http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48696
--- Comment #1 from Linus Torvalds <torva...@linux-foundation.org> 2011-04-20 04:28:18 UTC --- Side note, this is talked about in the Intel optimization manual 3.6.4 Store Forwarding Under "General Optimization Guidelines" -> "Optimizing Memory Accesses" -> "Store Forwarding". I'm sure people are aware of it, but I'm not certain people realize how horrible the performance hit can be. I have to admit to having been a bit surprised myself just _how_ clearly it shows up in profiles.
