Implement const-eval for `acos`

This CL adds const-eval for the `acos` builtin.

Bug: tint:1581
Change-Id: I01c0f48e73eedf87cf9c912715487f8eea44f64e
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/108341
Commit-Queue: Dan Sinclair <dsinclair@chromium.org>
Reviewed-by: Antonio Maiorano <amaiorano@google.com>
Kokoro: Kokoro <noreply+kokoro@google.com>

src/tint/intrinsics.def

@@ -406,8 +406,8 @@ match storage
 // https://gpuweb.github.io/gpuweb/wgsl/#builtin-functions
 @const fn abs<T: fia_fiu32_f16>(T) -> T
 @const fn abs<N: num, T: fia_fiu32_f16>(vec<N, T>) -> vec<N, T>
-fn acos<T: f32_f16>(T) -> T
+@const fn acos<T: fa_f32_f16>(@test_value(0.87758256189) T) -> T
-fn acos<N: num, T: f32_f16>(vec<N, T>) -> vec<N, T>
+@const fn acos<N: num, T: fa_f32_f16>(@test_value(0.87758256189) vec<N, T>) -> vec<N, T>
 fn acosh<T: f32_f16>(T) -> T
 fn acosh<N: num, T: f32_f16>(vec<N, T>) -> vec<N, T>
 @const fn all(bool) -> bool

src/tint/resolver/const_eval.cc

@@ -1595,6 +1595,23 @@ ConstEval::Result ConstEval::abs(const sem::Type* ty,
     return TransformElements(builder, ty, transform, args[0]);
 }
 
+ConstEval::Result ConstEval::acos(const sem::Type* ty,
+                                  utils::VectorRef<const sem::Constant*> args,
+                                  const Source& source) {
+    auto transform = [&](const sem::Constant* c0) {
+        auto create = [&](auto i) -> ImplResult {
+            using NumberT = decltype(i);
+            if (i < NumberT(-1.0) || i > NumberT(1.0)) {
+                AddError("acos must be called with a value in the range [-1, 1]", source);
+                return utils::Failure;
+            }
+            return CreateElement(builder, c0->Type(), NumberT(std::acos(i.value)));
+        };
+        return Dispatch_fa_f32_f16(create, c0);
+    };
+    return TransformElements(builder, ty, transform, args[0]);
+}
+
 ConstEval::Result ConstEval::all(const sem::Type* ty,
                                  utils::VectorRef<const sem::Constant*> args,
                                  const Source&) {
@@ -1613,11 +1630,11 @@ ConstEval::Result ConstEval::asin(const sem::Type* ty,
     auto transform = [&](const sem::Constant* c0) {
         auto create = [&](auto i) -> ImplResult {
             using NumberT = decltype(i);
-            if (i.value < NumberT(-1.0) || i.value > NumberT(1.0)) {
+            if (i < NumberT(-1.0) || i > NumberT(1.0)) {
                 AddError("asin must be called with a value in the range [-1, 1]", source);
                 return utils::Failure;
             }
-            return CreateElement(builder, c0->Type(), decltype(i)(std::asin(i.value)));
+            return CreateElement(builder, c0->Type(), NumberT(std::asin(i.value)));
         };
         return Dispatch_fa_f32_f16(create, c0);
     };
@@ -1659,11 +1676,11 @@ ConstEval::Result ConstEval::atanh(const sem::Type* ty,
     auto transform = [&](const sem::Constant* c0) {
         auto create = [&](auto i) -> ImplResult {
             using NumberT = decltype(i);
-            if (i.value <= NumberT(-1.0) || i.value >= NumberT(1.0)) {
+            if (i <= NumberT(-1.0) || i >= NumberT(1.0)) {
                 AddError("atanh must be called with a value in the range (-1, 1)", source);
                 return utils::Failure;
             }
-            return CreateElement(builder, c0->Type(), decltype(i)(std::atanh(i.value)));
+            return CreateElement(builder, c0->Type(), NumberT(std::atanh(i.value)));
         };
         return Dispatch_fa_f32_f16(create, c0);
     };

src/tint/resolver/const_eval.h

@@ -395,6 +395,15 @@ class ConstEval {
                utils::VectorRef<const sem::Constant*> args,
                const Source& source);
 
+    /// acos 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 acos(const sem::Type* ty,
+                utils::VectorRef<const sem::Constant*> args,
+                const Source& source);
+
     /// any builtin
     /// @param ty the expression type
     /// @param args the input arguments

src/tint/resolver/const_eval_builtin_test.cc

@@ -425,6 +425,70 @@ TEST_F(ResolverConstEvalBuiltinTest, Atanh_OutsideRange_Negative_INF) {
     EXPECT_EQ(r()->error(), "12:24 error: atanh must be called with a value in the range (-1, 1)");
 }
 
+template <typename T, bool finite_only>
+std::vector<Case> AcosCases() {
+    std::vector<Case> cases = {
+        // If i is +/-0, +/-0 is returned
+        C({T(0.87758256189)}, T(0.5)).FloatComp(),
+
+        C({T(1.0)}, T(0.0)),
+        C({-T(1.0)}, kPi<T>).FloatComp(),
+
+        // Vector tests
+        C({Vec(T(1.0), -T(1.0))}, Vec(T(0), kPi<T>)).FloatComp(),
+    };
+
+    ConcatIntoIf<!finite_only>(  //
+        cases, std::vector<Case>{
+                   // If i is NaN, NaN is returned
+                   C({T::NaN()}, T::NaN()),
+
+                   // Vector tests
+                   C({Vec(T::NaN(), T::NaN())}, Vec(T::NaN(), T::NaN())),
+               });
+
+    return cases;
+}
+INSTANTIATE_TEST_SUITE_P(  //
+    Acos,
+    ResolverConstEvalBuiltinTest,
+    testing::Combine(testing::Values(sem::BuiltinType::kAcos),
+                     testing::ValuesIn(Concat(AcosCases<AFloat, true>(),  //
+                                              AcosCases<f32, false>(),
+                                              AcosCases<f16, false>()))));
+
+TEST_F(ResolverConstEvalBuiltinTest, Acos_OutsideRange_Positive) {
+    auto* expr = Call(Source{{12, 24}}, "acos", Expr(1.1_a));
+
+    GlobalConst("C", expr);
+    EXPECT_FALSE(r()->Resolve());
+    EXPECT_EQ(r()->error(), "12:24 error: acos must be called with a value in the range [-1, 1]");
+}
+
+TEST_F(ResolverConstEvalBuiltinTest, Acos_OutsideRange_Negative) {
+    auto* expr = Call(Source{{12, 24}}, "acos", Negation(1.1_a));
+
+    GlobalConst("C", expr);
+    EXPECT_FALSE(r()->Resolve());
+    EXPECT_EQ(r()->error(), "12:24 error: acos must be called with a value in the range [-1, 1]");
+}
+
+TEST_F(ResolverConstEvalBuiltinTest, Acos_OutsideRange_Positive_INF) {
+    auto* expr = Call(Source{{12, 24}}, "acos", Expr(f32::Inf()));
+
+    GlobalConst("C", expr);
+    EXPECT_FALSE(r()->Resolve());
+    EXPECT_EQ(r()->error(), "12:24 error: acos must be called with a value in the range [-1, 1]");
+}
+
+TEST_F(ResolverConstEvalBuiltinTest, Acos_OutsideRange_Negative_INF) {
+    auto* expr = Call(Source{{12, 24}}, "acos", Negation(f32::Inf()));
+
+    GlobalConst("C", expr);
+    EXPECT_FALSE(r()->Resolve());
+    EXPECT_EQ(r()->error(), "12:24 error: acos must be called with a value in the range [-1, 1]");
+}
+
 template <typename T, bool finite_only>
 std::vector<Case> AsinCases() {
     std::vector<Case> cases = {

src/tint/resolver/intrinsic_table.inl

@@ -13473,24 +13473,24 @@ constexpr OverloadInfo kOverloads[] = {
     /* num parameters */ 1,
     /* num template types */ 1,
     /* num template numbers */ 0,
-    /* template types */ &kTemplateTypes[22],
+    /* template types */ &kTemplateTypes[23],
     /* template numbers */ &kTemplateNumbers[10],
     /* parameters */ &kParameters[934],
     /* return matcher indices */ &kMatcherIndices[1],
     /* flags */ OverloadFlags(OverloadFlag::kIsBuiltin, OverloadFlag::kSupportsVertexPipeline, OverloadFlag::kSupportsFragmentPipeline, OverloadFlag::kSupportsComputePipeline),
-    /* const eval */ nullptr,
+    /* const eval */ &ConstEval::acos,
   },
   {
     /* [429] */
     /* num parameters */ 1,
     /* num template types */ 1,
     /* num template numbers */ 1,
-    /* template types */ &kTemplateTypes[22],
+    /* template types */ &kTemplateTypes[23],
     /* template numbers */ &kTemplateNumbers[6],
     /* parameters */ &kParameters[946],
     /* return matcher indices */ &kMatcherIndices[30],
     /* flags */ OverloadFlags(OverloadFlag::kIsBuiltin, OverloadFlag::kSupportsVertexPipeline, OverloadFlag::kSupportsFragmentPipeline, OverloadFlag::kSupportsComputePipeline),
-    /* const eval */ nullptr,
+    /* const eval */ &ConstEval::acos,
   },
   {
     /* [430] */
@@ -14020,8 +14020,8 @@ constexpr IntrinsicInfo kBuiltins[] = {
   },
   {
     /* [1] */
-    /* fn acos<T : f32_f16>(T) -> T */
+    /* fn acos<T : fa_f32_f16>(@test_value(0.87758256189) T) -> T */
-    /* fn acos<N : num, T : f32_f16>(vec<N, T>) -> vec<N, T> */
+    /* fn acos<N : num, T : fa_f32_f16>(@test_value(0.87758256189) vec<N, T>) -> vec<N, T> */
     /* num overloads */ 2,
     /* overloads */ &kOverloads[428],
   },

test/tint/builtins/gen/literal/acos/004aff.wgsl.expected.dxc.hlsl

@@ -1,5 +1,5 @@
 void acos_004aff() {
-  vector<float16_t, 2> res = acos((float16_t(0.0h)).xx);
+  vector<float16_t, 2> res = (float16_t(1.5703125h)).xx;
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/acos/004aff.wgsl.expected.glsl

@@ -2,7 +2,7 @@
 #extension GL_AMD_gpu_shader_half_float : require
 
 void acos_004aff() {
-  f16vec2 res = acos(f16vec2(0.0hf));
+  f16vec2 res = f16vec2(1.5703125hf);
 }
 
 vec4 vertex_main() {
@@ -23,7 +23,7 @@ void main() {
 precision mediump float;
 
 void acos_004aff() {
-  f16vec2 res = acos(f16vec2(0.0hf));
+  f16vec2 res = f16vec2(1.5703125hf);
 }
 
 void fragment_main() {
@@ -38,7 +38,7 @@ void main() {
 #extension GL_AMD_gpu_shader_half_float : require
 
 void acos_004aff() {
-  f16vec2 res = acos(f16vec2(0.0hf));
+  f16vec2 res = f16vec2(1.5703125hf);
 }
 
 void compute_main() {

test/tint/builtins/gen/literal/acos/004aff.wgsl.expected.msl

@@ -2,7 +2,7 @@
 
 using namespace metal;
 void acos_004aff() {
-  half2 res = acos(half2(0.0h));
+  half2 res = half2(1.5703125h);
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/acos/004aff.wgsl.expected.spvasm

