From: Richard Henderson <rth@redhat.com>
To: libffi-discuss@sourceware.org
Subject: Re: [PATCH 3/4] s390: Reorganize assembly
Date: Mon, 22 Dec 2014 16:30:00 -0000 [thread overview]
Message-ID: <54984712.2050609@redhat.com> (raw)
In-Reply-To: <20141222122517.GA30481@linux.vnet.ibm.com>
On 12/22/2014 04:25 AM, Dominik Vogt wrote:
> Or rather the attached patch stat replaces
>
> stm %r2,%r3,0(%r12)
> nop
>
> with
>
> st %r2,0(%r12)
> st %r3,4(%r12)
Is that really an improvement?
(1) You now need a branch for the (presumed) normal "int" case.
(2) Is stm really that much faster than two st? I would have
thought the reverse, actually.
r~
next prev parent reply other threads:[~2014-12-22 16:30 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-18 21:33 [PATCH 0/4] s390 improvements Richard Henderson
2014-12-18 21:33 ` [PATCH 3/4] s390: Reorganize assembly Richard Henderson
2014-12-22 12:12 ` Dominik Vogt
2014-12-22 12:25 ` Dominik Vogt
2014-12-22 16:30 ` Richard Henderson [this message]
2014-12-23 9:54 ` Dominik Vogt
2014-12-18 21:33 ` [PATCH 2/4] s390: Avoid aliasing warnings Richard Henderson
2014-12-18 21:33 ` [PATCH 4/4] s390: Use pc-relative insns in 31-bit mode Richard Henderson
2014-12-18 21:33 ` [PATCH 1/4] s390: Kill trailing whitespace Richard Henderson
2014-12-19 15:07 ` [PATCH 0/4] s390 improvements Ulrich Weigand
2014-12-19 15:33 ` Richard Henderson
2014-12-19 16:15 ` Ulrich Weigand
2014-12-19 16:37 ` Richard Henderson
2014-12-19 17:08 ` Ulrich Weigand
2014-12-19 16:43 ` [PATCH 5/4] s390: Inline and tidy ffi_prep_args Richard Henderson
2014-12-22 11:34 ` [PATCH 0/4] s390 improvements Dominik Vogt
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