[Bug target/113543] Poor codegen for bit-counting functions (countl_zero, countl_one, countr_zero, countr_one)

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113543

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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          Component|c++                         |target

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
>Clang does not emit the extra xor instruction. I don't really know why. 

This is a performance errata in some Intel cores and GCC implements that while
LLVM/clang does NOT. See PR 62011 on that.