On Tue, Aug 17, 2021 at 8:30 AM Wu Jianhua <jianhua...@intel.com> wrote:
>
> Based on IceLake-AVX512 and newer architecture, a broad
> range of the subsets of AVX512 could be supported.
>
> Signed-off-by: Wu Jianhua <jianhua...@intel.com>
> ---
> configure | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/configure b/configure
> index 94b30afe74..04caa25736 100755
> --- a/configure
> +++ b/configure
> @@ -6057,7 +6057,9 @@ EOF
> elf*) enabled debug && append X86ASMFLAGS $x86asm_debug ;;
> esac
>
> - enabled avx512 && check_x86asm avx512_external "vmovdqa32
> [eax]{k1}{z}, zmm0"
> + # Only IceLake and newer architectures could enable AVX512
> + #
> F/CD/BW/DQ/VL/VNNI/IFMA/VBMI/VBMI2/VPOPCNTDQ/BITALG/GFNI/VAES/VPCLMULQDQ
> + enabled avx512 && check_x86asm avx512_external "vpdpwssds
> zmm31{k1}{z}, zmm29, zmm28"
> enabled avx2 && check_x86asm avx2_external "vextracti128 xmm0,
> ymm0, 0"
> enabled xop && check_x86asm xop_external "vpmacsdd xmm0, xmm1,
> xmm2, xmm3"
> enabled fma4 && check_x86asm fma4_external "vfmaddps ymm0, ymm1,
> ymm2, ymm3"
Note that you are just checking the functionality of the assembler
here, not having a runtime impact.
What you would likely want is to update avutil/x86/cpu.c as well to
only enable the AVX512 flag on those CPUs.
- Hendrik
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