external/vulkancts/data/vulkan/amber/graphicsfuzz/cov-bitfieldreverse-loop-limit-underflow.amber

#!amber

# Copyright 2021 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 coverage-gap found by the GraphicsFuzz project.

# Short description: A fragment shader that covers specific NIR code paths

# The test passes because the shader always writes red.

# Optimized using spirv-opt with the following arguments:
# '-O'
# spirv-opt commit hash: a0370efd589be33d5d9a85cfde2f85841b3755af



SHADER vertex variant_vertex_shader PASSTHROUGH

# variant_fragment_shader is derived from the following GLSL:
# #version 320 es
# #define _int_1 _GLF_uniform_int_values[0]
# #define _int_0 _GLF_uniform_int_values[1]
# #define _int_6 _GLF_uniform_int_values[2]
# #define _int_5 _GLF_uniform_int_values[3]
#
# precision highp float;
# precision highp int;
#
# // Contents of _GLF_uniform_int_values: [1, 0, 6, 5]
# layout(set = 0, binding = 0) uniform buf0
# {
#     int _GLF_uniform_int_values[4];
# };
#
# layout(location = 0) out vec4 _GLF_color;
#
# void main()
# {
#     // a becomes 0x8000000 which is the smallest possible negative integer.
#     int a = min(1, bitfieldReverse(1));
#     int b = _int_5;
#
#     // a - 1 underflowa to the largest positive integer. The loop is executed
#     // once because of the break inside.
#     for (int i = 1; i <= a - 1; i++)
#     {
#         b += i;
#
#         // Always true.
#         if (_int_1 == 1)
#         {
#             break;
#         }
#     }
#
#     // Always true.
#     if (b == _int_6)
#     {
#         _GLF_color = vec4(_int_1, _int_0, _int_0, _int_1);
#     }
#     else
#     {
#         _GLF_color = vec4(_int_0);
#     }
# }
SHADER fragment variant_fragment_shader SPIRV-ASM TARGET_ENV spv1.0
; SPIR-V
; Version: 1.0
; Generator: Khronos Glslang Reference Front End; 10
; Bound: 78
; Schema: 0
               OpCapability Shader
          %1 = OpExtInstImport "GLSL.std.450"
               OpMemoryModel Logical GLSL450
               OpEntryPoint Fragment %4 "main" %56
               OpExecutionMode %4 OriginUpperLeft
               OpSource ESSL 320
               OpName %4 "main"
               OpName %16 "buf0"
               OpMemberName %16 0 "_GLF_uniform_int_values"
               OpName %18 ""
               OpName %56 "_GLF_color"
               OpDecorate %15 ArrayStride 16
               OpMemberDecorate %16 0 Offset 0
               OpDecorate %16 Block
               OpDecorate %18 DescriptorSet 0
               OpDecorate %18 Binding 0
               OpDecorate %56 Location 0
          %2 = OpTypeVoid
          %3 = OpTypeFunction %2
          %6 = OpTypeInt 32 1
          %9 = OpConstant %6 1
         %13 = OpTypeInt 32 0
         %14 = OpConstant %13 4
         %15 = OpTypeArray %6 %14
         %16 = OpTypeStruct %15
         %17 = OpTypePointer Uniform %16
         %18 = OpVariable %17 Uniform
         %19 = OpConstant %6 0
         %20 = OpConstant %6 3
         %21 = OpTypePointer Uniform %6
         %33 = OpTypeBool
         %47 = OpConstant %6 2
         %53 = OpTypeFloat 32
         %54 = OpTypeVector %53 4
         %55 = OpTypePointer Output %54
         %56 = OpVariable %55 Output
          %4 = OpFunction %2 None %3
          %5 = OpLabel
         %10 = OpBitReverse %6 %9
         %11 = OpExtInst %6 %1 SMin %9 %10
         %22 = OpAccessChain %21 %18 %19 %20
         %23 = OpLoad %6 %22
               OpBranch %25
         %25 = OpLabel
         %76 = OpPhi %6 %23 %5 %37 %28
         %75 = OpPhi %6 %9 %5 %45 %28
         %32 = OpISub %6 %11 %9
         %34 = OpSLessThanEqual %33 %75 %32
               OpLoopMerge %27 %28 None
               OpBranchConditional %34 %26 %27
         %26 = OpLabel
         %37 = OpIAdd %6 %76 %75
         %38 = OpAccessChain %21 %18 %19 %19
         %39 = OpLoad %6 %38
         %40 = OpIEqual %33 %39 %9
               OpSelectionMerge %42 None
               OpBranchConditional %40 %41 %42
         %41 = OpLabel
               OpBranch %27
         %42 = OpLabel
               OpBranch %28
         %28 = OpLabel
         %45 = OpIAdd %6 %75 %9
               OpBranch %25
         %27 = OpLabel
         %77 = OpPhi %6 %76 %25 %37 %41
         %48 = OpAccessChain %21 %18 %19 %47
         %49 = OpLoad %6 %48
         %50 = OpIEqual %33 %77 %49
               OpSelectionMerge %52 None
               OpBranchConditional %50 %51 %70
         %51 = OpLabel
         %57 = OpAccessChain %21 %18 %19 %19
         %58 = OpLoad %6 %57
         %59 = OpConvertSToF %53 %58
         %60 = OpAccessChain %21 %18 %19 %9
         %61 = OpLoad %6 %60
         %62 = OpConvertSToF %53 %61
         %69 = OpCompositeConstruct %54 %59 %62 %62 %59
               OpStore %56 %69
               OpBranch %52
         %70 = OpLabel
         %71 = OpAccessChain %21 %18 %19 %9
         %72 = OpLoad %6 %71
         %73 = OpConvertSToF %53 %72
         %74 = OpCompositeConstruct %54 %73 %73 %73 %73
               OpStore %56 %74
               OpBranch %52
         %52 = OpLabel
               OpReturn
               OpFunctionEnd
END

# uniforms for variant

# _GLF_uniform_int_values
BUFFER variant__GLF_uniform_int_values DATA_TYPE int32[] STD140 DATA
 1 0 6 5
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__GLF_uniform_int_values 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