
+; Bound: 32
 ; Schema: 0
                OpCapability Shader
                OpMemoryModel Logical GLSL450
@@ -12,9 +12,6 @@
                OpExecutionMode %compute_main LocalSize 1 1 1
                OpName %value "value"
                OpName %vertex_point_size "vertex_point_size"
-               OpName %tint_first_trailing_bit "tint_first_trailing_bit"
-               OpName %v "v"
-               OpName %x "x"
                OpName %firstTrailingBit_45eb10 "firstTrailingBit_45eb10"
                OpName %res "res"
                OpName %vertex_main_inner "vertex_main_inner"
@@ -31,110 +28,39 @@
 %_ptr_Output_float = OpTypePointer Output %float
           %8 = OpConstantNull %float
 %vertex_point_size = OpVariable %_ptr_Output_float Output %8
+       %void = OpTypeVoid
+          %9 = OpTypeFunction %void
        %uint = OpTypeInt 32 0
      %v2uint = OpTypeVector %uint 2
-          %9 = OpTypeFunction %v2uint %v2uint
+         %15 = OpConstantNull %v2uint
 %_ptr_Function_v2uint = OpTypePointer Function %v2uint
-         %18 = OpConstantNull %v2uint
+         %18 = OpTypeFunction %v4float
-       %bool = OpTypeBool
-     %v2bool = OpTypeVector %bool 2
- %uint_65535 = OpConstant %uint 65535
-         %25 = OpConstantComposite %v2uint %uint_65535 %uint_65535
-    %uint_16 = OpConstant %uint 16
-         %28 = OpConstantComposite %v2uint %uint_16 %uint_16
-   %uint_255 = OpConstant %uint 255
-         %35 = OpConstantComposite %v2uint %uint_255 %uint_255
-     %uint_8 = OpConstant %uint 8
-         %38 = OpConstantComposite %v2uint %uint_8 %uint_8
-    %uint_15 = OpConstant %uint 15
-         %45 = OpConstantComposite %v2uint %uint_15 %uint_15
-     %uint_4 = OpConstant %uint 4
-         %48 = OpConstantComposite %v2uint %uint_4 %uint_4
-     %uint_3 = OpConstant %uint 3
-         %55 = OpConstantComposite %v2uint %uint_3 %uint_3
-     %uint_2 = OpConstant %uint 2
-         %58 = OpConstantComposite %v2uint %uint_2 %uint_2
-     %uint_1 = OpConstant %uint 1
-         %65 = OpConstantComposite %v2uint %uint_1 %uint_1
-%uint_4294967295 = OpConstant %uint 4294967295
-         %71 = OpConstantComposite %v2uint %uint_4294967295 %uint_4294967295
-       %void = OpTypeVoid
-         %78 = OpTypeFunction %void
-         %84 = OpTypeFunction %v4float
     %float_1 = OpConstant %float 1
-%tint_first_trailing_bit = OpFunction %v2uint None %9
+%firstTrailingBit_45eb10 = OpFunction %void None %9
-          %v = OpFunctionParameter %v2uint
+         %12 = OpLabel
-         %14 = OpLabel
+        %res = OpVariable %_ptr_Function_v2uint Function %15
-          %x = OpVariable %_ptr_Function_v2uint Function %18
+               OpStore %res %15
-               OpStore %x %v
-         %23 = OpLoad %v2uint %x
-         %26 = OpBitwiseAnd %v2uint %23 %25
-         %20 = OpINotEqual %v2bool %26 %18
-         %19 = OpSelect %v2uint %20 %18 %28
-         %29 = OpLoad %v2uint %x
-         %30 = OpShiftRightLogical %v2uint %29 %19
-               OpStore %x %30
-         %33 = OpLoad %v2uint %x
-         %36 = OpBitwiseAnd %v2uint %33 %35
-         %32 = OpINotEqual %v2bool %36 %18
-         %31 = OpSelect %v2uint %32 %18 %38
-         %39 = OpLoad %v2uint %x
-         %40 = OpShiftRightLogical %v2uint %39 %31
-               OpStore %x %40
-         %43 = OpLoad %v2uint %x
-         %46 = OpBitwiseAnd %v2uint %43 %45
-         %42 = OpINotEqual %v2bool %46 %18
-         %41 = OpSelect %v2uint %42 %18 %48
-         %49 = OpLoad %v2uint %x
-         %50 = OpShiftRightLogical %v2uint %49 %41
-               OpStore %x %50
-         %53 = OpLoad %v2uint %x
-         %56 = OpBitwiseAnd %v2uint %53 %55
-         %52 = OpINotEqual %v2bool %56 %18
-         %51 = OpSelect %v2uint %52 %18 %58
-         %59 = OpLoad %v2uint %x
-         %60 = OpShiftRightLogical %v2uint %59 %51
-               OpStore %x %60
-         %63 = OpLoad %v2uint %x
-         %66 = OpBitwiseAnd %v2uint %63 %65
-         %62 = OpINotEqual %v2bool %66 %18
-         %61 = OpSelect %v2uint %62 %18 %65
-         %68 = OpLoad %v2uint %x
-         %69 = OpIEqual %v2bool %68 %18
-         %67 = OpSelect %v2uint %69 %71 %18
-         %73 = OpBitwiseOr %v2uint %19 %31
-         %74 = OpBitwiseOr %v2uint %73 %41
-         %75 = OpBitwiseOr %v2uint %74 %51
-         %76 = OpBitwiseOr %v2uint %75 %61
-         %77 = OpBitwiseOr %v2uint %76 %67
-               OpReturnValue %77
-               OpFunctionEnd
-%firstTrailingBit_45eb10 = OpFunction %void None %78
-         %81 = OpLabel
-        %res = OpVariable %_ptr_Function_v2uint Function %18
-         %82 = OpFunctionCall %v2uint %tint_first_trailing_bit %65
-               OpStore %res %82
                OpReturn
                OpFunctionEnd
-%vertex_main_inner = OpFunction %v4float None %84
+%vertex_main_inner = OpFunction %v4float None %18
-         %86 = OpLabel
+         %20 = OpLabel
-         %87 = OpFunctionCall %void %firstTrailingBit_45eb10
+         %21 = OpFunctionCall %void %firstTrailingBit_45eb10
                OpReturnValue %5
                OpFunctionEnd
-%vertex_main = OpFunction %void None %78
+%vertex_main = OpFunction %void None %9
-         %89 = OpLabel
+         %23 = OpLabel
-         %90 = OpFunctionCall %v4float %vertex_main_inner
+         %24 = OpFunctionCall %v4float %vertex_main_inner
-               OpStore %value %90
+               OpStore %value %24
                OpStore %vertex_point_size %float_1
                OpReturn
                OpFunctionEnd
-%fragment_main = OpFunction %void None %78
+%fragment_main = OpFunction %void None %9
-         %93 = OpLabel
+         %27 = OpLabel
-         %94 = OpFunctionCall %void %firstTrailingBit_45eb10
+         %28 = OpFunctionCall %void %firstTrailingBit_45eb10
                OpReturn
                OpFunctionEnd
-%compute_main = OpFunction %void None %78
+%compute_main = OpFunction %void None %9
-         %96 = OpLabel
+         %30 = OpLabel
-         %97 = OpFunctionCall %void %firstTrailingBit_45eb10
+         %31 = OpFunctionCall %void %firstTrailingBit_45eb10
                OpReturn
                OpFunctionEnd

test/tint/builtins/gen/literal/firstTrailingBit/47d475.wgsl.expected.dxc.hlsl

@@ -1,20 +1,5 @@
-uint tint_first_trailing_bit(uint v) {
-  uint x = uint(v);
-  const uint b16 = (bool((x & 65535u)) ? 0u : 16u);
-  x = (x >> b16);
-  const uint b8 = (bool((x & 255u)) ? 0u : 8u);
-  x = (x >> b8);
-  const uint b4 = (bool((x & 15u)) ? 0u : 4u);
-  x = (x >> b4);
-  const uint b2 = (bool((x & 3u)) ? 0u : 2u);
-  x = (x >> b2);
-  const uint b1 = (bool((x & 1u)) ? 0u : 1u);
-  const uint is_zero = ((x == 0u) ? 4294967295u : 0u);
-  return uint((((((b16 | b8) | b4) | b2) | b1) | is_zero));
-}
-
 void firstTrailingBit_47d475() {
-  uint res = tint_first_trailing_bit(1u);
+  uint res = 0u;
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/firstTrailingBit/47d475.wgsl.expected.fxc.hlsl

@@ -1,20 +1,5 @@
-uint tint_first_trailing_bit(uint v) {
-  uint x = uint(v);
-  const uint b16 = (bool((x & 65535u)) ? 0u : 16u);
-  x = (x >> b16);
-  const uint b8 = (bool((x & 255u)) ? 0u : 8u);
-  x = (x >> b8);
-  const uint b4 = (bool((x & 15u)) ? 0u : 4u);
-  x = (x >> b4);
-  const uint b2 = (bool((x & 3u)) ? 0u : 2u);
-  x = (x >> b2);
-  const uint b1 = (bool((x & 1u)) ? 0u : 1u);
-  const uint is_zero = ((x == 0u) ? 4294967295u : 0u);
-  return uint((((((b16 | b8) | b4) | b2) | b1) | is_zero));
-}
-
 void firstTrailingBit_47d475() {
-  uint res = tint_first_trailing_bit(1u);
+  uint res = 0u;
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/firstTrailingBit/47d475.wgsl.expected.glsl

@@ -1,22 +1,7 @@
 #version 310 es
 
-uint tint_first_trailing_bit(uint v) {
-  uint x = uint(v);
-  uint b16 = (bool((x & 65535u)) ? 0u : 16u);
-  x = (x >> b16);
-  uint b8 = (bool((x & 255u)) ? 0u : 8u);
-  x = (x >> b8);
-  uint b4 = (bool((x & 15u)) ? 0u : 4u);
-  x = (x >> b4);
-  uint b2 = (bool((x & 3u)) ? 0u : 2u);
-  x = (x >> b2);
-  uint b1 = (bool((x & 1u)) ? 0u : 1u);
-  uint is_zero = ((x == 0u) ? 4294967295u : 0u);
-  return uint((((((b16 | b8) | b4) | b2) | b1) | is_zero));
-}
-
 void firstTrailingBit_47d475() {
-  uint res = tint_first_trailing_bit(1u);
+  uint res = 0u;
 }
 
 vec4 vertex_main() {
@@ -35,23 +20,8 @@ void main() {
 #version 310 es
 precision mediump float;
 
