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RedundantFlagCalculationElimination: optimize rmif

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Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
This commit is contained in:
Alyssa Rosenzweig committed 2024-02-06 13:06:26 -04:00
1 parent 4bd28c0ed8
commit 308d9a751c
1 file changed
+14 -7
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FEXCore/Source/Interface/IR/Passes/RedundantFlagCalculationElimination.cpp
+14 -7
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@@ -156,13 +156,6 @@ DeadFlagCalculationEliminination::Classify(IROp_Header *IROp)
case OP_LOADNZCV:
return {.Read = FLAG_NZCV};
case OP_RMIFNZCV: // TODO: Optimize?
return {
.Read = FLAG_NZCV,
.Write = FLAG_NZCV,
.CanEliminate = true,
};
case OP_ADCNZCV:
case OP_SBBNZCV:
return {
@@ -193,6 +186,20 @@ DeadFlagCalculationEliminination::Classify(IROp_Header *IROp)
};
}
case OP_RMIFNZCV: {
auto Op = IROp->CW<IR::IROp_RmifNZCV>();
static_assert(FLAG_N == (1 << 3), "rmif mask lines up with our bits");
static_assert(FLAG_Z == (1 << 2), "rmif mask lines up with our bits");
static_assert(FLAG_C == (1 << 1), "rmif mask lines up with our bits");
static_assert(FLAG_V == (1 << 0), "rmif mask lines up with our bits");
return {
.Write = Op->Mask,
.CanEliminate = true,
};
}
case OP_INVALIDATEFLAGS: {
auto Op = IROp->CW<IR::IROp_InvalidateFlags>();
unsigned Flags = 0;