[Bug target/31897] [4.3 Regression] 30% speed regression with -m32 on Opteron with rnflow

[hubicka at gcc dot gnu dot org]

------- Comment #6 from hubicka at gcc dot gnu dot org  2007-10-09 14:54 -------
It is little bit sick, but what about implying -mfpmath=sse when
-ftree-vectorize is used and SSE is available?

The reason why we don't default to fpmath=sse is because the extra precision is
told to be part of i386 ABI, with vectorization we are not going to maintain
this "feature" anyway.  

I can easily imagine that many users will try -ftree-vectorize and forget about
-mfpmath...

Honza


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31897