@@ -8,7 +8,6 @@
                OpCapability UniformAndStorageBuffer16BitAccess
                OpCapability StorageBuffer16BitAccess
                OpCapability StorageInputOutput16
-         %16 = OpExtInstImport "GLSL.std.450"
                OpMemoryModel Logical GLSL450
                OpEntryPoint Vertex %vertex_main "vertex_main" %value %vertex_point_size
                OpEntryPoint Fragment %fragment_main "fragment_main"
@@ -37,15 +36,16 @@
           %9 = OpTypeFunction %void
        %half = OpTypeFloat 16
      %v2half = OpTypeVector %half 2
-         %17 = OpConstantNull %v2half
+%half_0x1_92p_0 = OpConstant %half 0x1.92p+0
+         %16 = OpConstantComposite %v2half %half_0x1_92p_0 %half_0x1_92p_0
 %_ptr_Function_v2half = OpTypePointer Function %v2half
+         %19 = OpConstantNull %v2half
          %20 = OpTypeFunction %v4float
     %float_1 = OpConstant %float 1
 %acos_004aff = OpFunction %void None %9
          %12 = OpLabel
-        %res = OpVariable %_ptr_Function_v2half Function %17
+        %res = OpVariable %_ptr_Function_v2half Function %19
-         %13 = OpExtInst %v2half %16 Acos %17
+               OpStore %res %16
-               OpStore %res %13
                OpReturn
                OpFunctionEnd
 %vertex_main_inner = OpFunction %v4float None %20

test/tint/builtins/gen/literal/acos/069188.wgsl

@@ -0,0 +1,43 @@
+// Copyright 2022 The Tint Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+////////////////////////////////////////////////////////////////////////////////
+// File generated by tools/src/cmd/gen
+// using the template:
+//   test/tint/builtins/gen/gen.wgsl.tmpl
+//
+// Do not modify this file directly
+////////////////////////////////////////////////////////////////////////////////
+
+
+// fn acos(vec<3, fa>) -> vec<3, fa>
+fn acos_069188() {
+  var res = acos(vec3(0.87758256189));
+}
+
+@vertex
+fn vertex_main() -> @builtin(position) vec4<f32> {
+  acos_069188();
+  return vec4<f32>();
+}
+
+@fragment
+fn fragment_main() {
+  acos_069188();
+}
+
+@compute @workgroup_size(1)
+fn compute_main() {
+  acos_069188();
+}

test/tint/builtins/gen/literal/acos/069188.wgsl.expected.dxc.hlsl

@@ -0,0 +1,30 @@
+void acos_069188() {
+  float3 res = (0.5f).xxx;
+}
+
+struct tint_symbol {
+  float4 value : SV_Position;
+};
+
+float4 vertex_main_inner() {
+  acos_069188();
+  return (0.0f).xxxx;
+}
+
+tint_symbol vertex_main() {
+  const float4 inner_result = vertex_main_inner();
+  tint_symbol wrapper_result = (tint_symbol)0;
+  wrapper_result.value = inner_result;
+  return wrapper_result;
+}
+
+void fragment_main() {
+  acos_069188();
+  return;
+}
+
+[numthreads(1, 1, 1)]
+void compute_main() {
+  acos_069188();
+  return;
+}

test/tint/builtins/gen/literal/acos/069188.wgsl.expected.fxc.hlsl

@@ -0,0 +1,30 @@
+void acos_069188() {
+  float3 res = (0.5f).xxx;
+}
+
+struct tint_symbol {
+  float4 value : SV_Position;
+};
+
+float4 vertex_main_inner() {
+  acos_069188();
+  return (0.0f).xxxx;
+}
+
+tint_symbol vertex_main() {
+  const float4 inner_result = vertex_main_inner();
+  tint_symbol wrapper_result = (tint_symbol)0;
+  wrapper_result.value = inner_result;
+  return wrapper_result;
+}
+
+void fragment_main() {
+  acos_069188();
+  return;
+}
+
+[numthreads(1, 1, 1)]
+void compute_main() {
+  acos_069188();
+  return;
+}

test/tint/builtins/gen/literal/acos/069188.wgsl.expected.glsl

@@ -0,0 +1,49 @@
+#version 310 es
+
+void acos_069188() {
+  vec3 res = vec3(0.5f);
+}
+
+vec4 vertex_main() {
+  acos_069188();
+  return vec4(0.0f);
+}
+
+void main() {
+  gl_PointSize = 1.0;
+  vec4 inner_result = vertex_main();
+  gl_Position = inner_result;
+  gl_Position.y = -(gl_Position.y);
+  gl_Position.z = ((2.0f * gl_Position.z) - gl_Position.w);
+  return;
+}
+#version 310 es
+precision mediump float;
+
+void acos_069188() {
+  vec3 res = vec3(0.5f);
+}
+
+void fragment_main() {
+  acos_069188();
+}
+
+void main() {
+  fragment_main();
+  return;
+}
+#version 310 es
+
+void acos_069188() {
+  vec3 res = vec3(0.5f);
+}
+
+void compute_main() {
+  acos_069188();
+}
+
+layout(local_size_x = 1, local_size_y = 1, local_size_z = 1) in;
+void main() {
+  compute_main();
+  return;
+}

test/tint/builtins/gen/literal/acos/069188.wgsl.expected.msl

@@ -0,0 +1,33 @@
+#include <metal_stdlib>
+
+using namespace metal;
+void acos_069188() {
+  float3 res = float3(0.5f);
+}
+
+struct tint_symbol {
+  float4 value [[position]];
+};
+
+float4 vertex_main_inner() {
+  acos_069188();
+  return float4(0.0f);
+}
+
+vertex tint_symbol vertex_main() {
+  float4 const inner_result = vertex_main_inner();
+  tint_symbol wrapper_result = {};
+  wrapper_result.value = inner_result;
+  return wrapper_result;
+}
+
+fragment void fragment_main() {
+  acos_069188();
+  return;
+}
+
+kernel void compute_main() {
+  acos_069188();
+  return;
+}
+

test/tint/builtins/gen/literal/acos/069188.wgsl.expected.spvasm

@@ -0,0 +1,67 @@
+; SPIR-V
+; Version: 1.3
+; Generator: Google Tint Compiler; 0
+; Bound: 33
+; Schema: 0
+               OpCapability Shader
+               OpMemoryModel Logical GLSL450
+               OpEntryPoint Vertex %vertex_main "vertex_main" %value %vertex_point_size
+               OpEntryPoint Fragment %fragment_main "fragment_main"
+               OpEntryPoint GLCompute %compute_main "compute_main"
+               OpExecutionMode %fragment_main OriginUpperLeft
+               OpExecutionMode %compute_main LocalSize 1 1 1
+               OpName %value "value"
+               OpName %vertex_point_size "vertex_point_size"
+               OpName %acos_069188 "acos_069188"
+               OpName %res "res"
+               OpName %vertex_main_inner "vertex_main_inner"
+               OpName %vertex_main "vertex_main"
+               OpName %fragment_main "fragment_main"
+               OpName %compute_main "compute_main"
+               OpDecorate %value BuiltIn Position
+               OpDecorate %vertex_point_size BuiltIn PointSize
+      %float = OpTypeFloat 32
+    %v4float = OpTypeVector %float 4
+%_ptr_Output_v4float = OpTypePointer Output %v4float
+          %5 = OpConstantNull %v4float
+      %value = OpVariable %_ptr_Output_v4float Output %5
+%_ptr_Output_float = OpTypePointer Output %float
+          %8 = OpConstantNull %float
+%vertex_point_size = OpVariable %_ptr_Output_float Output %8
+       %void = OpTypeVoid
+          %9 = OpTypeFunction %void
+    %v3float = OpTypeVector %float 3
+  %float_0_5 = OpConstant %float 0.5
+         %15 = OpConstantComposite %v3float %float_0_5 %float_0_5 %float_0_5
+%_ptr_Function_v3float = OpTypePointer Function %v3float
+         %18 = OpConstantNull %v3float
+         %19 = OpTypeFunction %v4float
+    %float_1 = OpConstant %float 1
+%acos_069188 = OpFunction %void None %9
+         %12 = OpLabel
+        %res = OpVariable %_ptr_Function_v3float Function %18
+               OpStore %res %15
+               OpReturn
+               OpFunctionEnd
+%vertex_main_inner = OpFunction %v4float None %19
+         %21 = OpLabel
+         %22 = OpFunctionCall %void %acos_069188
+               OpReturnValue %5
+               OpFunctionEnd
+%vertex_main = OpFunction %void None %9
+         %24 = OpLabel
+         %25 = OpFunctionCall %v4float %vertex_main_inner
+               OpStore %value %25
+               OpStore %vertex_point_size %float_1
+               OpReturn
+               OpFunctionEnd
+%fragment_main = OpFunction %void None %9
+         %28 = OpLabel
+         %29 = OpFunctionCall %void %acos_069188
+               OpReturn
+               OpFunctionEnd
+%compute_main = OpFunction %void None %9
+         %31 = OpLabel
+         %32 = OpFunctionCall %void %acos_069188
+               OpReturn
+               OpFunctionEnd

test/tint/builtins/gen/literal/acos/069188.wgsl.expected.wgsl

@@ -0,0 +1,19 @@
+fn acos_069188() {
+  var res = acos(vec3(0.87758256188999995));
+}
+
+@vertex
+fn vertex_main() -> @builtin(position) vec4<f32> {
+  acos_069188();
+  return vec4<f32>();
+}
+
+@fragment
+fn fragment_main() {
+  acos_069188();
+}
+
+@compute @workgroup_size(1)
+fn compute_main() {
+  acos_069188();
+}

test/tint/builtins/gen/literal/acos/15d35b.wgsl

@@ -0,0 +1,43 @@
+// Copyright 2022 The Tint Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+////////////////////////////////////////////////////////////////////////////////
+// File generated by tools/src/cmd/gen
+// using the template:
+//   test/tint/builtins/gen/gen.wgsl.tmpl
+//
+// Do not modify this file directly
+////////////////////////////////////////////////////////////////////////////////
+
+
+// fn acos(vec<2, fa>) -> vec<2, fa>
+fn acos_15d35b() {
+  var res = acos(vec2(0.87758256189));
+}
+
+@vertex
+fn vertex_main() -> @builtin(position) vec4<f32> {
+  acos_15d35b();
+  return vec4<f32>();
+}
+
+@fragment
+fn fragment_main() {
+  acos_15d35b();
+}
+
+@compute @workgroup_size(1)
+fn compute_main() {
+  acos_15d35b();
+}

test/tint/builtins/gen/literal/acos/15d35b.wgsl.expected.dxc.hlsl

@@ -0,0 +1,30 @@
+void acos_15d35b() {
+  float2 res = (0.5f).xx;
+}
+
+struct tint_symbol {
+  float4 value : SV_Position;
+};
+
+float4 vertex_main_inner() {
+  acos_15d35b();
+  return (0.0f).xxxx;
+}
+
+tint_symbol vertex_main() {
+  const float4 inner_result = vertex_main_inner();
+  tint_symbol wrapper_result = (tint_symbol)0;
+  wrapper_result.value = inner_result;
+  return wrapper_result;
+}
+
+void fragment_main() {
+  acos_15d35b();
+  return;
+}
+
+[numthreads(1, 1, 1)]
+void compute_main() {
+  acos_15d35b();
+  return;
+}

test/tint/builtins/gen/literal/acos/15d35b.wgsl.expected.fxc.hlsl

@@ -0,0 +1,30 @@
+void acos_15d35b() {
+  float2 res = (0.5f).xx;
+}
+
+struct tint_symbol {
+  float4 value : SV_Position;
+};
+
+float4 vertex_main_inner() {
+  acos_15d35b();
+  return (0.0f).xxxx;
+}
+
+tint_symbol vertex_main() {
+  const float4 inner_result = vertex_main_inner();
+  tint_symbol wrapper_result = (tint_symbol)0;
+  wrapper_result.value = inner_result;
+  return wrapper_result;
+}
+
+void fragment_main() {
+  acos_15d35b();
+  return;
+}
+
+[numthreads(1, 1, 1)]
+void compute_main() {
+  acos_15d35b();
+  return;
+}

test/tint/builtins/gen/literal/acos/15d35b.wgsl.expected.glsl

@@ -0,0 +1,49 @@
+#version 310 es
+
+void acos_15d35b() {
+  vec2 res = vec2(0.5f);
+}
+
+vec4 vertex_main() {
+  acos_15d35b();
+  return vec4(0.0f);
+}
+
+void main() {
+  gl_PointSize = 1.0;
+  vec4 inner_result = vertex_main();
+  gl_Position = inner_result;
+  gl_Position.y = -(gl_Position.y);
+  gl_Position.z = ((2.0f * gl_Position.z) - gl_Position.w);
+  return;
+}
+#version 310 es
+precision mediump float;
+
+void acos_15d35b() {
+  vec2 res = vec2(0.5f);
+}
+
+void fragment_main() {
+  acos_15d35b();
+}
+
+void main() {
+  fragment_main();
+  return;
+}
+#version 310 es
+
+void acos_15d35b() {
+  vec2 res = vec2(0.5f);
+}
+
+void compute_main() {
+  acos_15d35b();
+}
+
+layout(local_size_x = 1, local_size_y = 1, local_size_z = 1) in;
+void main() {
+  compute_main();
+  return;
+}

