Done as revision r270843.
Dominique
> Le 3 mai 2019 à 11:06, Martin Liška a écrit :
>
> Feel free to install the patch please.
>
> Martin
On 5/3/19 11:04 AM, Dominique d'Humières wrote:
> Hi Martin
>
> On Tue, Apr 30, 2019 at 10:00:07AM -0600, Jeff Law wrote:
>>> 2019-04-23 Martin Liska
>>>
>>> PR target/88809
>>> * config/i386/i386.c (ix86_expand_strlen): Use strlen call.
>>> With -minline-all-stringops use inline
Hi Martin
On Tue, Apr 30, 2019 at 10:00:07AM -0600, Jeff Law wrote:
> > 2019-04-23 Martin Liska
> >
> > PR target/88809
> > * config/i386/i386.c (ix86_expand_strlen): Use strlen call.
> > With -minline-all-stringops use inline expansion using 4B loop.
> > * doc/invoke.texi:
On 5/2/19 11:36 PM, Jakub Jelinek wrote:
> On Tue, Apr 30, 2019 at 10:00:07AM -0600, Jeff Law wrote:
>>> 2019-04-23 Martin Liska
>>>
>>> PR target/88809
>>> * config/i386/i386.c (ix86_expand_strlen): Use strlen call.
>>> With -minline-all-stringops use inline expansion using 4B
On Tue, Apr 30, 2019 at 10:00:07AM -0600, Jeff Law wrote:
> > 2019-04-23 Martin Liska
> >
> > PR target/88809
> > * config/i386/i386.c (ix86_expand_strlen): Use strlen call.
> > With -minline-all-stringops use inline expansion using 4B loop.
> > * doc/invoke.texi: Document the
On 4/29/19 4:47 AM, Martin Liška wrote:
> On 4/26/19 11:05 AM, Martin Liška wrote:
>> Then I'm very open to adjust that even for -Os to 'call strlen'.
> That said, I'm suggesting following updated patch.
>
> Patch can bootstrap on x86_64-linux-gnu and survives regression tests.
>
> Thanks,
>
On 4/26/19 11:05 AM, Martin Liška wrote:
> Then I'm very open to adjust that even for -Os to 'call strlen'.
That said, I'm suggesting following updated patch.
Patch can bootstrap on x86_64-linux-gnu and survives regression tests.
Thanks,
Martin
>From 435de2e8b88b2d9898901f2343e03102da367982 Mon
On 4/26/19 10:43 AM, Alexander Monakov wrote:
> On Fri, 26 Apr 2019, Martin Liška wrote:
>
>> I'm suggesting to adjust that to:
>> - -Os will keep using rep-scasb as -Os means optimize for size
>> no matter what speed impact is
>
> I'm not sure it's a good choice, the inline sequence is
>
>
On Fri, 26 Apr 2019, Martin Liška wrote:
> I'm suggesting to adjust that to:
> - -Os will keep using rep-scasb as -Os means optimize for size
> no matter what speed impact is
I'm not sure it's a good choice, the inline sequence is
xorl%eax, %eax
orq $-1, %rcx
Hi.
As mentioned in the PR, strlen expansion leading to rep-scasb leads
to a slow code. The expansion happens for -Os and -O1, with -O2 we
expand into 4B loop if pointer alignment is known to be at least 4.
When using -minline-all-stringops and -O2, the 4B loop happens also
for an unknown
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