------- Comment #4 from meissner at linux dot vnet dot ibm dot com 2009-12-07 18:37 ------- Subject: Re: October 23rd change to tree-ssa-pre.c breaks calculix on powerpc with -ffast-math
On Sun, Dec 06, 2009 at 01:25:15PM -0000, irar at il dot ibm dot com wrote: > > > ------- Comment #3 from irar at il dot ibm dot com 2009-12-06 13:25 ------- > On powerpc64-suse-linux with current trunk calculix failed after a couple of > minutes with > -O3 -maltivec -ffast-math > -O3 -maltivec -ffast-math -fno-tree-vectorize > -O2 -maltivec -ffast-math > -O1 -maltivec -ffast-math > > It is currently running for about an hour with > -O0 -maltivec -ffast-math I suspect you need some amount of optimization to form the negate multiply and subtract/add instruction and -O0 doesn't do the combine step. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42286
