[Bug c/79177] New: use the register keyword with ymm0 register

[alexander.kjall at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79177

            Bug ID: 79177
           Summary: use the register keyword with ymm0 register
           Product: gcc
           Version: 6.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: alexander.kjall at gmail dot com
  Target Milestone: ---

I'm trying to represent the ymm0 register as a variable with the help of the
register key word.

Code that i have tried:

register int __attribute__ ((vector_size (32))) _YMM0_r asm ("ymm0") = _YMM0;

and

register __m256 _YMM0_r asm ("ymm0") = _YMM0;

And this is the error that I get:

encryptor.c:72:17: error: data type of ‘_YMM0_r’ isn’t suitable for a register
 register __m256 _YMM0_r asm ("ymm0") = _YMM0;

I can't understand in what way the __m256 datatype is unsuitable for the ymm0
register.