Illegal instruction when running AVX program

I used icpc to compile an AVX program with instruction such as  _mm256_maskload_epi32. 

The program compiles and links fine. When I run it, I got "Illegal instruction" error.

This is on Linux machine, "SLES11SP2-2 Revision 0 ia32e".

I do see "avx" on "/proc/cpuinfo".

If I only have instruction like _mm256_sub_ps, it is fine.

Please help. If it is the hardware limitation, how should I check?

Thanks,