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You might find more up-to-date information at http://www.mpir.org/.
GCC from version 4.6.0 to 4.8.x have a problem with the XOP instruction, especially with ‘-O3’ on at least AMD Opteron ‘62xx/63xx’, ‘FX-(4,6,8)[13]xx’ and the Devil’s Canyon ‘9xxx’ and the Kaveri APUs.
A workaround is to pass ‘-mno-xop’ when compiling with ‘-O3’.