Hi! On 12/11/20 2:07 AM, David Gibson wrote: > Right, alignment issues have been a perennial problem. We find some > platform that has alignment constraints that break, fix that, then > someone finds the alignment fixups cause horrible performance > problems, repeat ad nauseum. >From my discussions with GCC developers I have learnt that it shouldn't be a problem to use memcpy() in such cases to avoid aliasing problems resulting in unaligned access. GCC will just optimize memcpy() in cases where an unaligned access is faster. > There's been another round of this pretty recently, which is probably > the cause of the fixup. I just hope the re-optimizations that Tom > Rini has in his pipeline don't break things again for you. The GCC compile farm has two fast SPARC servers [1] running Debian unstable, so I suggest testing such changes there before merging them. Adrian > [1] https://gcc.gnu.org/wiki/CompileFarm -- .''`. John Paul Adrian Glaubitz : :' : Debian Developer - glaubitz@xxxxxxxxxx `. `' Freie Universitaet Berlin - glaubitz@xxxxxxxxxxxxxxxxxxx `- GPG: 62FF 8A75 84E0 2956 9546 0006 7426 3B37 F5B5 F913