-uint tint_first_trailing_bit(uint v) {
-  uint x = uint(v);
-  uint b16 = (bool((x & 65535u)) ? 0u : 16u);
-  x = (x >> b16);
-  uint b8 = (bool((x & 255u)) ? 0u : 8u);
-  x = (x >> b8);
-  uint b4 = (bool((x & 15u)) ? 0u : 4u);
-  x = (x >> b4);
-  uint b2 = (bool((x & 3u)) ? 0u : 2u);
-  x = (x >> b2);
-  uint b1 = (bool((x & 1u)) ? 0u : 1u);
-  uint is_zero = ((x == 0u) ? 4294967295u : 0u);
-  return uint((((((b16 | b8) | b4) | b2) | b1) | is_zero));
-}
-
 void firstTrailingBit_47d475() {
-  uint res = tint_first_trailing_bit(1u);
+  uint res = 0u;
 }
 
 void fragment_main() {
@@ -64,23 +34,8 @@ void main() {
 }
 #version 310 es
 
-uint tint_first_trailing_bit(uint v) {
-  uint x = uint(v);
-  uint b16 = (bool((x & 65535u)) ? 0u : 16u);
-  x = (x >> b16);
-  uint b8 = (bool((x & 255u)) ? 0u : 8u);
-  x = (x >> b8);
-  uint b4 = (bool((x & 15u)) ? 0u : 4u);
-  x = (x >> b4);
-  uint b2 = (bool((x & 3u)) ? 0u : 2u);
-  x = (x >> b2);
-  uint b1 = (bool((x & 1u)) ? 0u : 1u);
-  uint is_zero = ((x == 0u) ? 4294967295u : 0u);
-  return uint((((((b16 | b8) | b4) | b2) | b1) | is_zero));
-}
-
 void firstTrailingBit_47d475() {
-  uint res = tint_first_trailing_bit(1u);
+  uint res = 0u;
 }
 
 void compute_main() {

test/tint/builtins/gen/literal/firstTrailingBit/47d475.wgsl.expected.msl

@@ -1,23 +1,8 @@
 #include <metal_stdlib>
 
 using namespace metal;
-uint tint_first_trailing_bit(uint v) {
-  uint x = uint(v);
-  uint const b16 = select(16u, 0u, bool((x & 65535u)));
-  x = (x >> b16);
-  uint const b8 = select(8u, 0u, bool((x & 255u)));
-  x = (x >> b8);
-  uint const b4 = select(4u, 0u, bool((x & 15u)));
-  x = (x >> b4);
-  uint const b2 = select(2u, 0u, bool((x & 3u)));
-  x = (x >> b2);
-  uint const b1 = select(1u, 0u, bool((x & 1u)));
-  uint const is_zero = select(0u, 4294967295u, (x == 0u));
-  return uint((((((b16 | b8) | b4) | b2) | b1) | is_zero));
-}
-
 void firstTrailingBit_47d475() {
-  uint res = tint_first_trailing_bit(1u);
+  uint res = 0u;
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/firstTrailingBit/47d475.wgsl.expected.spvasm

@@ -1,7 +1,7 @@
 ; SPIR-V
 ; Version: 1.3
 ; Generator: Google Tint Compiler; 0
-; Bound: 86
+; Bound: 31
 ; Schema: 0
                OpCapability Shader
                OpMemoryModel Logical GLSL450
@@ -12,9 +12,6 @@
                OpExecutionMode %compute_main LocalSize 1 1 1
                OpName %value "value"
                OpName %vertex_point_size "vertex_point_size"
-               OpName %tint_first_trailing_bit "tint_first_trailing_bit"
-               OpName %v "v"
-               OpName %x "x"
                OpName %firstTrailingBit_47d475 "firstTrailingBit_47d475"
                OpName %res "res"
                OpName %vertex_main_inner "vertex_main_inner"
@@ -31,98 +28,38 @@
 %_ptr_Output_float = OpTypePointer Output %float
           %8 = OpConstantNull %float
 %vertex_point_size = OpVariable %_ptr_Output_float Output %8
-       %uint = OpTypeInt 32 0
-          %9 = OpTypeFunction %uint %uint
-%_ptr_Function_uint = OpTypePointer Function %uint
-         %17 = OpConstantNull %uint
-       %bool = OpTypeBool
- %uint_65535 = OpConstant %uint 65535
-    %uint_16 = OpConstant %uint 16
-   %uint_255 = OpConstant %uint 255
-     %uint_8 = OpConstant %uint 8
-    %uint_15 = OpConstant %uint 15
-     %uint_4 = OpConstant %uint 4
-     %uint_3 = OpConstant %uint 3
-     %uint_2 = OpConstant %uint 2
-     %uint_1 = OpConstant %uint 1
-%uint_4294967295 = OpConstant %uint 4294967295
        %void = OpTypeVoid
-         %66 = OpTypeFunction %void
+          %9 = OpTypeFunction %void
-         %72 = OpTypeFunction %v4float
+       %uint = OpTypeInt 32 0
+         %14 = OpConstantNull %uint
+%_ptr_Function_uint = OpTypePointer Function %uint
+         %17 = OpTypeFunction %v4float
     %float_1 = OpConstant %float 1
-%tint_first_trailing_bit = OpFunction %uint None %9
+%firstTrailingBit_47d475 = OpFunction %void None %9
-          %v = OpFunctionParameter %uint
+         %12 = OpLabel
-         %13 = OpLabel
+        %res = OpVariable %_ptr_Function_uint Function %14
-          %x = OpVariable %_ptr_Function_uint Function %17
+               OpStore %res %14
-               OpStore %x %v
-         %21 = OpLoad %uint %x
-         %23 = OpBitwiseAnd %uint %21 %uint_65535
-         %19 = OpINotEqual %bool %23 %17
-         %18 = OpSelect %uint %19 %17 %uint_16
-         %25 = OpLoad %uint %x
-         %26 = OpShiftRightLogical %uint %25 %18
-               OpStore %x %26
-         %29 = OpLoad %uint %x
-         %31 = OpBitwiseAnd %uint %29 %uint_255
-         %28 = OpINotEqual %bool %31 %17
-         %27 = OpSelect %uint %28 %17 %uint_8
-         %33 = OpLoad %uint %x
-         %34 = OpShiftRightLogical %uint %33 %27
-               OpStore %x %34
-         %37 = OpLoad %uint %x
-         %39 = OpBitwiseAnd %uint %37 %uint_15
-         %36 = OpINotEqual %bool %39 %17
-         %35 = OpSelect %uint %36 %17 %uint_4
-         %41 = OpLoad %uint %x
-         %42 = OpShiftRightLogical %uint %41 %35
-               OpStore %x %42
-         %45 = OpLoad %uint %x
-         %47 = OpBitwiseAnd %uint %45 %uint_3
-         %44 = OpINotEqual %bool %47 %17
-         %43 = OpSelect %uint %44 %17 %uint_2
-         %49 = OpLoad %uint %x
-         %50 = OpShiftRightLogical %uint %49 %43
-               OpStore %x %50
-         %53 = OpLoad %uint %x
-         %55 = OpBitwiseAnd %uint %53 %uint_1
-         %52 = OpINotEqual %bool %55 %17
-         %51 = OpSelect %uint %52 %17 %uint_1
-         %57 = OpLoad %uint %x
-         %58 = OpIEqual %bool %57 %17
-         %56 = OpSelect %uint %58 %uint_4294967295 %17
-         %61 = OpBitwiseOr %uint %18 %27
-         %62 = OpBitwiseOr %uint %61 %35
-         %63 = OpBitwiseOr %uint %62 %43
-         %64 = OpBitwiseOr %uint %63 %51
-         %65 = OpBitwiseOr %uint %64 %56
-               OpReturnValue %65
-               OpFunctionEnd
-%firstTrailingBit_47d475 = OpFunction %void None %66
-         %69 = OpLabel
-        %res = OpVariable %_ptr_Function_uint Function %17
-         %70 = OpFunctionCall %uint %tint_first_trailing_bit %uint_1
-               OpStore %res %70
                OpReturn
                OpFunctionEnd
-%vertex_main_inner = OpFunction %v4float None %72
+%vertex_main_inner = OpFunction %v4float None %17
-         %74 = OpLabel
+         %19 = OpLabel
-         %75 = OpFunctionCall %void %firstTrailingBit_47d475
+         %20 = OpFunctionCall %void %firstTrailingBit_47d475
                OpReturnValue %5
                OpFunctionEnd
-%vertex_main = OpFunction %void None %66
+%vertex_main = OpFunction %void None %9
-         %77 = OpLabel
+         %22 = OpLabel
-         %78 = OpFunctionCall %v4float %vertex_main_inner
+         %23 = OpFunctionCall %v4float %vertex_main_inner
-               OpStore %value %78
+               OpStore %value %23
                OpStore %vertex_point_size %float_1
                OpReturn
                OpFunctionEnd
-%fragment_main = OpFunction %void None %66
+%fragment_main = OpFunction %void None %9
-         %81 = OpLabel
+         %26 = OpLabel
-         %82 = OpFunctionCall %void %firstTrailingBit_47d475
+         %27 = OpFunctionCall %void %firstTrailingBit_47d475
                OpReturn
                OpFunctionEnd
-%compute_main = OpFunction %void None %66
+%compute_main = OpFunction %void None %9
-         %84 = OpLabel
+         %29 = OpLabel
-         %85 = OpFunctionCall %void %firstTrailingBit_47d475
+         %30 = OpFunctionCall %void %firstTrailingBit_47d475
                OpReturn
                OpFunctionEnd

test/tint/builtins/gen/literal/firstTrailingBit/50c072.wgsl.expected.dxc.hlsl

@@ -1,20 +1,5 @@
-int2 tint_first_trailing_bit(int2 v) {
-  uint2 x = uint2(v);
-  const uint2 b16 = (bool2((x & (65535u).xx)) ? (0u).xx : (16u).xx);
-  x = (x >> b16);
-  const uint2 b8 = (bool2((x & (255u).xx)) ? (0u).xx : (8u).xx);
-  x = (x >> b8);
-  const uint2 b4 = (bool2((x & (15u).xx)) ? (0u).xx : (4u).xx);
-  x = (x >> b4);
-  const uint2 b2 = (bool2((x & (3u).xx)) ? (0u).xx : (2u).xx);
-  x = (x >> b2);
-  const uint2 b1 = (bool2((x & (1u).xx)) ? (0u).xx : (1u).xx);
-  const uint2 is_zero = ((x == (0u).xx) ? (4294967295u).xx : (0u).xx);
-  return int2((((((b16 | b8) | b4) | b2) | b1) | is_zero));
-}
-
 void firstTrailingBit_50c072() {
-  int2 res = tint_first_trailing_bit((1).xx);
+  int2 res = (0).xx;
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/firstTrailingBit/50c072.wgsl.expected.fxc.hlsl

