tint: const eval of length builtin

Bug: tint:1581
Change-Id: Ie6dc9da6b48c606af03da023c835ec36a99dd362
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/110981
Reviewed-by: Dan Sinclair <dsinclair@chromium.org>
Kokoro: Kokoro <noreply+kokoro@google.com>
Commit-Queue: Antonio Maiorano <amaiorano@google.com>

test/tint/builtins/gen/literal/length/056071.wgsl

@@ -23,7 +23,7 @@
 
 // fn length(vec<3, f32>) -> f32
 fn length_056071() {
-  var res: f32 = length(vec3<f32>(1.f));
+  var res: f32 = length(vec3<f32>(0.f));
 }
 
 @vertex

test/tint/builtins/gen/literal/length/056071.wgsl.expected.dxc.hlsl

@@ -1,5 +1,5 @@
 void length_056071() {
-  float res = length((1.0f).xxx);
+  float res = 0.0f;
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/length/056071.wgsl.expected.fxc.hlsl

@@ -1,5 +1,5 @@
 void length_056071() {
-  float res = length((1.0f).xxx);
+  float res = 0.0f;
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/length/056071.wgsl.expected.glsl

@@ -1,7 +1,7 @@
 #version 310 es
 
 void length_056071() {
-  float res = length(vec3(1.0f));
+  float res = 0.0f;
 }
 
 vec4 vertex_main() {
@@ -21,7 +21,7 @@ void main() {
 precision mediump float;
 
 void length_056071() {
-  float res = length(vec3(1.0f));
+  float res = 0.0f;
 }
 
 void fragment_main() {
@@ -35,7 +35,7 @@ void main() {
 #version 310 es
 
 void length_056071() {
-  float res = length(vec3(1.0f));
+  float res = 0.0f;
 }
 
 void compute_main() {

test/tint/builtins/gen/literal/length/056071.wgsl.expected.msl

@@ -2,7 +2,7 @@
 
 using namespace metal;
 void length_056071() {
-  float res = length(float3(1.0f));
+  float res = 0.0f;
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/length/056071.wgsl.expected.spvasm

@@ -1,10 +1,9 @@
 ; SPIR-V
 ; Version: 1.3
 ; Generator: Google Tint Compiler; 0
-; Bound: 33
+; Bound: 29
 ; 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"
@@ -31,37 +30,34 @@
 %vertex_point_size = OpVariable %_ptr_Output_float Output %8
        %void = OpTypeVoid
           %9 = OpTypeFunction %void
-    %v3float = OpTypeVector %float 3
-    %float_1 = OpConstant %float 1
-         %17 = OpConstantComposite %v3float %float_1 %float_1 %float_1
 %_ptr_Function_float = OpTypePointer Function %float
-         %20 = OpTypeFunction %v4float
+         %15 = OpTypeFunction %v4float
+    %float_1 = OpConstant %float 1
 %length_056071 = OpFunction %void None %9
          %12 = OpLabel
         %res = OpVariable %_ptr_Function_float Function %8
-         %13 = OpExtInst %float %14 Length %17
-               OpStore %res %13
+               OpStore %res %8
                OpReturn
                OpFunctionEnd
-%vertex_main_inner = OpFunction %v4float None %20
-         %22 = OpLabel
-         %23 = OpFunctionCall %void %length_056071
+%vertex_main_inner = OpFunction %v4float None %15
+         %17 = OpLabel
+         %18 = OpFunctionCall %void %length_056071
                OpReturnValue %5
                OpFunctionEnd
 %vertex_main = OpFunction %void None %9
-         %25 = OpLabel
-         %26 = OpFunctionCall %v4float %vertex_main_inner
-               OpStore %value %26
+         %20 = OpLabel
+         %21 = OpFunctionCall %v4float %vertex_main_inner
+               OpStore %value %21
                OpStore %vertex_point_size %float_1
                OpReturn
                OpFunctionEnd
 %fragment_main = OpFunction %void None %9
-         %28 = OpLabel
-         %29 = OpFunctionCall %void %length_056071
+         %24 = OpLabel
+         %25 = OpFunctionCall %void %length_056071
                OpReturn
                OpFunctionEnd
 %compute_main = OpFunction %void None %9
-         %31 = OpLabel
-         %32 = OpFunctionCall %void %length_056071
+         %27 = OpLabel
+         %28 = OpFunctionCall %void %length_056071
                OpReturn
                OpFunctionEnd

test/tint/builtins/gen/literal/length/056071.wgsl.expected.wgsl

@@ -1,5 +1,5 @@
 fn length_056071() {
-  var res : f32 = length(vec3<f32>(1.0f));
+  var res : f32 = length(vec3<f32>(0.0f));
 }
 
 @vertex

test/tint/builtins/gen/literal/length/3f0e13.wgsl

@@ -25,7 +25,7 @@ enable f16;
 
 // fn length(vec<2, f16>) -> f16
 fn length_3f0e13() {
-  var res: f16 = length(vec2<f16>(1.h));
+  var res: f16 = length(vec2<f16>(0.h));
 }
 
 @vertex

test/tint/builtins/gen/literal/length/3f0e13.wgsl.expected.dxc.hlsl

@@ -1,5 +1,5 @@
 void length_3f0e13() {
-  float16_t res = length((float16_t(1.0h)).xx);
+  float16_t res = float16_t(0.0h);
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/length/3f0e13.wgsl.expected.glsl

@@ -2,7 +2,7 @@
 #extension GL_AMD_gpu_shader_half_float : require
 
 void length_3f0e13() {
-  float16_t res = length(f16vec2(1.0hf));
+  float16_t res = 0.0hf;
 }
 
 vec4 vertex_main() {
@@ -23,7 +23,7 @@ void main() {
 precision mediump float;
 
 void length_3f0e13() {
-  float16_t res = length(f16vec2(1.0hf));
+  float16_t res = 0.0hf;
 }
 
 void fragment_main() {
@@ -38,7 +38,7 @@ void main() {
 #extension GL_AMD_gpu_shader_half_float : require
 
 void length_3f0e13() {
-  float16_t res = length(f16vec2(1.0hf));
+  float16_t res = 0.0hf;
 }
 
 void compute_main() {

test/tint/builtins/gen/literal/length/3f0e13.wgsl.expected.msl

@@ -2,7 +2,7 @@
 
 using namespace metal;
 void length_3f0e13() {
-  half res = length(half2(1.0h));
+  half res = 0.0h;
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/length/3f0e13.wgsl.expected.spvasm

@@ -1,14 +1,13 @@
 ; SPIR-V
 ; Version: 1.3
 ; Generator: Google Tint Compiler; 0
-; Bound: 36
+; Bound: 31
 ; 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"
@@ -36,39 +35,35 @@
        %void = OpTypeVoid
           %9 = OpTypeFunction %void
        %half = OpTypeFloat 16
-     %v2half = OpTypeVector %half 2
-%half_0x1p_0 = OpConstant %half 0x1p+0
-         %18 = OpConstantComposite %v2half %half_0x1p_0 %half_0x1p_0
+         %14 = OpConstantNull %half
 %_ptr_Function_half = OpTypePointer Function %half
-         %21 = OpConstantNull %half
-         %22 = OpTypeFunction %v4float
+         %17 = OpTypeFunction %v4float
     %float_1 = OpConstant %float 1
 %length_3f0e13 = OpFunction %void None %9
          %12 = OpLabel
-        %res = OpVariable %_ptr_Function_half Function %21
-         %13 = OpExtInst %half %15 Length %18
-               OpStore %res %13
+        %res = OpVariable %_ptr_Function_half Function %14
+               OpStore %res %14
                OpReturn
                OpFunctionEnd
-%vertex_main_inner = OpFunction %v4float None %22
-         %24 = OpLabel
-         %25 = OpFunctionCall %void %length_3f0e13
+%vertex_main_inner = OpFunction %v4float None %17
+         %19 = OpLabel
+         %20 = OpFunctionCall %void %length_3f0e13
                OpReturnValue %5
                OpFunctionEnd
 %vertex_main = OpFunction %void None %9
-         %27 = OpLabel
-         %28 = OpFunctionCall %v4float %vertex_main_inner
-               OpStore %value %28
+         %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
-         %31 = OpLabel
-         %32 = OpFunctionCall %void %length_3f0e13
+         %26 = OpLabel
+         %27 = OpFunctionCall %void %length_3f0e13
                OpReturn
                OpFunctionEnd
 %compute_main = OpFunction %void None %9
-         %34 = OpLabel
-         %35 = OpFunctionCall %void %length_3f0e13
+         %29 = OpLabel
+         %30 = OpFunctionCall %void %length_3f0e13
                OpReturn
                OpFunctionEnd

test/tint/builtins/gen/literal/length/3f0e13.wgsl.expected.wgsl

@@ -1,7 +1,7 @@
 enable f16;
 
 fn length_3f0e13() {
-  var res : f16 = length(vec2<f16>(1.0h));
+  var res : f16 = length(vec2<f16>(0.0h));
 }
 
