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Old 2010-08-31, 16:18   #19
rogue's Avatar
Apr 2003
Between here and the

22·7·223 Posts

-ffast-math can definitely cause problems.

Follow this link to find some PFGW residues. If your build of phrot results in residues with lots of zeros, then the problem is with the build, most likely -ffast-math.

Since gcc varies slightly from platform to platform it could be another compiler option. I recommend using -O1 and removing all -f switches to see if it works. If it does, then use -O2, then -O3 or add -f switches one at a time to figure out which one is causing the problem.
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