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>
65 lines
2.0 KiB
JavaScript
65 lines
2.0 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 %main "main" %sk_FragColor %sk_Clockwise
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OpExecutionMode %main OriginUpperLeft
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OpName %sk_FragColor "sk_FragColor"
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OpName %sk_Clockwise "sk_Clockwise"
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OpName %_UniformBuffer "_UniformBuffer"
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OpMemberName %_UniformBuffer 0 "unknownInput"
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OpName %main "main"
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OpName %value "value"
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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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OpMemberDecorate %_UniformBuffer 0 Offset 0
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OpDecorate %_UniformBuffer Block
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OpDecorate %10 Binding 0
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OpDecorate %10 DescriptorSet 0
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OpDecorate %value 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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%_UniformBuffer = OpTypeStruct %float
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%_ptr_Uniform__UniformBuffer = OpTypePointer Uniform %_UniformBuffer
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%10 = OpVariable %_ptr_Uniform__UniformBuffer Uniform
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%void = OpTypeVoid
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%14 = OpTypeFunction %void
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%_ptr_Function_float = OpTypePointer Function %float
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%float_0 = OpConstant %float 0
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%int = OpTypeInt 32 1
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%int_0 = OpConstant %int 0
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%_ptr_Uniform_float = OpTypePointer Uniform %float
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%float_2 = OpConstant %float 2
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%31 = OpConstantComposite %v4float %float_0 %float_0 %float_0 %float_0
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%float_1 = OpConstant %float 1
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%main = OpFunction %void None %14
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%15 = OpLabel
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%value = OpVariable %_ptr_Function_float Function
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OpStore %value %float_0
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OpSelectionMerge %21 None
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OpSwitch %int_0 %21 0 %22 1 %23
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%22 = OpLabel
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OpStore %value %float_0
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%24 = OpAccessChain %_ptr_Uniform_float %10 %int_0
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%26 = OpLoad %float %24
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%28 = OpFOrdEqual %bool %26 %float_2
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OpSelectionMerge %30 None
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OpBranchConditional %28 %29 %30
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%29 = OpLabel
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OpStore %sk_FragColor %31
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OpBranch %21
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%30 = OpLabel
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OpBranch %23
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%23 = OpLabel
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OpStore %value %float_1
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OpBranch %21
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%21 = OpLabel
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OpReturn
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OpFunctionEnd
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