[Bug target/79127] [7 Regression] Error: invalid register for .seh_savexmm in matmul_i4.c

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79127

--- Comment #9 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 40536
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=40536&action=edit
gcc7-pr79127.patch

Untested patch that should make sure HAVE_AVX512F is not enabled if it will not
work properly.  Whether it is a problem with too old binutils, or even latest
binutils don't support it, or a GCC bug in the SEH generation (how can the
xmm16+ regs be expressed as saved there?) aside, this deals just with the
libgfortran side.