[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  changed:

   What|Removed |Added

 Resolution|--- |DUPLICATE
 Status|UNCONFIRMED |RESOLVED

--- Comment #2 from Andrew Pinski  ---
The rest are a dup of bug 110679.

*** This bug has been marked as a duplicate of bug 110679 ***

[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  changed:

   What|Removed |Added

  Component|c++ |target

--- Comment #1 from Andrew Pinski  ---
>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.