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Re: [PATCH x86_64] Update memcpy, mempcpy and memmove selection order for Excavator CPU BZ #19583
- From: "H.J. Lu" <hjl dot tools at gmail dot com>
- To: "Pawar, Amit" <Amit dot Pawar at amd dot com>
- Cc: "libc-alpha at sourceware dot org" <libc-alpha at sourceware dot org>
- Date: Fri, 18 Mar 2016 08:24:00 -0700
- Subject: Re: [PATCH x86_64] Update memcpy, mempcpy and memmove selection order for Excavator CPU BZ #19583
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On Fri, Mar 18, 2016 at 8:19 AM, Pawar, Amit <Amit.Pawar@amd.com> wrote:
>>One question. If you don't want __memcpy_avx_unaligned, why do you set AVX_Fast_Unaligned_Load?
> Any idea whether currently any other string and memory functions are under implementation based on this? If not then let me just verify it.
>
> Also this feature is enabled in generic code. To disable it, need to change after this.
>
It was done based on assumption that AVX enabled machine has
fast AVX unaligned load. If it isn't true for AMD CPUs, we can enable it
for all Intel AVX CPUs and you can set it for AMD CPUs properly.
--
H.J.
- References:
- [PATCH x86_64] Update memcpy, mempcpy and memmove selection order for Excavator CPU BZ #19583
- Re: [PATCH x86_64] Update memcpy, mempcpy and memmove selection order for Excavator CPU BZ #19583
- RE: [PATCH x86_64] Update memcpy, mempcpy and memmove selection order for Excavator CPU BZ #19583
- Re: [PATCH x86_64] Update memcpy, mempcpy and memmove selection order for Excavator CPU BZ #19583
- RE: [PATCH x86_64] Update memcpy, mempcpy and memmove selection order for Excavator CPU BZ #19583
- Re: [PATCH x86_64] Update memcpy, mempcpy and memmove selection order for Excavator CPU BZ #19583
- RE: [PATCH x86_64] Update memcpy, mempcpy and memmove selection order for Excavator CPU BZ #19583
- Re: [PATCH x86_64] Update memcpy, mempcpy and memmove selection order for Excavator CPU BZ #19583
- RE: [PATCH x86_64] Update memcpy, mempcpy and memmove selection order for Excavator CPU BZ #19583
- Re: [PATCH x86_64] Update memcpy, mempcpy and memmove selection order for Excavator CPU BZ #19583
- Re: [PATCH x86_64] Update memcpy, mempcpy and memmove selection order for Excavator CPU BZ #19583
- RE: [PATCH x86_64] Update memcpy, mempcpy and memmove selection order for Excavator CPU BZ #19583