@@ -1,20 +1,5 @@
-int2 tint_first_trailing_bit(int2 v) {
-  uint2 x = uint2(v);
-  const uint2 b16 = (bool2((x & (65535u).xx)) ? (0u).xx : (16u).xx);
-  x = (x >> b16);
-  const uint2 b8 = (bool2((x & (255u).xx)) ? (0u).xx : (8u).xx);
-  x = (x >> b8);
-  const uint2 b4 = (bool2((x & (15u).xx)) ? (0u).xx : (4u).xx);
-  x = (x >> b4);
-  const uint2 b2 = (bool2((x & (3u).xx)) ? (0u).xx : (2u).xx);
-  x = (x >> b2);
-  const uint2 b1 = (bool2((x & (1u).xx)) ? (0u).xx : (1u).xx);
-  const uint2 is_zero = ((x == (0u).xx) ? (4294967295u).xx : (0u).xx);
-  return int2((((((b16 | b8) | b4) | b2) | b1) | is_zero));
-}
-
 void firstTrailingBit_50c072() {
-  int2 res = tint_first_trailing_bit((1).xx);
+  int2 res = (0).xx;
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/firstTrailingBit/50c072.wgsl.expected.glsl

@@ -1,22 +1,7 @@
 #version 310 es
 
-ivec2 tint_first_trailing_bit(ivec2 v) {
-  uvec2 x = uvec2(v);
-  uvec2 b16 = mix(uvec2(16u), uvec2(0u), bvec2((x & uvec2(65535u))));
-  x = (x >> b16);
-  uvec2 b8 = mix(uvec2(8u), uvec2(0u), bvec2((x & uvec2(255u))));
-  x = (x >> b8);
-  uvec2 b4 = mix(uvec2(4u), uvec2(0u), bvec2((x & uvec2(15u))));
-  x = (x >> b4);
-  uvec2 b2 = mix(uvec2(2u), uvec2(0u), bvec2((x & uvec2(3u))));
-  x = (x >> b2);
-  uvec2 b1 = mix(uvec2(1u), uvec2(0u), bvec2((x & uvec2(1u))));
-  uvec2 is_zero = mix(uvec2(0u), uvec2(4294967295u), equal(x, uvec2(0u)));
-  return ivec2((((((b16 | b8) | b4) | b2) | b1) | is_zero));
-}
-
 void firstTrailingBit_50c072() {
-  ivec2 res = tint_first_trailing_bit(ivec2(1));
+  ivec2 res = ivec2(0);
 }
 
 vec4 vertex_main() {
@@ -35,23 +20,8 @@ void main() {
 #version 310 es
 precision mediump float;
 
-ivec2 tint_first_trailing_bit(ivec2 v) {
-  uvec2 x = uvec2(v);
-  uvec2 b16 = mix(uvec2(16u), uvec2(0u), bvec2((x & uvec2(65535u))));
-  x = (x >> b16);
-  uvec2 b8 = mix(uvec2(8u), uvec2(0u), bvec2((x & uvec2(255u))));
-  x = (x >> b8);
-  uvec2 b4 = mix(uvec2(4u), uvec2(0u), bvec2((x & uvec2(15u))));
-  x = (x >> b4);
-  uvec2 b2 = mix(uvec2(2u), uvec2(0u), bvec2((x & uvec2(3u))));
-  x = (x >> b2);
-  uvec2 b1 = mix(uvec2(1u), uvec2(0u), bvec2((x & uvec2(1u))));
-  uvec2 is_zero = mix(uvec2(0u), uvec2(4294967295u), equal(x, uvec2(0u)));
-  return ivec2((((((b16 | b8) | b4) | b2) | b1) | is_zero));
-}
-
 void firstTrailingBit_50c072() {
-  ivec2 res = tint_first_trailing_bit(ivec2(1));
+  ivec2 res = ivec2(0);
 }
 
 void fragment_main() {
@@ -64,23 +34,8 @@ void main() {
 }
 #version 310 es
 
-ivec2 tint_first_trailing_bit(ivec2 v) {
-  uvec2 x = uvec2(v);
-  uvec2 b16 = mix(uvec2(16u), uvec2(0u), bvec2((x & uvec2(65535u))));
-  x = (x >> b16);
-  uvec2 b8 = mix(uvec2(8u), uvec2(0u), bvec2((x & uvec2(255u))));
-  x = (x >> b8);
-  uvec2 b4 = mix(uvec2(4u), uvec2(0u), bvec2((x & uvec2(15u))));
-  x = (x >> b4);
-  uvec2 b2 = mix(uvec2(2u), uvec2(0u), bvec2((x & uvec2(3u))));
-  x = (x >> b2);
-  uvec2 b1 = mix(uvec2(1u), uvec2(0u), bvec2((x & uvec2(1u))));
-  uvec2 is_zero = mix(uvec2(0u), uvec2(4294967295u), equal(x, uvec2(0u)));
-  return ivec2((((((b16 | b8) | b4) | b2) | b1) | is_zero));
-}
-
 void firstTrailingBit_50c072() {
-  ivec2 res = tint_first_trailing_bit(ivec2(1));
+  ivec2 res = ivec2(0);
 }
 
 void compute_main() {

test/tint/builtins/gen/literal/firstTrailingBit/50c072.wgsl.expected.msl

@@ -1,23 +1,8 @@
 #include <metal_stdlib>
 
 using namespace metal;
-int2 tint_first_trailing_bit(int2 v) {
-  uint2 x = uint2(v);
-  uint2 const b16 = select(uint2(16u), uint2(0u), bool2((x & uint2(65535u))));
-  x = (x >> b16);
-  uint2 const b8 = select(uint2(8u), uint2(0u), bool2((x & uint2(255u))));
-  x = (x >> b8);
-  uint2 const b4 = select(uint2(4u), uint2(0u), bool2((x & uint2(15u))));
-  x = (x >> b4);
-  uint2 const b2 = select(uint2(2u), uint2(0u), bool2((x & uint2(3u))));
-  x = (x >> b2);
-  uint2 const b1 = select(uint2(1u), uint2(0u), bool2((x & uint2(1u))));
-  uint2 const is_zero = select(uint2(0u), uint2(4294967295u), (x == uint2(0u)));
-  return int2((((((b16 | b8) | b4) | b2) | b1) | is_zero));
-}
-
 void firstTrailingBit_50c072() {
-  int2 res = tint_first_trailing_bit(int2(1));
+  int2 res = int2(0);
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/firstTrailingBit/50c072.wgsl.expected.spvasm

@@ -1,7 +1,7 @@
 ; SPIR-V
 ; Version: 1.3
 ; Generator: Google Tint Compiler; 0
-; Bound: 104
+; Bound: 32
 ; Schema: 0
                OpCapability Shader
                OpMemoryModel Logical GLSL450
@@ -12,9 +12,6 @@
                OpExecutionMode %compute_main LocalSize 1 1 1
                OpName %value "value"
                OpName %vertex_point_size "vertex_point_size"
-               OpName %tint_first_trailing_bit "tint_first_trailing_bit"
-               OpName %v "v"
-               OpName %x "x"
                OpName %firstTrailingBit_50c072 "firstTrailingBit_50c072"
                OpName %res "res"
                OpName %vertex_main_inner "vertex_main_inner"
@@ -31,118 +28,39 @@
 %_ptr_Output_float = OpTypePointer Output %float
           %8 = OpConstantNull %float
 %vertex_point_size = OpVariable %_ptr_Output_float Output %8
+       %void = OpTypeVoid
+          %9 = OpTypeFunction %void
         %int = OpTypeInt 32 1
       %v2int = OpTypeVector %int 2
-          %9 = OpTypeFunction %v2int %v2int
+         %15 = OpConstantNull %v2int
-       %uint = OpTypeInt 32 0
-     %v2uint = OpTypeVector %uint 2
-%_ptr_Function_v2uint = OpTypePointer Function %v2uint
-         %20 = OpConstantNull %v2uint
-       %bool = OpTypeBool
-     %v2bool = OpTypeVector %bool 2
- %uint_65535 = OpConstant %uint 65535
-         %27 = OpConstantComposite %v2uint %uint_65535 %uint_65535
-    %uint_16 = OpConstant %uint 16
-         %30 = OpConstantComposite %v2uint %uint_16 %uint_16
-   %uint_255 = OpConstant %uint 255
-         %37 = OpConstantComposite %v2uint %uint_255 %uint_255
-     %uint_8 = OpConstant %uint 8
-         %40 = OpConstantComposite %v2uint %uint_8 %uint_8
-    %uint_15 = OpConstant %uint 15
-         %47 = OpConstantComposite %v2uint %uint_15 %uint_15
-     %uint_4 = OpConstant %uint 4
-         %50 = OpConstantComposite %v2uint %uint_4 %uint_4
-     %uint_3 = OpConstant %uint 3
-         %57 = OpConstantComposite %v2uint %uint_3 %uint_3
-     %uint_2 = OpConstant %uint 2
-         %60 = OpConstantComposite %v2uint %uint_2 %uint_2
-     %uint_1 = OpConstant %uint 1
-         %67 = OpConstantComposite %v2uint %uint_1 %uint_1
-%uint_4294967295 = OpConstant %uint 4294967295
-         %73 = OpConstantComposite %v2uint %uint_4294967295 %uint_4294967295
-       %void = OpTypeVoid
-         %80 = OpTypeFunction %void
-      %int_1 = OpConstant %int 1
-         %86 = OpConstantComposite %v2int %int_1 %int_1
 %_ptr_Function_v2int = OpTypePointer Function %v2int
-         %89 = OpConstantNull %v2int
+         %18 = OpTypeFunction %v4float
-         %90 = OpTypeFunction %v4float
     %float_1 = OpConstant %float 1
-%tint_first_trailing_bit = OpFunction %v2int None %9
+%firstTrailingBit_50c072 = OpFunction %void None %9
-          %v = OpFunctionParameter %v2int
+         %12 = OpLabel
-         %14 = OpLabel
+        %res = OpVariable %_ptr_Function_v2int Function %15
-          %x = OpVariable %_ptr_Function_v2uint Function %20
+               OpStore %res %15
-         %15 = OpBitcast %v2uint %v
-               OpStore %x %15
-         %25 = OpLoad %v2uint %x
-         %28 = OpBitwiseAnd %v2uint %25 %27
-         %22 = OpINotEqual %v2bool %28 %20
-         %21 = OpSelect %v2uint %22 %20 %30
-         %31 = OpLoad %v2uint %x
-         %32 = OpShiftRightLogical %v2uint %31 %21
-               OpStore %x %32
-         %35 = OpLoad %v2uint %x
-         %38 = OpBitwiseAnd %v2uint %35 %37
-         %34 = OpINotEqual %v2bool %38 %20
-         %33 = OpSelect %v2uint %34 %20 %40
-         %41 = OpLoad %v2uint %x
-         %42 = OpShiftRightLogical %v2uint %41 %33
-               OpStore %x %42
-         %45 = OpLoad %v2uint %x
-         %48 = OpBitwiseAnd %v2uint %45 %47
-         %44 = OpINotEqual %v2bool %48 %20
-         %43 = OpSelect %v2uint %44 %20 %50
-         %51 = OpLoad %v2uint %x
-         %52 = OpShiftRightLogical %v2uint %51 %43
-               OpStore %x %52
-         %55 = OpLoad %v2uint %x
-         %58 = OpBitwiseAnd %v2uint %55 %57
-         %54 = OpINotEqual %v2bool %58 %20
-         %53 = OpSelect %v2uint %54 %20 %60
-         %61 = OpLoad %v2uint %x
-         %62 = OpShiftRightLogical %v2uint %61 %53
-               OpStore %x %62
-         %65 = OpLoad %v2uint %x
-         %68 = OpBitwiseAnd %v2uint %65 %67
-         %64 = OpINotEqual %v2bool %68 %20
-         %63 = OpSelect %v2uint %64 %20 %67
-         %70 = OpLoad %v2uint %x
-         %71 = OpIEqual %v2bool %70 %20
-         %69 = OpSelect %v2uint %71 %73 %20
-         %75 = OpBitwiseOr %v2uint %21 %33
-         %76 = OpBitwiseOr %v2uint %75 %43
-         %77 = OpBitwiseOr %v2uint %76 %53
-         %78 = OpBitwiseOr %v2uint %77 %63
-         %79 = OpBitwiseOr %v2uint %78 %69
-         %74 = OpBitcast %v2int %79
-               OpReturnValue %74
-               OpFunctionEnd
-%firstTrailingBit_50c072 = OpFunction %void None %80
-         %83 = OpLabel
-        %res = OpVariable %_ptr_Function_v2int Function %89
-         %84 = OpFunctionCall %v2int %tint_first_trailing_bit %86
-               OpStore %res %84
                OpReturn
                OpFunctionEnd
-%vertex_main_inner = OpFunction %v4float None %90
+%vertex_main_inner = OpFunction %v4float None %18
-         %92 = OpLabel
+         %20 = OpLabel
-         %93 = OpFunctionCall %void %firstTrailingBit_50c072
+         %21 = OpFunctionCall %void %firstTrailingBit_50c072
                OpReturnValue %5
                OpFunctionEnd
-%vertex_main = OpFunction %void None %80
+%vertex_main = OpFunction %void None %9
-         %95 = OpLabel
+         %23 = OpLabel
-         %96 = OpFunctionCall %v4float %vertex_main_inner
+         %24 = OpFunctionCall %v4float %vertex_main_inner
-               OpStore %value %96
+               OpStore %value %24
                OpStore %vertex_point_size %float_1
                OpReturn
                OpFunctionEnd
-%fragment_main = OpFunction %void None %80
+%fragment_main = OpFunction %void None %9
-         %99 = OpLabel
+         %27 = OpLabel
-        %100 = OpFunctionCall %void %firstTrailingBit_50c072
+         %28 = OpFunctionCall %void %firstTrailingBit_50c072
                OpReturn
                OpFunctionEnd
-%compute_main = OpFunction %void None %80
+%compute_main = OpFunction %void None %9
-        %102 = OpLabel
+         %30 = OpLabel
-        %103 = OpFunctionCall %void %firstTrailingBit_50c072
+         %31 = OpFunctionCall %void %firstTrailingBit_50c072
                OpReturn
                OpFunctionEnd

