On 2025-06-26 17:55:43 [+0200], Kristoffer Haugsbakk wrote: > On Thu, Jun 12, 2025, at 00:14, Sebastian Andrzej Siewior wrote: > > On x86 the bswap32/64 macro is implemenated based on the x86 opcode wich > > s/implemenated/implemented/ > > s/wich/which/ > > > performs the required shifting in just one opcode. > > The other CPUs fallback to the generic shifting as implemented by > > default_swab32() and default_bswap64() if needed. > > > > I've been looking at how good a compiler is at recognizing the default > > shift and emitting an optimized operation: > > - x86, arm64 msvc v19.20 > > default_swab32() optimized > > default_bswap64() shifts > > _byteswap_uint64() otimized > > > > - x86, arm64 msvc v19.37 > > default_swab32() optimized > > default_bswap64() optimized > > _byteswap_uint64() otimized > > Is it supposed to say `otimized` twice? Nope. Fixed. Thank you. Sebastian
