Comments on: -ffast-math scrambles xulrunner http://kmandla.wordpress.com/2008/08/02/ffast-math-scrambles-xulrunner/ K.Mandla's blog of Linux experiences Mon, 11 Feb 2013 18:19:59 +0000 hourly 1 http://wordpress.com/ By: Peterix http://kmandla.wordpress.com/2008/08/02/ffast-math-scrambles-xulrunner/#comment-36789 Sat, 02 Aug 2008 12:18:47 +0000 http://kmandla.wordpress.com/?p=1137#comment-36789 That’s because they compile it twice. First they make a profiling build, run that for a while (click some buttons, browse a bit, run benchmarks, etc.) and then use the collected data to optimize the second build.

It’s called Profile Guided Optimization (PGO).
http://developer.mozilla.org/en/docs/Building_with_Profile-Guided_Optimization

]]> By: xabbott http://kmandla.wordpress.com/2008/08/02/ffast-math-scrambles-xulrunner/#comment-36786 Sat, 02 Aug 2008 02:47:01 +0000 http://kmandla.wordpress.com/?p=1137#comment-36786 I find, in general, compiling Firefox with one set of flags ends up performing worse than the binary they release.

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