test/tint/builtins/gen/literal/acos/15d35b.wgsl.expected.msl

@@ -0,0 +1,33 @@
+#include <metal_stdlib>
+
+using namespace metal;
+void acos_15d35b() {
+  float2 res = float2(0.5f);
+}
+
+struct tint_symbol {
+  float4 value [[position]];
+};
+
+float4 vertex_main_inner() {
+  acos_15d35b();
+  return float4(0.0f);
+}
+
+vertex tint_symbol vertex_main() {
+  float4 const inner_result = vertex_main_inner();
+  tint_symbol wrapper_result = {};
+  wrapper_result.value = inner_result;
+  return wrapper_result;
+}
+
+fragment void fragment_main() {
+  acos_15d35b();
+  return;
+}
+
+kernel void compute_main() {
+  acos_15d35b();
+  return;
+}
+

test/tint/builtins/gen/literal/acos/15d35b.wgsl.expected.spvasm

@@ -0,0 +1,67 @@
+; SPIR-V
+; Version: 1.3
+; Generator: Google Tint Compiler; 0
+; Bound: 33
+; Schema: 0
+               OpCapability Shader
+               OpMemoryModel Logical GLSL450
+               OpEntryPoint Vertex %vertex_main "vertex_main" %value %vertex_point_size
+               OpEntryPoint Fragment %fragment_main "fragment_main"
+               OpEntryPoint GLCompute %compute_main "compute_main"
+               OpExecutionMode %fragment_main OriginUpperLeft
+               OpExecutionMode %compute_main LocalSize 1 1 1
+               OpName %value "value"
+               OpName %vertex_point_size "vertex_point_size"
+               OpName %acos_15d35b "acos_15d35b"
+               OpName %res "res"
+               OpName %vertex_main_inner "vertex_main_inner"
+               OpName %vertex_main "vertex_main"
+               OpName %fragment_main "fragment_main"
+               OpName %compute_main "compute_main"
+               OpDecorate %value BuiltIn Position
+               OpDecorate %vertex_point_size BuiltIn PointSize
+      %float = OpTypeFloat 32
+    %v4float = OpTypeVector %float 4
+%_ptr_Output_v4float = OpTypePointer Output %v4float
+          %5 = OpConstantNull %v4float
+      %value = OpVariable %_ptr_Output_v4float Output %5
+%_ptr_Output_float = OpTypePointer Output %float
+          %8 = OpConstantNull %float
+%vertex_point_size = OpVariable %_ptr_Output_float Output %8
+       %void = OpTypeVoid
+          %9 = OpTypeFunction %void
+    %v2float = OpTypeVector %float 2
+  %float_0_5 = OpConstant %float 0.5
+         %15 = OpConstantComposite %v2float %float_0_5 %float_0_5
+%_ptr_Function_v2float = OpTypePointer Function %v2float
+         %18 = OpConstantNull %v2float
+         %19 = OpTypeFunction %v4float
+    %float_1 = OpConstant %float 1
+%acos_15d35b = OpFunction %void None %9
+         %12 = OpLabel
+        %res = OpVariable %_ptr_Function_v2float Function %18
+               OpStore %res %15
+               OpReturn
+               OpFunctionEnd
+%vertex_main_inner = OpFunction %v4float None %19
+         %21 = OpLabel
+         %22 = OpFunctionCall %void %acos_15d35b
+               OpReturnValue %5
+               OpFunctionEnd
+%vertex_main = OpFunction %void None %9
+         %24 = OpLabel
+         %25 = OpFunctionCall %v4float %vertex_main_inner
+               OpStore %value %25
+               OpStore %vertex_point_size %float_1
+               OpReturn
+               OpFunctionEnd
+%fragment_main = OpFunction %void None %9
+         %28 = OpLabel
+         %29 = OpFunctionCall %void %acos_15d35b
+               OpReturn
+               OpFunctionEnd
+%compute_main = OpFunction %void None %9
+         %31 = OpLabel
+         %32 = OpFunctionCall %void %acos_15d35b
+               OpReturn
+               OpFunctionEnd

test/tint/builtins/gen/literal/acos/15d35b.wgsl.expected.wgsl

@@ -0,0 +1,19 @@
+fn acos_15d35b() {
+  var res = acos(vec2(0.87758256188999995));
+}
+
+@vertex
+fn vertex_main() -> @builtin(position) vec4<f32> {
+  acos_15d35b();
+  return vec4<f32>();
+}
+
+@fragment
+fn fragment_main() {
+  acos_15d35b();
+}
+
+@compute @workgroup_size(1)
+fn compute_main() {
+  acos_15d35b();
+}

test/tint/builtins/gen/literal/acos/203628.wgsl.expected.dxc.hlsl

@@ -1,5 +1,5 @@
 void acos_203628() {
-  vector<float16_t, 4> res = acos((float16_t(0.0h)).xxxx);
+  vector<float16_t, 4> res = (float16_t(1.5703125h)).xxxx;
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/acos/203628.wgsl.expected.glsl

@@ -2,7 +2,7 @@
 #extension GL_AMD_gpu_shader_half_float : require
 
 void acos_203628() {
-  f16vec4 res = acos(f16vec4(0.0hf));
+  f16vec4 res = f16vec4(1.5703125hf);
 }
 
 vec4 vertex_main() {
@@ -23,7 +23,7 @@ void main() {
 precision mediump float;
 
 void acos_203628() {
-  f16vec4 res = acos(f16vec4(0.0hf));
+  f16vec4 res = f16vec4(1.5703125hf);
 }
 
 void fragment_main() {
@@ -38,7 +38,7 @@ void main() {
 #extension GL_AMD_gpu_shader_half_float : require
 
 void acos_203628() {
-  f16vec4 res = acos(f16vec4(0.0hf));
+  f16vec4 res = f16vec4(1.5703125hf);
 }
 
 void compute_main() {

test/tint/builtins/gen/literal/acos/203628.wgsl.expected.msl

@@ -2,7 +2,7 @@
 
 using namespace metal;
 void acos_203628() {
-  half4 res = acos(half4(0.0h));
+  half4 res = half4(1.5703125h);
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/acos/203628.wgsl.expected.spvasm

@@ -8,7 +8,6 @@
                OpCapability UniformAndStorageBuffer16BitAccess
                OpCapability StorageBuffer16BitAccess
                OpCapability StorageInputOutput16
-         %16 = OpExtInstImport "GLSL.std.450"
                OpMemoryModel Logical GLSL450
                OpEntryPoint Vertex %vertex_main "vertex_main" %value %vertex_point_size
                OpEntryPoint Fragment %fragment_main "fragment_main"
@@ -37,15 +36,16 @@
           %9 = OpTypeFunction %void
        %half = OpTypeFloat 16
      %v4half = OpTypeVector %half 4
-         %17 = OpConstantNull %v4half
+%half_0x1_92p_0 = OpConstant %half 0x1.92p+0
+         %16 = OpConstantComposite %v4half %half_0x1_92p_0 %half_0x1_92p_0 %half_0x1_92p_0 %half_0x1_92p_0
 %_ptr_Function_v4half = OpTypePointer Function %v4half
+         %19 = OpConstantNull %v4half
          %20 = OpTypeFunction %v4float
     %float_1 = OpConstant %float 1
 %acos_203628 = OpFunction %void None %9
          %12 = OpLabel
-        %res = OpVariable %_ptr_Function_v4half Function %17
+        %res = OpVariable %_ptr_Function_v4half Function %19
-         %13 = OpExtInst %v4half %16 Acos %17
+               OpStore %res %16
-               OpStore %res %13
                OpReturn
                OpFunctionEnd
 %vertex_main_inner = OpFunction %v4float None %20

test/tint/builtins/gen/literal/acos/303e3d.wgsl.expected.dxc.hlsl

@@ -1,5 +1,5 @@
 void acos_303e3d() {
-  float16_t res = acos(float16_t(0.0h));
+  float16_t res = float16_t(1.5703125h);
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/acos/303e3d.wgsl.expected.glsl

@@ -2,7 +2,7 @@
 #extension GL_AMD_gpu_shader_half_float : require
 
 void acos_303e3d() {
-  float16_t res = acos(0.0hf);
+  float16_t res = 1.5703125hf;
 }
 
 vec4 vertex_main() {
@@ -23,7 +23,7 @@ void main() {
 precision mediump float;
 
 void acos_303e3d() {
-  float16_t res = acos(0.0hf);
+  float16_t res = 1.5703125hf;
 }
 
 void fragment_main() {
@@ -38,7 +38,7 @@ void main() {
 #extension GL_AMD_gpu_shader_half_float : require
 
 void acos_303e3d() {
-  float16_t res = acos(0.0hf);
+  float16_t res = 1.5703125hf;
 }
 
 void compute_main() {

test/tint/builtins/gen/literal/acos/303e3d.wgsl.expected.msl

@@ -2,7 +2,7 @@
 
 using namespace metal;
 void acos_303e3d() {
-  half res = acos(0.0h);
+  half res = 1.5703125h;
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/acos/303e3d.wgsl.expected.spvasm

@@ -1,14 +1,13 @@
 ; SPIR-V
 ; Version: 1.3
 ; Generator: Google Tint Compiler; 0
-; Bound: 33
+; Bound: 32
 ; Schema: 0
                OpCapability Shader
                OpCapability Float16
                OpCapability UniformAndStorageBuffer16BitAccess
                OpCapability StorageBuffer16BitAccess
                OpCapability StorageInputOutput16
-         %15 = OpExtInstImport "GLSL.std.450"
                OpMemoryModel Logical GLSL450
                OpEntryPoint Vertex %vertex_main "vertex_main" %value %vertex_point_size
                OpEntryPoint Fragment %fragment_main "fragment_main"
@@ -36,36 +35,36 @@
        %void = OpTypeVoid
           %9 = OpTypeFunction %void
        %half = OpTypeFloat 16
-         %16 = OpConstantNull %half
+%half_0x1_92p_0 = OpConstant %half 0x1.92p+0
 %_ptr_Function_half = OpTypePointer Function %half
-         %19 = OpTypeFunction %v4float
+         %17 = OpConstantNull %half
+         %18 = OpTypeFunction %v4float
     %float_1 = OpConstant %float 1
 %acos_303e3d = OpFunction %void None %9
          %12 = OpLabel
-        %res = OpVariable %_ptr_Function_half Function %16
+        %res = OpVariable %_ptr_Function_half Function %17
-         %13 = OpExtInst %half %15 Acos %16
+               OpStore %res %half_0x1_92p_0
-               OpStore %res %13
                OpReturn
                OpFunctionEnd
-%vertex_main_inner = OpFunction %v4float None %19
+%vertex_main_inner = OpFunction %v4float None %18
-         %21 = OpLabel
+         %20 = OpLabel
-         %22 = OpFunctionCall %void %acos_303e3d
+         %21 = OpFunctionCall %void %acos_303e3d
                OpReturnValue %5
                OpFunctionEnd
 %vertex_main = OpFunction %void None %9
-         %24 = OpLabel
+         %23 = OpLabel
-         %25 = OpFunctionCall %v4float %vertex_main_inner
+         %24 = OpFunctionCall %v4float %vertex_main_inner
-               OpStore %value %25
+               OpStore %value %24
                OpStore %vertex_point_size %float_1
                OpReturn
                OpFunctionEnd
 %fragment_main = OpFunction %void None %9
-         %28 = OpLabel
+         %27 = OpLabel
-         %29 = OpFunctionCall %void %acos_303e3d
+         %28 = OpFunctionCall %void %acos_303e3d
                OpReturn
                OpFunctionEnd
 %compute_main = OpFunction %void None %9
-         %31 = OpLabel
+         %30 = OpLabel
-         %32 = OpFunctionCall %void %acos_303e3d
+         %31 = OpFunctionCall %void %acos_303e3d
                OpReturn
                OpFunctionEnd

test/tint/builtins/gen/literal/acos/489247.wgsl

@@ -23,7 +23,7 @@
 
 // fn acos(f32) -> f32
 fn acos_489247() {
-  var res: f32 = acos(1.f);
+  var res: f32 = acos(0.87758256189f);
 }
 