test/tint/builtins/gen/literal/firstTrailingBit/7496d6.wgsl.expected.dxc.hlsl

@@ -1,20 +1,5 @@
-int3 tint_first_trailing_bit(int3 v) {
-  uint3 x = uint3(v);
-  const uint3 b16 = (bool3((x & (65535u).xxx)) ? (0u).xxx : (16u).xxx);
-  x = (x >> b16);
-  const uint3 b8 = (bool3((x & (255u).xxx)) ? (0u).xxx : (8u).xxx);
-  x = (x >> b8);
-  const uint3 b4 = (bool3((x & (15u).xxx)) ? (0u).xxx : (4u).xxx);
-  x = (x >> b4);
-  const uint3 b2 = (bool3((x & (3u).xxx)) ? (0u).xxx : (2u).xxx);
-  x = (x >> b2);
-  const uint3 b1 = (bool3((x & (1u).xxx)) ? (0u).xxx : (1u).xxx);
-  const uint3 is_zero = ((x == (0u).xxx) ? (4294967295u).xxx : (0u).xxx);
-  return int3((((((b16 | b8) | b4) | b2) | b1) | is_zero));
-}
-
 void firstTrailingBit_7496d6() {
-  int3 res = tint_first_trailing_bit((1).xxx);
+  int3 res = (0).xxx;
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/firstTrailingBit/7496d6.wgsl.expected.fxc.hlsl

@@ -1,20 +1,5 @@
-int3 tint_first_trailing_bit(int3 v) {
-  uint3 x = uint3(v);
-  const uint3 b16 = (bool3((x & (65535u).xxx)) ? (0u).xxx : (16u).xxx);
-  x = (x >> b16);
-  const uint3 b8 = (bool3((x & (255u).xxx)) ? (0u).xxx : (8u).xxx);
-  x = (x >> b8);
-  const uint3 b4 = (bool3((x & (15u).xxx)) ? (0u).xxx : (4u).xxx);
-  x = (x >> b4);
-  const uint3 b2 = (bool3((x & (3u).xxx)) ? (0u).xxx : (2u).xxx);
-  x = (x >> b2);
-  const uint3 b1 = (bool3((x & (1u).xxx)) ? (0u).xxx : (1u).xxx);
-  const uint3 is_zero = ((x == (0u).xxx) ? (4294967295u).xxx : (0u).xxx);
-  return int3((((((b16 | b8) | b4) | b2) | b1) | is_zero));
-}
-
 void firstTrailingBit_7496d6() {
-  int3 res = tint_first_trailing_bit((1).xxx);
+  int3 res = (0).xxx;
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/firstTrailingBit/7496d6.wgsl.expected.glsl

@@ -1,22 +1,7 @@
 #version 310 es
 
-ivec3 tint_first_trailing_bit(ivec3 v) {
-  uvec3 x = uvec3(v);
-  uvec3 b16 = mix(uvec3(16u), uvec3(0u), bvec3((x & uvec3(65535u))));
-  x = (x >> b16);
-  uvec3 b8 = mix(uvec3(8u), uvec3(0u), bvec3((x & uvec3(255u))));
-  x = (x >> b8);
-  uvec3 b4 = mix(uvec3(4u), uvec3(0u), bvec3((x & uvec3(15u))));
-  x = (x >> b4);
-  uvec3 b2 = mix(uvec3(2u), uvec3(0u), bvec3((x & uvec3(3u))));
-  x = (x >> b2);
-  uvec3 b1 = mix(uvec3(1u), uvec3(0u), bvec3((x & uvec3(1u))));
-  uvec3 is_zero = mix(uvec3(0u), uvec3(4294967295u), equal(x, uvec3(0u)));
-  return ivec3((((((b16 | b8) | b4) | b2) | b1) | is_zero));
-}
-
 void firstTrailingBit_7496d6() {
-  ivec3 res = tint_first_trailing_bit(ivec3(1));
+  ivec3 res = ivec3(0);
 }
 
 vec4 vertex_main() {
@@ -35,23 +20,8 @@ void main() {
 #version 310 es
 precision mediump float;
 
-ivec3 tint_first_trailing_bit(ivec3 v) {
-  uvec3 x = uvec3(v);
-  uvec3 b16 = mix(uvec3(16u), uvec3(0u), bvec3((x & uvec3(65535u))));
-  x = (x >> b16);
-  uvec3 b8 = mix(uvec3(8u), uvec3(0u), bvec3((x & uvec3(255u))));
-  x = (x >> b8);
-  uvec3 b4 = mix(uvec3(4u), uvec3(0u), bvec3((x & uvec3(15u))));
-  x = (x >> b4);
-  uvec3 b2 = mix(uvec3(2u), uvec3(0u), bvec3((x & uvec3(3u))));
-  x = (x >> b2);
-  uvec3 b1 = mix(uvec3(1u), uvec3(0u), bvec3((x & uvec3(1u))));
-  uvec3 is_zero = mix(uvec3(0u), uvec3(4294967295u), equal(x, uvec3(0u)));
-  return ivec3((((((b16 | b8) | b4) | b2) | b1) | is_zero));
-}
-
 void firstTrailingBit_7496d6() {
-  ivec3 res = tint_first_trailing_bit(ivec3(1));
+  ivec3 res = ivec3(0);
 }
 
 void fragment_main() {
@@ -64,23 +34,8 @@ void main() {
 }
 #version 310 es
 
-ivec3 tint_first_trailing_bit(ivec3 v) {
-  uvec3 x = uvec3(v);
-  uvec3 b16 = mix(uvec3(16u), uvec3(0u), bvec3((x & uvec3(65535u))));
-  x = (x >> b16);
-  uvec3 b8 = mix(uvec3(8u), uvec3(0u), bvec3((x & uvec3(255u))));
-  x = (x >> b8);
-  uvec3 b4 = mix(uvec3(4u), uvec3(0u), bvec3((x & uvec3(15u))));
-  x = (x >> b4);
-  uvec3 b2 = mix(uvec3(2u), uvec3(0u), bvec3((x & uvec3(3u))));
-  x = (x >> b2);
-  uvec3 b1 = mix(uvec3(1u), uvec3(0u), bvec3((x & uvec3(1u))));
-  uvec3 is_zero = mix(uvec3(0u), uvec3(4294967295u), equal(x, uvec3(0u)));
-  return ivec3((((((b16 | b8) | b4) | b2) | b1) | is_zero));
-}
-
 void firstTrailingBit_7496d6() {
-  ivec3 res = tint_first_trailing_bit(ivec3(1));
+  ivec3 res = ivec3(0);
 }
 
 void compute_main() {

test/tint/builtins/gen/literal/firstTrailingBit/7496d6.wgsl.expected.msl

@@ -1,23 +1,8 @@
 #include <metal_stdlib>
 
 using namespace metal;
-int3 tint_first_trailing_bit(int3 v) {
-  uint3 x = uint3(v);
-  uint3 const b16 = select(uint3(16u), uint3(0u), bool3((x & uint3(65535u))));
-  x = (x >> b16);
-  uint3 const b8 = select(uint3(8u), uint3(0u), bool3((x & uint3(255u))));
-  x = (x >> b8);
-  uint3 const b4 = select(uint3(4u), uint3(0u), bool3((x & uint3(15u))));
-  x = (x >> b4);
-  uint3 const b2 = select(uint3(2u), uint3(0u), bool3((x & uint3(3u))));
-  x = (x >> b2);
-  uint3 const b1 = select(uint3(1u), uint3(0u), bool3((x & uint3(1u))));
-  uint3 const is_zero = select(uint3(0u), uint3(4294967295u), (x == uint3(0u)));
-  return int3((((((b16 | b8) | b4) | b2) | b1) | is_zero));
-}
-
 void firstTrailingBit_7496d6() {
-  int3 res = tint_first_trailing_bit(int3(1));
+  int3 res = int3(0);
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/firstTrailingBit/7496d6.wgsl.expected.spvasm

