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skia2/tests/sksl/intrinsics/All.asm.frag
John Stiles ffc9dec755 Eliminate redundant loads following stores. 
We now have two functions `writeOpLoad` and `writeOpStore` which are
in charge of writing SpvOpLoad and SpvOpStore instructions.
`writeOpStore` also keeps track of pointer stores in a "store cache."
Subsequent loads from that same pointer will be found in the cache and
will return the value stored in that pointer instead.

Such a cache definitely cannot work in the face of control flow, so we
make the following concessions:
- `pruneReachableOps` is now `pruneConditionalOps`. Any pointers that
  are altered inside a potentially-unreachable block are cleared from
  the cache entirely.
- The entire store cache is cleared at all OpLabels within a loop.

The cache also cannot work in the presence of swizzled stores, so we
make another significant concession:
- The entire store cache is cleared whenever we store into a non-memory
  pointer (e.g., assigning into a swizzled LValue, such as `foo.xz`).

Despite these significant limitations, this manages to dramatically
shrink many real-world examples.

Change-Id: I0981a0cf7b45b064e153e9ada271494c8e00cad5
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/530054
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
2022-04-18 14:57:48 +00:00

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OpCapability Shader
%1 = OpExtInstImport "GLSL.std.450"
OpMemoryModel Logical GLSL450
OpEntryPoint Fragment %_entrypoint_v "_entrypoint" %sk_FragColor %sk_Clockwise
OpExecutionMode %_entrypoint_v OriginUpperLeft
OpName %sk_FragColor "sk_FragColor"
OpName %sk_Clockwise "sk_Clockwise"
OpName %_UniformBuffer "_UniformBuffer"
OpMemberName %_UniformBuffer 0 "inputH4"
OpMemberName %_UniformBuffer 1 "expectedH4"
OpMemberName %_UniformBuffer 2 "colorGreen"
OpMemberName %_UniformBuffer 3 "colorRed"
OpName %_entrypoint_v "_entrypoint_v"
OpName %main "main"
OpName %inputVal "inputVal"
OpName %expected "expected"
OpDecorate %sk_FragColor RelaxedPrecision
OpDecorate %sk_FragColor Location 0
OpDecorate %sk_FragColor Index 0
OpDecorate %sk_Clockwise BuiltIn FrontFacing
OpMemberDecorate %_UniformBuffer 0 Offset 0
OpMemberDecorate %_UniformBuffer 0 RelaxedPrecision
OpMemberDecorate %_UniformBuffer 1 Offset 16
OpMemberDecorate %_UniformBuffer 1 RelaxedPrecision
OpMemberDecorate %_UniformBuffer 2 Offset 32
OpMemberDecorate %_UniformBuffer 2 RelaxedPrecision
OpMemberDecorate %_UniformBuffer 3 Offset 48
OpMemberDecorate %_UniformBuffer 3 RelaxedPrecision
OpDecorate %_UniformBuffer Block
OpDecorate %10 Binding 0
OpDecorate %10 DescriptorSet 0
OpDecorate %33 RelaxedPrecision
OpDecorate %34 RelaxedPrecision
OpDecorate %36 RelaxedPrecision
OpDecorate %38 RelaxedPrecision
OpDecorate %40 RelaxedPrecision
OpDecorate %46 RelaxedPrecision
OpDecorate %47 RelaxedPrecision
OpDecorate %49 RelaxedPrecision
OpDecorate %51 RelaxedPrecision
OpDecorate %53 RelaxedPrecision
OpDecorate %96 RelaxedPrecision
OpDecorate %99 RelaxedPrecision
OpDecorate %100 RelaxedPrecision
%float = OpTypeFloat 32
%v4float = OpTypeVector %float 4
%_ptr_Output_v4float = OpTypePointer Output %v4float
%sk_FragColor = OpVariable %_ptr_Output_v4float Output
%bool = OpTypeBool
%_ptr_Input_bool = OpTypePointer Input %bool
%sk_Clockwise = OpVariable %_ptr_Input_bool Input
%_UniformBuffer = OpTypeStruct %v4float %v4float %v4float %v4float
%_ptr_Uniform__UniformBuffer = OpTypePointer Uniform %_UniformBuffer
%10 = OpVariable %_ptr_Uniform__UniformBuffer Uniform
%void = OpTypeVoid
%15 = OpTypeFunction %void
%float_0 = OpConstant %float 0