 @vertex

test/tint/builtins/gen/literal/acos/489247.wgsl.expected.dxc.hlsl

@@ -1,5 +1,5 @@
 void acos_489247() {
-  float res = acos(1.0f);
+  float res = 0.5f;
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/acos/489247.wgsl.expected.fxc.hlsl

@@ -1,5 +1,5 @@
 void acos_489247() {
-  float res = acos(1.0f);
+  float res = 0.5f;
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/acos/489247.wgsl.expected.glsl

@@ -1,7 +1,7 @@
 #version 310 es
 
 void acos_489247() {
-  float res = acos(1.0f);
+  float res = 0.5f;
 }
 
 vec4 vertex_main() {
@@ -21,7 +21,7 @@ void main() {
 precision mediump float;
 
 void acos_489247() {
-  float res = acos(1.0f);
+  float res = 0.5f;
 }
 
 void fragment_main() {
@@ -35,7 +35,7 @@ void main() {
 #version 310 es
 
 void acos_489247() {
-  float res = acos(1.0f);
+  float res = 0.5f;
 }
 
 void compute_main() {

test/tint/builtins/gen/literal/acos/489247.wgsl.expected.msl

@@ -2,7 +2,7 @@
 
 using namespace metal;
 void acos_489247() {
-  float res = acos(1.0f);
+  float res = 0.5f;
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/acos/489247.wgsl.expected.spvasm

@@ -1,10 +1,9 @@
 ; SPIR-V
 ; Version: 1.3
 ; Generator: Google Tint Compiler; 0
-; Bound: 31
+; Bound: 30
 ; Schema: 0
                OpCapability Shader
-         %14 = OpExtInstImport "GLSL.std.450"
                OpMemoryModel Logical GLSL450
                OpEntryPoint Vertex %vertex_main "vertex_main" %value %vertex_point_size
                OpEntryPoint Fragment %fragment_main "fragment_main"
@@ -31,35 +30,35 @@
 %vertex_point_size = OpVariable %_ptr_Output_float Output %8
        %void = OpTypeVoid
           %9 = OpTypeFunction %void
-    %float_1 = OpConstant %float 1
+  %float_0_5 = OpConstant %float 0.5
 %_ptr_Function_float = OpTypePointer Function %float
-         %18 = OpTypeFunction %v4float
+         %16 = OpTypeFunction %v4float
+    %float_1 = OpConstant %float 1
 %acos_489247 = OpFunction %void None %9
          %12 = OpLabel
         %res = OpVariable %_ptr_Function_float Function %8
-         %13 = OpExtInst %float %14 Acos %float_1
+               OpStore %res %float_0_5
-               OpStore %res %13
                OpReturn
                OpFunctionEnd
-%vertex_main_inner = OpFunction %v4float None %18
+%vertex_main_inner = OpFunction %v4float None %16
-         %20 = OpLabel
+         %18 = OpLabel
-         %21 = OpFunctionCall %void %acos_489247
+         %19 = OpFunctionCall %void %acos_489247
                OpReturnValue %5
                OpFunctionEnd
 %vertex_main = OpFunction %void None %9
-         %23 = OpLabel
+         %21 = OpLabel
-         %24 = OpFunctionCall %v4float %vertex_main_inner
+         %22 = OpFunctionCall %v4float %vertex_main_inner
-               OpStore %value %24
+               OpStore %value %22
                OpStore %vertex_point_size %float_1
                OpReturn
                OpFunctionEnd
 %fragment_main = OpFunction %void None %9
-         %26 = OpLabel
+         %25 = OpLabel
-         %27 = OpFunctionCall %void %acos_489247
+         %26 = OpFunctionCall %void %acos_489247
                OpReturn
                OpFunctionEnd
 %compute_main = OpFunction %void None %9
-         %29 = OpLabel
+         %28 = OpLabel
-         %30 = OpFunctionCall %void %acos_489247
+         %29 = OpFunctionCall %void %acos_489247
                OpReturn
                OpFunctionEnd

test/tint/builtins/gen/literal/acos/489247.wgsl.expected.wgsl

@@ -1,5 +1,5 @@
 fn acos_489247() {
-  var res : f32 = acos(1.0f);
+  var res : f32 = acos(0.87758255f);
 }
 
 @vertex

test/tint/builtins/gen/literal/acos/4dac75.wgsl

@@ -0,0 +1,43 @@
+// Copyright 2022 The Tint Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+////////////////////////////////////////////////////////////////////////////////
+// File generated by tools/src/cmd/gen
+// using the template:
+//   test/tint/builtins/gen/gen.wgsl.tmpl
+//
+// Do not modify this file directly
+////////////////////////////////////////////////////////////////////////////////
+
+
+// fn acos(vec<4, fa>) -> vec<4, fa>
+fn acos_4dac75() {
+  var res = acos(vec4(0.87758256189));
+}
+
+@vertex
+fn vertex_main() -> @builtin(position) vec4<f32> {
+  acos_4dac75();
+  return vec4<f32>();
+}
+
+@fragment
+fn fragment_main() {
+  acos_4dac75();
+}
+
+@compute @workgroup_size(1)
+fn compute_main() {
+  acos_4dac75();
+}

test/tint/builtins/gen/literal/acos/4dac75.wgsl.expected.dxc.hlsl

@@ -0,0 +1,30 @@
+void acos_4dac75() {
+  float4 res = (0.5f).xxxx;
+}
+
+struct tint_symbol {
+  float4 value : SV_Position;
+};
+
+float4 vertex_main_inner() {
+  acos_4dac75();
+  return (0.0f).xxxx;
+}
+
+tint_symbol vertex_main() {
+  const float4 inner_result = vertex_main_inner();
+  tint_symbol wrapper_result = (tint_symbol)0;
+  wrapper_result.value = inner_result;
+  return wrapper_result;
+}
+
+void fragment_main() {
+  acos_4dac75();
+  return;
+}
+
+[numthreads(1, 1, 1)]
+void compute_main() {
+  acos_4dac75();
+  return;
+}

test/tint/builtins/gen/literal/acos/4dac75.wgsl.expected.fxc.hlsl

@@ -0,0 +1,30 @@
+void acos_4dac75() {
+  float4 res = (0.5f).xxxx;
+}
+
+struct tint_symbol {
+  float4 value : SV_Position;
+};
+
+float4 vertex_main_inner() {
+  acos_4dac75();
+  return (0.0f).xxxx;
+}
+
+tint_symbol vertex_main() {
+  const float4 inner_result = vertex_main_inner();
+  tint_symbol wrapper_result = (tint_symbol)0;
+  wrapper_result.value = inner_result;
+  return wrapper_result;
+}
+
+void fragment_main() {
+  acos_4dac75();
+  return;
+}
+
+[numthreads(1, 1, 1)]
+void compute_main() {
+  acos_4dac75();
+  return;
+}

test/tint/builtins/gen/literal/acos/4dac75.wgsl.expected.glsl

@@ -0,0 +1,49 @@
+#version 310 es
+
+void acos_4dac75() {
+  vec4 res = vec4(0.5f);
+}
+
+vec4 vertex_main() {
+  acos_4dac75();
+  return vec4(0.0f);
+}
+
+void main() {
+  gl_PointSize = 1.0;
+  vec4 inner_result = vertex_main();
+  gl_Position = inner_result;
+  gl_Position.y = -(gl_Position.y);
+  gl_Position.z = ((2.0f * gl_Position.z) - gl_Position.w);
+  return;
+}
+#version 310 es
+precision mediump float;
+
+void acos_4dac75() {
+  vec4 res = vec4(0.5f);
+}
+
+void fragment_main() {
+  acos_4dac75();
+}
+
+void main() {
+  fragment_main();
+  return;
+}
+#version 310 es
+
+void acos_4dac75() {
+  vec4 res = vec4(0.5f);
+}
+
+void compute_main() {
+  acos_4dac75();
+}
+
+layout(local_size_x = 1, local_size_y = 1, local_size_z = 1) in;
+void main() {
+  compute_main();
+  return;
+}

test/tint/builtins/gen/literal/acos/4dac75.wgsl.expected.msl

@@ -0,0 +1,33 @@
+#include <metal_stdlib>
+
+using namespace metal;
+void acos_4dac75() {
+  float4 res = float4(0.5f);
+}
+
+struct tint_symbol {
+  float4 value [[position]];
+};
+
+float4 vertex_main_inner() {
+  acos_4dac75();
+  return float4(0.0f);
+}
+
+vertex tint_symbol vertex_main() {
+  float4 const inner_result = vertex_main_inner();
+  tint_symbol wrapper_result = {};
+  wrapper_result.value = inner_result;
+  return wrapper_result;
+}
+
+fragment void fragment_main() {
+  acos_4dac75();
+  return;
+}
+
+kernel void compute_main() {
+  acos_4dac75();
+  return;
+}
+

test/tint/builtins/gen/literal/acos/4dac75.wgsl.expected.spvasm

@@ -0,0 +1,65 @@
+; SPIR-V
+; Version: 1.3
+; Generator: Google Tint Compiler; 0
+; Bound: 31
+; Schema: 0
+               OpCapability Shader
+               OpMemoryModel Logical GLSL450
+               OpEntryPoint Vertex %vertex_main "vertex_main" %value %vertex_point_size
+               OpEntryPoint Fragment %fragment_main "fragment_main"
+               OpEntryPoint GLCompute %compute_main "compute_main"
+               OpExecutionMode %fragment_main OriginUpperLeft
+               OpExecutionMode %compute_main LocalSize 1 1 1
+               OpName %value "value"
+               OpName %vertex_point_size "vertex_point_size"
+               OpName %acos_4dac75 "acos_4dac75"
+               OpName %res "res"
+               OpName %vertex_main_inner "vertex_main_inner"
+               OpName %vertex_main "vertex_main"
+               OpName %fragment_main "fragment_main"
+               OpName %compute_main "compute_main"
+               OpDecorate %value BuiltIn Position
+               OpDecorate %vertex_point_size BuiltIn PointSize
+      %float = OpTypeFloat 32
+    %v4float = OpTypeVector %float 4
+%_ptr_Output_v4float = OpTypePointer Output %v4float
+          %5 = OpConstantNull %v4float
+      %value = OpVariable %_ptr_Output_v4float Output %5
+%_ptr_Output_float = OpTypePointer Output %float
+          %8 = OpConstantNull %float
+%vertex_point_size = OpVariable %_ptr_Output_float Output %8
+       %void = OpTypeVoid
+          %9 = OpTypeFunction %void
+  %float_0_5 = OpConstant %float 0.5
+         %14 = OpConstantComposite %v4float %float_0_5 %float_0_5 %float_0_5 %float_0_5
+%_ptr_Function_v4float = OpTypePointer Function %v4float
+         %17 = OpTypeFunction %v4float
+    %float_1 = OpConstant %float 1
+%acos_4dac75 = OpFunction %void None %9
+         %12 = OpLabel
+        %res = OpVariable %_ptr_Function_v4float Function %5
+               OpStore %res %14
+               OpReturn
+               OpFunctionEnd
+%vertex_main_inner = OpFunction %v4float None %17
+         %19 = OpLabel
+         %20 = OpFunctionCall %void %acos_4dac75
+               OpReturnValue %5
+               OpFunctionEnd
+%vertex_main = OpFunction %void None %9
+         %22 = OpLabel
+         %23 = OpFunctionCall %v4float %vertex_main_inner
+               OpStore %value %23
+               OpStore %vertex_point_size %float_1
+               OpReturn
+               OpFunctionEnd
+%fragment_main = OpFunction %void None %9
+         %26 = OpLabel
+         %27 = OpFunctionCall %void %acos_4dac75
+               OpReturn
+               OpFunctionEnd
+%compute_main = OpFunction %void None %9
+         %29 = OpLabel
+         %30 = OpFunctionCall %void %acos_4dac75
+               OpReturn
+               OpFunctionEnd

test/tint/builtins/gen/literal/acos/4dac75.wgsl.expected.wgsl

@@ -0,0 +1,19 @@
+fn acos_4dac75() {
+  var res = acos(vec4(0.87758256188999995));
+}
+
+@vertex
+fn vertex_main() -> @builtin(position) vec4<f32> {
+  acos_4dac75();
+  return vec4<f32>();
+}
+
+@fragment
+fn fragment_main() {
+  acos_4dac75();
+}
+
+@compute @workgroup_size(1)
+fn compute_main() {
+  acos_4dac75();
+}

