------- Comment #43 from rguenth at gcc dot gnu dot org 2009-12-19 19:29 ------- Btw, with the patch from comment #33 LIM will now hoist the division properly and the performance regression would be fixed(?). The patch will though likely cause verification issues with -fnon-call-exceptions for one and infrastructure-wise is still a hack.
Now testing the orginal testcase on i?86 doesn't show a performance improvement though (but it's marginally faster than with 4.3). Interestingly with -mfpmath=sse -march=native trunk is a lot slower than 4.3 (but 4.3 isn't much faster than trunk w/o that options). The patch from comment #33 seems to recover that. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42108