 @vertex

test/tint/builtins/gen/literal/length/555aba.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 length(vec<3, fa>) -> fa
+fn length_555aba() {
+  var res = length(vec3(0.));
+}
+
+@vertex
+fn vertex_main() -> @builtin(position) vec4<f32> {
+  length_555aba();
+  return vec4<f32>();
+}
+
+@fragment
+fn fragment_main() {
+  length_555aba();
+}
+
+@compute @workgroup_size(1)
+fn compute_main() {
+  length_555aba();
+}

test/tint/builtins/gen/literal/length/555aba.wgsl.expected.dxc.hlsl

@@ -0,0 +1,30 @@
+void length_555aba() {
+  float res = 0.0f;
+}
+
+struct tint_symbol {
+  float4 value : SV_Position;
+};
+
+float4 vertex_main_inner() {
+  length_555aba();
+  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() {
+  length_555aba();
+  return;
+}
+
+[numthreads(1, 1, 1)]
+void compute_main() {
+  length_555aba();
+  return;
+}

test/tint/builtins/gen/literal/length/555aba.wgsl.expected.fxc.hlsl

@@ -0,0 +1,30 @@
+void length_555aba() {
+  float res = 0.0f;
+}
+
+struct tint_symbol {
+  float4 value : SV_Position;
+};
+
+float4 vertex_main_inner() {
+  length_555aba();
+  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() {
+  length_555aba();
+  return;
+}
+
+[numthreads(1, 1, 1)]
+void compute_main() {
+  length_555aba();
+  return;
+}

test/tint/builtins/gen/literal/length/555aba.wgsl.expected.glsl

@@ -0,0 +1,49 @@
+#version 310 es
+
+void length_555aba() {
+  float res = 0.0f;
+}
+
+vec4 vertex_main() {
+  length_555aba();
+  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 length_555aba() {
+  float res = 0.0f;
+}
+
+void fragment_main() {
+  length_555aba();
+}
+
+void main() {
+  fragment_main();
+  return;
+}
+#version 310 es
+
+void length_555aba() {
+  float res = 0.0f;
+}
+
+void compute_main() {
+  length_555aba();
+}
+
+layout(local_size_x = 1, local_size_y = 1, local_size_z = 1) in;
+void main() {
+  compute_main();
+  return;
+}

test/tint/builtins/gen/literal/length/555aba.wgsl.expected.msl

@@ -0,0 +1,33 @@
+#include <metal_stdlib>
+
+using namespace metal;
+void length_555aba() {
+  float res = 0.0f;
+}
+
+struct tint_symbol {
+  float4 value [[position]];
+};
+
+float4 vertex_main_inner() {
+  length_555aba();
+  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() {
+  length_555aba();
+  return;
+}
+
+kernel void compute_main() {
+  length_555aba();
+  return;
+}
+

test/tint/builtins/gen/literal/length/555aba.wgsl.expected.spvasm

@@ -0,0 +1,63 @@
+; SPIR-V
+; Version: 1.3
+; Generator: Google Tint Compiler; 0
+; Bound: 29
+; 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 %length_555aba "length_555aba"
+               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
+%_ptr_Function_float = OpTypePointer Function %float
+         %15 = OpTypeFunction %v4float
+    %float_1 = OpConstant %float 1
+%length_555aba = OpFunction %void None %9
+         %12 = OpLabel
+        %res = OpVariable %_ptr_Function_float Function %8
+               OpStore %res %8
+               OpReturn
+               OpFunctionEnd
+%vertex_main_inner = OpFunction %v4float None %15
+         %17 = OpLabel
+         %18 = OpFunctionCall %void %length_555aba
+               OpReturnValue %5
+               OpFunctionEnd
+%vertex_main = OpFunction %void None %9
+         %20 = OpLabel
+         %21 = OpFunctionCall %v4float %vertex_main_inner
+               OpStore %value %21
+               OpStore %vertex_point_size %float_1
+               OpReturn
+               OpFunctionEnd
+%fragment_main = OpFunction %void None %9
+         %24 = OpLabel
+         %25 = OpFunctionCall %void %length_555aba
+               OpReturn
+               OpFunctionEnd
+%compute_main = OpFunction %void None %9
+         %27 = OpLabel
+         %28 = OpFunctionCall %void %length_555aba
+               OpReturn
+               OpFunctionEnd

test/tint/builtins/gen/literal/length/555aba.wgsl.expected.wgsl

@@ -0,0 +1,19 @@
+fn length_555aba() {
+  var res = length(vec3(0.0));
+}
+
+@vertex
+fn vertex_main() -> @builtin(position) vec4<f32> {
+  length_555aba();
+  return vec4<f32>();
+}
+
+@fragment
+fn fragment_main() {
+  length_555aba();
+}
+
+@compute @workgroup_size(1)
+fn compute_main() {
+  length_555aba();
+}

test/tint/builtins/gen/literal/length/5b1a9b.wgsl

@@ -25,7 +25,7 @@ enable f16;
 
 // fn length(vec<4, f16>) -> f16
 fn length_5b1a9b() {
-  var res: f16 = length(vec4<f16>(1.h));
+  var res: f16 = length(vec4<f16>(0.h));
 }
 
 @vertex

test/tint/builtins/gen/literal/length/5b1a9b.wgsl.expected.dxc.hlsl

@@ -1,5 +1,5 @@
 void length_5b1a9b() {
-  float16_t res = length((float16_t(1.0h)).xxxx);
+  float16_t res = float16_t(0.0h);
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/length/5b1a9b.wgsl.expected.glsl

@@ -2,7 +2,7 @@
 #extension GL_AMD_gpu_shader_half_float : require
 
 void length_5b1a9b() {
-  float16_t res = length(f16vec4(1.0hf));
+  float16_t res = 0.0hf;
 }
 
 vec4 vertex_main() {
@@ -23,7 +23,7 @@ void main() {
 precision mediump float;
 
 void length_5b1a9b() {
-  float16_t res = length(f16vec4(1.0hf));
+  float16_t res = 0.0hf;
 }
 
 void fragment_main() {
@@ -38,7 +38,7 @@ void main() {
 #extension GL_AMD_gpu_shader_half_float : require
 
 void length_5b1a9b() {
-  float16_t res = length(f16vec4(1.0hf));
+  float16_t res = 0.0hf;
 }
 
 void compute_main() {

test/tint/builtins/gen/literal/length/5b1a9b.wgsl.expected.msl

@@ -2,7 +2,7 @@
 
 using namespace metal;
 void length_5b1a9b() {
-  half res = length(half4(1.0h));
+  half res = 0.0h;
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/length/5b1a9b.wgsl.expected.spvasm

@@ -1,14 +1,13 @@
 ; SPIR-V
 ; Version: 1.3
 ; Generator: Google Tint Compiler; 0
-; Bound: 36
+; Bound: 31
 ; 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"
@@ -36,39 +35,35 @@
        %void = OpTypeVoid
           %9 = OpTypeFunction %void
        %half = OpTypeFloat 16
-     %v4half = OpTypeVector %half 4
-%half_0x1p_0 = OpConstant %half 0x1p+0
-         %18 = OpConstantComposite %v4half %half_0x1p_0 %half_0x1p_0 %half_0x1p_0 %half_0x1p_0
+         %14 = OpConstantNull %half
 %_ptr_Function_half = OpTypePointer Function %half
-         %21 = OpConstantNull %half
-         %22 = OpTypeFunction %v4float
+         %17 = OpTypeFunction %v4float
     %float_1 = OpConstant %float 1
 %length_5b1a9b = OpFunction %void None %9
          %12 = OpLabel
-        %res = OpVariable %_ptr_Function_half Function %21
-         %13 = OpExtInst %half %15 Length %18
-               OpStore %res %13
+        %res = OpVariable %_ptr_Function_half Function %14
+               OpStore %res %14
                OpReturn
                OpFunctionEnd
-%vertex_main_inner = OpFunction %v4float None %22
-         %24 = OpLabel
-         %25 = OpFunctionCall %void %length_5b1a9b
+%vertex_main_inner = OpFunction %v4float None %17
+         %19 = OpLabel
+         %20 = OpFunctionCall %void %length_5b1a9b
                OpReturnValue %5
                OpFunctionEnd
 %vertex_main = OpFunction %void None %9
-         %27 = OpLabel
-         %28 = OpFunctionCall %v4float %vertex_main_inner
-               OpStore %value %28
+         %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
-         %31 = OpLabel
-         %32 = OpFunctionCall %void %length_5b1a9b
+         %26 = OpLabel
+         %27 = OpFunctionCall %void %length_5b1a9b
                OpReturn
                OpFunctionEnd
 %compute_main = OpFunction %void None %9
-         %34 = OpLabel
-         %35 = OpFunctionCall %void %length_5b1a9b
+         %29 = OpLabel
+         %30 = OpFunctionCall %void %length_5b1a9b
                OpReturn
                OpFunctionEnd

test/tint/builtins/gen/literal/length/5b1a9b.wgsl.expected.wgsl

@@ -1,7 +1,7 @@
 enable f16;
 
 fn length_5b1a9b() {
-  var res : f16 = length(vec4<f16>(1.0h));
+  var res : f16 = length(vec4<f16>(0.0h));
 }
 