@@ -1,7 +1,7 @@
 ; SPIR-V
 ; Version: 1.3
 ; Generator: Google Tint Compiler; 0
-; Bound: 104
+; Bound: 32
 ; Schema: 0
                OpCapability Shader
                OpMemoryModel Logical GLSL450
@@ -12,9 +12,6 @@
                OpExecutionMode %compute_main LocalSize 1 1 1
                OpName %value "value"
                OpName %vertex_point_size "vertex_point_size"
-               OpName %tint_first_trailing_bit "tint_first_trailing_bit"
-               OpName %v "v"
-               OpName %x "x"
                OpName %firstTrailingBit_7496d6 "firstTrailingBit_7496d6"
                OpName %res "res"
                OpName %vertex_main_inner "vertex_main_inner"
@@ -31,118 +28,39 @@
 %_ptr_Output_float = OpTypePointer Output %float
           %8 = OpConstantNull %float
 %vertex_point_size = OpVariable %_ptr_Output_float Output %8
+       %void = OpTypeVoid
+          %9 = OpTypeFunction %void
         %int = OpTypeInt 32 1
       %v3int = OpTypeVector %int 3
-          %9 = OpTypeFunction %v3int %v3int
+         %15 = OpConstantNull %v3int
-       %uint = OpTypeInt 32 0
-     %v3uint = OpTypeVector %uint 3
-%_ptr_Function_v3uint = OpTypePointer Function %v3uint
-         %20 = OpConstantNull %v3uint
-       %bool = OpTypeBool
-     %v3bool = OpTypeVector %bool 3
- %uint_65535 = OpConstant %uint 65535
-         %27 = OpConstantComposite %v3uint %uint_65535 %uint_65535 %uint_65535
-    %uint_16 = OpConstant %uint 16
-         %30 = OpConstantComposite %v3uint %uint_16 %uint_16 %uint_16
-   %uint_255 = OpConstant %uint 255
-         %37 = OpConstantComposite %v3uint %uint_255 %uint_255 %uint_255
-     %uint_8 = OpConstant %uint 8
-         %40 = OpConstantComposite %v3uint %uint_8 %uint_8 %uint_8
-    %uint_15 = OpConstant %uint 15
-         %47 = OpConstantComposite %v3uint %uint_15 %uint_15 %uint_15
-     %uint_4 = OpConstant %uint 4
-         %50 = OpConstantComposite %v3uint %uint_4 %uint_4 %uint_4
-     %uint_3 = OpConstant %uint 3
-         %57 = OpConstantComposite %v3uint %uint_3 %uint_3 %uint_3
-     %uint_2 = OpConstant %uint 2
-         %60 = OpConstantComposite %v3uint %uint_2 %uint_2 %uint_2
-     %uint_1 = OpConstant %uint 1
-         %67 = OpConstantComposite %v3uint %uint_1 %uint_1 %uint_1
-%uint_4294967295 = OpConstant %uint 4294967295
-         %73 = OpConstantComposite %v3uint %uint_4294967295 %uint_4294967295 %uint_4294967295
-       %void = OpTypeVoid
-         %80 = OpTypeFunction %void
-      %int_1 = OpConstant %int 1
-         %86 = OpConstantComposite %v3int %int_1 %int_1 %int_1
 %_ptr_Function_v3int = OpTypePointer Function %v3int
-         %89 = OpConstantNull %v3int
+         %18 = OpTypeFunction %v4float
-         %90 = OpTypeFunction %v4float
     %float_1 = OpConstant %float 1
-%tint_first_trailing_bit = OpFunction %v3int None %9
+%firstTrailingBit_7496d6 = OpFunction %void None %9
-          %v = OpFunctionParameter %v3int
+         %12 = OpLabel
-         %14 = OpLabel
+        %res = OpVariable %_ptr_Function_v3int Function %15
-          %x = OpVariable %_ptr_Function_v3uint Function %20
+               OpStore %res %15
-         %15 = OpBitcast %v3uint %v
-               OpStore %x %15
-         %25 = OpLoad %v3uint %x
-         %28 = OpBitwiseAnd %v3uint %25 %27
-         %22 = OpINotEqual %v3bool %28 %20
-         %21 = OpSelect %v3uint %22 %20 %30
-         %31 = OpLoad %v3uint %x
-         %32 = OpShiftRightLogical %v3uint %31 %21
-               OpStore %x %32
-         %35 = OpLoad %v3uint %x
-         %38 = OpBitwiseAnd %v3uint %35 %37
-         %34 = OpINotEqual %v3bool %38 %20
-         %33 = OpSelect %v3uint %34 %20 %40
-         %41 = OpLoad %v3uint %x
-         %42 = OpShiftRightLogical %v3uint %41 %33
-               OpStore %x %42
-         %45 = OpLoad %v3uint %x
-         %48 = OpBitwiseAnd %v3uint %45 %47
-         %44 = OpINotEqual %v3bool %48 %20
-         %43 = OpSelect %v3uint %44 %20 %50
-         %51 = OpLoad %v3uint %x
-         %52 = OpShiftRightLogical %v3uint %51 %43
-               OpStore %x %52
-         %55 = OpLoad %v3uint %x
-         %58 = OpBitwiseAnd %v3uint %55 %57
-         %54 = OpINotEqual %v3bool %58 %20
-         %53 = OpSelect %v3uint %54 %20 %60
-         %61 = OpLoad %v3uint %x
-         %62 = OpShiftRightLogical %v3uint %61 %53
-               OpStore %x %62
-         %65 = OpLoad %v3uint %x
-         %68 = OpBitwiseAnd %v3uint %65 %67
-         %64 = OpINotEqual %v3bool %68 %20
-         %63 = OpSelect %v3uint %64 %20 %67
-         %70 = OpLoad %v3uint %x
-         %71 = OpIEqual %v3bool %70 %20
-         %69 = OpSelect %v3uint %71 %73 %20
-         %75 = OpBitwiseOr %v3uint %21 %33
-         %76 = OpBitwiseOr %v3uint %75 %43
-         %77 = OpBitwiseOr %v3uint %76 %53
-         %78 = OpBitwiseOr %v3uint %77 %63
-         %79 = OpBitwiseOr %v3uint %78 %69
-         %74 = OpBitcast %v3int %79
-               OpReturnValue %74
-               OpFunctionEnd
-%firstTrailingBit_7496d6 = OpFunction %void None %80
-         %83 = OpLabel
-        %res = OpVariable %_ptr_Function_v3int Function %89
-         %84 = OpFunctionCall %v3int %tint_first_trailing_bit %86
-               OpStore %res %84
                OpReturn
                OpFunctionEnd
-%vertex_main_inner = OpFunction %v4float None %90
+%vertex_main_inner = OpFunction %v4float None %18
-         %92 = OpLabel
+         %20 = OpLabel
-         %93 = OpFunctionCall %void %firstTrailingBit_7496d6
+         %21 = OpFunctionCall %void %firstTrailingBit_7496d6
                OpReturnValue %5
                OpFunctionEnd
-%vertex_main = OpFunction %void None %80
+%vertex_main = OpFunction %void None %9
-         %95 = OpLabel
+         %23 = OpLabel
-         %96 = OpFunctionCall %v4float %vertex_main_inner
+         %24 = OpFunctionCall %v4float %vertex_main_inner
-               OpStore %value %96
+               OpStore %value %24
                OpStore %vertex_point_size %float_1
                OpReturn
                OpFunctionEnd
-%fragment_main = OpFunction %void None %80
+%fragment_main = OpFunction %void None %9
-         %99 = OpLabel
+         %27 = OpLabel
-        %100 = OpFunctionCall %void %firstTrailingBit_7496d6
+         %28 = OpFunctionCall %void %firstTrailingBit_7496d6
                OpReturn
                OpFunctionEnd
-%compute_main = OpFunction %void None %80
+%compute_main = OpFunction %void None %9
-        %102 = OpLabel
+         %30 = OpLabel
-        %103 = OpFunctionCall %void %firstTrailingBit_7496d6
+         %31 = OpFunctionCall %void %firstTrailingBit_7496d6
                OpReturn
                OpFunctionEnd

test/tint/builtins/gen/literal/firstTrailingBit/86551b.wgsl.expected.dxc.hlsl

@@ -1,20 +1,5 @@
-int4 tint_first_trailing_bit(int4 v) {
-  uint4 x = uint4(v);
-  const uint4 b16 = (bool4((x & (65535u).xxxx)) ? (0u).xxxx : (16u).xxxx);
-  x = (x >> b16);
-  const uint4 b8 = (bool4((x & (255u).xxxx)) ? (0u).xxxx : (8u).xxxx);
-  x = (x >> b8);
-  const uint4 b4 = (bool4((x & (15u).xxxx)) ? (0u).xxxx : (4u).xxxx);
-  x = (x >> b4);
-  const uint4 b2 = (bool4((x & (3u).xxxx)) ? (0u).xxxx : (2u).xxxx);
-  x = (x >> b2);
-  const uint4 b1 = (bool4((x & (1u).xxxx)) ? (0u).xxxx : (1u).xxxx);
-  const uint4 is_zero = ((x == (0u).xxxx) ? (4294967295u).xxxx : (0u).xxxx);
-  return int4((((((b16 | b8) | b4) | b2) | b1) | is_zero));
-}
-
 void firstTrailingBit_86551b() {
-  int4 res = tint_first_trailing_bit((1).xxxx);
+  int4 res = (0).xxxx;
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/firstTrailingBit/86551b.wgsl.expected.fxc.hlsl