test/tint/builtins/gen/literal/acos/5e9ad2.wgsl

@@ -0,0 +1,43 @@
+// Copyright 2022 The Tint Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+////////////////////////////////////////////////////////////////////////////////
+// File generated by tools/src/cmd/gen
+// using the template:
+//   test/tint/builtins/gen/gen.wgsl.tmpl
+//
+// Do not modify this file directly
+////////////////////////////////////////////////////////////////////////////////
+
+
+// fn acos(fa) -> fa
+fn acos_5e9ad2() {
+  var res = acos(0.87758256189);
+}
+
+@vertex
+fn vertex_main() -> @builtin(position) vec4<f32> {
+  acos_5e9ad2();
+  return vec4<f32>();
+}
+
+@fragment
+fn fragment_main() {
+  acos_5e9ad2();
+}
+
+@compute @workgroup_size(1)
+fn compute_main() {
+  acos_5e9ad2();
+}

test/tint/builtins/gen/literal/acos/5e9ad2.wgsl.expected.dxc.hlsl

@@ -0,0 +1,30 @@
+void acos_5e9ad2() {
+  float res = 0.5f;
+}
+
+struct tint_symbol {
+  float4 value : SV_Position;
+};
+
+float4 vertex_main_inner() {
+  acos_5e9ad2();
+  return (0.0f).xxxx;
+}
+
+tint_symbol vertex_main() {
+  const float4 inner_result = vertex_main_inner();
+  tint_symbol wrapper_result = (tint_symbol)0;
+  wrapper_result.value = inner_result;
+  return wrapper_result;
+}
+
+void fragment_main() {
+  acos_5e9ad2();
+  return;
+}
+
+[numthreads(1, 1, 1)]
+void compute_main() {
+  acos_5e9ad2();
+  return;
+}

test/tint/builtins/gen/literal/acos/5e9ad2.wgsl.expected.fxc.hlsl

@@ -0,0 +1,30 @@
+void acos_5e9ad2() {
+  float res = 0.5f;
+}
+
+struct tint_symbol {
+  float4 value : SV_Position;
+};
+
+float4 vertex_main_inner() {
+  acos_5e9ad2();
+  return (0.0f).xxxx;
+}
+
+tint_symbol vertex_main() {
+  const float4 inner_result = vertex_main_inner();
+  tint_symbol wrapper_result = (tint_symbol)0;
+  wrapper_result.value = inner_result;
+  return wrapper_result;
+}
+
+void fragment_main() {
+  acos_5e9ad2();
+  return;
+}
+
+[numthreads(1, 1, 1)]
+void compute_main() {
+  acos_5e9ad2();
+  return;
+}

test/tint/builtins/gen/literal/acos/5e9ad2.wgsl.expected.glsl

@@ -0,0 +1,49 @@
+#version 310 es
+
+void acos_5e9ad2() {
+  float res = 0.5f;
+}
+
+vec4 vertex_main() {
+  acos_5e9ad2();
+  return vec4(0.0f);
+}
+
+void main() {
+  gl_PointSize = 1.0;
+  vec4 inner_result = vertex_main();
+  gl_Position = inner_result;
+  gl_Position.y = -(gl_Position.y);
+  gl_Position.z = ((2.0f * gl_Position.z) - gl_Position.w);
+  return;
+}
+#version 310 es
+precision mediump float;
+
+void acos_5e9ad2() {
+  float res = 0.5f;
+}
+
+void fragment_main() {
+  acos_5e9ad2();
+}
+
+void main() {
+  fragment_main();
+  return;
+}
+#version 310 es
+
+void acos_5e9ad2() {
+  float res = 0.5f;
+}
+
+void compute_main() {
+  acos_5e9ad2();
+}
+
+layout(local_size_x = 1, local_size_y = 1, local_size_z = 1) in;
+void main() {
+  compute_main();
+  return;
+}

test/tint/builtins/gen/literal/acos/5e9ad2.wgsl.expected.msl

@@ -0,0 +1,33 @@
+#include <metal_stdlib>
+
+using namespace metal;
+void acos_5e9ad2() {
+  float res = 0.5f;
+}
+
+struct tint_symbol {
+  float4 value [[position]];
+};
+
+float4 vertex_main_inner() {
+  acos_5e9ad2();
+  return float4(0.0f);
+}
+
+vertex tint_symbol vertex_main() {
+  float4 const inner_result = vertex_main_inner();
+  tint_symbol wrapper_result = {};
+  wrapper_result.value = inner_result;
+  return wrapper_result;
+}
+
+fragment void fragment_main() {
+  acos_5e9ad2();
+  return;
+}
+
+kernel void compute_main() {
+  acos_5e9ad2();
+  return;
+}
+

test/tint/builtins/gen/literal/acos/5e9ad2.wgsl.expected.spvasm

@@ -0,0 +1,64 @@
+; SPIR-V
+; Version: 1.3
+; Generator: Google Tint Compiler; 0
+; Bound: 30
+; Schema: 0
+               OpCapability Shader
+               OpMemoryModel Logical GLSL450
+               OpEntryPoint Vertex %vertex_main "vertex_main" %value %vertex_point_size
+               OpEntryPoint Fragment %fragment_main "fragment_main"
+               OpEntryPoint GLCompute %compute_main "compute_main"
+               OpExecutionMode %fragment_main OriginUpperLeft
+               OpExecutionMode %compute_main LocalSize 1 1 1
+               OpName %value "value"
+               OpName %vertex_point_size "vertex_point_size"
+               OpName %acos_5e9ad2 "acos_5e9ad2"
+               OpName %res "res"
+               OpName %vertex_main_inner "vertex_main_inner"
+               OpName %vertex_main "vertex_main"
+               OpName %fragment_main "fragment_main"
+               OpName %compute_main "compute_main"
+               OpDecorate %value BuiltIn Position
+               OpDecorate %vertex_point_size BuiltIn PointSize
+      %float = OpTypeFloat 32
+    %v4float = OpTypeVector %float 4
+%_ptr_Output_v4float = OpTypePointer Output %v4float
+          %5 = OpConstantNull %v4float
+      %value = OpVariable %_ptr_Output_v4float Output %5
+%_ptr_Output_float = OpTypePointer Output %float
+          %8 = OpConstantNull %float
+%vertex_point_size = OpVariable %_ptr_Output_float Output %8
+       %void = OpTypeVoid
+          %9 = OpTypeFunction %void
+  %float_0_5 = OpConstant %float 0.5
+%_ptr_Function_float = OpTypePointer Function %float
+         %16 = OpTypeFunction %v4float
+    %float_1 = OpConstant %float 1
+%acos_5e9ad2 = OpFunction %void None %9
+         %12 = OpLabel
+        %res = OpVariable %_ptr_Function_float Function %8
+               OpStore %res %float_0_5
+               OpReturn
+               OpFunctionEnd
+%vertex_main_inner = OpFunction %v4float None %16
+         %18 = OpLabel
+         %19 = OpFunctionCall %void %acos_5e9ad2
+               OpReturnValue %5
+               OpFunctionEnd
+%vertex_main = OpFunction %void None %9
+         %21 = OpLabel
+         %22 = OpFunctionCall %v4float %vertex_main_inner
+               OpStore %value %22
+               OpStore %vertex_point_size %float_1
+               OpReturn
+               OpFunctionEnd
+%fragment_main = OpFunction %void None %9
+         %25 = OpLabel
+         %26 = OpFunctionCall %void %acos_5e9ad2
+               OpReturn
+               OpFunctionEnd
+%compute_main = OpFunction %void None %9
+         %28 = OpLabel
+         %29 = OpFunctionCall %void %acos_5e9ad2
+               OpReturn
+               OpFunctionEnd

test/tint/builtins/gen/literal/acos/5e9ad2.wgsl.expected.wgsl

@@ -0,0 +1,19 @@
+fn acos_5e9ad2() {
+  var res = acos(0.87758256188999995);
+}
+
+@vertex
+fn vertex_main() -> @builtin(position) vec4<f32> {
+  acos_5e9ad2();
+  return vec4<f32>();
+}
+
+@fragment
+fn fragment_main() {
+  acos_5e9ad2();
+}
+
+@compute @workgroup_size(1)
+fn compute_main() {
+  acos_5e9ad2();
+}

test/tint/builtins/gen/literal/acos/8e2acf.wgsl

@@ -23,7 +23,7 @@
 
 // fn acos(vec<4, f32>) -> vec<4, f32>
 fn acos_8e2acf() {
-  var res: vec4<f32> = acos(vec4<f32>(1.f));
+  var res: vec4<f32> = acos(vec4<f32>(0.87758256189f));
 }
 
 @vertex

test/tint/builtins/gen/literal/acos/8e2acf.wgsl.expected.dxc.hlsl

@@ -1,5 +1,5 @@
 void acos_8e2acf() {
-  float4 res = acos((1.0f).xxxx);
+  float4 res = (0.5f).xxxx;
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/acos/8e2acf.wgsl.expected.fxc.hlsl

@@ -1,5 +1,5 @@
 void acos_8e2acf() {
-  float4 res = acos((1.0f).xxxx);
+  float4 res = (0.5f).xxxx;
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/acos/8e2acf.wgsl.expected.glsl

@@ -1,7 +1,7 @@
 #version 310 es
 
 void acos_8e2acf() {
-  vec4 res = acos(vec4(1.0f));
+  vec4 res = vec4(0.5f);
 }
 
 vec4 vertex_main() {
@@ -21,7 +21,7 @@ void main() {
 precision mediump float;
 
 void acos_8e2acf() {
-  vec4 res = acos(vec4(1.0f));
+  vec4 res = vec4(0.5f);
 }
 
 void fragment_main() {
@@ -35,7 +35,7 @@ void main() {
 #version 310 es
 
 void acos_8e2acf() {
-  vec4 res = acos(vec4(1.0f));
+  vec4 res = vec4(0.5f);
 }
 
 void compute_main() {

test/tint/builtins/gen/literal/acos/8e2acf.wgsl.expected.msl

@@ -2,7 +2,7 @@
 
 using namespace metal;
 void acos_8e2acf() {
-  float4 res = acos(float4(1.0f));
+  float4 res = float4(0.5f);
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/acos/8e2acf.wgsl.expected.spvasm

@@ -1,10 +1,9 @@
 ; SPIR-V
 ; Version: 1.3
 ; Generator: Google Tint Compiler; 0
-; Bound: 32
+; Bound: 31
 ; Schema: 0
                OpCapability Shader
-         %14 = OpExtInstImport "GLSL.std.450"
                OpMemoryModel Logical GLSL450
                OpEntryPoint Vertex %vertex_main "vertex_main" %value %vertex_point_size
                OpEntryPoint Fragment %fragment_main "fragment_main"
@@ -31,36 +30,36 @@
 %vertex_point_size = OpVariable %_ptr_Output_float Output %8
        %void = OpTypeVoid
           %9 = OpTypeFunction %void
-    %float_1 = OpConstant %float 1
+  %float_0_5 = OpConstant %float 0.5
-         %16 = OpConstantComposite %v4float %float_1 %float_1 %float_1 %float_1
+         %14 = OpConstantComposite %v4float %float_0_5 %float_0_5 %float_0_5 %float_0_5
 %_ptr_Function_v4float = OpTypePointer Function %v4float
-         %19 = OpTypeFunction %v4float
+         %17 = OpTypeFunction %v4float
+    %float_1 = OpConstant %float 1
 %acos_8e2acf = OpFunction %void None %9
          %12 = OpLabel
         %res = OpVariable %_ptr_Function_v4float Function %5
-         %13 = OpExtInst %v4float %14 Acos %16
+               OpStore %res %14
-               OpStore %res %13
                OpReturn
                OpFunctionEnd
-%vertex_main_inner = OpFunction %v4float None %19
+%vertex_main_inner = OpFunction %v4float None %17
-         %21 = OpLabel
+         %19 = OpLabel
-         %22 = OpFunctionCall %void %acos_8e2acf
+         %20 = OpFunctionCall %void %acos_8e2acf
                OpReturnValue %5
                OpFunctionEnd
 %vertex_main = OpFunction %void None %9
-         %24 = OpLabel
+         %22 = OpLabel
-         %25 = OpFunctionCall %v4float %vertex_main_inner
+         %23 = OpFunctionCall %v4float %vertex_main_inner
-               OpStore %value %25
+               OpStore %value %23
                OpStore %vertex_point_size %float_1
                OpReturn
                OpFunctionEnd
 %fragment_main = OpFunction %void None %9
-         %27 = OpLabel
+         %26 = OpLabel
-         %28 = OpFunctionCall %void %acos_8e2acf
+         %27 = OpFunctionCall %void %acos_8e2acf
                OpReturn
                OpFunctionEnd
 %compute_main = OpFunction %void None %9
-         %30 = OpLabel
+         %29 = OpLabel
-         %31 = OpFunctionCall %void %acos_8e2acf
+         %30 = OpFunctionCall %void %acos_8e2acf
                OpReturn
                OpFunctionEnd

test/tint/builtins/gen/literal/acos/8e2acf.wgsl.expected.wgsl

@@ -1,5 +1,5 @@
 fn acos_8e2acf() {
-  var res : vec4<f32> = acos(vec4<f32>(1.0f));
+  var res : vec4<f32> = acos(vec4<f32>(0.87758255f));
 }
 