 @vertex

test/tint/builtins/gen/literal/length/602a17.wgsl

@@ -23,7 +23,7 @@
 
 // fn length(f32) -> f32
 fn length_602a17() {
-  var res: f32 = length(1.f);
+  var res: f32 = length(0.f);
 }
 
 @vertex

test/tint/builtins/gen/literal/length/602a17.wgsl.expected.dxc.hlsl

@@ -1,5 +1,5 @@
 void length_602a17() {
-  float res = length(1.0f);
+  float res = 0.0f;
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/length/602a17.wgsl.expected.fxc.hlsl

@@ -1,5 +1,5 @@
 void length_602a17() {
-  float res = length(1.0f);
+  float res = 0.0f;
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/length/602a17.wgsl.expected.glsl

@@ -1,7 +1,7 @@
 #version 310 es
 
 void length_602a17() {
-  float res = length(1.0f);
+  float res = 0.0f;
 }
 
 vec4 vertex_main() {
@@ -21,7 +21,7 @@ void main() {
 precision mediump float;
 
 void length_602a17() {
-  float res = length(1.0f);
+  float res = 0.0f;
 }
 
 void fragment_main() {
@@ -35,7 +35,7 @@ void main() {
 #version 310 es
 
 void length_602a17() {
-  float res = length(1.0f);
+  float res = 0.0f;
 }
 
 void compute_main() {

test/tint/builtins/gen/literal/length/602a17.wgsl.expected.msl

@@ -2,7 +2,7 @@
 
 using namespace metal;
 void length_602a17() {
-  float res = fabs(1.0f);
+  float res = 0.0f;
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/length/602a17.wgsl.expected.spvasm

@@ -1,10 +1,9 @@
 ; SPIR-V
 ; Version: 1.3
 ; Generator: Google Tint Compiler; 0
-; Bound: 31
+; Bound: 29
 ; 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 +30,34 @@
 %vertex_point_size = OpVariable %_ptr_Output_float Output %8
        %void = OpTypeVoid
           %9 = OpTypeFunction %void
-    %float_1 = OpConstant %float 1
 %_ptr_Function_float = OpTypePointer Function %float
-         %18 = OpTypeFunction %v4float
+         %15 = OpTypeFunction %v4float
+    %float_1 = OpConstant %float 1
 %length_602a17 = OpFunction %void None %9
          %12 = OpLabel
         %res = OpVariable %_ptr_Function_float Function %8
-         %13 = OpExtInst %float %14 Length %float_1
-               OpStore %res %13
+               OpStore %res %8
                OpReturn
                OpFunctionEnd
-%vertex_main_inner = OpFunction %v4float None %18
-         %20 = OpLabel
-         %21 = OpFunctionCall %void %length_602a17
+%vertex_main_inner = OpFunction %v4float None %15
+         %17 = OpLabel
+         %18 = OpFunctionCall %void %length_602a17
                OpReturnValue %5
                OpFunctionEnd
 %vertex_main = OpFunction %void None %9
-         %23 = OpLabel
-         %24 = OpFunctionCall %v4float %vertex_main_inner
-               OpStore %value %24
+         %20 = OpLabel
+         %21 = OpFunctionCall %v4float %vertex_main_inner
+               OpStore %value %21
                OpStore %vertex_point_size %float_1
                OpReturn
                OpFunctionEnd
 %fragment_main = OpFunction %void None %9
-         %26 = OpLabel
-         %27 = OpFunctionCall %void %length_602a17
+         %24 = OpLabel
+         %25 = OpFunctionCall %void %length_602a17
                OpReturn
                OpFunctionEnd
 %compute_main = OpFunction %void None %9
-         %29 = OpLabel
-         %30 = OpFunctionCall %void %length_602a17
+         %27 = OpLabel
+         %28 = OpFunctionCall %void %length_602a17
                OpReturn
                OpFunctionEnd

test/tint/builtins/gen/literal/length/602a17.wgsl.expected.wgsl

@@ -1,5 +1,5 @@
 fn length_602a17() {
-  var res : f32 = length(1.0f);
+  var res : f32 = length(0.0f);
 }
 
 @vertex

test/tint/builtins/gen/literal/length/7b4741.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 length(vec<2, fa>) -> fa
+fn length_7b4741() {
+  var res = length(vec2(0.));
+}
+
+@vertex
+fn vertex_main() -> @builtin(position) vec4<f32> {
+  length_7b4741();
+  return vec4<f32>();
+}
+
+@fragment
+fn fragment_main() {
+  length_7b4741();
+}
+
+@compute @workgroup_size(1)
+fn compute_main() {
+  length_7b4741();
+}

test/tint/builtins/gen/literal/length/7b4741.wgsl.expected.dxc.hlsl

@@ -0,0 +1,30 @@
+void length_7b4741() {
+  float res = 0.0f;
+}
+
+struct tint_symbol {
+  float4 value : SV_Position;
+};
+
+float4 vertex_main_inner() {
+  length_7b4741();
+  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() {
+  length_7b4741();
+  return;
+}
+
+[numthreads(1, 1, 1)]
+void compute_main() {
+  length_7b4741();
+  return;
+}

test/tint/builtins/gen/literal/length/7b4741.wgsl.expected.fxc.hlsl

@@ -0,0 +1,30 @@
+void length_7b4741() {
+  float res = 0.0f;
+}
+
+struct tint_symbol {
+  float4 value : SV_Position;
+};
+
+float4 vertex_main_inner() {
+  length_7b4741();
+  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() {
+  length_7b4741();
+  return;
+}
+
+[numthreads(1, 1, 1)]
+void compute_main() {
+  length_7b4741();
+  return;
+}

test/tint/builtins/gen/literal/length/7b4741.wgsl.expected.glsl

@@ -0,0 +1,49 @@
+#version 310 es
+
+void length_7b4741() {
+  float res = 0.0f;
+}
+
+vec4 vertex_main() {
+  length_7b4741();
+  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 length_7b4741() {
+  float res = 0.0f;
+}
+
+void fragment_main() {
+  length_7b4741();
+}
+
+void main() {
+  fragment_main();
+  return;
+}
+#version 310 es
+
+void length_7b4741() {
+  float res = 0.0f;
+}
+
+void compute_main() {
+  length_7b4741();
+}
+
+layout(local_size_x = 1, local_size_y = 1, local_size_z = 1) in;
+void main() {
+  compute_main();
+  return;
+}

test/tint/builtins/gen/literal/length/7b4741.wgsl.expected.msl

@@ -0,0 +1,33 @@
+#include <metal_stdlib>
+
+using namespace metal;
+void length_7b4741() {
+  float res = 0.0f;
+}
+
+struct tint_symbol {
+  float4 value [[position]];
+};
+
+float4 vertex_main_inner() {
+  length_7b4741();
+  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() {
+  length_7b4741();
+  return;
+}
+
+kernel void compute_main() {
+  length_7b4741();
+  return;
+}
+

test/tint/builtins/gen/literal/length/7b4741.wgsl.expected.spvasm

@@ -0,0 +1,63 @@
+; SPIR-V
+; Version: 1.3
+; Generator: Google Tint Compiler; 0
+; Bound: 29
+; 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 %length_7b4741 "length_7b4741"
+               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
+%_ptr_Function_float = OpTypePointer Function %float
+         %15 = OpTypeFunction %v4float
+    %float_1 = OpConstant %float 1
+%length_7b4741 = OpFunction %void None %9
+         %12 = OpLabel
+        %res = OpVariable %_ptr_Function_float Function %8
+               OpStore %res %8
+               OpReturn
+               OpFunctionEnd
+%vertex_main_inner = OpFunction %v4float None %15
+         %17 = OpLabel
+         %18 = OpFunctionCall %void %length_7b4741
+               OpReturnValue %5
+               OpFunctionEnd
+%vertex_main = OpFunction %void None %9
+         %20 = OpLabel
+         %21 = OpFunctionCall %v4float %vertex_main_inner
+               OpStore %value %21
+               OpStore %vertex_point_size %float_1
+               OpReturn
+               OpFunctionEnd
+%fragment_main = OpFunction %void None %9
+         %24 = OpLabel
+         %25 = OpFunctionCall %void %length_7b4741
+               OpReturn
+               OpFunctionEnd
+%compute_main = OpFunction %void None %9
+         %27 = OpLabel
+         %28 = OpFunctionCall %void %length_7b4741
+               OpReturn
+               OpFunctionEnd

