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skia2/tests/sksl/shared/ScalarConversionConstructorsES2.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 "colorGreen"
OpMemberName %_UniformBuffer 1 "colorRed"
OpName %_entrypoint_v "_entrypoint_v"
OpName %main "main"
OpName %f "f"
OpName %i "i"
OpName %b "b"
OpName %f1 "f1"
OpName %f2 "f2"
OpName %f3 "f3"
OpName %i1 "i1"
OpName %i2 "i2"
OpName %i3 "i3"
OpName %b1 "b1"
OpName %b2 "b2"
OpName %b3 "b3"
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
OpDecorate %_UniformBuffer Block
OpDecorate %10 Binding 0
OpDecorate %10 DescriptorSet 0
OpDecorate %32 RelaxedPrecision
OpDecorate %33 RelaxedPrecision
OpDecorate %37 RelaxedPrecision
OpDecorate %38 RelaxedPrecision
OpDecorate %43 RelaxedPrecision
OpDecorate %44 RelaxedPrecision
OpDecorate %63 RelaxedPrecision
OpDecorate %64 RelaxedPrecision
OpDecorate %65 RelaxedPrecision
OpDecorate %66 RelaxedPrecision
OpDecorate %67 RelaxedPrecision
OpDecorate %68 RelaxedPrecision
OpDecorate %69 RelaxedPrecision
OpDecorate %70 RelaxedPrecision
OpDecorate %71 RelaxedPrecision
OpDecorate %72 RelaxedPrecision
OpDecorate %73 RelaxedPrecision
OpDecorate %74 RelaxedPrecision
OpDecorate %75 RelaxedPrecision
OpDecorate %76 RelaxedPrecision
OpDecorate %85 RelaxedPrecision
OpDecorate %87 RelaxedPrecision
OpDecorate %88 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
%_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
%_ptr_Function_float = OpTypePointer Function %float
%_ptr_Uniform_v4float = OpTypePointer Uniform %v4float
%int = OpTypeInt 32 1
%int_0 = OpConstant %int 0
%_ptr_Function_int = OpTypePointer Function %int
%_ptr_Function_bool = OpTypePointer Function %bool
%float_1 = OpConstant %float 1
%int_1 = OpConstant %int 1
%float_9 = OpConstant %float 9
%_ptr_Function_v4float = OpTypePointer Function %v4float
%_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
%f = OpVariable %_ptr_Function_float Function
%i = OpVariable %_ptr_Function_int Function
%b = OpVariable %_ptr_Function_bool Function
%f1 = OpVariable %_ptr_Function_float Function
%f2 = OpVariable %_ptr_Function_float Function
%f3 = OpVariable %_ptr_Function_float Function
%i1 = OpVariable %_ptr_Function_int Function
%i2 = OpVariable %_ptr_Function_int Function
%i3 = OpVariable %_ptr_Function_int Function
%b1 = OpVariable %_ptr_Function_bool Function
%b2 = OpVariable %_ptr_Function_bool Function
%b3 = OpVariable %_ptr_Function_bool Function
%79 = OpVariable %_ptr_Function_v4float Function
%28 = OpAccessChain %_ptr_Uniform_v4float %10 %int_0
%32 = OpLoad %v4float %28
%33 = OpCompositeExtract %float %32 1
OpStore %f %33
%36 = OpAccessChain %_ptr_Uniform_v4float %10 %int_0
%37 = OpLoad %v4float %36
%38 = OpCompositeExtract %float %37 1
%39 = OpConvertFToS %int %38
OpStore %i %39
%42 = OpAccessChain %_ptr_Uniform_v4float %10 %int_0
%43 = OpLoad %v4float %42
%44 = OpCompositeExtract %float %43 1
%45 = OpFUnordNotEqual %bool %44 %float_0
OpStore %b %45
OpStore %f1 %33
%48 = OpConvertSToF %float %39
OpStore %f2 %48
%50 = OpSelect %float %45 %float_1 %float_0
OpStore %f3 %50
%53 = OpConvertFToS %int %33
OpStore %i1 %53
OpStore %i2 %39
%56 = OpSelect %int %45 %int_1 %int_0
OpStore %i3 %56
%59 = OpFUnordNotEqual %bool %33 %float_0
OpStore %b1 %59
%61 = OpINotEqual %bool %39 %int_0
OpStore %b2 %61
OpStore %b3 %45
%63 = OpFAdd %float %33 %48
%64 = OpFAdd %float %63 %50
%65 = OpConvertSToF %float %53
%66 = OpFAdd %float %64 %65
%67 = OpConvertSToF %float %39
%68 = OpFAdd %float %66 %67
%69 = OpConvertSToF %float %56
%70 = OpFAdd %float %68 %69
%71 = OpSelect %float %59 %float_1 %float_0
%72 = OpFAdd %float %70 %71
%73 = OpSelect %float %61 %float_1 %float_0
%74 = OpFAdd %float %72 %73
%75 = OpSelect %float %45 %float_1 %float_0
%76 = OpFAdd %float %74 %75
%78 = OpFOrdEqual %bool %76 %float_9
OpSelectionMerge %83 None
OpBranchConditional %78 %81 %82
%81 = OpLabel
%84 = OpAccessChain %_ptr_Uniform_v4float %10 %int_0
%85 = OpLoad %v4float %84
OpStore %79 %85
OpBranch %83
%82 = OpLabel
%86 = OpAccessChain %_ptr_Uniform_v4float %10 %int_1
%87 = OpLoad %v4float %86
OpStore %79 %87
OpBranch %83
%83 = OpLabel
%88 = OpLoad %v4float %79
OpReturnValue %88
OpFunctionEnd
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