@@ -1,20 +1,5 @@
-int4 tint_first_trailing_bit(int4 v) {
-  uint4 x = uint4(v);
-  const uint4 b16 = (bool4((x & (65535u).xxxx)) ? (0u).xxxx : (16u).xxxx);
-  x = (x >> b16);
-  const uint4 b8 = (bool4((x & (255u).xxxx)) ? (0u).xxxx : (8u).xxxx);
-  x = (x >> b8);
-  const uint4 b4 = (bool4((x & (15u).xxxx)) ? (0u).xxxx : (4u).xxxx);
-  x = (x >> b4);
-  const uint4 b2 = (bool4((x & (3u).xxxx)) ? (0u).xxxx : (2u).xxxx);
-  x = (x >> b2);
-  const uint4 b1 = (bool4((x & (1u).xxxx)) ? (0u).xxxx : (1u).xxxx);
-  const uint4 is_zero = ((x == (0u).xxxx) ? (4294967295u).xxxx : (0u).xxxx);
-  return int4((((((b16 | b8) | b4) | b2) | b1) | is_zero));
-}
-
 void firstTrailingBit_86551b() {
-  int4 res = tint_first_trailing_bit((1).xxxx);
+  int4 res = (0).xxxx;
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/firstTrailingBit/86551b.wgsl.expected.glsl

@@ -1,22 +1,7 @@
 #version 310 es
 
-ivec4 tint_first_trailing_bit(ivec4 v) {
-  uvec4 x = uvec4(v);
-  uvec4 b16 = mix(uvec4(16u), uvec4(0u), bvec4((x & uvec4(65535u))));
-  x = (x >> b16);
-  uvec4 b8 = mix(uvec4(8u), uvec4(0u), bvec4((x & uvec4(255u))));
-  x = (x >> b8);
-  uvec4 b4 = mix(uvec4(4u), uvec4(0u), bvec4((x & uvec4(15u))));
-  x = (x >> b4);
-  uvec4 b2 = mix(uvec4(2u), uvec4(0u), bvec4((x & uvec4(3u))));
-  x = (x >> b2);
-  uvec4 b1 = mix(uvec4(1u), uvec4(0u), bvec4((x & uvec4(1u))));
-  uvec4 is_zero = mix(uvec4(0u), uvec4(4294967295u), equal(x, uvec4(0u)));
-  return ivec4((((((b16 | b8) | b4) | b2) | b1) | is_zero));
-}
-
 void firstTrailingBit_86551b() {
-  ivec4 res = tint_first_trailing_bit(ivec4(1));
+  ivec4 res = ivec4(0);
 }
 
 vec4 vertex_main() {
@@ -35,23 +20,8 @@ void main() {
 #version 310 es
 precision mediump float;
 
-ivec4 tint_first_trailing_bit(ivec4 v) {
-  uvec4 x = uvec4(v);
-  uvec4 b16 = mix(uvec4(16u), uvec4(0u), bvec4((x & uvec4(65535u))));
-  x = (x >> b16);
-  uvec4 b8 = mix(uvec4(8u), uvec4(0u), bvec4((x & uvec4(255u))));
-  x = (x >> b8);
-  uvec4 b4 = mix(uvec4(4u), uvec4(0u), bvec4((x & uvec4(15u))));
-  x = (x >> b4);
-  uvec4 b2 = mix(uvec4(2u), uvec4(0u), bvec4((x & uvec4(3u))));
-  x = (x >> b2);
-  uvec4 b1 = mix(uvec4(1u), uvec4(0u), bvec4((x & uvec4(1u))));
-  uvec4 is_zero = mix(uvec4(0u), uvec4(4294967295u), equal(x, uvec4(0u)));
-  return ivec4((((((b16 | b8) | b4) | b2) | b1) | is_zero));
-}
-
 void firstTrailingBit_86551b() {
-  ivec4 res = tint_first_trailing_bit(ivec4(1));
+  ivec4 res = ivec4(0);
 }
 
 void fragment_main() {
@@ -64,23 +34,8 @@ void main() {
 }
 #version 310 es
 
-ivec4 tint_first_trailing_bit(ivec4 v) {
-  uvec4 x = uvec4(v);
-  uvec4 b16 = mix(uvec4(16u), uvec4(0u), bvec4((x & uvec4(65535u))));
-  x = (x >> b16);
-  uvec4 b8 = mix(uvec4(8u), uvec4(0u), bvec4((x & uvec4(255u))));
-  x = (x >> b8);
-  uvec4 b4 = mix(uvec4(4u), uvec4(0u), bvec4((x & uvec4(15u))));
-  x = (x >> b4);
-  uvec4 b2 = mix(uvec4(2u), uvec4(0u), bvec4((x & uvec4(3u))));
-  x = (x >> b2);
-  uvec4 b1 = mix(uvec4(1u), uvec4(0u), bvec4((x & uvec4(1u))));
-  uvec4 is_zero = mix(uvec4(0u), uvec4(4294967295u), equal(x, uvec4(0u)));
-  return ivec4((((((b16 | b8) | b4) | b2) | b1) | is_zero));
-}
-
 void firstTrailingBit_86551b() {
-  ivec4 res = tint_first_trailing_bit(ivec4(1));
+  ivec4 res = ivec4(0);
 }
 
 void compute_main() {

test/tint/builtins/gen/literal/firstTrailingBit/86551b.wgsl.expected.msl

@@ -1,23 +1,8 @@
 #include <metal_stdlib>
 
 using namespace metal;
-int4 tint_first_trailing_bit(int4 v) {
-  uint4 x = uint4(v);
-  uint4 const b16 = select(uint4(16u), uint4(0u), bool4((x & uint4(65535u))));
-  x = (x >> b16);
-  uint4 const b8 = select(uint4(8u), uint4(0u), bool4((x & uint4(255u))));
-  x = (x >> b8);
-  uint4 const b4 = select(uint4(4u), uint4(0u), bool4((x & uint4(15u))));
-  x = (x >> b4);
-  uint4 const b2 = select(uint4(2u), uint4(0u), bool4((x & uint4(3u))));
-  x = (x >> b2);
-  uint4 const b1 = select(uint4(1u), uint4(0u), bool4((x & uint4(1u))));
-  uint4 const is_zero = select(uint4(0u), uint4(4294967295u), (x == uint4(0u)));
-  return int4((((((b16 | b8) | b4) | b2) | b1) | is_zero));
-}
-
 void firstTrailingBit_86551b() {
-  int4 res = tint_first_trailing_bit(int4(1));
+  int4 res = int4(0);
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/firstTrailingBit/86551b.wgsl.expected.spvasm

@@ -1,7 +1,7 @@
 ; SPIR-V
 ; Version: 1.3
 ; Generator: Google Tint Compiler; 0
-; Bound: 104
+; Bound: 32
 ; Schema: 0
                OpCapability Shader
                OpMemoryModel Logical GLSL450
@@ -12,9 +12,6 @@
                OpExecutionMode %compute_main LocalSize 1 1 1
                OpName %value "value"
                OpName %vertex_point_size "vertex_point_size"
-               OpName %tint_first_trailing_bit "tint_first_trailing_bit"
-               OpName %v "v"
-               OpName %x "x"
                OpName %firstTrailingBit_86551b "firstTrailingBit_86551b"
                OpName %res "res"
                OpName %vertex_main_inner "vertex_main_inner"
@@ -31,118 +28,39 @@
 %_ptr_Output_float = OpTypePointer Output %float
           %8 = OpConstantNull %float
 %vertex_point_size = OpVariable %_ptr_Output_float Output %8
+       %void = OpTypeVoid
+          %9 = OpTypeFunction %void
         %int = OpTypeInt 32 1
       %v4int = OpTypeVector %int 4
-          %9 = OpTypeFunction %v4int %v4int
+         %15 = OpConstantNull %v4int
-       %uint = OpTypeInt 32 0
-     %v4uint = OpTypeVector %uint 4
-%_ptr_Function_v4uint = OpTypePointer Function %v4uint
-         %20 = OpConstantNull %v4uint
-       %bool = OpTypeBool
-     %v4bool = OpTypeVector %bool 4
- %uint_65535 = OpConstant %uint 65535
-         %27 = OpConstantComposite %v4uint %uint_65535 %uint_65535 %uint_65535 %uint_65535
-    %uint_16 = OpConstant %uint 16
-         %30 = OpConstantComposite %v4uint %uint_16 %uint_16 %uint_16 %uint_16
-   %uint_255 = OpConstant %uint 255
-         %37 = OpConstantComposite %v4uint %uint_255 %uint_255 %uint_255 %uint_255
-     %uint_8 = OpConstant %uint 8
-         %40 = OpConstantComposite %v4uint %uint_8 %uint_8 %uint_8 %uint_8
-    %uint_15 = OpConstant %uint 15
-         %47 = OpConstantComposite %v4uint %uint_15 %uint_15 %uint_15 %uint_15
-     %uint_4 = OpConstant %uint 4
-         %50 = OpConstantComposite %v4uint %uint_4 %uint_4 %uint_4 %uint_4
-     %uint_3 = OpConstant %uint 3
-         %57 = OpConstantComposite %v4uint %uint_3 %uint_3 %uint_3 %uint_3
-     %uint_2 = OpConstant %uint 2
-         %60 = OpConstantComposite %v4uint %uint_2 %uint_2 %uint_2 %uint_2
-     %uint_1 = OpConstant %uint 1
-         %67 = OpConstantComposite %v4uint %uint_1 %uint_1 %uint_1 %uint_1
-%uint_4294967295 = OpConstant %uint 4294967295
-         %73 = OpConstantComposite %v4uint %uint_4294967295 %uint_4294967295 %uint_4294967295 %uint_4294967295
-       %void = OpTypeVoid
-         %80 = OpTypeFunction %void
-      %int_1 = OpConstant %int 1
-         %86 = OpConstantComposite %v4int %int_1 %int_1 %int_1 %int_1
 %_ptr_Function_v4int = OpTypePointer Function %v4int
-         %89 = OpConstantNull %v4int
+         %18 = OpTypeFunction %v4float
-         %90 = OpTypeFunction %v4float
     %float_1 = OpConstant %float 1
-%tint_first_trailing_bit = OpFunction %v4int None %9
+%firstTrailingBit_86551b = OpFunction %void None %9
-          %v = OpFunctionParameter %v4int
+         %12 = OpLabel
-         %14 = OpLabel
+        %res = OpVariable %_ptr_Function_v4int Function %15
-          %x = OpVariable %_ptr_Function_v4uint Function %20
+               OpStore %res %15
-         %15 = OpBitcast %v4uint %v
-               OpStore %x %15
-         %25 = OpLoad %v4uint %x
-         %28 = OpBitwiseAnd %v4uint %25 %27
-         %22 = OpINotEqual %v4bool %28 %20
-         %21 = OpSelect %v4uint %22 %20 %30
-         %31 = OpLoad %v4uint %x
-         %32 = OpShiftRightLogical %v4uint %31 %21
-               OpStore %x %32
-         %35 = OpLoad %v4uint %x
-         %38 = OpBitwiseAnd %v4uint %35 %37
-         %34 = OpINotEqual %v4bool %38 %20
-         %33 = OpSelect %v4uint %34 %20 %40
-         %41 = OpLoad %v4uint %x
-         %42 = OpShiftRightLogical %v4uint %41 %33
-               OpStore %x %42
-         %45 = OpLoad %v4uint %x
-         %48 = OpBitwiseAnd %v4uint %45 %47
-         %44 = OpINotEqual %v4bool %48 %20
-         %43 = OpSelect %v4uint %44 %20 %50
-         %51 = OpLoad %v4uint %x
-         %52 = OpShiftRightLogical %v4uint %51 %43
-               OpStore %x %52
-         %55 = OpLoad %v4uint %x
-         %58 = OpBitwiseAnd %v4uint %55 %57
-         %54 = OpINotEqual %v4bool %58 %20
-         %53 = OpSelect %v4uint %54 %20 %60
-         %61 = OpLoad %v4uint %x
-         %62 = OpShiftRightLogical %v4uint %61 %53
-               OpStore %x %62
-         %65 = OpLoad %v4uint %x
-         %68 = OpBitwiseAnd %v4uint %65 %67
-         %64 = OpINotEqual %v4bool %68 %20
-         %63 = OpSelect %v4uint %64 %20 %67
-         %70 = OpLoad %v4uint %x
-         %71 = OpIEqual %v4bool %70 %20
-         %69 = OpSelect %v4uint %71 %73 %20
-         %75 = OpBitwiseOr %v4uint %21 %33
-         %76 = OpBitwiseOr %v4uint %75 %43
-         %77 = OpBitwiseOr %v4uint %76 %53
-         %78 = OpBitwiseOr %v4uint %77 %63
-         %79 = OpBitwiseOr %v4uint %78 %69
-         %74 = OpBitcast %v4int %79
-               OpReturnValue %74
-               OpFunctionEnd
-%firstTrailingBit_86551b = OpFunction %void None %80
-         %83 = OpLabel
-        %res = OpVariable %_ptr_Function_v4int Function %89
-         %84 = OpFunctionCall %v4int %tint_first_trailing_bit %86
-               OpStore %res %84
                OpReturn
                OpFunctionEnd
-%vertex_main_inner = OpFunction %v4float None %90
+%vertex_main_inner = OpFunction %v4float None %18
-         %92 = OpLabel
+         %20 = OpLabel
-         %93 = OpFunctionCall %void %firstTrailingBit_86551b
+         %21 = OpFunctionCall %void %firstTrailingBit_86551b
                OpReturnValue %5
                OpFunctionEnd
-%vertex_main = OpFunction %void None %80
+%vertex_main = OpFunction %void None %9
-         %95 = OpLabel
+         %23 = OpLabel
-         %96 = OpFunctionCall %v4float %vertex_main_inner
+         %24 = OpFunctionCall %v4float %vertex_main_inner
-               OpStore %value %96
+               OpStore %value %24
                OpStore %vertex_point_size %float_1
                OpReturn
                OpFunctionEnd
-%fragment_main = OpFunction %void None %80
+%fragment_main = OpFunction %void None %9
-         %99 = OpLabel
+         %27 = OpLabel
-        %100 = OpFunctionCall %void %firstTrailingBit_86551b
+         %28 = OpFunctionCall %void %firstTrailingBit_86551b
                OpReturn
                OpFunctionEnd
-%compute_main = OpFunction %void None %80
+%compute_main = OpFunction %void None %9
-        %102 = OpLabel
+         %30 = OpLabel
-        %103 = OpFunctionCall %void %firstTrailingBit_86551b
+         %31 = OpFunctionCall %void %firstTrailingBit_86551b
                OpReturn
                OpFunctionEnd