test/tint/builtins/gen/literal/length/7b4741.wgsl.expected.wgsl

@@ -0,0 +1,19 @@
+fn length_7b4741() {
+  var res = length(vec2(0.0));
+}
+
+@vertex
+fn vertex_main() -> @builtin(position) vec4<f32> {
+  length_7b4741();
+  return vec4<f32>();
+}
+
+@fragment
+fn fragment_main() {
+  length_7b4741();
+}
+
+@compute @workgroup_size(1)
+fn compute_main() {
+  length_7b4741();
+}

test/tint/builtins/gen/literal/length/936ad5.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 length(fa) -> fa
+fn length_936ad5() {
+  var res = length(0.);
+}
+
+@vertex
+fn vertex_main() -> @builtin(position) vec4<f32> {
+  length_936ad5();
+  return vec4<f32>();
+}
+
+@fragment
+fn fragment_main() {
+  length_936ad5();
+}
+
+@compute @workgroup_size(1)
+fn compute_main() {
+  length_936ad5();
+}

test/tint/builtins/gen/literal/length/936ad5.wgsl.expected.dxc.hlsl

@@ -0,0 +1,30 @@
+void length_936ad5() {
+  float res = 0.0f;
+}
+
+struct tint_symbol {
+  float4 value : SV_Position;
+};
+
+float4 vertex_main_inner() {
+  length_936ad5();
+  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() {
+  length_936ad5();
+  return;
+}
+
+[numthreads(1, 1, 1)]
+void compute_main() {
+  length_936ad5();
+  return;
+}

test/tint/builtins/gen/literal/length/936ad5.wgsl.expected.fxc.hlsl

@@ -0,0 +1,30 @@
+void length_936ad5() {
+  float res = 0.0f;
+}
+
+struct tint_symbol {
+  float4 value : SV_Position;
+};
+
+float4 vertex_main_inner() {
+  length_936ad5();
+  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() {
+  length_936ad5();
+  return;
+}
+
+[numthreads(1, 1, 1)]
+void compute_main() {
+  length_936ad5();
+  return;
+}

test/tint/builtins/gen/literal/length/936ad5.wgsl.expected.glsl

@@ -0,0 +1,49 @@
+#version 310 es
+
+void length_936ad5() {
+  float res = 0.0f;
+}
+
+vec4 vertex_main() {
+  length_936ad5();
+  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 length_936ad5() {
+  float res = 0.0f;
+}
+
+void fragment_main() {
+  length_936ad5();
+}
+
+void main() {
+  fragment_main();
+  return;
+}
+#version 310 es
+
+void length_936ad5() {
+  float res = 0.0f;
+}
+
+void compute_main() {
+  length_936ad5();
+}
+
+layout(local_size_x = 1, local_size_y = 1, local_size_z = 1) in;
+void main() {
+  compute_main();
+  return;
+}

test/tint/builtins/gen/literal/length/936ad5.wgsl.expected.msl

@@ -0,0 +1,33 @@
+#include <metal_stdlib>
+
+using namespace metal;
+void length_936ad5() {
+  float res = 0.0f;
+}
+
+struct tint_symbol {
+  float4 value [[position]];
+};
+
+float4 vertex_main_inner() {
+  length_936ad5();
+  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() {
+  length_936ad5();
+  return;
+}
+
+kernel void compute_main() {
+  length_936ad5();
+  return;
+}
+

test/tint/builtins/gen/literal/length/936ad5.wgsl.expected.spvasm

@@ -0,0 +1,63 @@
+; SPIR-V
+; Version: 1.3
+; Generator: Google Tint Compiler; 0
+; Bound: 29
+; 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 %length_936ad5 "length_936ad5"
+               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
+%_ptr_Function_float = OpTypePointer Function %float
+         %15 = OpTypeFunction %v4float
+    %float_1 = OpConstant %float 1
+%length_936ad5 = OpFunction %void None %9
+         %12 = OpLabel
+        %res = OpVariable %_ptr_Function_float Function %8
+               OpStore %res %8
+               OpReturn
+               OpFunctionEnd
+%vertex_main_inner = OpFunction %v4float None %15
+         %17 = OpLabel
+         %18 = OpFunctionCall %void %length_936ad5
+               OpReturnValue %5
+               OpFunctionEnd
+%vertex_main = OpFunction %void None %9
+         %20 = OpLabel
+         %21 = OpFunctionCall %v4float %vertex_main_inner
+               OpStore %value %21
+               OpStore %vertex_point_size %float_1
+               OpReturn
+               OpFunctionEnd
+%fragment_main = OpFunction %void None %9
+         %24 = OpLabel
+         %25 = OpFunctionCall %void %length_936ad5
+               OpReturn
+               OpFunctionEnd
+%compute_main = OpFunction %void None %9
+         %27 = OpLabel
+         %28 = OpFunctionCall %void %length_936ad5
+               OpReturn
+               OpFunctionEnd

test/tint/builtins/gen/literal/length/936ad5.wgsl.expected.wgsl

@@ -0,0 +1,19 @@
+fn length_936ad5() {
+  var res = length(0.0);
+}
+
+@vertex
+fn vertex_main() -> @builtin(position) vec4<f32> {
+  length_936ad5();
+  return vec4<f32>();
+}
+
+@fragment
+fn fragment_main() {
+  length_936ad5();
+}
+
+@compute @workgroup_size(1)
+fn compute_main() {
+  length_936ad5();
+}

test/tint/builtins/gen/literal/length/afde8b.wgsl

@@ -23,7 +23,7 @@
 
 // fn length(vec<2, f32>) -> f32
 fn length_afde8b() {
-  var res: f32 = length(vec2<f32>(1.f));
+  var res: f32 = length(vec2<f32>(0.f));
 }
 
 @vertex

test/tint/builtins/gen/literal/length/afde8b.wgsl.expected.dxc.hlsl

@@ -1,5 +1,5 @@
 void length_afde8b() {
-  float res = length((1.0f).xx);
+  float res = 0.0f;
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/length/afde8b.wgsl.expected.fxc.hlsl

@@ -1,5 +1,5 @@
 void length_afde8b() {
-  float res = length((1.0f).xx);
+  float res = 0.0f;
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/length/afde8b.wgsl.expected.glsl

@@ -1,7 +1,7 @@
 #version 310 es
 
 void length_afde8b() {
-  float res = length(vec2(1.0f));
+  float res = 0.0f;
 }
 
 vec4 vertex_main() {
@@ -21,7 +21,7 @@ void main() {
 precision mediump float;
 
 void length_afde8b() {
-  float res = length(vec2(1.0f));
+  float res = 0.0f;
 }
 
 void fragment_main() {
@@ -35,7 +35,7 @@ void main() {
 #version 310 es
 
 void length_afde8b() {
-  float res = length(vec2(1.0f));
+  float res = 0.0f;
 }
 
 void compute_main() {

test/tint/builtins/gen/literal/length/afde8b.wgsl.expected.msl

@@ -2,7 +2,7 @@
 
 using namespace metal;
 void length_afde8b() {
-  float res = length(float2(1.0f));
+  float res = 0.0f;
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/length/afde8b.wgsl.expected.spvasm

@@ -1,10 +1,9 @@
 ; SPIR-V
 ; Version: 1.3
 ; Generator: Google Tint Compiler; 0
-; Bound: 33
+; Bound: 29
 ; 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"
@@ -31,37 +30,34 @@
 %vertex_point_size = OpVariable %_ptr_Output_float Output %8
        %void = OpTypeVoid
           %9 = OpTypeFunction %void
-    %v2float = OpTypeVector %float 2
-    %float_1 = OpConstant %float 1
-         %17 = OpConstantComposite %v2float %float_1 %float_1
 %_ptr_Function_float = OpTypePointer Function %float
-         %20 = OpTypeFunction %v4float
+         %15 = OpTypeFunction %v4float
+    %float_1 = OpConstant %float 1
 %length_afde8b = OpFunction %void None %9
          %12 = OpLabel
         %res = OpVariable %_ptr_Function_float Function %8
-         %13 = OpExtInst %float %14 Length %17
-               OpStore %res %13
+               OpStore %res %8
                OpReturn
                OpFunctionEnd
-%vertex_main_inner = OpFunction %v4float None %20
-         %22 = OpLabel
-         %23 = OpFunctionCall %void %length_afde8b
+%vertex_main_inner = OpFunction %v4float None %15
+         %17 = OpLabel
+         %18 = OpFunctionCall %void %length_afde8b
                OpReturnValue %5
                OpFunctionEnd
 %vertex_main = OpFunction %void None %9
-         %25 = OpLabel
-         %26 = OpFunctionCall %v4float %vertex_main_inner
-               OpStore %value %26
+         %20 = OpLabel
+         %21 = OpFunctionCall %v4float %vertex_main_inner
+               OpStore %value %21
                OpStore %vertex_point_size %float_1
                OpReturn
                OpFunctionEnd
 %fragment_main = OpFunction %void None %9
-         %28 = OpLabel
-         %29 = OpFunctionCall %void %length_afde8b
+         %24 = OpLabel
+         %25 = OpFunctionCall %void %length_afde8b
                OpReturn
                OpFunctionEnd
 %compute_main = OpFunction %void None %9
-         %31 = OpLabel
-         %32 = OpFunctionCall %void %length_afde8b
+         %27 = OpLabel
+         %28 = OpFunctionCall %void %length_afde8b
                OpReturn
                OpFunctionEnd

test/tint/builtins/gen/literal/length/afde8b.wgsl.expected.wgsl

@@ -1,5 +1,5 @@
 fn length_afde8b() {
-  var res : f32 = length(vec2<f32>(1.0f));
+  var res : f32 = length(vec2<f32>(0.0f));
 }
 
