https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91695
Bug ID: 91695
Summary: [X86] get_available_features only sets FEATURE_GFNI
and FEATURE_VPCLMULQDQ when avx512_usable is true
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libgcc
Assignee: unassigned at gcc dot gnu.org
Reporter: craig.topper at gmail dot com
Target Milestone: ---
GFNI has instructions that have legacy SSE-like encodings. It also has VEX and
EVEX encodings. VPCLMULQDQ has a VEX encoding for 256-bit and EVEX encoding
256-bit and 512-bit. So these features are usable without AVX512.
It probably makes sense to qualify VPCLMULQDQ with avx_usable since it requires
at least ymm registers.
