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Re: [PATCH] x86_64: memcpy/memmove family optimized with AVX512
- From: Florian Weimer <fweimer at redhat dot com>
- To: Andrew Senkevich <andrew dot n dot senkevich at gmail dot com>
- Cc: "H.J. Lu" <hjl dot tools at gmail dot com>, libc-alpha <libc-alpha at sourceware dot org>
- Date: Fri, 15 Jan 2016 23:24:59 +0100
- Subject: Re: [PATCH] x86_64: memcpy/memmove family optimized with AVX512
- Authentication-results: sourceware.org; auth=none
- References: <CAMXFM3uGLiFE+pKPzFgWP6Sx4C3w2Ktd4w3+35O0Bj=B1s0naA at mail dot gmail dot com> <CAMe9rOrTWce2vy0_OUWRH4FVRUSndpuSh2QpkmcMxgSBBEo0Fg at mail dot gmail dot com> <CAMXFM3tOe8UcRRoCQzLxHRt8o-azPQ=OJtHhFHGUDvsHAydoLQ at mail dot gmail dot com> <CAMe9rOreWU8eqsSaQShEY9+=Z6ySOTX+H8DxcYoFNY3i9tHrhg at mail dot gmail dot com> <CAMXFM3tH1FHdigHdYHVQiYafJMOf1=7Fxc+B2H1v11BNYxDgHw at mail dot gmail dot com> <CAMe9rOqeZtmz+LE5vbMSKJkid=7S4YmwR4=AzfuDFO07G6uF+w at mail dot gmail dot com> <CAMXFM3t9Y_YE_2zmPUr-agpMwhxk24OuU4QwY-zuWs-NKDEezA at mail dot gmail dot com>
On 01/15/2016 10:47 PM, Andrew Senkevich wrote:
> diff --git a/sysdeps/x86_64/multiarch/memcpy_chk.S b/sysdeps/x86_64/multiarch/memcpy_chk.S
> index 6476c62..a0d56d4 100644
> --- a/sysdeps/x86_64/multiarch/memcpy_chk.S
> +++ b/sysdeps/x86_64/multiarch/memcpy_chk.S
> @@ -30,7 +30,15 @@
> ENTRY(__memcpy_chk)
> .type __memcpy_chk, @gnu_indirect_function
> LOAD_RTLD_GLOBAL_RO_RDX
> - leaq __memcpy_chk_sse2(%rip), %rax
> +#ifdef HAVE_AVX512_ASM_SUPPORT
> + HAS_ARCH_FEATURE (AVX512F_Usable)
> + jz 1f
> +# HAS_ARCH_FEATURE (Prefer_No_VZEROUPPER)
> +# jz 1f
The two lines starting with â#â look somewhat out of place. Is this
really intended?
Thanks,
Florian