https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89951
Bug ID: 89951
Summary: Uncorrect flag for Nehalem / westmere
Product: gcc
Version: 8.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: bratsinot at gmail dot com
Target Milestone: ---
gcc set uncorrect flags -mavx256-split-unaligned-load and
-mavx256-split-unaligned-store when use -march=native or Nehalem / westmere
arch. Nehalem / westmere don't have AVX instruction set. So program with these
instructions build incorrectly.
For example:
# gcc -march=westmere -Q --help=target ... | grep avx
-mavx [disabled]
<...>
-mavx256-split-unaligned-load [enabled]
-mavx256-split-unaligned-store [enabled]
<...>
