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Re: [PATCH] S/390: Increase register move costs for CC_REGS
- From: Andreas Krebbel <krebbel at linux dot ibm dot com>
- To: Robin Dapp <rdapp at linux dot ibm dot com>, GCC Patches <gcc-patches at gcc dot gnu dot org>
- Cc: Ilya Leoshkevich <iii at linux dot ibm dot com>
- Date: Mon, 5 Nov 2018 17:39:23 +0100
- Subject: Re: [PATCH] S/390: Increase register move costs for CC_REGS
- References: <3ddc5be6-7e0d-5168-62b2-99bbb2116672@linux.ibm.com>
On 05.11.18 15:38, Robin Dapp wrote:
> Hi,
>
> the attached patch increases the move costs for moves involving the CC
> register. This saves us some instructions in SPEC CPU2006.
>
> Regards
> Robin
>
> --
>
> gcc/ChangeLog:
>
> 2018-11-05 Robin Dapp <rdapp@linux.ibm.com>
>
> * config/s390/s390.c (s390_register_move_cost): Increase costs
> for moves involving the CC reg.
>
Ok. Thanks!
Andreas