https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87171
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-09-01
Ever confirmed|0 |1
--- Comment #4 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Jakub Jelinek from comment #3)
> So, your CPU doesn't support AVX, which is why xsave* is turned off:
>
> #define XCR_AVX_ENABLED_MASK \
> (XSTATE_SSE | XSTATE_YMM)
>
> if (has_osxsave)
> asm (".byte 0x0f; .byte 0x01; .byte 0xd0"
> : "=a" (eax), "=d" (edx)
> : "c" (XCR_XFEATURE_ENABLED_MASK));
> else
> eax = 0;
>
> /* Check if AVX registers are supported. */
> if ((eax & XCR_AVX_ENABLED_MASK) != XCR_AVX_ENABLED_MASK)
> {
> has_avx = 0;
> has_avx2 = 0;
> has_fma = 0;
> has_fma4 = 0;
> has_f16c = 0;
> has_xop = 0;
> has_xsave = 0;
> has_xsaveopt = 0;
> has_xsaves = 0;
> has_xsavec = 0;
> }
>
> Is XSAVE* useful for anything when AVX isn't enabled?
XSAVE* are needed for other states. It is wrong to disable XSAVE*
when AVX isn't supported.
