On Wed, Mar 11, 2015 at 3:13 PM, Ilia Mirkin <imir...@alum.mit.edu> wrote: > On Wed, Mar 11, 2015 at 6:09 PM, Matt Turner <matts...@gmail.com> wrote: >> glibc uses roundsd/roundss in rint/f guarded by a runtime check. The >> SSE code here just allows those instructions to be inlined. > > OK, as long as glibc would end up using the same rounding mode settings, > > Reviewed-by: Ilia Mirkin <imir...@alum.mit.edu>
Okay, so slight difference. It doesn't use the same rounding mode settings, since rint() rounds in the current rounding direction it uses rounds* with imm8=0x4 (current rounding direction) whereas we're using rounds* with imm8=0x8 (round to nearest). We're assuming the current rounding mode is to nearest, since that's the default and if it weren't other things would go badly. I don't know if your R-b stands in that case? _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/mesa-dev
