From: pinskia@gmail.com
To: Kyrill Tkachov <kyrylo.tkachov@arm.com>
Cc: GCC Patches <gcc-patches@gcc.gnu.org>,
Ramana Radhakrishnan <ramana.radhakrishnan@arm.com>,
Richard Earnshaw <Richard.Earnshaw@arm.com>
Subject: Re: [PATCH][ARM][3/3] Implement negsicc, notsicc optabs
Date: Tue, 01 Sep 2015 15:09:00 -0000 [thread overview]
Message-ID: <AC2F9AA5-7DF1-43D5-849F-AEE6E5612B5B@gmail.com> (raw)
In-Reply-To: <55E5BE8C.6080806@arm.com>
> On Sep 1, 2015, at 11:04 PM, Kyrill Tkachov <kyrylo.tkachov@arm.com> wrote:
>
> Hi all,
>
> This third patch implements the new optabs for arm.
> Conveniently, we can reuse the recently refactored *if_neg_move pattern
> and extend it to cover the conditional NOT case.
> Although arm has conditional execution capabilities I have found that
> performing the transformation from patch 1/3 early on benefits arm as well.
> For example for code:
> int
> foonegsi (int a)
> {
> return a ? 25089992 : -25089992;
> }
>
> we currently generate:
> movw r2, #55240
> movw r3, #10296
> cmp r0, #0
> movt r2, 382
> movt r3, 65153
> movne r0, r2
> moveq r0, r3
> bx
>
> whereas with this patch we generate:
> movw r3, #10296
> cmp r0, #0
> movt r3, 65153
> mov r0, r3
> rsbne r0, r3, #0
> bx lr
>
>
> In SPEC2006 this doesn't trigger very often, so there were minimal code differences,
> but overall I claim this patch is an improvement.
>
> Bootstrapped and tested on arm-none-linux-gnueabihf.
>
> Ok for trunk if the midend changes in 1/3 are approved?
ENOPATCH
>
> Thanks,
> Kyrill
>
> 2015-09-01 Kyrylo Tkachov <kyrylo.tkachov@arm.com>
>
> * config/arm/arm.md (<NOT_NEG_op>sicc): New define_expand.
> (*if_neg_move): Rename to...
> (*if_<NOT_NEG_op>_move): ... This. Use NOT_NEG code iterator.
> * config/arm/iterators.md (NOT_NEG): New code iterator.
> (NOT_NEG_op): New code attribute.
>
> 2015-09-01 Kyrylo Tkachov <kyrylo.tkachov@arm.com>
>
> * gcc.target/arm/cond_op_imm_1.c: New test.
>
next prev parent reply other threads:[~2015-09-01 15:09 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-01 15:04 Kyrill Tkachov
2015-09-01 15:09 ` pinskia [this message]
2015-09-01 15:10 Kyrill Tkachov
2015-09-10 9:17 ` Ramana Radhakrishnan
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