Comment 3 for bug 956051

Hi

Some additional information that leads me to believe this is a xen issue.

gcc 4.6.3 code has the following

#define OPTION_MASK_ISA_FMA4_SET \
  (OPTION_MASK_ISA_FMA4 | OPTION_MASK_ISA_SSE4A_SET \
   | OPTION_MASK_ISA_AVX_SET)

So when you use -mfma4 option it also enables avx instruction set.

I believe xen likely should be filtering out fma4 support if its doing the same for avx.

thanks
jim