https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97688
Bug ID: 97688 Summary: check_vect doesn't detect AVX2 on zen Product: gcc Version: 11.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: testsuite Assignee: unassigned at gcc dot gnu.org Reporter: rguenth at gcc dot gnu.org Target Milestone: --- Running on a zen2 machine (3900X) check_vect() doesn't detect AVX2 which asks for /* Determine what instruction set we've been compiled for, and detect that we're running with it. This allows us to at least do a compile check for, e.g. SSE4.1 when the machine only supports SSE2. */ # if defined(__AVX2__) want_level = 7, want_b = bit_AVX2; but __get_cpuid returns 0 for b __maxlevel is 16 and regs after cpuid are (gdb) info reg rax 0x0 0 rbx 0x0 0 rcx 0x0 0 rdx 0x0 0 rsi 0x68747541 1752462657 rdi 0x0 0