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PUTARG_STK/x86: mark push [mem] candidates reg optional #68641

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merged 1 commit into from
May 9, 2022
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PUTARG_STK/x86: mark push [mem] candidates reg optional #68641

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14 changes: 10 additions & 4 deletions src/coreclr/jit/lowerxarch.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -647,11 +647,17 @@ void Lowering::LowerPutArgStk(GenTreePutArgStk* putArgStk)
MakeSrcContained(putArgStk, src);
}
#ifdef TARGET_X86
else if ((genTypeSize(src) == TARGET_POINTER_SIZE) && IsContainableMemoryOp(src) &&
IsSafeToContainMem(putArgStk, src))
else if ((genTypeSize(src) == TARGET_POINTER_SIZE) && IsSafeToContainMem(putArgStk, src))
{
// Contain for "push [mem]".
MakeSrcContained(putArgStk, src);
// We can use "src" directly from memory with "push [mem]".
if (IsContainableMemoryOp(src))
{
MakeSrcContained(putArgStk, src);
}
else
{
src->SetRegOptional();
}
}
#endif // TARGET_X86
}
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