 @vertex

test/tint/builtins/gen/literal/acos/a610c4.wgsl

@@ -23,7 +23,7 @@
 
 // fn acos(vec<3, f32>) -> vec<3, f32>
 fn acos_a610c4() {
-  var res: vec3<f32> = acos(vec3<f32>(1.f));
+  var res: vec3<f32> = acos(vec3<f32>(0.87758256189f));
 }
 
 @vertex

test/tint/builtins/gen/literal/acos/a610c4.wgsl.expected.dxc.hlsl

@@ -1,5 +1,5 @@
 void acos_a610c4() {
-  float3 res = acos((1.0f).xxx);
+  float3 res = (0.5f).xxx;
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/acos/a610c4.wgsl.expected.fxc.hlsl

@@ -1,5 +1,5 @@
 void acos_a610c4() {
-  float3 res = acos((1.0f).xxx);
+  float3 res = (0.5f).xxx;
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/acos/a610c4.wgsl.expected.glsl

@@ -1,7 +1,7 @@
 #version 310 es
 
 void acos_a610c4() {
-  vec3 res = acos(vec3(1.0f));
+  vec3 res = vec3(0.5f);
 }
 
 vec4 vertex_main() {
@@ -21,7 +21,7 @@ void main() {
 precision mediump float;
 
 void acos_a610c4() {
-  vec3 res = acos(vec3(1.0f));
+  vec3 res = vec3(0.5f);
 }
 
 void fragment_main() {
@@ -35,7 +35,7 @@ void main() {
 #version 310 es
 
 void acos_a610c4() {
-  vec3 res = acos(vec3(1.0f));
+  vec3 res = vec3(0.5f);
 }
 
 void compute_main() {

test/tint/builtins/gen/literal/acos/a610c4.wgsl.expected.msl

@@ -2,7 +2,7 @@
 
 using namespace metal;
 void acos_a610c4() {
-  float3 res = acos(float3(1.0f));
+  float3 res = float3(0.5f);
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/acos/a610c4.wgsl.expected.spvasm

@@ -1,10 +1,9 @@
 ; SPIR-V
 ; Version: 1.3
 ; Generator: Google Tint Compiler; 0
-; Bound: 34
+; Bound: 33
 ; Schema: 0
                OpCapability Shader
-         %15 = OpExtInstImport "GLSL.std.450"
                OpMemoryModel Logical GLSL450
                OpEntryPoint Vertex %vertex_main "vertex_main" %value %vertex_point_size
                OpEntryPoint Fragment %fragment_main "fragment_main"
@@ -32,37 +31,37 @@
        %void = OpTypeVoid
           %9 = OpTypeFunction %void
     %v3float = OpTypeVector %float 3
-    %float_1 = OpConstant %float 1
+  %float_0_5 = OpConstant %float 0.5
-         %17 = OpConstantComposite %v3float %float_1 %float_1 %float_1
+         %15 = OpConstantComposite %v3float %float_0_5 %float_0_5 %float_0_5
 %_ptr_Function_v3float = OpTypePointer Function %v3float
-         %20 = OpConstantNull %v3float
+         %18 = OpConstantNull %v3float
-         %21 = OpTypeFunction %v4float
+         %19 = OpTypeFunction %v4float
+    %float_1 = OpConstant %float 1
 %acos_a610c4 = OpFunction %void None %9
          %12 = OpLabel
-        %res = OpVariable %_ptr_Function_v3float Function %20
+        %res = OpVariable %_ptr_Function_v3float Function %18
-         %13 = OpExtInst %v3float %15 Acos %17
+               OpStore %res %15
-               OpStore %res %13
                OpReturn
                OpFunctionEnd
-%vertex_main_inner = OpFunction %v4float None %21
+%vertex_main_inner = OpFunction %v4float None %19
-         %23 = OpLabel
+         %21 = OpLabel
-         %24 = OpFunctionCall %void %acos_a610c4
+         %22 = OpFunctionCall %void %acos_a610c4
                OpReturnValue %5
                OpFunctionEnd
 %vertex_main = OpFunction %void None %9
-         %26 = OpLabel
+         %24 = OpLabel
-         %27 = OpFunctionCall %v4float %vertex_main_inner
+         %25 = OpFunctionCall %v4float %vertex_main_inner
-               OpStore %value %27
+               OpStore %value %25
                OpStore %vertex_point_size %float_1
                OpReturn
                OpFunctionEnd
 %fragment_main = OpFunction %void None %9
-         %29 = OpLabel
+         %28 = OpLabel
-         %30 = OpFunctionCall %void %acos_a610c4
+         %29 = OpFunctionCall %void %acos_a610c4
                OpReturn
                OpFunctionEnd
 %compute_main = OpFunction %void None %9
-         %32 = OpLabel
+         %31 = OpLabel
-         %33 = OpFunctionCall %void %acos_a610c4
+         %32 = OpFunctionCall %void %acos_a610c4
                OpReturn
                OpFunctionEnd

test/tint/builtins/gen/literal/acos/a610c4.wgsl.expected.wgsl

@@ -1,5 +1,5 @@
 fn acos_a610c4() {
-  var res : vec3<f32> = acos(vec3<f32>(1.0f));
+  var res : vec3<f32> = acos(vec3<f32>(0.87758255f));
 }
 
 @vertex

test/tint/builtins/gen/literal/acos/dfc915.wgsl

@@ -23,7 +23,7 @@
 
 // fn acos(vec<2, f32>) -> vec<2, f32>
 fn acos_dfc915() {
-  var res: vec2<f32> = acos(vec2<f32>(1.f));
+  var res: vec2<f32> = acos(vec2<f32>(0.87758256189f));
 }
 
 @vertex

test/tint/builtins/gen/literal/acos/dfc915.wgsl.expected.dxc.hlsl

@@ -1,5 +1,5 @@
 void acos_dfc915() {
-  float2 res = acos((1.0f).xx);
+  float2 res = (0.5f).xx;
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/acos/dfc915.wgsl.expected.fxc.hlsl

@@ -1,5 +1,5 @@
 void acos_dfc915() {
-  float2 res = acos((1.0f).xx);
+  float2 res = (0.5f).xx;
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/acos/dfc915.wgsl.expected.glsl

@@ -1,7 +1,7 @@
 #version 310 es
 
 void acos_dfc915() {
-  vec2 res = acos(vec2(1.0f));
+  vec2 res = vec2(0.5f);
 }
 
 vec4 vertex_main() {
@@ -21,7 +21,7 @@ void main() {
 precision mediump float;
 
 void acos_dfc915() {
-  vec2 res = acos(vec2(1.0f));
+  vec2 res = vec2(0.5f);
 }
 
 void fragment_main() {
@@ -35,7 +35,7 @@ void main() {
 #version 310 es
 
 void acos_dfc915() {
-  vec2 res = acos(vec2(1.0f));
+  vec2 res = vec2(0.5f);
 }
 
 void compute_main() {

test/tint/builtins/gen/literal/acos/dfc915.wgsl.expected.msl

@@ -2,7 +2,7 @@
 
 using namespace metal;
 void acos_dfc915() {
-  float2 res = acos(float2(1.0f));
+  float2 res = float2(0.5f);
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/acos/dfc915.wgsl.expected.spvasm

@@ -1,10 +1,9 @@
 ; SPIR-V
 ; Version: 1.3
 ; Generator: Google Tint Compiler; 0
-; Bound: 34
+; Bound: 33
 ; Schema: 0
                OpCapability Shader
-         %15 = OpExtInstImport "GLSL.std.450"
                OpMemoryModel Logical GLSL450
                OpEntryPoint Vertex %vertex_main "vertex_main" %value %vertex_point_size
                OpEntryPoint Fragment %fragment_main "fragment_main"
@@ -32,37 +31,37 @@
        %void = OpTypeVoid
           %9 = OpTypeFunction %void
     %v2float = OpTypeVector %float 2
-    %float_1 = OpConstant %float 1
+  %float_0_5 = OpConstant %float 0.5
-         %17 = OpConstantComposite %v2float %float_1 %float_1
+         %15 = OpConstantComposite %v2float %float_0_5 %float_0_5
 %_ptr_Function_v2float = OpTypePointer Function %v2float
-         %20 = OpConstantNull %v2float
+         %18 = OpConstantNull %v2float
-         %21 = OpTypeFunction %v4float
+         %19 = OpTypeFunction %v4float
+    %float_1 = OpConstant %float 1
 %acos_dfc915 = OpFunction %void None %9
          %12 = OpLabel
-        %res = OpVariable %_ptr_Function_v2float Function %20
+        %res = OpVariable %_ptr_Function_v2float Function %18
-         %13 = OpExtInst %v2float %15 Acos %17
+               OpStore %res %15
-               OpStore %res %13
                OpReturn
                OpFunctionEnd
-%vertex_main_inner = OpFunction %v4float None %21
+%vertex_main_inner = OpFunction %v4float None %19
-         %23 = OpLabel
+         %21 = OpLabel
-         %24 = OpFunctionCall %void %acos_dfc915
+         %22 = OpFunctionCall %void %acos_dfc915
                OpReturnValue %5
                OpFunctionEnd
 %vertex_main = OpFunction %void None %9
-         %26 = OpLabel
+         %24 = OpLabel
-         %27 = OpFunctionCall %v4float %vertex_main_inner
+         %25 = OpFunctionCall %v4float %vertex_main_inner
-               OpStore %value %27
+               OpStore %value %25
                OpStore %vertex_point_size %float_1
                OpReturn
                OpFunctionEnd
 %fragment_main = OpFunction %void None %9
-         %29 = OpLabel
+         %28 = OpLabel
-         %30 = OpFunctionCall %void %acos_dfc915
+         %29 = OpFunctionCall %void %acos_dfc915
                OpReturn
                OpFunctionEnd
 %compute_main = OpFunction %void None %9
-         %32 = OpLabel
+         %31 = OpLabel
-         %33 = OpFunctionCall %void %acos_dfc915
+         %32 = OpFunctionCall %void %acos_dfc915
                OpReturn
                OpFunctionEnd

test/tint/builtins/gen/literal/acos/dfc915.wgsl.expected.wgsl

@@ -1,5 +1,5 @@
 fn acos_dfc915() {
-  var res : vec2<f32> = acos(vec2<f32>(1.0f));
+  var res : vec2<f32> = acos(vec2<f32>(0.87758255f));
 }
 
 @vertex

test/tint/builtins/gen/literal/acos/f47057.wgsl.expected.dxc.hlsl

@@ -1,5 +1,5 @@
 void acos_f47057() {
-  vector<float16_t, 3> res = acos((float16_t(0.0h)).xxx);
+  vector<float16_t, 3> res = (float16_t(1.5703125h)).xxx;
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/acos/f47057.wgsl.expected.glsl

