--- /dev/null
+#!amber
+
+# Copyright 2019 Google LLC
+#
+# 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.
+
+
+# A test for a bug found by GraphicsFuzz.
+
+# Short description: A fragment shader with two loops that write to a struct
+
+# The test passes because the shader always writes the color red.
+
+# Optimized using spirv-opt with the following arguments:
+# '--private-to-local'
+# '--private-to-local'
+# '--eliminate-dead-inserts'
+# '--if-conversion'
+# '--eliminate-dead-code-aggressive'
+# '--eliminate-dead-code-aggressive'
+# '--vector-dce'
+# '--convert-local-access-chains'
+# '--convert-local-access-chains'
+# '--eliminate-local-single-block'
+# '--eliminate-dead-code-aggressive'
+# '--redundancy-elimination'
+# '--eliminate-local-multi-store'
+# '--eliminate-dead-branches'
+# '--merge-blocks'
+# '--eliminate-dead-code-aggressive'
+# '--eliminate-dead-branches'
+# '--eliminate-dead-inserts'
+# '--simplify-instructions'
+# '--eliminate-local-multi-store'
+# '--private-to-local'
+# '--combine-access-chains'
+# '--eliminate-local-single-store'
+# '--eliminate-dead-branches'
+# '--merge-return'
+# spirv-opt commit hash: 06407250a169c6a03b3765e86619075af1a8c187
+
+
+
+SHADER vertex variant_vertex_shader PASSTHROUGH
+
+# variant_fragment_shader is derived from the following GLSL:
+# #version 310 es
+# precision highp float;
+#
+# struct StructType
+# {
+# vec3 col;
+# bvec4 bbbb;
+# };
+#
+# layout(location = 0) out vec4 _GLF_color;
+#
+# layout(set = 0, binding = 0) uniform buf0
+# {
+# vec2 injectionSwitch;
+# };
+# void main()
+# {
+# StructType s;
+#
+# for (
+# int i = 0;
+# i < int(injectionSwitch.y); // i < 1
+# i++)
+# {
+# s.col = vec3(1.0, 0.0, 0.0);
+# }
+#
+# for (
+# int i = 0;
+# i < int(injectionSwitch.y); // i < 1
+# i++)
+# {
+# s.col = vec3(1.0, 0.0, 0.0);;
+# }
+# _GLF_color = vec4(s.col, 1.0);
+# }
+SHADER fragment variant_fragment_shader SPIRV-ASM
+; SPIR-V
+; Version: 1.0
+; Generator: Khronos Glslang Reference Front End; 7
+; Bound: 75
+; Schema: 0
+ OpCapability Shader
+ %1 = OpExtInstImport "GLSL.std.450"
+ OpMemoryModel Logical GLSL450
+ OpEntryPoint Fragment %4 "main" %58
+ OpExecutionMode %4 OriginUpperLeft
+ OpSource ESSL 310
+ OpName %4 "main"
+ OpName %18 "buf0"
+ OpMemberName %18 0 "injectionSwitch"
+ OpName %20 ""
+ OpName %31 "StructType"
+ OpMemberName %31 0 "col"
+ OpMemberName %31 1 "bbbb"
+ OpName %58 "_GLF_color"
+ OpMemberDecorate %18 0 Offset 0
+ OpDecorate %18 Block
+ OpDecorate %20 DescriptorSet 0
+ OpDecorate %20 Binding 0
+ OpDecorate %41 RelaxedPrecision
+ OpDecorate %55 RelaxedPrecision
+ OpDecorate %58 Location 0
+ OpDecorate %70 RelaxedPrecision
+ OpDecorate %71 RelaxedPrecision
+ %2 = OpTypeVoid
+ %3 = OpTypeFunction %2
+ %6 = OpTypeInt 32 1
+ %9 = OpConstant %6 0
+ %16 = OpTypeFloat 32
+ %17 = OpTypeVector %16 2
+ %18 = OpTypeStruct %17
+ %19 = OpTypePointer Uniform %18
+ %20 = OpVariable %19 Uniform
+ %21 = OpTypeInt 32 0
+ %22 = OpConstant %21 1
+ %23 = OpTypePointer Uniform %16
+ %27 = OpTypeBool
+ %29 = OpTypeVector %16 3
+ %30 = OpTypeVector %27 4
+ %31 = OpTypeStruct %29 %30
+ %34 = OpConstant %16 1
+ %35 = OpConstant %16 0
+ %36 = OpConstantComposite %29 %34 %35 %35
+ %40 = OpConstant %6 1
+ %56 = OpTypeVector %16 4
+ %57 = OpTypePointer Output %56
+ %58 = OpVariable %57 Output
+ %74 = OpUndef %31
+ %4 = OpFunction %2 None %3
+ %5 = OpLabel
+ OpBranch %10
+ %10 = OpLabel
+ %73 = OpPhi %31 %74 %5 %66 %11
+ %70 = OpPhi %6 %9 %5 %41 %11
+ %24 = OpAccessChain %23 %20 %9 %22
+ %25 = OpLoad %16 %24
+ %26 = OpConvertFToS %6 %25
+ %28 = OpSLessThan %27 %70 %26
+ OpLoopMerge %12 %11 None
+ OpBranchConditional %28 %11 %12
+ %11 = OpLabel
+ %66 = OpCompositeInsert %31 %36 %73 0
+ %41 = OpIAdd %6 %70 %40
+ OpBranch %10
+ %12 = OpLabel
+ OpBranch %43
+ %43 = OpLabel
+ %72 = OpPhi %31 %73 %12 %68 %44
+ %71 = OpPhi %6 %9 %12 %55 %44
+ %52 = OpSLessThan %27 %71 %26
+ OpLoopMerge %45 %44 None
+ OpBranchConditional %52 %44 %45
+ %44 = OpLabel
+ %68 = OpCompositeInsert %31 %36 %72 0
+ %55 = OpIAdd %6 %71 %40
+ OpBranch %43
+ %45 = OpLabel
+ %60 = OpCompositeExtract %29 %72 0
+ %61 = OpCompositeExtract %16 %60 0
+ %62 = OpCompositeExtract %16 %60 1
+ %63 = OpCompositeExtract %16 %60 2
+ %64 = OpCompositeConstruct %56 %61 %62 %63 %34
+ OpStore %58 %64
+ OpReturn
+ OpFunctionEnd
+END
+
+# uniforms for variant
+
+# injectionSwitch
+BUFFER variant_injectionSwitch DATA_TYPE vec2<float> DATA
+ 0.0 1.0
+END
+
+BUFFER variant_framebuffer FORMAT B8G8R8A8_UNORM
+
+PIPELINE graphics variant_pipeline
+ ATTACH variant_vertex_shader
+ ATTACH variant_fragment_shader
+ FRAMEBUFFER_SIZE 256 256
+ BIND BUFFER variant_framebuffer AS color LOCATION 0
+ BIND BUFFER variant_injectionSwitch AS uniform DESCRIPTOR_SET 0 BINDING 0
+END
+CLEAR_COLOR variant_pipeline 0 0 0 255
+
+CLEAR variant_pipeline
+RUN variant_pipeline DRAW_RECT POS 0 0 SIZE 256 256
+
+EXPECT variant_framebuffer IDX 0 0 SIZE 256 256 EQ_RGBA 255 0 0 255