So, we'll make an effort to fix problems
with IA32 SSE code generation that were not present in previous releases
-- but we'd probably not worry about shipping GCC 4.0 just because there
were missed optimizations that had also been missed in the past.
That's what i got and the reason why i worried.
You have to admit that pre-4.0 gcc versions were not up to the job
when dealing with SSE: lots of gotcha, poor performance etc (ie
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14776 etc...)
So i really doubt they make a valid standard to measure against.