[Bug lto/54231] LTO generates code for the wrong CPU if different options used

[steven at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54231

--- Comment #5 from Steven Bosscher <steven at gcc dot gnu.org> 2012-08-11 22:46:31 UTC ---
"Fixing" this in the compiler isn't straight-forward. The _mm_stream functions
are just wrappers around builtin functions. It may work correctly if you put
the bzero functions in two separate files or call the builtins directly (a
variant of __builtin_ia32_movntdq in this case), but the way your BZERO is
defined, I don't think it will ever work.

Have you considered using ifunc?