Hi, Intel published Intel AVX spec:
http://softwareprojects.intel.com/avx/ It extended SSE registers to 256bit. I checked in the AVX binutils support: http://sourceware.org/ml/binutils/2008-04/msg00045.html For 32bit, I used numbers 53-60 for %ymm0-%ymm7. For 64bit, I used numbers 70-85 for %ymm0-%ymm15. Will they work for debugger and unwinder? Thanks. H.J.