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ConstProp: Mul x,#powof2 -> Lshl x,clz(#powof2)

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Stefanos Kornilios Mitsis Poiitidis committed 2020-12-03 19:06:14 +02:00
1 parent d481bd4ffc
commit 46fb0503f0
1 file changed
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External/FEXCore/Source/Interface/IR/Passes/ConstProp.cpp
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@@ -374,6 +374,13 @@ bool ConstProp::Run(IREmitter *IREmit) {
IREmit->ReplaceWithConstant(CodeNode, NewConstant);
Changed = true;
continue;
} else if (IREmit->IsValueConstant(Op->Header.Args[1], &Constant2) && __builtin_popcountl(Constant2) == 1) {
if (IROp->Size == 4 || IROp->Size == 8) {
uint64_t amt = __builtin_ctzl(Constant2);
IREmit->SetWriteCursor(CodeNode);
auto shift = IREmit->_Lshl(CurrentIR.GetNode(Op->Header.Args[0]), IREmit->_Constant(amt));
IREmit->ReplaceAllUsesWith(CodeNode, shift);
}
}
break;
}