[Bug sanitizer/55309] gcc's address-sanitizer 66% slower than clang's

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55309

--- Comment #41 from Jakub Jelinek <jakub at gcc dot gnu.org> 2013-02-12 14:11:28 UTC ---
That is definitely stage1 material, and a lot of work, especially to teach the
vectorizer how to deal with these.  And, we don't want to introduce the asan
instrumentation too late, e.g. vectorization often reads even from memory
outside of what the source code actually accesses, when it e.g. knows it is
sufficiently aligned and won't cause crashes.  That would be false positives
for asan.