------- Additional Comments From dberlin at gcc dot gnu dot org 2005-01-28 17:22 ------- Subject: Re: missing transformations lead to poorly optimized code
On Fri, 28 Jan 2005, jv244 at cam dot ac dot uk wrote: > > ------- Additional Comments From jv244 at cam dot ac dot uk 2005-01-28 16:31 > ------- > >> You could try "gfortran -O3 -mtune=pentium4 -ffast-math -mfpmath=sse >> -ftree-loop-linear -ftree-vectorize yourcode.f90" and see if it helps. > > Unhappily, seems to make things slower: > > multgen/basic_mult> gfortran -O3 -mtune=pentium4 -ffast-math -mfpmath=sse > -ftree-loop-linear -ftree-vectorize mult.f90 > mult.f90:0: warning: SSE instruction set disabled, using 387 arithmetics You'd need -msse2 or -msse (or is it -march=pentium4 that enables these?) -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14741
