On Tue, 2007-06-12 at 23:41 -0400, Dave Jones wrote: > No surprise really. > generic isn't targetting either of the processors you mention. > The idea behind generic is 'optimise for _todays_ CPUs', which > right now typically means Intel Core, and AMD Opteron/Athlon64. > On these platforms, cmov isn't a win (and is even a loss in > some cases). I thought Core is a revival of the PIII core. At any rate, "generic" is an -mtune option only, so alone it will not use cmovs anyway because they're not supported earlier that i686. I just tried it, gcc compiling for i386 uses cmov for a signed divide by 128 with march = i686, pentiumpro, pentium2, pentium3, pentium4, core2 and k8. Compiling for x86_64, it uses cmov on march = generic, k8 and core2.
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