------- Comment #3 from ubizjak at gmail dot com 2007-07-04 12:29 ------- (In reply to comment #2) > Can't reproduce this, gcc 4.3 actually seems to be faster (tests done on Intel > quadcore Core2):
On core2 the bug doesn't trigger, but it shows on FC4 with: vendor_id : GenuineIntel cpu family : 15 model : 4 model name : Intel(R) Xeon(TM) CPU 3.60GHz stepping : 10 cpu MHz : 3600.970 cache size : 2048 KB This is one of most mysterious bugs I've ever seen. The _idamax routine is exactly the same for both builds, but it shows such a difference. I have analyzed this with cachegrind but nothing sticks out there. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31897
