------- Comment #4 from hjl dot tools at gmail dot com 2008-10-29 13:08 ------- (In reply to comment #2) > Subject: Re: [4.4 Regression] IRA generates slower > code for -mtune=core2 > > hjl dot tools at gmail dot com wrote: > > ------- Comment #1 from hjl dot tools at gmail dot com 2008-10-29 05:44 > > ------- > > It looks like the cost of loading/storing FP values aren't appropriate for > > Core 2. With this patch: > > Good. Is regmove still helping (which would be the wrong thing to do, > but gives a data point)? > > Paolo >
For this bug, regmove has mixed impacts with updated core2_cost: [EMAIL PROTECTED] regmove]$ ../xgcc -B../ -m32 -O2 /tmp/foo.c -o core2.sse -mtune=core2 -msse3 -mfpmath=sse [EMAIL PROTECTED] regmove]$ ../xgcc -B../ -m32 -O2 /tmp/foo.c -o o2.sse -msse3 -mfpmath=sse [EMAIL PROTECTED] regmove]$ ../xgcc -B../ -m32 -O2 /tmp/foo.c -o core2 -mtune=core2 [EMAIL PROTECTED] regmove]$ ../xgcc -B../ -m32 -O2 /tmp/foo.c -o o2 [EMAIL PROTECTED] regmove]$ time ./o2 real 0m7.995s user 0m7.956s sys 0m0.003s [EMAIL PROTECTED] regmove]$ time ./core2 real 0m7.951s user 0m7.950s sys 0m0.000s [EMAIL PROTECTED] regmove]$ time ./core2.sse real 0m7.358s user 0m7.357s sys 0m0.000s [EMAIL PROTECTED] regmove]$ time ./o2.sse real 0m7.177s user 0m7.176s sys 0m0.000s [EMAIL PROTECTED] regmove]$ -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37948
