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AIX will emulate those instructions not available in POWERPC processors, but you can avoid this emulation and consequent performance degradtation by using only the common to all. If you are using IBM's xlc (cc) compiler, the default is to use the common instruction set. If you want to be explicit, use the -qarch=com option. The option -mcpu=common makes GCC use the common instruction set. Please note that (unlike xlc) this is *not* the default with GCC on AIX.
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Last Update May 13 2007 @ 00:21 AM