 @vertex

test/tint/builtins/gen/literal/length/ba16d6.wgsl

@@ -25,7 +25,7 @@ enable f16;
 
 // fn length(vec<3, f16>) -> f16
 fn length_ba16d6() {
-  var res: f16 = length(vec3<f16>(1.h));
+  var res: f16 = length(vec3<f16>(0.h));
 }
 
 @vertex

test/tint/builtins/gen/literal/length/ba16d6.wgsl.expected.dxc.hlsl

@@ -1,5 +1,5 @@
 void length_ba16d6() {
-  float16_t res = length((float16_t(1.0h)).xxx);
+  float16_t res = float16_t(0.0h);
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/length/ba16d6.wgsl.expected.glsl

@@ -2,7 +2,7 @@
 #extension GL_AMD_gpu_shader_half_float : require
 
 void length_ba16d6() {
-  float16_t res = length(f16vec3(1.0hf));
+  float16_t res = 0.0hf;
 }
 
 vec4 vertex_main() {
@@ -23,7 +23,7 @@ void main() {
 precision mediump float;
 
 void length_ba16d6() {
-  float16_t res = length(f16vec3(1.0hf));
+  float16_t res = 0.0hf;
 }
 
 void fragment_main() {
@@ -38,7 +38,7 @@ void main() {
 #extension GL_AMD_gpu_shader_half_float : require
 
 void length_ba16d6() {
-  float16_t res = length(f16vec3(1.0hf));
+  float16_t res = 0.0hf;
 }
 
 void compute_main() {

test/tint/builtins/gen/literal/length/ba16d6.wgsl.expected.msl

@@ -2,7 +2,7 @@
 
 using namespace metal;
 void length_ba16d6() {
-  half res = length(half3(1.0h));
+  half res = 0.0h;
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/length/ba16d6.wgsl.expected.spvasm

@@ -1,14 +1,13 @@
 ; SPIR-V
 ; Version: 1.3
 ; Generator: Google Tint Compiler; 0
-; Bound: 36
+; Bound: 31
 ; 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"
@@ -36,39 +35,35 @@
        %void = OpTypeVoid
           %9 = OpTypeFunction %void
        %half = OpTypeFloat 16
-     %v3half = OpTypeVector %half 3
-%half_0x1p_0 = OpConstant %half 0x1p+0
-         %18 = OpConstantComposite %v3half %half_0x1p_0 %half_0x1p_0 %half_0x1p_0
+         %14 = OpConstantNull %half
 %_ptr_Function_half = OpTypePointer Function %half
-         %21 = OpConstantNull %half
-         %22 = OpTypeFunction %v4float
+         %17 = OpTypeFunction %v4float
     %float_1 = OpConstant %float 1
 %length_ba16d6 = OpFunction %void None %9
          %12 = OpLabel
-        %res = OpVariable %_ptr_Function_half Function %21
-         %13 = OpExtInst %half %15 Length %18
-               OpStore %res %13
+        %res = OpVariable %_ptr_Function_half Function %14
+               OpStore %res %14
                OpReturn
                OpFunctionEnd
-%vertex_main_inner = OpFunction %v4float None %22
-         %24 = OpLabel
-         %25 = OpFunctionCall %void %length_ba16d6
+%vertex_main_inner = OpFunction %v4float None %17
+         %19 = OpLabel
+         %20 = OpFunctionCall %void %length_ba16d6
                OpReturnValue %5
                OpFunctionEnd
 %vertex_main = OpFunction %void None %9
-         %27 = OpLabel
-         %28 = OpFunctionCall %v4float %vertex_main_inner
-               OpStore %value %28
+         %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
-         %31 = OpLabel
-         %32 = OpFunctionCall %void %length_ba16d6
+         %26 = OpLabel
+         %27 = OpFunctionCall %void %length_ba16d6
                OpReturn
                OpFunctionEnd
 %compute_main = OpFunction %void None %9
-         %34 = OpLabel
-         %35 = OpFunctionCall %void %length_ba16d6
+         %29 = OpLabel
+         %30 = OpFunctionCall %void %length_ba16d6
                OpReturn
                OpFunctionEnd

test/tint/builtins/gen/literal/length/ba16d6.wgsl.expected.wgsl

@@ -1,7 +1,7 @@
 enable f16;
 
 fn length_ba16d6() {
-  var res : f16 = length(vec3<f16>(1.0h));
+  var res : f16 = length(vec3<f16>(0.0h));
 }
 
 @vertex

test/tint/builtins/gen/literal/length/becebf.wgsl

@@ -23,7 +23,7 @@
 
 // fn length(vec<4, f32>) -> f32
 fn length_becebf() {
-  var res: f32 = length(vec4<f32>(1.f));
+  var res: f32 = length(vec4<f32>(0.f));
 }
 
 @vertex

test/tint/builtins/gen/literal/length/becebf.wgsl.expected.dxc.hlsl

@@ -1,5 +1,5 @@
 void length_becebf() {
-  float res = length((1.0f).xxxx);
+  float res = 0.0f;
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/length/becebf.wgsl.expected.fxc.hlsl

@@ -1,5 +1,5 @@
 void length_becebf() {
-  float res = length((1.0f).xxxx);
+  float res = 0.0f;
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/length/becebf.wgsl.expected.glsl

@@ -1,7 +1,7 @@
 #version 310 es
 
 void length_becebf() {
-  float res = length(vec4(1.0f));
+  float res = 0.0f;
 }
 
 vec4 vertex_main() {
@@ -21,7 +21,7 @@ void main() {
 precision mediump float;
 
 void length_becebf() {
-  float res = length(vec4(1.0f));
+  float res = 0.0f;
 }
 
 void fragment_main() {
@@ -35,7 +35,7 @@ void main() {
 #version 310 es
 
 void length_becebf() {
-  float res = length(vec4(1.0f));
+  float res = 0.0f;
 }
 
 void compute_main() {

test/tint/builtins/gen/literal/length/becebf.wgsl.expected.msl

@@ -2,7 +2,7 @@
 
 using namespace metal;
 void length_becebf() {
-  float res = length(float4(1.0f));
+  float res = 0.0f;
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/length/becebf.wgsl.expected.spvasm

@@ -1,10 +1,9 @@
 ; SPIR-V
 ; Version: 1.3
 ; Generator: Google Tint Compiler; 0
-; Bound: 32
+; Bound: 29
 ; 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 +30,34 @@
 %vertex_point_size = OpVariable %_ptr_Output_float Output %8
        %void = OpTypeVoid
           %9 = OpTypeFunction %void
-    %float_1 = OpConstant %float 1
-         %16 = OpConstantComposite %v4float %float_1 %float_1 %float_1 %float_1
 %_ptr_Function_float = OpTypePointer Function %float
-         %19 = OpTypeFunction %v4float
+         %15 = OpTypeFunction %v4float
+    %float_1 = OpConstant %float 1
 %length_becebf = OpFunction %void None %9
          %12 = OpLabel
         %res = OpVariable %_ptr_Function_float Function %8
-         %13 = OpExtInst %float %14 Length %16
-               OpStore %res %13
+               OpStore %res %8
                OpReturn
                OpFunctionEnd
-%vertex_main_inner = OpFunction %v4float None %19
-         %21 = OpLabel
-         %22 = OpFunctionCall %void %length_becebf
+%vertex_main_inner = OpFunction %v4float None %15
+         %17 = OpLabel
+         %18 = OpFunctionCall %void %length_becebf
                OpReturnValue %5
                OpFunctionEnd
 %vertex_main = OpFunction %void None %9
-         %24 = OpLabel
-         %25 = OpFunctionCall %v4float %vertex_main_inner
-               OpStore %value %25
+         %20 = OpLabel
+         %21 = OpFunctionCall %v4float %vertex_main_inner
+               OpStore %value %21
                OpStore %vertex_point_size %float_1
                OpReturn
                OpFunctionEnd
 %fragment_main = OpFunction %void None %9
+         %24 = OpLabel
+         %25 = OpFunctionCall %void %length_becebf
+               OpReturn
+               OpFunctionEnd
+%compute_main = OpFunction %void None %9
          %27 = OpLabel
          %28 = OpFunctionCall %void %length_becebf
                OpReturn
                OpFunctionEnd
-%compute_main = OpFunction %void None %9
-         %30 = OpLabel
-         %31 = OpFunctionCall %void %length_becebf
-               OpReturn
-               OpFunctionEnd

test/tint/builtins/gen/literal/length/becebf.wgsl.expected.wgsl

@@ -1,5 +1,5 @@
 fn length_becebf() {
-  var res : f32 = length(vec4<f32>(1.0f));
+  var res : f32 = length(vec4<f32>(0.0f));
 }
 
