http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55734
--- Comment #21 from Teresa Johnson <tejohnson at google dot com> 2012-12-19 17:35:08 UTC --- On Wed, Dec 19, 2012 at 8:48 AM, jakub at gcc dot gnu.org <gcc-bugzi...@gcc.gnu.org> wrote: > > http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55734 > > --- Comment #18 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-12-19 > 16:48:00 UTC --- > Perhaps > if (v > 0) > { > #if IN_LIBGCOV > r = 63 - __builtin_clzll (v); > #else > if (sizeof (v) <= sizeof (HOST_WIDE_INT)) > r = floor_log2 (v); > else if (sizeof (v) == 2 * sizeof (HOST_WIDE_INT)) > { > r = v >> HOST_BITS_PER_WIDE_INT; > if (r) > r = floor_log2 (r) + HOST_BITS_PER_WIDE_INT; > else > r = floor_log2 (v); > } > else > gcc_unreachable (); > #endif > } Also, I have changed the runtime size checks into preprocessor checks, both to increase the speed and also to avoid compile-time errors about shifting by the size of the variable (on v >> HOST_BITS_PER_WIDE_INT). Thanks, Teresa > > -- > Configure bugmail: http://gcc.gnu.org/bugzilla/userprefs.cgi?tab=email > ------- You are receiving this mail because: ------- > You are on the CC list for the bug. -- Teresa Johnson | Software Engineer | tejohn...@google.com | 408-460-2413
