http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56866
--- Comment #14 from Jakub Jelinek <jakub at gcc dot gnu.org> 2013-04-26 09:00:42 UTC --- Created attachment 29944 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=29944 gcc49-pr56866.patch The fix for gcc.c-torture/execute/pr51581* and pr53645.c etc. is quite obvious, we obviously can't use xop_pmacsdqh with unsigned highpart odd multiplication, say for the pr51581-1.c unsigned division by 3U, which is high part multiplication by 0xaaaaaaabU, with the result shifted right by 1 at the end. If we compute say 3ULL * 0xaaaaaaabULL, we can't use xop_pmacsdqh which computes 3LL * 0xffffffffaaaaaaabLL instead. That said, there are no vpmacsdqh insns in the sha512 code for -O3 -march=bdver2, so it must be something else.
