/[gentoo]/xml/htdocs/doc/en/faq.xml
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96</section> 96</section>
97 <section> 97 <section>
98 <title>I'm finding things to be really unstable and I'm using "-O9 -ffast-math 98 <title>I'm finding things to be really unstable and I'm using "-O9 -ffast-math
99 -fomit-frame-pointer" optimizations. What gives?</title> 99 -fomit-frame-pointer" optimizations. What gives?</title>
100 <body> 100 <body>
101 <p>Don't bother using anything higher than <c>-O3<c> since it isn't support by current versions 101 <p>Don't bother using anything higher than <c>-O3</c> since it isn't support by current versions
102 of gcc. Very aggressive optimizations sometimes cause the compiler to streamline the assembly code 102 of gcc. Very aggressive optimizations sometimes cause the compiler to streamline the assembly code
103 to the point where it doesn't quite do the same thing anymore. A possible setting based on <e>Loc-Dog</e> (on IRC)'s CFLAGS 103 to the point where it doesn't quite do the same thing anymore. A possible setting based on <e>Loc-Dog</e> (on IRC)'s CFLAGS
104 is <c>-O3 -mcpu=i686 -march=i686 -fforce-addr -fomit-frame-pointer -funroll-loops 104 is <c>-O3 -mcpu=i686 -march=i686 -fforce-addr -fomit-frame-pointer -funroll-loops
105 -frerun-cse-after-loop -frerun-loop-opt -falign-functions=4</c>, which is about 105 -frerun-cse-after-loop -frerun-loop-opt -falign-functions=4</c>, which is about
106 as much as I'd want to push global optimization settings. Beyond this, it's best to use 106 as much as I'd want to push global optimization settings. Beyond this, it's best to use

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