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>
34 lines
1.1 KiB
JavaScript
34 lines
1.1 KiB
JavaScript
OpCapability Shader
|
|
%1 = OpExtInstImport "GLSL.std.450"
|
|
OpMemoryModel Logical GLSL450
|
|
OpEntryPoint Fragment %main "main" %sk_FragColor %sk_Clockwise
|
|
OpExecutionMode %main OriginUpperLeft
|
|
OpName %sk_FragColor "sk_FragColor"
|
|
OpName %sk_Clockwise "sk_Clockwise"
|
|
OpName %main "main"
|
|
OpName %x "x"
|
|
OpDecorate %sk_FragColor RelaxedPrecision
|
|
OpDecorate %sk_FragColor Location 0
|
|
OpDecorate %sk_FragColor Index 0
|
|
OpDecorate %sk_Clockwise BuiltIn FrontFacing
|
|
%float = OpTypeFloat 32
|
|
%v4float = OpTypeVector %float 4
|
|
%_ptr_Output_v4float = OpTypePointer Output %v4float
|
|
%sk_FragColor = OpVariable %_ptr_Output_v4float Output
|
|
%bool = OpTypeBool
|
|
%_ptr_Input_bool = OpTypePointer Input %bool
|
|
%sk_Clockwise = OpVariable %_ptr_Input_bool Input
|
|
%void = OpTypeVoid
|
|
%11 = OpTypeFunction %void
|
|
%_ptr_Function_float = OpTypePointer Function %float
|
|
%float_0 = OpConstant %float 0
|
|
%16 = OpConstantComposite %v4float %float_0 %float_0 %float_0 %float_0
|
|
%main = OpFunction %void None %11
|
|
%12 = OpLabel
|
|
%x = OpVariable %_ptr_Function_float Function
|
|
OpStore %x %float_0
|
|
OpStore %x %float_0
|
|
OpStore %sk_FragColor %16
|
|
OpReturn
|
|
OpFunctionEnd
|