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Why does FEMMS instruction cause SIGILL fault?

Question asked by wpiskorz on Nov 21, 2012
Latest reply on Dec 9, 2012 by avk

Hello,  My Opteron 6272 CPU throws a SIGILL (illegal instruction) exception on execution of the FEMMS instruction. I have stumbled upon the error running GotoBLAS library. Is it the hardware error or just a feature of the CPU? It was not easy (although possible) to make GNU or Intel's C compilers to abstain from generating FEMMS...  I sent the question to the TECH.SUPPORT@AMD.COM but after 2 weeks it turned out they did not know the answer. Thanks in advance. Regards, Witold

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