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>
55 lines
1.7 KiB
JavaScript
55 lines
1.7 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 %main "main"
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OpName %x "x"
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OpName %y "y"
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OpName %z "z"
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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 %20 RelaxedPrecision
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OpDecorate %21 RelaxedPrecision
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OpDecorate %22 RelaxedPrecision
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OpDecorate %24 RelaxedPrecision
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OpDecorate %25 RelaxedPrecision
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OpDecorate %26 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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%11 = OpTypeFunction %void
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%int = OpTypeInt 32 1
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%_ptr_Function_int = OpTypePointer Function %int
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%int_0 = OpConstant %int 0
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%int_1 = OpConstant %int 1
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%v3float = OpTypeVector %float 3
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%main = OpFunction %void None %11
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%12 = OpLabel
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%x = OpVariable %_ptr_Function_int Function
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%y = OpVariable %_ptr_Function_int Function
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%z = OpVariable %_ptr_Function_int Function
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OpStore %x %int_0
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OpStore %y %int_0
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OpStore %z %int_0
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OpStore %x %int_1
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OpStore %z %int_1
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%20 = OpConvertSToF %float %int_1
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%21 = OpConvertSToF %float %int_0
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%22 = OpConvertSToF %float %int_1
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%24 = OpCompositeConstruct %v3float %20 %21 %22
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%25 = OpLoad %v4float %sk_FragColor
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%26 = OpVectorShuffle %v4float %25 %24 4 5 6 3
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OpStore %sk_FragColor %26
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OpReturn
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OpFunctionEnd
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