https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85950
--- Comment #5 from Uroš Bizjak <ubizjak at gmail dot com> --- (In reply to Allan Jensen from comment #4) > Btw, I found this while trying to figure out why std::round() wasn't also > optimized to a single roundss instruction, is that just a missing > optimization or is there a quirk about that that makes them not fit? > > I noticed the definition of the ROUND enum in i386.md is even missing the > entry to for normal rounding (0 AFAIK) round() rounds half away from zero, while roundss/roundsd (using normal rounding) rounds half to even.
