Marc Collin <[EMAIL PROTECTED]> writes: > Le mercredi 13 septembre 2006 11:04, Andreas Jaeger a écrit : >> Marc Collin <[EMAIL PROTECTED]> writes: >> > i use suse 64bits since a couple of release and one thing i notice it's >> > slower than the 32 bits and slower than other 64 bits distribution >> > (fedora and mandrake) >> > >> > don't know if you use tuning option when you build... >> >> We do build with -O2. Such a speed difference is interesting and I >> would be interested in the cause, >> >> >> Andreas > > minimum to be done: -march=x86-64
This is the default for x86-64 ;-) > i think x86 64 bits have minimum sse2 > > -mfpmath=sse2 This is written in the ABI, no need to add it. > -msse2 Same here. > -funroll-all-loops This might be slower in some cases. > -fomit-frame-pointer This is part of the ABI, no need to do it ;-) > -ffast-math You will break applications this way. Andreas -- Andreas Jaeger, [EMAIL PROTECTED], http://www.suse.de/~aj/ SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg, Germany GPG fingerprint = 93A3 365E CE47 B889 DF7F FED1 389A 563C C272 A126
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