http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47692
--- Comment #9 from Harald Anlauf <anlauf at gmx dot de> 2011-02-11 20:24:27 UTC --- (In reply to comment #7) > Interesting, I just built this a few days ago using trunk and ran make testing > without any errors, but I had no optimization turned on. When I get back to my > machine at home I will redo this and grep for Fails. I just found that some testcases still have the old problem of using the wrong threshold. cblat3.f tries to compute EPS and finds (see cblat3.out) RELATIVE MACHINE PRECISION IS TAKEN TO BE 1.1E-19 when using the 387 fpu, while with -mfpmath=sse I get: RELATIVE MACHINE PRECISION IS TAKEN TO BE 1.2E-07 So my suggestion is to add -march=native -mfpmath=sse to the compiler flags. This is not a gfortran problem, but a BLAS testsuite bug.
