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>
74 lines
2.5 KiB
JavaScript
74 lines
2.5 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 %_UniformBuffer "_UniformBuffer"
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OpMemberName %_UniformBuffer 0 "unknownInput"
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OpName %_entrypoint_v "_entrypoint_v"
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OpName %main "main"
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OpName %r "r"
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OpName %g "g"
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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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OpMemberDecorate %_UniformBuffer 0 RelaxedPrecision
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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 %r RelaxedPrecision
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OpDecorate %g RelaxedPrecision
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OpDecorate %34 RelaxedPrecision
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OpDecorate %35 RelaxedPrecision
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OpDecorate %37 RelaxedPrecision
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OpDecorate %38 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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%15 = OpTypeFunction %void
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%float_0 = OpConstant %float 0
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%v2float = OpTypeVector %float 2
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%19 = OpConstantComposite %v2float %float_0 %float_0
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%_ptr_Function_v2float = OpTypePointer Function %v2float
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%23 = OpTypeFunction %v4float %_ptr_Function_v2float
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%_ptr_Function_float = OpTypePointer Function %float
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%float_1 = OpConstant %float 1
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%_ptr_Uniform_float = OpTypePointer Uniform %float
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%int = OpTypeInt 32 1
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%int_0 = OpConstant %int 0
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%_entrypoint_v = OpFunction %void None %15
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%16 = OpLabel
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%20 = OpVariable %_ptr_Function_v2float Function
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OpStore %20 %19
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%22 = OpFunctionCall %v4float %main %20
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OpStore %sk_FragColor %22
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OpReturn
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OpFunctionEnd
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%main = OpFunction %v4float None %23
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%24 = OpFunctionParameter %_ptr_Function_v2float
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%25 = OpLabel
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%r = OpVariable %_ptr_Function_float Function
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%g = OpVariable %_ptr_Function_float Function
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%30 = OpAccessChain %_ptr_Uniform_float %10 %int_0
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%34 = OpLoad %float %30
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%35 = OpFSub %float %float_1 %34
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OpStore %r %35
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%36 = OpAccessChain %_ptr_Uniform_float %10 %int_0
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%37 = OpLoad %float %36
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OpStore %g %37
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%38 = OpCompositeConstruct %v4float %35 %37 %float_0 %float_1
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OpReturnValue %38
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OpFunctionEnd
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