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>
92 lines
3.1 KiB
JavaScript
92 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 %_UniformBuffer "_UniformBuffer"
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OpMemberName %_UniformBuffer 0 "colorGreen"
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OpName %_entrypoint_v "_entrypoint_v"
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OpName %main "main"
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OpName %u1 "u1"
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OpName %u2 "u2"
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OpName %u3 "u3"
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OpName %u4 "u4"
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OpName %u5 "u5"
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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 %u5 RelaxedPrecision
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OpDecorate %43 RelaxedPrecision
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OpDecorate %48 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 %v4float
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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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%uint = OpTypeInt 32 0
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%_ptr_Function_uint = OpTypePointer Function %uint
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%uint_0 = OpConstant %uint 0
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%uint_1 = OpConstant %uint 1
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%uint_305441741 = OpConstant %uint 305441741
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%uint_2147483646 = OpConstant %uint 2147483646
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%uint_4294967294 = OpConstant %uint 4294967294
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%uint_65534 = OpConstant %uint 65534
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%_ptr_Uniform_v4float = OpTypePointer Uniform %v4float
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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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%u1 = OpVariable %_ptr_Function_uint Function
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%u2 = OpVariable %_ptr_Function_uint Function
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%u3 = OpVariable %_ptr_Function_uint Function
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%u4 = OpVariable %_ptr_Function_uint Function
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%u5 = OpVariable %_ptr_Function_uint Function
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OpStore %u1 %uint_0
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%31 = OpIAdd %uint %uint_0 %uint_1
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OpStore %u1 %31
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OpStore %u2 %uint_305441741
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%34 = OpIAdd %uint %uint_305441741 %uint_1
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OpStore %u2 %34
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OpStore %u3 %uint_2147483646
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%37 = OpIAdd %uint %uint_2147483646 %uint_1
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OpStore %u3 %37
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OpStore %u4 %uint_4294967294
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%40 = OpIAdd %uint %uint_4294967294 %uint_1
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OpStore %u4 %40
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OpStore %u5 %uint_65534
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%43 = OpIAdd %uint %uint_65534 %uint_1
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OpStore %u5 %43
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%44 = OpAccessChain %_ptr_Uniform_v4float %10 %int_0
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%48 = OpLoad %v4float %44
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OpReturnValue %48
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OpFunctionEnd
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