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skia2/tests/sksl/shared/CommaSideEffects.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 "colorRed"
OpMemberName %_UniformBuffer 1 "colorGreen"
OpMemberName %_UniformBuffer 2 "colorWhite"
OpMemberName %_UniformBuffer 3 "colorBlack"
OpName %_entrypoint_v "_entrypoint_v"
OpName %setToColorBlack_vh4 "setToColorBlack_vh4"
OpName %main "main"
OpName %a "a"
OpName %b "b"
OpName %c "c"
OpName %d "d"
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 %11 Binding 0
OpDecorate %11 DescriptorSet 0
OpDecorate %32 RelaxedPrecision
OpDecorate %a RelaxedPrecision
OpDecorate %b RelaxedPrecision
OpDecorate %c RelaxedPrecision
OpDecorate %d RelaxedPrecision
OpDecorate %42 RelaxedPrecision
OpDecorate %45 RelaxedPrecision
OpDecorate %46 RelaxedPrecision
OpDecorate %48 RelaxedPrecision
OpDecorate %51 RelaxedPrecision
OpDecorate %52 RelaxedPrecision
OpDecorate %53 RelaxedPrecision
OpDecorate %54 RelaxedPrecision
OpDecorate %55 RelaxedPrecision
OpDecorate %58 RelaxedPrecision
OpDecorate %65 RelaxedPrecision
OpDecorate %72 RelaxedPrecision
OpDecorate %79 RelaxedPrecision
OpDecorate %88 RelaxedPrecision
OpDecorate %90 RelaxedPrecision
OpDecorate %91 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
%11 = OpVariable %_ptr_Uniform__UniformBuffer Uniform
%void = OpTypeVoid
%16 = OpTypeFunction %void
%float_0 = OpConstant %float 0
%v2float = OpTypeVector %float 2
%20 = OpConstantComposite %v2float %float_0 %float_0
%_ptr_Function_v2float = OpTypePointer Function %v2float
%_ptr_Function_v4float = OpTypePointer Function %v4float
%25 = OpTypeFunction %void %_ptr_Function_v4float
%_ptr_Uniform_v4float = OpTypePointer Uniform %v4float
%int = OpTypeInt 32 1
%int_3 = OpConstant %int 3
%33 = OpTypeFunction %v4float %_ptr_Function_v2float
%int_0 = OpConstant %int 0
%int_1 = OpConstant %int 1
%int_2 = OpConstant %int 2
%false = OpConstantFalse %bool
%v4bool = OpTypeVector %bool 4
%_entrypoint_v = OpFunction %void None %16
%17 = OpLabel
%21 = OpVariable %_ptr_Function_v2float Function
OpStore %21 %20
%23 = OpFunctionCall %v4float %main %21
OpStore %sk_FragColor %23
OpReturn
OpFunctionEnd
%setToColorBlack_vh4 = OpFunction %void None %25
%26 = OpFunctionParameter %_ptr_Function_v4float
%27 = OpLabel
%28 = OpAccessChain %_ptr_Uniform_v4float %11 %int_3
%32 = OpLoad %v4float %28
OpStore %26 %32
OpReturn
OpFunctionEnd
%main = OpFunction %v4float None %33
%34 = OpFunctionParameter %_ptr_Function_v2float
%35 = OpLabel
%a = OpVariable %_ptr_Function_v4float Function
%b = OpVariable %_ptr_Function_v4float Function
%c = OpVariable %_ptr_Function_v4float Function
%d = OpVariable %_ptr_Function_v4float Function
%46 = OpVariable %_ptr_Function_v4float Function
%83 = OpVariable %_ptr_Function_v4float Function
%40 = OpAccessChain %_ptr_Uniform_v4float %11 %int_0
%42 = OpLoad %v4float %40
OpStore %b %42
%43 = OpAccessChain %_ptr_Uniform_v4float %11 %int_1
%45 = OpLoad %v4float %43
OpStore %c %45
%47 = OpFunctionCall %void %setToColorBlack_vh4 %46
%48 = OpLoad %v4float %46
OpStore %d %48
%49 = OpAccessChain %_ptr_Uniform_v4float %11 %int_2
%51 = OpLoad %v4float %49
OpStore %a %51
%52 = OpFMul %v4float %51 %51
OpStore %a %52
%53 = OpFMul %v4float %42 %42
OpStore %b %53
%54 = OpFMul %v4float %45 %45
OpStore %c %54
%55 = OpFMul %v4float %48 %48
OpStore %d %55
%57 = OpAccessChain %_ptr_Uniform_v4float %11 %int_2
%58 = OpLoad %v4float %57
%59 = OpFOrdEqual %v4bool %52 %58
%61 = OpAll %bool %59
OpSelectionMerge %63 None
OpBranchConditional %61 %62 %63
%62 = OpLabel
%64 = OpAccessChain %_ptr_Uniform_v4float %11 %int_0
%65 = OpLoad %v4float %64
%66 = OpFOrdEqual %v4bool %53 %65
%67 = OpAll %bool %66
OpBranch %63
%63 = OpLabel
%68 = OpPhi %bool %false %35 %67 %62
OpSelectionMerge %70 None
OpBranchConditional %68 %69 %70
%69 = OpLabel
%71 = OpAccessChain %_ptr_Uniform_v4float %11 %int_1
%72 = OpLoad %v4float %71
%73 = OpFOrdEqual %v4bool %54 %72
%74 = OpAll %bool %73
OpBranch %70
%70 = OpLabel
%75 = OpPhi %bool %false %63 %74 %69
OpSelectionMerge %77 None
OpBranchConditional %75 %76 %77
%76 = OpLabel
%78 = OpAccessChain %_ptr_Uniform_v4float %11 %int_3
%79 = OpLoad %v4float %78
%80 = OpFOrdEqual %v4bool %55 %79
%81 = OpAll %bool %80
OpBranch %77
%77 = OpLabel
%82 = OpPhi %bool %false %70 %81 %76
OpSelectionMerge %86 None
OpBranchConditional %82 %84 %85
%84 = OpLabel
%87 = OpAccessChain %_ptr_Uniform_v4float %11 %int_1
%88 = OpLoad %v4float %87
OpStore %83 %88
OpBranch %86
%85 = OpLabel
%89 = OpAccessChain %_ptr_Uniform_v4float %11 %int_0
%90 = OpLoad %v4float %89
OpStore %83 %90
OpBranch %86
%86 = OpLabel
%91 = OpLoad %v4float %83
OpReturnValue %91
OpFunctionEnd
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