http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53081
--- Comment #3 from davidxl <xinliangli at gmail dot com> 2012-04-23 05:34:24 UTC --- (In reply to comment #2) > I should mention I made one patch before based on the vectorizer code which > did > detection of at least memset; it was while I was an intern at Apple. I posted > it and there was some review. And a few years back there was a paper at the > GCC summit about it and expanding it to memcpy. I don't know what happened to > that code though. Some simple analysis using scev to identify loads and stores with linear address should be good enough. LLVM's version also tries to merge smaller memsets into a larger one.
