https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110832
--- Comment #7 from Uroš Bizjak <ubizjak at gmail dot com> --- (In reply to Richard Biener from comment #6) > Do we know whether we could in theory improve the sanitizing by optimization > without -funsafe-math-optimizations (I think -fno-trapping-math, > -ffinite-math-only -fno-signalling-nans should be a better guard?)? I was looking at -funsafe-math-optimizations because the compiler links in crtfastmath.c which sets DAZ and FTZ flags, so eventual denormals won't bother us. -fu-m-o also enables -fno-trapping-math, which assumes masked FP exceptions, so we can still allow V2SF infinities and NaNs. FYI, clang enables this optimization by default, since it defaults to -fno-trapping-math. It seems to me that they don't care about denormals.