%v2float = OpTypeVector %float 2
%19 = OpConstantComposite %v2float %float_0 %float_0
%_ptr_Function_v2float = OpTypePointer Function %v2float
%23 = OpTypeFunction %v4float %_ptr_Function_v2float
%v4bool = OpTypeVector %bool 4
%_ptr_Function_v4bool = OpTypePointer Function %v4bool
%_ptr_Uniform_v4float = OpTypePointer Uniform %v4float
%int = OpTypeInt 32 1
%int_0 = OpConstant %int 0
%int_1 = OpConstant %int 1
%false = OpConstantFalse %bool
%v2bool = OpTypeVector %bool 2
%v3bool = OpTypeVector %bool 3
%_ptr_Function_v4float = OpTypePointer Function %v4float
%int_2 = OpConstant %int 2
%int_3 = OpConstant %int 3
%_entrypoint_v = OpFunction %void None %15
%16 = OpLabel
%20 = OpVariable %_ptr_Function_v2float Function
OpStore %20 %19
%22 = OpFunctionCall %v4float %main %20
OpStore %sk_FragColor %22
OpReturn
OpFunctionEnd
%main = OpFunction %v4float None %23
%24 = OpFunctionParameter %_ptr_Function_v2float
%25 = OpLabel
%inputVal = OpVariable %_ptr_Function_v4bool Function
%expected = OpVariable %_ptr_Function_v4bool Function
%89 = OpVariable %_ptr_Function_v4float Function
%29 = OpAccessChain %_ptr_Uniform_v4float %10 %int_0
%33 = OpLoad %v4float %29
%34 = OpCompositeExtract %float %33 0
%35 = OpFUnordNotEqual %bool %34 %float_0
%36 = OpCompositeExtract %float %33 1
%37 = OpFUnordNotEqual %bool %36 %float_0
%38 = OpCompositeExtract %float %33 2
%39 = OpFUnordNotEqual %bool %38 %float_0
%40 = OpCompositeExtract %float %33 3
%41 = OpFUnordNotEqual %bool %40 %float_0
%42 = OpCompositeConstruct %v4bool %35 %37 %39 %41
OpStore %inputVal %42
%44 = OpAccessChain %_ptr_Uniform_v4float %10 %int_1
%46 = OpLoad %v4float %44
%47 = OpCompositeExtract %float %46 0
%48 = OpFUnordNotEqual %bool %47 %float_0
%49 = OpCompositeExtract %float %46 1
%50 = OpFUnordNotEqual %bool %49 %float_0
%51 = OpCompositeExtract %float %46 2
%52 = OpFUnordNotEqual %bool %51 %float_0
%53 = OpCompositeExtract %float %46 3
%54 = OpFUnordNotEqual %bool %53 %float_0
%55 = OpCompositeConstruct %v4bool %48 %50 %52 %54
OpStore %expected %55
%58 = OpVectorShuffle %v2bool %42 %42 0 1
%57 = OpAll %bool %58
%60 = OpCompositeExtract %bool %55 0
%61 = OpLogicalEqual %bool %57 %60
OpSelectionMerge %63 None
OpBranchConditional %61 %62 %63
%62 = OpLabel
%65 = OpVectorShuffle %v3bool %42 %42 0 1 2
%64 = OpAll %bool %65
%67 = OpCompositeExtract %bool %55 1
%68 = OpLogicalEqual %bool %64 %67
OpBranch %63
%63 = OpLabel
%69 = OpPhi %bool %false %25 %68 %62
OpSelectionMerge %71 None
OpBranchConditional %69 %70 %71
%70 = OpLabel
%72 = OpAll %bool %42
%73 = OpCompositeExtract %bool %55 2
%74 = OpLogicalEqual %bool %72 %73
OpBranch %71
%71 = OpLabel
%75 = OpPhi %bool %false %63 %74 %70
OpSelectionMerge %77 None
OpBranchConditional %75 %76 %77
%76 = OpLabel
OpBranch %77
%77 = OpLabel
%78 = OpPhi %bool %false %71 %60 %76
OpSelectionMerge %80 None
OpBranchConditional %78 %79 %80
%79 = OpLabel
%81 = OpCompositeExtract %bool %55 1
%82 = OpLogicalEqual %bool %false %81
OpBranch %80
%80 = OpLabel
%83 = OpPhi %bool %false %77 %82 %79
OpSelectionMerge %85 None
OpBranchConditional %83 %84 %85
%84 = OpLabel
%86 = OpCompositeExtract %bool %55 2
%87 = OpLogicalEqual %bool %false %86
OpBranch %85
%85 = OpLabel
%88 = OpPhi %bool %false %80 %87 %84
OpSelectionMerge %93 None
OpBranchConditional %88 %91 %92
%91 = OpLabel
%94 = OpAccessChain %_ptr_Uniform_v4float %10 %int_2
%96 = OpLoad %v4float %94
OpStore %89 %96
OpBranch %93
%92 = OpLabel
%97 = OpAccessChain %_ptr_Uniform_v4float %10 %int_3
%99 = OpLoad %v4float %97
OpStore %89 %99
OpBranch %93
%93 = OpLabel
%100 = OpLoad %v4float %89
OpReturnValue %100
OpFunctionEnd
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