This is the mail archive of the
gcc-patches@gcc.gnu.org
mailing list for the GCC project.
Re: [PATCH][AArch64] Replace insn to zero up DF register
- From: Andrew Pinski <pinskia at gmail dot com>
- To: Evandro Menezes <e dot menezes at samsung dot com>
- Cc: GCC Patches <gcc-patches at gcc dot gnu dot org>, Marcus Shawcroft <Marcus dot Shawcroft at arm dot com>, Kyrill Tkachov <kyrylo dot tkachov at arm dot com>
- Date: Tue, 20 Oct 2015 07:51:37 +0800
- Subject: Re: [PATCH][AArch64] Replace insn to zero up DF register
- Authentication-results: sourceware.org; auth=none
- References: <56257F53 dot 2000905 at samsung dot com>
On Tue, Oct 20, 2015 at 7:40 AM, Evandro Menezes <e.menezes@samsung.com> wrote:
> In the existing targets, it seems that it's always faster to zero up a DF
> register with "movi %d0, #0" instead of "fmov %d0, xzr".
I think for ThunderX 1, this change will not make a difference. So I
am neutral on this change.
Thanks,
Andrew
>
> This patch modifies the respective pattern.
>
> Please, commit if it's alright.
>
> Thank you,
>
> --
> Evandro Menezes
>