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>
87 lines
3.1 KiB
JavaScript
87 lines
3.1 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 %m44 "m44"
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OpName %v4 "v4"
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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 %m44 RelaxedPrecision
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OpDecorate %v4 RelaxedPrecision
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OpDecorate %36 RelaxedPrecision
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OpDecorate %37 RelaxedPrecision
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OpDecorate %40 RelaxedPrecision
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OpDecorate %41 RelaxedPrecision
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OpDecorate %42 RelaxedPrecision
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OpDecorate %45 RelaxedPrecision
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OpDecorate %46 RelaxedPrecision
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OpDecorate %47 RelaxedPrecision
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OpDecorate %50 RelaxedPrecision
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OpDecorate %51 RelaxedPrecision
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OpDecorate %52 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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%15 = OpTypeFunction %v4float
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%mat4v4float = OpTypeMatrix %v4float 4
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%_ptr_Function_mat4v4float = OpTypePointer Function %mat4v4float
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%float_123 = OpConstant %float 123
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%float_0 = OpConstant %float 0
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%22 = OpConstantComposite %v4float %float_123 %float_0 %float_0 %float_0
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%23 = OpConstantComposite %v4float %float_0 %float_123 %float_0 %float_0
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%24 = OpConstantComposite %v4float %float_0 %float_0 %float_123 %float_0
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%25 = OpConstantComposite %v4float %float_0 %float_0 %float_0 %float_123
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%26 = OpConstantComposite %mat4v4float %22 %23 %24 %25
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%_ptr_Function_v4float = OpTypePointer Function %v4float
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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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%32 = OpConstantComposite %v4float %float_0 %float_1 %float_2 %float_3
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%int = OpTypeInt 32 1
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%int_0 = OpConstant %int 0
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%int_1 = OpConstant %int 1
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%int_2 = OpConstant %int 2
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%int_3 = OpConstant %int 3
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%_entrypoint_v = OpFunction %void None %12
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%13 = OpLabel
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%14 = OpFunctionCall %v4float %main
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OpStore %sk_FragColor %14
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OpReturn
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OpFunctionEnd
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%main = OpFunction %v4float None %15
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%16 = OpLabel
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%m44 = OpVariable %_ptr_Function_mat4v4float Function
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%v4 = OpVariable %_ptr_Function_v4float Function
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OpStore %m44 %26
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OpStore %v4 %32
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%35 = OpAccessChain %_ptr_Function_v4float %m44 %int_0
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%36 = OpLoad %v4float %35
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%37 = OpVectorTimesScalar %v4float %36 %float_0
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%39 = OpAccessChain %_ptr_Function_v4float %m44 %int_1
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%40 = OpLoad %v4float %39
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%41 = OpVectorTimesScalar %v4float %40 %float_1
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%42 = OpFAdd %v4float %37 %41
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%44 = OpAccessChain %_ptr_Function_v4float %m44 %int_2
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%45 = OpLoad %v4float %44
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%46 = OpVectorTimesScalar %v4float %45 %float_2
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%47 = OpFAdd %v4float %42 %46
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%49 = OpAccessChain %_ptr_Function_v4float %m44 %int_3
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%50 = OpLoad %v4float %49
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%51 = OpVectorTimesScalar %v4float %50 %float_3
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%52 = OpFAdd %v4float %47 %51
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OpReturnValue %52
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OpFunctionEnd
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