@@ -2,7 +2,7 @@
 #extension GL_AMD_gpu_shader_half_float : require
 
 void acos_f47057() {
-  f16vec3 res = acos(f16vec3(0.0hf));
+  f16vec3 res = f16vec3(1.5703125hf);
 }
 
 vec4 vertex_main() {
@@ -23,7 +23,7 @@ void main() {
 precision mediump float;
 
 void acos_f47057() {
-  f16vec3 res = acos(f16vec3(0.0hf));
+  f16vec3 res = f16vec3(1.5703125hf);
 }
 
 void fragment_main() {
@@ -38,7 +38,7 @@ void main() {
 #extension GL_AMD_gpu_shader_half_float : require
 
 void acos_f47057() {
-  f16vec3 res = acos(f16vec3(0.0hf));
+  f16vec3 res = f16vec3(1.5703125hf);
 }
 
 void compute_main() {

test/tint/builtins/gen/literal/acos/f47057.wgsl.expected.msl

@@ -2,7 +2,7 @@
 
 using namespace metal;
 void acos_f47057() {
-  half3 res = acos(half3(0.0h));
+  half3 res = half3(1.5703125h);
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/acos/f47057.wgsl.expected.spvasm

@@ -8,7 +8,6 @@
                OpCapability UniformAndStorageBuffer16BitAccess
                OpCapability StorageBuffer16BitAccess
                OpCapability StorageInputOutput16
-         %16 = OpExtInstImport "GLSL.std.450"
                OpMemoryModel Logical GLSL450
                OpEntryPoint Vertex %vertex_main "vertex_main" %value %vertex_point_size
                OpEntryPoint Fragment %fragment_main "fragment_main"
@@ -37,15 +36,16 @@
           %9 = OpTypeFunction %void
        %half = OpTypeFloat 16
      %v3half = OpTypeVector %half 3
-         %17 = OpConstantNull %v3half
+%half_0x1_92p_0 = OpConstant %half 0x1.92p+0
+         %16 = OpConstantComposite %v3half %half_0x1_92p_0 %half_0x1_92p_0 %half_0x1_92p_0
 %_ptr_Function_v3half = OpTypePointer Function %v3half
+         %19 = OpConstantNull %v3half
          %20 = OpTypeFunction %v4float
     %float_1 = OpConstant %float 1
 %acos_f47057 = OpFunction %void None %9
          %12 = OpLabel
-        %res = OpVariable %_ptr_Function_v3half Function %17
+        %res = OpVariable %_ptr_Function_v3half Function %19
-         %13 = OpExtInst %v3half %16 Acos %17
+               OpStore %res %16
-               OpStore %res %13
                OpReturn
                OpFunctionEnd
 %vertex_main_inner = OpFunction %v4float None %20

test/tint/builtins/gen/var/acos/069188.wgsl

@@ -0,0 +1,44 @@
+// Copyright 2022 The Tint Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+////////////////////////////////////////////////////////////////////////////////
+// File generated by tools/src/cmd/gen
+// using the template:
+//   test/tint/builtins/gen/gen.wgsl.tmpl
+//
+// Do not modify this file directly
+////////////////////////////////////////////////////////////////////////////////
+
+
+// fn acos(vec<3, fa>) -> vec<3, fa>
+fn acos_069188() {
+  const arg_0 = vec3(0.87758256189);
+  var res = acos(arg_0);
+}
+
+@vertex
+fn vertex_main() -> @builtin(position) vec4<f32> {
+  acos_069188();
+  return vec4<f32>();
+}
+
+@fragment
+fn fragment_main() {
+  acos_069188();
+}
+
+@compute @workgroup_size(1)
+fn compute_main() {
+  acos_069188();
+}

test/tint/builtins/gen/var/acos/069188.wgsl.expected.dxc.hlsl

@@ -0,0 +1,30 @@
+void acos_069188() {
+  float3 res = (0.5f).xxx;
+}
+
+struct tint_symbol {
+  float4 value : SV_Position;
+};
+
+float4 vertex_main_inner() {
+  acos_069188();
+  return (0.0f).xxxx;
+}
+
+tint_symbol vertex_main() {
+  const float4 inner_result = vertex_main_inner();
+  tint_symbol wrapper_result = (tint_symbol)0;
+  wrapper_result.value = inner_result;
+  return wrapper_result;
+}
+
+void fragment_main() {
+  acos_069188();
+  return;
+}
+
+[numthreads(1, 1, 1)]
+void compute_main() {
+  acos_069188();
+  return;
+}

test/tint/builtins/gen/var/acos/069188.wgsl.expected.fxc.hlsl

@@ -0,0 +1,30 @@
+void acos_069188() {
+  float3 res = (0.5f).xxx;
+}
+
+struct tint_symbol {
+  float4 value : SV_Position;
+};
+
+float4 vertex_main_inner() {
+  acos_069188();
+  return (0.0f).xxxx;
+}
+
+tint_symbol vertex_main() {
+  const float4 inner_result = vertex_main_inner();
+  tint_symbol wrapper_result = (tint_symbol)0;
+  wrapper_result.value = inner_result;
+  return wrapper_result;
+}
+
+void fragment_main() {
+  acos_069188();
+  return;
+}
+
+[numthreads(1, 1, 1)]
+void compute_main() {
+  acos_069188();
+  return;
+}

test/tint/builtins/gen/var/acos/069188.wgsl.expected.glsl

@@ -0,0 +1,49 @@
+#version 310 es
+
+void acos_069188() {
+  vec3 res = vec3(0.5f);
+}
+
+vec4 vertex_main() {
+  acos_069188();
+  return vec4(0.0f);
+}
+
+void main() {
+  gl_PointSize = 1.0;
+  vec4 inner_result = vertex_main();
+  gl_Position = inner_result;
+  gl_Position.y = -(gl_Position.y);
+  gl_Position.z = ((2.0f * gl_Position.z) - gl_Position.w);
+  return;
+}
+#version 310 es
+precision mediump float;
+
+void acos_069188() {
+  vec3 res = vec3(0.5f);
+}
+
+void fragment_main() {
+  acos_069188();
+}
+
+void main() {
+  fragment_main();
+  return;
+}
+#version 310 es
+
+void acos_069188() {
+  vec3 res = vec3(0.5f);
+}
+
+void compute_main() {
+  acos_069188();
+}
+
+layout(local_size_x = 1, local_size_y = 1, local_size_z = 1) in;
+void main() {
+  compute_main();
+  return;
+}

test/tint/builtins/gen/var/acos/069188.wgsl.expected.msl

@@ -0,0 +1,33 @@
+#include <metal_stdlib>
+
+using namespace metal;
+void acos_069188() {
+  float3 res = float3(0.5f);
+}
+
+struct tint_symbol {
+  float4 value [[position]];
+};
+
+float4 vertex_main_inner() {
+  acos_069188();
+  return float4(0.0f);
+}
+
+vertex tint_symbol vertex_main() {
+  float4 const inner_result = vertex_main_inner();
+  tint_symbol wrapper_result = {};
+  wrapper_result.value = inner_result;
+  return wrapper_result;
+}
+
+fragment void fragment_main() {
+  acos_069188();
+  return;
+}
+
+kernel void compute_main() {
+  acos_069188();
+  return;
+}
+

test/tint/builtins/gen/var/acos/069188.wgsl.expected.spvasm

@@ -0,0 +1,67 @@
+; SPIR-V
+; Version: 1.3
+; Generator: Google Tint Compiler; 0
+; Bound: 33
+; Schema: 0
+               OpCapability Shader
+               OpMemoryModel Logical GLSL450
+               OpEntryPoint Vertex %vertex_main "vertex_main" %value %vertex_point_size
+               OpEntryPoint Fragment %fragment_main "fragment_main"
+               OpEntryPoint GLCompute %compute_main "compute_main"
+               OpExecutionMode %fragment_main OriginUpperLeft
+               OpExecutionMode %compute_main LocalSize 1 1 1
+               OpName %value "value"
+               OpName %vertex_point_size "vertex_point_size"
+               OpName %acos_069188 "acos_069188"
+               OpName %res "res"
+               OpName %vertex_main_inner "vertex_main_inner"
+               OpName %vertex_main "vertex_main"
+               OpName %fragment_main "fragment_main"
+               OpName %compute_main "compute_main"
+               OpDecorate %value BuiltIn Position
+               OpDecorate %vertex_point_size BuiltIn PointSize
+      %float = OpTypeFloat 32
+    %v4float = OpTypeVector %float 4
+%_ptr_Output_v4float = OpTypePointer Output %v4float
+          %5 = OpConstantNull %v4float
+      %value = OpVariable %_ptr_Output_v4float Output %5
+%_ptr_Output_float = OpTypePointer Output %float
+          %8 = OpConstantNull %float
+%vertex_point_size = OpVariable %_ptr_Output_float Output %8
+       %void = OpTypeVoid
+          %9 = OpTypeFunction %void
+    %v3float = OpTypeVector %float 3
+  %float_0_5 = OpConstant %float 0.5
+         %15 = OpConstantComposite %v3float %float_0_5 %float_0_5 %float_0_5
+%_ptr_Function_v3float = OpTypePointer Function %v3float
+         %18 = OpConstantNull %v3float
+         %19 = OpTypeFunction %v4float
+    %float_1 = OpConstant %float 1
+%acos_069188 = OpFunction %void None %9
+         %12 = OpLabel
+        %res = OpVariable %_ptr_Function_v3float Function %18
+               OpStore %res %15
+               OpReturn
+               OpFunctionEnd
+%vertex_main_inner = OpFunction %v4float None %19
+         %21 = OpLabel
+         %22 = OpFunctionCall %void %acos_069188
+               OpReturnValue %5
+               OpFunctionEnd
+%vertex_main = OpFunction %void None %9
+         %24 = OpLabel
+         %25 = OpFunctionCall %v4float %vertex_main_inner
+               OpStore %value %25
+               OpStore %vertex_point_size %float_1
+               OpReturn
+               OpFunctionEnd
+%fragment_main = OpFunction %void None %9
+         %28 = OpLabel
+         %29 = OpFunctionCall %void %acos_069188
+               OpReturn
+               OpFunctionEnd
+%compute_main = OpFunction %void None %9
+         %31 = OpLabel
+         %32 = OpFunctionCall %void %acos_069188
+               OpReturn
+               OpFunctionEnd

test/tint/builtins/gen/var/acos/069188.wgsl.expected.wgsl

@@ -0,0 +1,20 @@
+fn acos_069188() {
+  const arg_0 = vec3(0.87758256188999995);
+  var res = acos(arg_0);
+}
+
+@vertex
+fn vertex_main() -> @builtin(position) vec4<f32> {
+  acos_069188();
+  return vec4<f32>();
+}
+
+@fragment
+fn fragment_main() {
+  acos_069188();
+}
+
+@compute @workgroup_size(1)
+fn compute_main() {
+  acos_069188();
+}

test/tint/builtins/gen/var/acos/15d35b.wgsl

@@ -0,0 +1,44 @@
+// Copyright 2022 The Tint Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+////////////////////////////////////////////////////////////////////////////////
+// File generated by tools/src/cmd/gen
+// using the template:
+//   test/tint/builtins/gen/gen.wgsl.tmpl
+//
+// Do not modify this file directly
+////////////////////////////////////////////////////////////////////////////////
+
+
+// fn acos(vec<2, fa>) -> vec<2, fa>
+fn acos_15d35b() {
+  const arg_0 = vec2(0.87758256189);
+  var res = acos(arg_0);
+}
+
+@vertex
+fn vertex_main() -> @builtin(position) vec4<f32> {
+  acos_15d35b();
+  return vec4<f32>();
+}
+
+@fragment
+fn fragment_main() {
+  acos_15d35b();
+}
+
+@compute @workgroup_size(1)
+fn compute_main() {
+  acos_15d35b();
+}

test/tint/builtins/gen/var/acos/15d35b.wgsl.expected.dxc.hlsl

@@ -0,0 +1,30 @@
+void acos_15d35b() {
+  float2 res = (0.5f).xx;
+}
+
+struct tint_symbol {
+  float4 value : SV_Position;
+};
+
+float4 vertex_main_inner() {
+  acos_15d35b();
+  return (0.0f).xxxx;
+}
+
+tint_symbol vertex_main() {
+  const float4 inner_result = vertex_main_inner();
+  tint_symbol wrapper_result = (tint_symbol)0;
+  wrapper_result.value = inner_result;
+  return wrapper_result;
+}
+
+void fragment_main() {
+  acos_15d35b();
+  return;
+}
+
+[numthreads(1, 1, 1)]
+void compute_main() {
+  acos_15d35b();
+  return;
+}