test/tint/builtins/gen/literal/firstTrailingBit/cb51ce.wgsl.expected.dxc.hlsl

@@ -1,20 +1,5 @@
-uint3 tint_first_trailing_bit(uint3 v) {
-  uint3 x = uint3(v);
-  const uint3 b16 = (bool3((x & (65535u).xxx)) ? (0u).xxx : (16u).xxx);
-  x = (x >> b16);
-  const uint3 b8 = (bool3((x & (255u).xxx)) ? (0u).xxx : (8u).xxx);
-  x = (x >> b8);
-  const uint3 b4 = (bool3((x & (15u).xxx)) ? (0u).xxx : (4u).xxx);
-  x = (x >> b4);
-  const uint3 b2 = (bool3((x & (3u).xxx)) ? (0u).xxx : (2u).xxx);
-  x = (x >> b2);
-  const uint3 b1 = (bool3((x & (1u).xxx)) ? (0u).xxx : (1u).xxx);
-  const uint3 is_zero = ((x == (0u).xxx) ? (4294967295u).xxx : (0u).xxx);
-  return uint3((((((b16 | b8) | b4) | b2) | b1) | is_zero));
-}
-
 void firstTrailingBit_cb51ce() {
-  uint3 res = tint_first_trailing_bit((1u).xxx);
+  uint3 res = (0u).xxx;
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/firstTrailingBit/cb51ce.wgsl.expected.fxc.hlsl

@@ -1,20 +1,5 @@
-uint3 tint_first_trailing_bit(uint3 v) {
-  uint3 x = uint3(v);
-  const uint3 b16 = (bool3((x & (65535u).xxx)) ? (0u).xxx : (16u).xxx);
-  x = (x >> b16);
-  const uint3 b8 = (bool3((x & (255u).xxx)) ? (0u).xxx : (8u).xxx);
-  x = (x >> b8);
-  const uint3 b4 = (bool3((x & (15u).xxx)) ? (0u).xxx : (4u).xxx);
-  x = (x >> b4);
-  const uint3 b2 = (bool3((x & (3u).xxx)) ? (0u).xxx : (2u).xxx);
-  x = (x >> b2);
-  const uint3 b1 = (bool3((x & (1u).xxx)) ? (0u).xxx : (1u).xxx);
-  const uint3 is_zero = ((x == (0u).xxx) ? (4294967295u).xxx : (0u).xxx);
-  return uint3((((((b16 | b8) | b4) | b2) | b1) | is_zero));
-}
-
 void firstTrailingBit_cb51ce() {
-  uint3 res = tint_first_trailing_bit((1u).xxx);
+  uint3 res = (0u).xxx;
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/firstTrailingBit/cb51ce.wgsl.expected.glsl

@@ -1,22 +1,7 @@
 #version 310 es
 
-uvec3 tint_first_trailing_bit(uvec3 v) {
-  uvec3 x = uvec3(v);
-  uvec3 b16 = mix(uvec3(16u), uvec3(0u), bvec3((x & uvec3(65535u))));
-  x = (x >> b16);
-  uvec3 b8 = mix(uvec3(8u), uvec3(0u), bvec3((x & uvec3(255u))));
-  x = (x >> b8);
-  uvec3 b4 = mix(uvec3(4u), uvec3(0u), bvec3((x & uvec3(15u))));
-  x = (x >> b4);
-  uvec3 b2 = mix(uvec3(2u), uvec3(0u), bvec3((x & uvec3(3u))));
-  x = (x >> b2);
-  uvec3 b1 = mix(uvec3(1u), uvec3(0u), bvec3((x & uvec3(1u))));
-  uvec3 is_zero = mix(uvec3(0u), uvec3(4294967295u), equal(x, uvec3(0u)));
-  return uvec3((((((b16 | b8) | b4) | b2) | b1) | is_zero));
-}
-
 void firstTrailingBit_cb51ce() {
-  uvec3 res = tint_first_trailing_bit(uvec3(1u));
+  uvec3 res = uvec3(0u);
 }
 
 vec4 vertex_main() {
@@ -35,23 +20,8 @@ void main() {
 #version 310 es
 precision mediump float;
 
-uvec3 tint_first_trailing_bit(uvec3 v) {
-  uvec3 x = uvec3(v);
-  uvec3 b16 = mix(uvec3(16u), uvec3(0u), bvec3((x & uvec3(65535u))));
-  x = (x >> b16);
-  uvec3 b8 = mix(uvec3(8u), uvec3(0u), bvec3((x & uvec3(255u))));
-  x = (x >> b8);
-  uvec3 b4 = mix(uvec3(4u), uvec3(0u), bvec3((x & uvec3(15u))));
-  x = (x >> b4);
-  uvec3 b2 = mix(uvec3(2u), uvec3(0u), bvec3((x & uvec3(3u))));
-  x = (x >> b2);
-  uvec3 b1 = mix(uvec3(1u), uvec3(0u), bvec3((x & uvec3(1u))));
-  uvec3 is_zero = mix(uvec3(0u), uvec3(4294967295u), equal(x, uvec3(0u)));
-  return uvec3((((((b16 | b8) | b4) | b2) | b1) | is_zero));
-}
-
 void firstTrailingBit_cb51ce() {
-  uvec3 res = tint_first_trailing_bit(uvec3(1u));
+  uvec3 res = uvec3(0u);
 }
 
 void fragment_main() {
@@ -64,23 +34,8 @@ void main() {
 }
 #version 310 es
 
-uvec3 tint_first_trailing_bit(uvec3 v) {
-  uvec3 x = uvec3(v);
-  uvec3 b16 = mix(uvec3(16u), uvec3(0u), bvec3((x & uvec3(65535u))));
-  x = (x >> b16);
-  uvec3 b8 = mix(uvec3(8u), uvec3(0u), bvec3((x & uvec3(255u))));
-  x = (x >> b8);
-  uvec3 b4 = mix(uvec3(4u), uvec3(0u), bvec3((x & uvec3(15u))));
-  x = (x >> b4);
-  uvec3 b2 = mix(uvec3(2u), uvec3(0u), bvec3((x & uvec3(3u))));
-  x = (x >> b2);
-  uvec3 b1 = mix(uvec3(1u), uvec3(0u), bvec3((x & uvec3(1u))));
-  uvec3 is_zero = mix(uvec3(0u), uvec3(4294967295u), equal(x, uvec3(0u)));
-  return uvec3((((((b16 | b8) | b4) | b2) | b1) | is_zero));
-}
-
 void firstTrailingBit_cb51ce() {
-  uvec3 res = tint_first_trailing_bit(uvec3(1u));
+  uvec3 res = uvec3(0u);
 }
 
 void compute_main() {

test/tint/builtins/gen/literal/firstTrailingBit/cb51ce.wgsl.expected.msl

@@ -1,23 +1,8 @@
 #include <metal_stdlib>
 
 using namespace metal;
-uint3 tint_first_trailing_bit(uint3 v) {
-  uint3 x = uint3(v);
-  uint3 const b16 = select(uint3(16u), uint3(0u), bool3((x & uint3(65535u))));
-  x = (x >> b16);
-  uint3 const b8 = select(uint3(8u), uint3(0u), bool3((x & uint3(255u))));
-  x = (x >> b8);
-  uint3 const b4 = select(uint3(4u), uint3(0u), bool3((x & uint3(15u))));
-  x = (x >> b4);
-  uint3 const b2 = select(uint3(2u), uint3(0u), bool3((x & uint3(3u))));
-  x = (x >> b2);
-  uint3 const b1 = select(uint3(1u), uint3(0u), bool3((x & uint3(1u))));
-  uint3 const is_zero = select(uint3(0u), uint3(4294967295u), (x == uint3(0u)));
-  return uint3((((((b16 | b8) | b4) | b2) | b1) | is_zero));
-}
-
 void firstTrailingBit_cb51ce() {
-  uint3 res = tint_first_trailing_bit(uint3(1u));
+  uint3 res = uint3(0u);
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/firstTrailingBit/cb51ce.wgsl.expected.spvasm

