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>
75 lines
2.6 KiB
JavaScript
75 lines
2.6 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 %rgb "rgb"
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OpName %a "a"
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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 %rgb RelaxedPrecision
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OpDecorate %_arr_float_int_3 ArrayStride 16
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OpDecorate %a RelaxedPrecision
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OpDecorate %38 RelaxedPrecision
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OpDecorate %40 RelaxedPrecision
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OpDecorate %42 RelaxedPrecision
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OpDecorate %43 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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%int = OpTypeInt 32 1
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%int_3 = OpConstant %int 3
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%_arr_float_int_3 = OpTypeArray %float %int_3
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%_ptr_Function__arr_float_int_3 = OpTypePointer Function %_arr_float_int_3
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%_ptr_Function_float = OpTypePointer Function %float
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%int_0 = OpConstant %int 0
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%float_1 = OpConstant %float 1
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%int_1 = OpConstant %int 1
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%int_2 = OpConstant %int 2
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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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%rgb = OpVariable %_ptr_Function__arr_float_int_3 Function
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%a = OpVariable %_ptr_Function_float Function
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%31 = OpAccessChain %_ptr_Function_float %rgb %int_0
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OpStore %31 %float_0
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%34 = OpAccessChain %_ptr_Function_float %rgb %int_1
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OpStore %34 %float_1
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%36 = OpAccessChain %_ptr_Function_float %rgb %int_2
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OpStore %36 %float_0
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OpStore %a %float_1
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%37 = OpAccessChain %_ptr_Function_float %rgb %int_0
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%38 = OpLoad %float %37
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%39 = OpAccessChain %_ptr_Function_float %rgb %int_1
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%40 = OpLoad %float %39
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%41 = OpAccessChain %_ptr_Function_float %rgb %int_2
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%42 = OpLoad %float %41
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%43 = OpCompositeConstruct %v4float %38 %40 %42 %float_1
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OpReturnValue %43
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OpFunctionEnd
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