Found in #63285, the following pattern:
int Foo(int x) => x & (x - 1);
has this codegen on x86/64:
lea eax, [rdx-1]
and eax, edx
Expected codegen:
Should be pretty straightforward to implement in lowerxarch.cpp by replacing AND(X, SUB(X, 1) with HWINTRINSIC ResetLowestSetBit (X), leaving it here for anyone who is interested in contributing to RyuJIT.
Found in #63285, the following pattern:
has this codegen on x86/64:
Expected codegen:
Should be pretty straightforward to implement in lowerxarch.cpp by replacing
AND(X, SUB(X, 1)withHWINTRINSIC ResetLowestSetBit (X), leaving it here for anyone who is interested in contributing to RyuJIT.