@@ -1,7 +1,7 @@
 ; SPIR-V
 ; Version: 1.3
 ; Generator: Google Tint Compiler; 0
-; Bound: 98
+; Bound: 32
 ; Schema: 0
                OpCapability Shader
                OpMemoryModel Logical GLSL450
@@ -12,9 +12,6 @@
                OpExecutionMode %compute_main LocalSize 1 1 1
                OpName %value "value"
                OpName %vertex_point_size "vertex_point_size"
-               OpName %tint_first_trailing_bit "tint_first_trailing_bit"
-               OpName %v "v"
-               OpName %x "x"
                OpName %firstTrailingBit_cb51ce "firstTrailingBit_cb51ce"
                OpName %res "res"
                OpName %vertex_main_inner "vertex_main_inner"
@@ -31,110 +28,39 @@
 %_ptr_Output_float = OpTypePointer Output %float
           %8 = OpConstantNull %float
 %vertex_point_size = OpVariable %_ptr_Output_float Output %8
+       %void = OpTypeVoid
+          %9 = OpTypeFunction %void
        %uint = OpTypeInt 32 0
      %v3uint = OpTypeVector %uint 3
-          %9 = OpTypeFunction %v3uint %v3uint
+         %15 = OpConstantNull %v3uint
 %_ptr_Function_v3uint = OpTypePointer Function %v3uint
-         %18 = OpConstantNull %v3uint
+         %18 = OpTypeFunction %v4float
-       %bool = OpTypeBool
-     %v3bool = OpTypeVector %bool 3
- %uint_65535 = OpConstant %uint 65535
-         %25 = OpConstantComposite %v3uint %uint_65535 %uint_65535 %uint_65535
-    %uint_16 = OpConstant %uint 16
-         %28 = OpConstantComposite %v3uint %uint_16 %uint_16 %uint_16
-   %uint_255 = OpConstant %uint 255
-         %35 = OpConstantComposite %v3uint %uint_255 %uint_255 %uint_255
-     %uint_8 = OpConstant %uint 8
-         %38 = OpConstantComposite %v3uint %uint_8 %uint_8 %uint_8
-    %uint_15 = OpConstant %uint 15
-         %45 = OpConstantComposite %v3uint %uint_15 %uint_15 %uint_15
-     %uint_4 = OpConstant %uint 4
-         %48 = OpConstantComposite %v3uint %uint_4 %uint_4 %uint_4
-     %uint_3 = OpConstant %uint 3
-         %55 = OpConstantComposite %v3uint %uint_3 %uint_3 %uint_3
-     %uint_2 = OpConstant %uint 2
-         %58 = OpConstantComposite %v3uint %uint_2 %uint_2 %uint_2
-     %uint_1 = OpConstant %uint 1
-         %65 = OpConstantComposite %v3uint %uint_1 %uint_1 %uint_1
-%uint_4294967295 = OpConstant %uint 4294967295
-         %71 = OpConstantComposite %v3uint %uint_4294967295 %uint_4294967295 %uint_4294967295
-       %void = OpTypeVoid
-         %78 = OpTypeFunction %void
-         %84 = OpTypeFunction %v4float
     %float_1 = OpConstant %float 1
-%tint_first_trailing_bit = OpFunction %v3uint None %9
+%firstTrailingBit_cb51ce = OpFunction %void None %9
-          %v = OpFunctionParameter %v3uint
+         %12 = OpLabel
-         %14 = OpLabel
+        %res = OpVariable %_ptr_Function_v3uint Function %15
-          %x = OpVariable %_ptr_Function_v3uint Function %18
+               OpStore %res %15
-               OpStore %x %v
-         %23 = OpLoad %v3uint %x
-         %26 = OpBitwiseAnd %v3uint %23 %25
-         %20 = OpINotEqual %v3bool %26 %18
-         %19 = OpSelect %v3uint %20 %18 %28
-         %29 = OpLoad %v3uint %x
-         %30 = OpShiftRightLogical %v3uint %29 %19
-               OpStore %x %30
-         %33 = OpLoad %v3uint %x
-         %36 = OpBitwiseAnd %v3uint %33 %35
-         %32 = OpINotEqual %v3bool %36 %18
-         %31 = OpSelect %v3uint %32 %18 %38
-         %39 = OpLoad %v3uint %x
-         %40 = OpShiftRightLogical %v3uint %39 %31
-               OpStore %x %40
-         %43 = OpLoad %v3uint %x
-         %46 = OpBitwiseAnd %v3uint %43 %45
-         %42 = OpINotEqual %v3bool %46 %18
-         %41 = OpSelect %v3uint %42 %18 %48
-         %49 = OpLoad %v3uint %x
-         %50 = OpShiftRightLogical %v3uint %49 %41
-               OpStore %x %50
-         %53 = OpLoad %v3uint %x
-         %56 = OpBitwiseAnd %v3uint %53 %55
-         %52 = OpINotEqual %v3bool %56 %18
-         %51 = OpSelect %v3uint %52 %18 %58
-         %59 = OpLoad %v3uint %x
-         %60 = OpShiftRightLogical %v3uint %59 %51
-               OpStore %x %60
-         %63 = OpLoad %v3uint %x
-         %66 = OpBitwiseAnd %v3uint %63 %65
-         %62 = OpINotEqual %v3bool %66 %18
-         %61 = OpSelect %v3uint %62 %18 %65
-         %68 = OpLoad %v3uint %x
-         %69 = OpIEqual %v3bool %68 %18
-         %67 = OpSelect %v3uint %69 %71 %18
-         %73 = OpBitwiseOr %v3uint %19 %31
-         %74 = OpBitwiseOr %v3uint %73 %41
-         %75 = OpBitwiseOr %v3uint %74 %51
-         %76 = OpBitwiseOr %v3uint %75 %61
-         %77 = OpBitwiseOr %v3uint %76 %67
-               OpReturnValue %77
-               OpFunctionEnd
-%firstTrailingBit_cb51ce = OpFunction %void None %78
-         %81 = OpLabel
-        %res = OpVariable %_ptr_Function_v3uint Function %18
-         %82 = OpFunctionCall %v3uint %tint_first_trailing_bit %65
-               OpStore %res %82
                OpReturn
                OpFunctionEnd
-%vertex_main_inner = OpFunction %v4float None %84
+%vertex_main_inner = OpFunction %v4float None %18
-         %86 = OpLabel
+         %20 = OpLabel
-         %87 = OpFunctionCall %void %firstTrailingBit_cb51ce
+         %21 = OpFunctionCall %void %firstTrailingBit_cb51ce
                OpReturnValue %5
                OpFunctionEnd
-%vertex_main = OpFunction %void None %78
+%vertex_main = OpFunction %void None %9
-         %89 = OpLabel
+         %23 = OpLabel
-         %90 = OpFunctionCall %v4float %vertex_main_inner
+         %24 = OpFunctionCall %v4float %vertex_main_inner
-               OpStore %value %90
+               OpStore %value %24
                OpStore %vertex_point_size %float_1
                OpReturn
                OpFunctionEnd
-%fragment_main = OpFunction %void None %78
+%fragment_main = OpFunction %void None %9
-         %93 = OpLabel
+         %27 = OpLabel
-         %94 = OpFunctionCall %void %firstTrailingBit_cb51ce
+         %28 = OpFunctionCall %void %firstTrailingBit_cb51ce
                OpReturn
                OpFunctionEnd
-%compute_main = OpFunction %void None %78
+%compute_main = OpFunction %void None %9
-         %96 = OpLabel
+         %30 = OpLabel
-         %97 = OpFunctionCall %void %firstTrailingBit_cb51ce
+         %31 = OpFunctionCall %void %firstTrailingBit_cb51ce
                OpReturn
                OpFunctionEnd

webgpu-cts/expectations.txt

@@ -494,14 +494,6 @@ crbug.com/tint/1613 webgpu:shader,execution,expression,call,builtin,extractBits:
 crbug.com/tint/1613 webgpu:shader,execution,expression,call,builtin,extractBits:u32:inputSource="const";width=2 [ Failure ]
 crbug.com/tint/1613 webgpu:shader,execution,expression,call,builtin,extractBits:u32:inputSource="const";width=3 [ Failure ]
 crbug.com/tint/1613 webgpu:shader,execution,expression,call,builtin,extractBits:u32:inputSource="const";width=4 [ Failure ]
-crbug.com/tint/1613 webgpu:shader,execution,expression,call,builtin,firstTrailingBit:i32:inputSource="const";vectorize="_undef_" [ Failure ]
-crbug.com/tint/1613 webgpu:shader,execution,expression,call,builtin,firstTrailingBit:i32:inputSource="const";vectorize=2 [ Failure ]
-crbug.com/tint/1613 webgpu:shader,execution,expression,call,builtin,firstTrailingBit:i32:inputSource="const";vectorize=3 [ Failure ]
-crbug.com/tint/1613 webgpu:shader,execution,expression,call,builtin,firstTrailingBit:i32:inputSource="const";vectorize=4 [ Failure ]
-crbug.com/tint/1613 webgpu:shader,execution,expression,call,builtin,firstTrailingBit:u32:inputSource="const";vectorize="_undef_" [ Failure ]
-crbug.com/tint/1613 webgpu:shader,execution,expression,call,builtin,firstTrailingBit:u32:inputSource="const";vectorize=2 [ Failure ]
-crbug.com/tint/1613 webgpu:shader,execution,expression,call,builtin,firstTrailingBit:u32:inputSource="const";vectorize=3 [ Failure ]
-crbug.com/tint/1613 webgpu:shader,execution,expression,call,builtin,firstTrailingBit:u32:inputSource="const";vectorize=4 [ Failure ]
 crbug.com/tint/1613 webgpu:shader,execution,expression,call,builtin,floor:f32:inputSource="const";vectorize="_undef_" [ Failure ]
 crbug.com/tint/1613 webgpu:shader,execution,expression,call,builtin,floor:f32:inputSource="const";vectorize=2 [ Failure ]
 crbug.com/tint/1613 webgpu:shader,execution,expression,call,builtin,floor:f32:inputSource="const";vectorize=3 [ Failure ]