[Bug middle-end/114449] bswap64 not optimized

[pali at kernel dot org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114449

--- Comment #3 from Pali Rohár <pali at kernel dot org> ---
Note that clang optimizes it just with -O2 and does not require any special
pragma.