ffc9dec755
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>
60 lines
2.1 KiB
JavaScript
60 lines
2.1 KiB
JavaScript
OpCapability Shader
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%1 = OpExtInstImport "GLSL.std.450"
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OpMemoryModel Logical GLSL450
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OpEntryPoint Fragment %_entrypoint_v "_entrypoint" %sk_FragColor %sk_Clockwise
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OpExecutionMode %_entrypoint_v OriginUpperLeft
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OpName %sk_FragColor "sk_FragColor"
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OpName %sk_Clockwise "sk_Clockwise"
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OpName %_entrypoint_v "_entrypoint_v"
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OpName %main "main"
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OpName %x "x"
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OpName %y "y"
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OpDecorate %sk_FragColor RelaxedPrecision
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OpDecorate %sk_FragColor Location 0
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OpDecorate %sk_FragColor Index 0
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OpDecorate %sk_Clockwise BuiltIn FrontFacing
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OpDecorate %x RelaxedPrecision
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OpDecorate %34 RelaxedPrecision
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%float = OpTypeFloat 32
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%v4float = OpTypeVector %float 4
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%_ptr_Output_v4float = OpTypePointer Output %v4float
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%sk_FragColor = OpVariable %_ptr_Output_v4float Output
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%bool = OpTypeBool
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%_ptr_Input_bool = OpTypePointer Input %bool
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%sk_Clockwise = OpVariable %_ptr_Input_bool Input
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%void = OpTypeVoid
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%12 = OpTypeFunction %void
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%float_0 = OpConstant %float 0
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%v2float = OpTypeVector %float 2
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%16 = OpConstantComposite %v2float %float_0 %float_0
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%_ptr_Function_v2float = OpTypePointer Function %v2float
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%20 = OpTypeFunction %v4float %_ptr_Function_v2float
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%mat2v2float = OpTypeMatrix %v2float 2
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%_ptr_Function_mat2v2float = OpTypePointer Function %mat2v2float
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%float_1 = OpConstant %float 1
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%float_2 = OpConstant %float 2
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%float_3 = OpConstant %float 3
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%29 = OpConstantComposite %v2float %float_0 %float_1
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%30 = OpConstantComposite %v2float %float_2 %float_3
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%31 = OpConstantComposite %mat2v2float %29 %30
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%33 = OpConstantComposite %v4float %float_0 %float_1 %float_2 %float_3
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%_entrypoint_v = OpFunction %void None %12
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%13 = OpLabel
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%17 = OpVariable %_ptr_Function_v2float Function
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OpStore %17 %16
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%19 = OpFunctionCall %v4float %main %17
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OpStore %sk_FragColor %19
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OpReturn
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OpFunctionEnd
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%main = OpFunction %v4float None %20
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%21 = OpFunctionParameter %_ptr_Function_v2float
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%22 = OpLabel
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%x = OpVariable %_ptr_Function_mat2v2float Function
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%y = OpVariable %_ptr_Function_v2float Function
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OpStore %x %31
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%34 = OpVectorShuffle %v2float %33 %33 0 1
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OpStore %y %34
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%35 = OpVectorShuffle %v4float %34 %34 0 1 0 1
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OpReturnValue %35
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OpFunctionEnd
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