 @vertex

test/tint/builtins/gen/literal/length/c158da.wgsl

@@ -25,7 +25,7 @@ enable f16;
 
 // fn length(f16) -> f16
 fn length_c158da() {
-  var res: f16 = length(1.h);
+  var res: f16 = length(0.h);
 }
 
 @vertex

test/tint/builtins/gen/literal/length/c158da.wgsl.expected.dxc.hlsl

@@ -1,5 +1,5 @@
 void length_c158da() {
-  float16_t res = length(float16_t(1.0h));
+  float16_t res = float16_t(0.0h);
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/length/c158da.wgsl.expected.glsl

@@ -2,7 +2,7 @@
 #extension GL_AMD_gpu_shader_half_float : require
 
 void length_c158da() {
-  float16_t res = length(1.0hf);
+  float16_t res = 0.0hf;
 }
 
 vec4 vertex_main() {
@@ -23,7 +23,7 @@ void main() {
 precision mediump float;
 
 void length_c158da() {
-  float16_t res = length(1.0hf);
+  float16_t res = 0.0hf;
 }
 
 void fragment_main() {
@@ -38,7 +38,7 @@ void main() {
 #extension GL_AMD_gpu_shader_half_float : require
 
 void length_c158da() {
-  float16_t res = length(1.0hf);
+  float16_t res = 0.0hf;
 }
 
 void compute_main() {

test/tint/builtins/gen/literal/length/c158da.wgsl.expected.msl

@@ -2,7 +2,7 @@
 
 using namespace metal;
 void length_c158da() {
-  half res = fabs(1.0h);
+  half res = 0.0h;
 }
 
 struct tint_symbol {

test/tint/builtins/gen/literal/length/c158da.wgsl.expected.spvasm

@@ -1,14 +1,13 @@
 ; SPIR-V
 ; Version: 1.3
 ; Generator: Google Tint Compiler; 0
-; Bound: 34
+; Bound: 31
 ; 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"
@@ -36,37 +35,35 @@
        %void = OpTypeVoid
           %9 = OpTypeFunction %void
        %half = OpTypeFloat 16
-%half_0x1p_0 = OpConstant %half 0x1p+0
+         %14 = OpConstantNull %half
 %_ptr_Function_half = OpTypePointer Function %half
-         %19 = OpConstantNull %half
-         %20 = OpTypeFunction %v4float
+         %17 = OpTypeFunction %v4float
     %float_1 = OpConstant %float 1
 %length_c158da = OpFunction %void None %9
          %12 = OpLabel
-        %res = OpVariable %_ptr_Function_half Function %19
-         %13 = OpExtInst %half %15 Length %half_0x1p_0
-               OpStore %res %13
+        %res = OpVariable %_ptr_Function_half Function %14
+               OpStore %res %14
                OpReturn
                OpFunctionEnd
-%vertex_main_inner = OpFunction %v4float None %20
-         %22 = OpLabel
-         %23 = OpFunctionCall %void %length_c158da
+%vertex_main_inner = OpFunction %v4float None %17
+         %19 = OpLabel
+         %20 = OpFunctionCall %void %length_c158da
                OpReturnValue %5
                OpFunctionEnd
 %vertex_main = OpFunction %void None %9
-         %25 = OpLabel
-         %26 = OpFunctionCall %v4float %vertex_main_inner
-               OpStore %value %26
+         %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 %length_c158da
+               OpReturn
+               OpFunctionEnd
+%compute_main = OpFunction %void None %9
          %29 = OpLabel
          %30 = OpFunctionCall %void %length_c158da
                OpReturn
                OpFunctionEnd
-%compute_main = OpFunction %void None %9
-         %32 = OpLabel
-         %33 = OpFunctionCall %void %length_c158da
-               OpReturn
-               OpFunctionEnd

test/tint/builtins/gen/literal/length/c158da.wgsl.expected.wgsl

@@ -1,7 +1,7 @@
 enable f16;
 
 fn length_c158da() {
-  var res : f16 = length(1.0h);
+  var res : f16 = length(0.0h);
 }
 
 @vertex

test/tint/builtins/gen/literal/length/c2c544.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 length(vec<4, fa>) -> fa
+fn length_c2c544() {
+  var res = length(vec4(0.));
+}
+
+@vertex
+fn vertex_main() -> @builtin(position) vec4<f32> {
+  length_c2c544();
+  return vec4<f32>();
+}
+
+@fragment
+fn fragment_main() {
+  length_c2c544();
+}
+
+@compute @workgroup_size(1)
+fn compute_main() {
+  length_c2c544();
+}

test/tint/builtins/gen/literal/length/c2c544.wgsl.expected.dxc.hlsl

@@ -0,0 +1,30 @@
+void length_c2c544() {
+  float res = 0.0f;
+}
+
+struct tint_symbol {
+  float4 value : SV_Position;
+};
+
+float4 vertex_main_inner() {
+  length_c2c544();
+  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() {
+  length_c2c544();
+  return;
+}
+
+[numthreads(1, 1, 1)]
+void compute_main() {
+  length_c2c544();
+  return;
+}

test/tint/builtins/gen/literal/length/c2c544.wgsl.expected.fxc.hlsl

@@ -0,0 +1,30 @@
+void length_c2c544() {
+  float res = 0.0f;
+}
+
+struct tint_symbol {
+  float4 value : SV_Position;
+};
+
+float4 vertex_main_inner() {
+  length_c2c544();
+  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() {
+  length_c2c544();
+  return;
+}
+
+[numthreads(1, 1, 1)]
+void compute_main() {
+  length_c2c544();
+  return;
+}

test/tint/builtins/gen/literal/length/c2c544.wgsl.expected.glsl

@@ -0,0 +1,49 @@
+#version 310 es
+
+void length_c2c544() {
+  float res = 0.0f;
+}
+
+vec4 vertex_main() {
+  length_c2c544();
+  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 length_c2c544() {
+  float res = 0.0f;
+}
+
+void fragment_main() {
+  length_c2c544();
+}
+
+void main() {
+  fragment_main();
+  return;
+}
+#version 310 es
+
+void length_c2c544() {
+  float res = 0.0f;
+}
+
+void compute_main() {
+  length_c2c544();
+}
+
+layout(local_size_x = 1, local_size_y = 1, local_size_z = 1) in;
+void main() {
+  compute_main();
+  return;
+}

test/tint/builtins/gen/literal/length/c2c544.wgsl.expected.msl

@@ -0,0 +1,33 @@
+#include <metal_stdlib>
+
+using namespace metal;
+void length_c2c544() {
+  float res = 0.0f;
+}
+
+struct tint_symbol {
+  float4 value [[position]];
+};
+
+float4 vertex_main_inner() {
+  length_c2c544();
+  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() {
+  length_c2c544();
+  return;
+}
+
+kernel void compute_main() {
+  length_c2c544();
+  return;
+}
+

test/tint/builtins/gen/literal/length/c2c544.wgsl.expected.spvasm

@@ -0,0 +1,63 @@
+; SPIR-V
+; Version: 1.3
+; Generator: Google Tint Compiler; 0
+; Bound: 29
+; 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 %length_c2c544 "length_c2c544"
+               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
+%_ptr_Function_float = OpTypePointer Function %float
+         %15 = OpTypeFunction %v4float
+    %float_1 = OpConstant %float 1
+%length_c2c544 = OpFunction %void None %9
+         %12 = OpLabel
+        %res = OpVariable %_ptr_Function_float Function %8
+               OpStore %res %8
+               OpReturn
+               OpFunctionEnd
+%vertex_main_inner = OpFunction %v4float None %15
+         %17 = OpLabel
+         %18 = OpFunctionCall %void %length_c2c544
+               OpReturnValue %5
+               OpFunctionEnd
+%vertex_main = OpFunction %void None %9
+         %20 = OpLabel
+         %21 = OpFunctionCall %v4float %vertex_main_inner
+               OpStore %value %21
+               OpStore %vertex_point_size %float_1
+               OpReturn
+               OpFunctionEnd
+%fragment_main = OpFunction %void None %9
+         %24 = OpLabel
+         %25 = OpFunctionCall %void %length_c2c544
+               OpReturn
+               OpFunctionEnd
+%compute_main = OpFunction %void None %9
+         %27 = OpLabel
+         %28 = OpFunctionCall %void %length_c2c544
+               OpReturn
+               OpFunctionEnd