test/tint/builtins/gen/var/acos/15d35b.wgsl.expected.fxc.hlsl

@@ -0,0 +1,30 @@
+void acos_15d35b() {
+  float2 res = (0.5f).xx;
+}
+
+struct tint_symbol {
+  float4 value : SV_Position;
+};
+
+float4 vertex_main_inner() {
+  acos_15d35b();
+  return (0.0f).xxxx;
+}
+
+tint_symbol vertex_main() {
+  const float4 inner_result = vertex_main_inner();
+  tint_symbol wrapper_result = (tint_symbol)0;
+  wrapper_result.value = inner_result;
+  return wrapper_result;
+}
+
+void fragment_main() {
+  acos_15d35b();
+  return;
+}
+
+[numthreads(1, 1, 1)]
+void compute_main() {
+  acos_15d35b();
+  return;
+}

test/tint/builtins/gen/var/acos/15d35b.wgsl.expected.glsl

@@ -0,0 +1,49 @@
+#version 310 es
+
+void acos_15d35b() {
+  vec2 res = vec2(0.5f);
+}
+
+vec4 vertex_main() {
+  acos_15d35b();
+  return vec4(0.0f);
+}
+
+void main() {
+  gl_PointSize = 1.0;
+  vec4 inner_result = vertex_main();
+  gl_Position = inner_result;
+  gl_Position.y = -(gl_Position.y);
+  gl_Position.z = ((2.0f * gl_Position.z) - gl_Position.w);
+  return;
+}
+#version 310 es
+precision mediump float;
+
+void acos_15d35b() {
+  vec2 res = vec2(0.5f);
+}
+
+void fragment_main() {
+  acos_15d35b();
+}
+
+void main() {
+  fragment_main();
+  return;
+}
+#version 310 es
+
+void acos_15d35b() {
+  vec2 res = vec2(0.5f);
+}
+
+void compute_main() {
+  acos_15d35b();
+}
+
+layout(local_size_x = 1, local_size_y = 1, local_size_z = 1) in;
+void main() {
+  compute_main();
+  return;
+}

test/tint/builtins/gen/var/acos/15d35b.wgsl.expected.msl

@@ -0,0 +1,33 @@
+#include <metal_stdlib>
+
+using namespace metal;
+void acos_15d35b() {
+  float2 res = float2(0.5f);
+}
+
+struct tint_symbol {
+  float4 value [[position]];
+};
+
+float4 vertex_main_inner() {
+  acos_15d35b();
+  return float4(0.0f);
+}
+
+vertex tint_symbol vertex_main() {
+  float4 const inner_result = vertex_main_inner();
+  tint_symbol wrapper_result = {};
+  wrapper_result.value = inner_result;
+  return wrapper_result;
+}
+
+fragment void fragment_main() {
+  acos_15d35b();
+  return;
+}
+
+kernel void compute_main() {
+  acos_15d35b();
+  return;
+}
+

test/tint/builtins/gen/var/acos/15d35b.wgsl.expected.spvasm

@@ -0,0 +1,67 @@
+; SPIR-V
+; Version: 1.3
+; Generator: Google Tint Compiler; 0
+; Bound: 33
+; Schema: 0
+               OpCapability Shader
+               OpMemoryModel Logical GLSL450
+               OpEntryPoint Vertex %vertex_main "vertex_main" %value %vertex_point_size
+               OpEntryPoint Fragment %fragment_main "fragment_main"
+               OpEntryPoint GLCompute %compute_main "compute_main"
+               OpExecutionMode %fragment_main OriginUpperLeft
+               OpExecutionMode %compute_main LocalSize 1 1 1
+               OpName %value "value"
+               OpName %vertex_point_size "vertex_point_size"
+               OpName %acos_15d35b "acos_15d35b"
+               OpName %res "res"
+               OpName %vertex_main_inner "vertex_main_inner"
+               OpName %vertex_main "vertex_main"
+               OpName %fragment_main "fragment_main"
+               OpName %compute_main "compute_main"
+               OpDecorate %value BuiltIn Position
+               OpDecorate %vertex_point_size BuiltIn PointSize
+      %float = OpTypeFloat 32
+    %v4float = OpTypeVector %float 4
+%_ptr_Output_v4float = OpTypePointer Output %v4float
+          %5 = OpConstantNull %v4float
+      %value = OpVariable %_ptr_Output_v4float Output %5
+%_ptr_Output_float = OpTypePointer Output %float
+          %8 = OpConstantNull %float
+%vertex_point_size = OpVariable %_ptr_Output_float Output %8
+       %void = OpTypeVoid
+          %9 = OpTypeFunction %void
+    %v2float = OpTypeVector %float 2
+  %float_0_5 = OpConstant %float 0.5
+         %15 = OpConstantComposite %v2float %float_0_5 %float_0_5
+%_ptr_Function_v2float = OpTypePointer Function %v2float
+         %18 = OpConstantNull %v2float
+         %19 = OpTypeFunction %v4float
+    %float_1 = OpConstant %float 1
+%acos_15d35b = OpFunction %void None %9
+         %12 = OpLabel
+        %res = OpVariable %_ptr_Function_v2float Function %18
+               OpStore %res %15
+               OpReturn
+               OpFunctionEnd
+%vertex_main_inner = OpFunction %v4float None %19
+         %21 = OpLabel
+         %22 = OpFunctionCall %void %acos_15d35b
+               OpReturnValue %5
+               OpFunctionEnd
+%vertex_main = OpFunction %void None %9
+         %24 = OpLabel
+         %25 = OpFunctionCall %v4float %vertex_main_inner
+               OpStore %value %25
+               OpStore %vertex_point_size %float_1
+               OpReturn
+               OpFunctionEnd
+%fragment_main = OpFunction %void None %9
+         %28 = OpLabel
+         %29 = OpFunctionCall %void %acos_15d35b
+               OpReturn
+               OpFunctionEnd
+%compute_main = OpFunction %void None %9
+         %31 = OpLabel
+         %32 = OpFunctionCall %void %acos_15d35b
+               OpReturn
+               OpFunctionEnd

test/tint/builtins/gen/var/acos/15d35b.wgsl.expected.wgsl

@@ -0,0 +1,20 @@
+fn acos_15d35b() {
+  const arg_0 = vec2(0.87758256188999995);
+  var res = acos(arg_0);
+}
+
+@vertex
+fn vertex_main() -> @builtin(position) vec4<f32> {
+  acos_15d35b();
+  return vec4<f32>();
+}
+
+@fragment
+fn fragment_main() {
+  acos_15d35b();
+}
+
+@compute @workgroup_size(1)
+fn compute_main() {
+  acos_15d35b();
+}

test/tint/builtins/gen/var/acos/489247.wgsl

@@ -23,7 +23,7 @@
 
 // fn acos(f32) -> f32
 fn acos_489247() {
-  var arg_0 = 1.f;
+  var arg_0 = 0.87758256189f;
   var res: f32 = acos(arg_0);
 }
 

test/tint/builtins/gen/var/acos/489247.wgsl.expected.dxc.hlsl

@@ -1,5 +1,5 @@
 void acos_489247() {
-  float arg_0 = 1.0f;
+  float arg_0 = 0.87758255f;
   float res = acos(arg_0);
 }
 

test/tint/builtins/gen/var/acos/489247.wgsl.expected.fxc.hlsl

@@ -1,5 +1,5 @@
 void acos_489247() {
-  float arg_0 = 1.0f;
+  float arg_0 = 0.87758255f;
   float res = acos(arg_0);
 }
 

test/tint/builtins/gen/var/acos/489247.wgsl.expected.glsl

@@ -1,7 +1,7 @@
 #version 310 es
 
 void acos_489247() {
-  float arg_0 = 1.0f;
+  float arg_0 = 0.87758255f;
   float res = acos(arg_0);
 }
 
@@ -22,7 +22,7 @@ void main() {
 precision mediump float;
 
 void acos_489247() {
-  float arg_0 = 1.0f;
+  float arg_0 = 0.87758255f;
   float res = acos(arg_0);
 }
 
@@ -37,7 +37,7 @@ void main() {
 #version 310 es
 
 void acos_489247() {
-  float arg_0 = 1.0f;
+  float arg_0 = 0.87758255f;
   float res = acos(arg_0);
 }
 

test/tint/builtins/gen/var/acos/489247.wgsl.expected.msl

@@ -2,7 +2,7 @@
 
 using namespace metal;
 void acos_489247() {
-  float arg_0 = 1.0f;
+  float arg_0 = 0.87758255f;
   float res = acos(arg_0);
 }
 

test/tint/builtins/gen/var/acos/489247.wgsl.expected.spvasm

@@ -1,7 +1,7 @@
 ; SPIR-V
 ; Version: 1.3
 ; Generator: Google Tint Compiler; 0
-; Bound: 33
+; Bound: 34
 ; Schema: 0
                OpCapability Shader
          %17 = OpExtInstImport "GLSL.std.450"
@@ -32,14 +32,15 @@
 %vertex_point_size = OpVariable %_ptr_Output_float Output %8
        %void = OpTypeVoid
           %9 = OpTypeFunction %void
-    %float_1 = OpConstant %float 1
+%float_0_87758255 = OpConstant %float 0.87758255
 %_ptr_Function_float = OpTypePointer Function %float
          %20 = OpTypeFunction %v4float
+    %float_1 = OpConstant %float 1
 %acos_489247 = OpFunction %void None %9
          %12 = OpLabel
       %arg_0 = OpVariable %_ptr_Function_float Function %8
         %res = OpVariable %_ptr_Function_float Function %8
-               OpStore %arg_0 %float_1
+               OpStore %arg_0 %float_0_87758255
          %18 = OpLoad %float %arg_0
          %16 = OpExtInst %float %17 Acos %18
                OpStore %res %16
@@ -58,12 +59,12 @@
                OpReturn
                OpFunctionEnd
 %fragment_main = OpFunction %void None %9
-         %28 = OpLabel
+         %29 = OpLabel
-         %29 = OpFunctionCall %void %acos_489247
+         %30 = OpFunctionCall %void %acos_489247
                OpReturn
                OpFunctionEnd
 %compute_main = OpFunction %void None %9
-         %31 = OpLabel
+         %32 = OpLabel
-         %32 = OpFunctionCall %void %acos_489247
+         %33 = OpFunctionCall %void %acos_489247
                OpReturn
                OpFunctionEnd

test/tint/builtins/gen/var/acos/489247.wgsl.expected.wgsl

@@ -1,5 +1,5 @@
 fn acos_489247() {
-  var arg_0 = 1.0f;
+  var arg_0 = 0.87758255f;
   var res : f32 = acos(arg_0);
 }
 

test/tint/builtins/gen/var/acos/4dac75.wgsl

@@ -0,0 +1,44 @@
+// Copyright 2022 The Tint Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+////////////////////////////////////////////////////////////////////////////////
+// File generated by tools/src/cmd/gen
+// using the template:
+//   test/tint/builtins/gen/gen.wgsl.tmpl
+//
+// Do not modify this file directly
+////////////////////////////////////////////////////////////////////////////////
+
+
+// fn acos(vec<4, fa>) -> vec<4, fa>
+fn acos_4dac75() {
+  const arg_0 = vec4(0.87758256189);
+  var res = acos(arg_0);
+}
+
+@vertex
+fn vertex_main() -> @builtin(position) vec4<f32> {
+  acos_4dac75();
+  return vec4<f32>();
+}
+
+@fragment
+fn fragment_main() {
+  acos_4dac75();
+}
+
+@compute @workgroup_size(1)
+fn compute_main() {
+  acos_4dac75();
+}

test/tint/builtins/gen/var/acos/4dac75.wgsl.expected.dxc.hlsl

@@ -0,0 +1,30 @@
+void acos_4dac75() {
+  float4 res = (0.5f).xxxx;
+}
+
+struct tint_symbol {
+  float4 value : SV_Position;
+};
+
+float4 vertex_main_inner() {
+  acos_4dac75();
+  return (0.0f).xxxx;
+}
+
+tint_symbol vertex_main() {
+  const float4 inner_result = vertex_main_inner();
+  tint_symbol wrapper_result = (tint_symbol)0;
+  wrapper_result.value = inner_result;
+  return wrapper_result;
+}
+
+void fragment_main() {
+  acos_4dac75();
+  return;
+}
+
+[numthreads(1, 1, 1)]
+void compute_main() {
+  acos_4dac75();
+  return;
+}