https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92712
--- Comment #25 from Marc Glisse <glisse at gcc dot gnu.org> --- (In reply to Feng Xue from comment #24) > Another point: if B+-C can be folded to an existing gimple value, we might > deduce B+-C does not overflow? We can deduce that loading this value that represents B+-C does not overflow at runtime (since we aren't computing anything, just copying some other value), but not that the operation B+-C would not overflow if it was actually evaluated. So it could help a bit sometimes. We still need to ensure that the multiplication by A does not overflow though.