test/tint/builtins/gen/literal/length/c2c544.wgsl.expected.wgsl

@@ -0,0 +1,19 @@
+fn length_c2c544() {
+  var res = length(vec4(0.0));
+}
+
+@vertex
+fn vertex_main() -> @builtin(position) vec4<f32> {
+  length_c2c544();
+  return vec4<f32>();
+}
+
+@fragment
+fn fragment_main() {
+  length_c2c544();
+}
+
+@compute @workgroup_size(1)
+fn compute_main() {
+  length_c2c544();
+}

test/tint/builtins/gen/var/length/056071.wgsl

@@ -23,7 +23,7 @@
 
 // fn length(vec<3, f32>) -> f32
 fn length_056071() {
-  var arg_0 = vec3<f32>(1.f);
+  var arg_0 = vec3<f32>(0.f);
   var res: f32 = length(arg_0);
 }
 

test/tint/builtins/gen/var/length/056071.wgsl.expected.dxc.hlsl

@@ -1,5 +1,5 @@
 void length_056071() {
-  float3 arg_0 = (1.0f).xxx;
+  float3 arg_0 = (0.0f).xxx;
   float res = length(arg_0);
 }
 

test/tint/builtins/gen/var/length/056071.wgsl.expected.fxc.hlsl

@@ -1,5 +1,5 @@
 void length_056071() {
-  float3 arg_0 = (1.0f).xxx;
+  float3 arg_0 = (0.0f).xxx;
   float res = length(arg_0);
 }
 

test/tint/builtins/gen/var/length/056071.wgsl.expected.glsl

@@ -1,7 +1,7 @@
 #version 310 es
 
 void length_056071() {
-  vec3 arg_0 = vec3(1.0f);
+  vec3 arg_0 = vec3(0.0f);
   float res = length(arg_0);
 }
 
@@ -22,7 +22,7 @@ void main() {
 precision mediump float;
 
 void length_056071() {
-  vec3 arg_0 = vec3(1.0f);
+  vec3 arg_0 = vec3(0.0f);
   float res = length(arg_0);
 }
 
@@ -37,7 +37,7 @@ void main() {
 #version 310 es
 
 void length_056071() {
-  vec3 arg_0 = vec3(1.0f);
+  vec3 arg_0 = vec3(0.0f);
   float res = length(arg_0);
 }
 

test/tint/builtins/gen/var/length/056071.wgsl.expected.msl

@@ -2,7 +2,7 @@
 
 using namespace metal;
 void length_056071() {
-  float3 arg_0 = float3(1.0f);
+  float3 arg_0 = float3(0.0f);
   float res = length(arg_0);
 }
 

test/tint/builtins/gen/var/length/056071.wgsl.expected.spvasm

@@ -1,10 +1,10 @@
 ; SPIR-V
 ; Version: 1.3
 ; Generator: Google Tint Compiler; 0
-; Bound: 37
+; Bound: 36
 ; Schema: 0
                OpCapability Shader
-         %20 = OpExtInstImport "GLSL.std.450"
+         %18 = OpExtInstImport "GLSL.std.450"
                OpMemoryModel Logical GLSL450
                OpEntryPoint Vertex %vertex_main "vertex_main" %value %vertex_point_size
                OpEntryPoint Fragment %fragment_main "fragment_main"
@@ -33,41 +33,40 @@
        %void = OpTypeVoid
           %9 = OpTypeFunction %void
     %v3float = OpTypeVector %float 3
-    %float_1 = OpConstant %float 1
-         %15 = OpConstantComposite %v3float %float_1 %float_1 %float_1
+         %14 = OpConstantNull %v3float
 %_ptr_Function_v3float = OpTypePointer Function %v3float
-         %18 = OpConstantNull %v3float
 %_ptr_Function_float = OpTypePointer Function %float
-         %24 = OpTypeFunction %v4float
+         %22 = OpTypeFunction %v4float
+    %float_1 = OpConstant %float 1
 %length_056071 = OpFunction %void None %9
          %12 = OpLabel
-      %arg_0 = OpVariable %_ptr_Function_v3float Function %18
+      %arg_0 = OpVariable %_ptr_Function_v3float Function %14
         %res = OpVariable %_ptr_Function_float Function %8
-               OpStore %arg_0 %15
-         %21 = OpLoad %v3float %arg_0
-         %19 = OpExtInst %float %20 Length %21
-               OpStore %res %19
+               OpStore %arg_0 %14
+         %19 = OpLoad %v3float %arg_0
+         %17 = OpExtInst %float %18 Length %19
+               OpStore %res %17
                OpReturn
                OpFunctionEnd
-%vertex_main_inner = OpFunction %v4float None %24
-         %26 = OpLabel
-         %27 = OpFunctionCall %void %length_056071
+%vertex_main_inner = OpFunction %v4float None %22
+         %24 = OpLabel
+         %25 = OpFunctionCall %void %length_056071
                OpReturnValue %5
                OpFunctionEnd
 %vertex_main = OpFunction %void None %9
-         %29 = OpLabel
-         %30 = OpFunctionCall %v4float %vertex_main_inner
-               OpStore %value %30
+         %27 = OpLabel
+         %28 = OpFunctionCall %v4float %vertex_main_inner
+               OpStore %value %28
                OpStore %vertex_point_size %float_1
                OpReturn
                OpFunctionEnd
 %fragment_main = OpFunction %void None %9
-         %32 = OpLabel
-         %33 = OpFunctionCall %void %length_056071
+         %31 = OpLabel
+         %32 = OpFunctionCall %void %length_056071
                OpReturn
                OpFunctionEnd
 %compute_main = OpFunction %void None %9
-         %35 = OpLabel
-         %36 = OpFunctionCall %void %length_056071
+         %34 = OpLabel
+         %35 = OpFunctionCall %void %length_056071
                OpReturn
                OpFunctionEnd

test/tint/builtins/gen/var/length/056071.wgsl.expected.wgsl

@@ -1,5 +1,5 @@
 fn length_056071() {
-  var arg_0 = vec3<f32>(1.0f);
+  var arg_0 = vec3<f32>(0.0f);
   var res : f32 = length(arg_0);
 }
 

test/tint/builtins/gen/var/length/3f0e13.wgsl

@@ -25,7 +25,7 @@ enable f16;
 
 // fn length(vec<2, f16>) -> f16
 fn length_3f0e13() {
-  var arg_0 = vec2<f16>(1.h);
+  var arg_0 = vec2<f16>(0.h);
   var res: f16 = length(arg_0);
 }
 

test/tint/builtins/gen/var/length/3f0e13.wgsl.expected.dxc.hlsl

@@ -1,5 +1,5 @@
 void length_3f0e13() {
-  vector<float16_t, 2> arg_0 = (float16_t(1.0h)).xx;
+  vector<float16_t, 2> arg_0 = (float16_t(0.0h)).xx;
   float16_t res = length(arg_0);
 }
 

test/tint/builtins/gen/var/length/3f0e13.wgsl.expected.glsl

@@ -2,7 +2,7 @@
 #extension GL_AMD_gpu_shader_half_float : require
 
 void length_3f0e13() {
-  f16vec2 arg_0 = f16vec2(1.0hf);
+  f16vec2 arg_0 = f16vec2(0.0hf);
   float16_t res = length(arg_0);
 }
 
@@ -24,7 +24,7 @@ void main() {
 precision mediump float;
 
 void length_3f0e13() {
-  f16vec2 arg_0 = f16vec2(1.0hf);
+  f16vec2 arg_0 = f16vec2(0.0hf);
   float16_t res = length(arg_0);
 }
 
