https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111698
--- Comment #2 from Uroš Bizjak <ubizjak at gmail dot com> --- (In reply to Richard Biener from comment #1) > I guess we could do this even on GIMPLE and in general to aligned sub-word > accesses (where byte accesses are always aligned). > > It might be also a good fit for RTL forwprop or that mem-offset pass in > development. I don't think this optimization should be universally enabled. According to Agner Fog, older x86 cores suffer from store forwarding stall when smaller read doesn't start at the same address. Intel Sandybridge and AMD Steamroller families relaxed this constraint.