@@ -40,7 +40,7 @@ void main() {
 #extension GL_AMD_gpu_shader_half_float : require
 
 void length_3f0e13() {
-  f16vec2 arg_0 = f16vec2(1.0hf);
+  f16vec2 arg_0 = f16vec2(0.0hf);
   float16_t res = length(arg_0);
 }
 

test/tint/builtins/gen/var/length/3f0e13.wgsl.expected.msl

@@ -2,7 +2,7 @@
 
 using namespace metal;
 void length_3f0e13() {
-  half2 arg_0 = half2(1.0h);
+  half2 arg_0 = half2(0.0h);
   half res = length(arg_0);
 }
 

test/tint/builtins/gen/var/length/3f0e13.wgsl.expected.spvasm

@@ -1,14 +1,14 @@
 ; SPIR-V
 ; Version: 1.3
 ; Generator: Google Tint Compiler; 0
-; Bound: 40
+; Bound: 38
 ; Schema: 0
                OpCapability Shader
                OpCapability Float16
                OpCapability UniformAndStorageBuffer16BitAccess
                OpCapability StorageBuffer16BitAccess
                OpCapability StorageInputOutput16
-         %21 = OpExtInstImport "GLSL.std.450"
+         %19 = OpExtInstImport "GLSL.std.450"
                OpMemoryModel Logical GLSL450
                OpEntryPoint Vertex %vertex_main "vertex_main" %value %vertex_point_size
                OpEntryPoint Fragment %fragment_main "fragment_main"
@@ -38,43 +38,41 @@
           %9 = OpTypeFunction %void
        %half = OpTypeFloat 16
      %v2half = OpTypeVector %half 2
-%half_0x1p_0 = OpConstant %half 0x1p+0
-         %16 = OpConstantComposite %v2half %half_0x1p_0 %half_0x1p_0
+         %15 = OpConstantNull %v2half
 %_ptr_Function_v2half = OpTypePointer Function %v2half
-         %19 = OpConstantNull %v2half
 %_ptr_Function_half = OpTypePointer Function %half
-         %25 = OpConstantNull %half
-         %26 = OpTypeFunction %v4float
+         %23 = OpConstantNull %half
+         %24 = OpTypeFunction %v4float
     %float_1 = OpConstant %float 1
 %length_3f0e13 = OpFunction %void None %9
          %12 = OpLabel
-      %arg_0 = OpVariable %_ptr_Function_v2half Function %19
-        %res = OpVariable %_ptr_Function_half Function %25
-               OpStore %arg_0 %16
-         %22 = OpLoad %v2half %arg_0
-         %20 = OpExtInst %half %21 Length %22
-               OpStore %res %20
+      %arg_0 = OpVariable %_ptr_Function_v2half Function %15
+        %res = OpVariable %_ptr_Function_half Function %23
+               OpStore %arg_0 %15
+         %20 = OpLoad %v2half %arg_0
+         %18 = OpExtInst %half %19 Length %20
+               OpStore %res %18
                OpReturn
                OpFunctionEnd
-%vertex_main_inner = OpFunction %v4float None %26
-         %28 = OpLabel
-         %29 = OpFunctionCall %void %length_3f0e13
+%vertex_main_inner = OpFunction %v4float None %24
+         %26 = OpLabel
+         %27 = OpFunctionCall %void %length_3f0e13
                OpReturnValue %5
                OpFunctionEnd
 %vertex_main = OpFunction %void None %9
-         %31 = OpLabel
-         %32 = OpFunctionCall %v4float %vertex_main_inner
-               OpStore %value %32
+         %29 = OpLabel
+         %30 = OpFunctionCall %v4float %vertex_main_inner
+               OpStore %value %30
                OpStore %vertex_point_size %float_1
                OpReturn
                OpFunctionEnd
 %fragment_main = OpFunction %void None %9
-         %35 = OpLabel
-         %36 = OpFunctionCall %void %length_3f0e13
+         %33 = OpLabel
+         %34 = OpFunctionCall %void %length_3f0e13
                OpReturn
                OpFunctionEnd
 %compute_main = OpFunction %void None %9
-         %38 = OpLabel
-         %39 = OpFunctionCall %void %length_3f0e13
+         %36 = OpLabel
+         %37 = OpFunctionCall %void %length_3f0e13
                OpReturn
                OpFunctionEnd

test/tint/builtins/gen/var/length/3f0e13.wgsl.expected.wgsl

@@ -1,7 +1,7 @@
 enable f16;
 
 fn length_3f0e13() {
-  var arg_0 = vec2<f16>(1.0h);
+  var arg_0 = vec2<f16>(0.0h);
   var res : f16 = length(arg_0);
 }
 

test/tint/builtins/gen/var/length/555aba.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 length(vec<3, fa>) -> fa
+fn length_555aba() {
+  const arg_0 = vec3(0.);
+  var res = length(arg_0);
+}
+
+@vertex
+fn vertex_main() -> @builtin(position) vec4<f32> {
+  length_555aba();
+  return vec4<f32>();
+}
+
+@fragment
+fn fragment_main() {
+  length_555aba();
+}
+
+@compute @workgroup_size(1)
+fn compute_main() {
+  length_555aba();
+}

test/tint/builtins/gen/var/length/555aba.wgsl.expected.dxc.hlsl

@@ -0,0 +1,30 @@
+void length_555aba() {
+  float res = 0.0f;
+}
+
+struct tint_symbol {
+  float4 value : SV_Position;
+};
+
+float4 vertex_main_inner() {
+  length_555aba();
+  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() {
+  length_555aba();
+  return;
+}
+
+[numthreads(1, 1, 1)]
+void compute_main() {
+  length_555aba();
+  return;
+}

test/tint/builtins/gen/var/length/555aba.wgsl.expected.fxc.hlsl

@@ -0,0 +1,30 @@
+void length_555aba() {
+  float res = 0.0f;
+}
+
+struct tint_symbol {
+  float4 value : SV_Position;
+};
+
+float4 vertex_main_inner() {
+  length_555aba();
+  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() {
+  length_555aba();
+  return;
+}
+
+[numthreads(1, 1, 1)]
+void compute_main() {
+  length_555aba();
+  return;
+}

test/tint/builtins/gen/var/length/555aba.wgsl.expected.glsl

@@ -0,0 +1,49 @@
+#version 310 es
+
+void length_555aba() {
+  float res = 0.0f;
+}
+
+vec4 vertex_main() {
+  length_555aba();
+  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 length_555aba() {
+  float res = 0.0f;
+}
+
+void fragment_main() {
+  length_555aba();
+}
+
+void main() {
+  fragment_main();
+  return;
+}
+#version 310 es
+
+void length_555aba() {
+  float res = 0.0f;
+}
+
+void compute_main() {
+  length_555aba();
+}
+
+layout(local_size_x = 1, local_size_y = 1, local_size_z = 1) in;
+void main() {
+  compute_main();
+  return;
+}

test/tint/builtins/gen/var/length/555aba.wgsl.expected.msl

@@ -0,0 +1,33 @@
+#include <metal_stdlib>
+
+using namespace metal;
+void length_555aba() {
+  float res = 0.0f;
+}
+
+struct tint_symbol {
+  float4 value [[position]];
+};
+
+float4 vertex_main_inner() {
+  length_555aba();
+  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() {
+  length_555aba();
+  return;
+}
+
+kernel void compute_main() {
+  length_555aba();
+  return;
+}
+

test/tint/builtins/gen/var/length/555aba.wgsl.expected.spvasm

@@ -0,0 +1,63 @@
+; SPIR-V
+; Version: 1.3
+; Generator: Google Tint Compiler; 0
+; Bound: 29
+; 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 %length_555aba "length_555aba"
+               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
+%_ptr_Function_float = OpTypePointer Function %float
+         %15 = OpTypeFunction %v4float
+    %float_1 = OpConstant %float 1
+%length_555aba = OpFunction %void None %9
+         %12 = OpLabel
+        %res = OpVariable %_ptr_Function_float Function %8
+               OpStore %res %8
+               OpReturn
+               OpFunctionEnd
+%vertex_main_inner = OpFunction %v4float None %15
+         %17 = OpLabel
+         %18 = OpFunctionCall %void %length_555aba
+               OpReturnValue %5
+               OpFunctionEnd
+%vertex_main = OpFunction %void None %9
+         %20 = OpLabel
+         %21 = OpFunctionCall %v4float %vertex_main_inner
+               OpStore %value %21
+               OpStore %vertex_point_size %float_1
+               OpReturn
+               OpFunctionEnd
+%fragment_main = OpFunction %void None %9
+         %24 = OpLabel
+         %25 = OpFunctionCall %void %length_555aba
+               OpReturn
+               OpFunctionEnd
+%compute_main = OpFunction %void None %9
+         %27 = OpLabel
+         %28 = OpFunctionCall %void %length_555aba
+               OpReturn
+               OpFunctionEnd

test/tint/builtins/gen/var/length/555aba.wgsl.expected.wgsl

@@ -0,0 +1,20 @@
+fn length_555aba() {
+  const arg_0 = vec3(0.0);
+  var res = length(arg_0);
+}
+
+@vertex
+fn vertex_main() -> @builtin(position) vec4<f32> {
+  length_555aba();
+  return vec4<f32>();
+}
+
+@fragment
+fn fragment_main() {
+  length_555aba();
+}
+
+@compute @workgroup_size(1)
+fn compute_main() {
+  length_555aba();
+}