From: Bernd Schmidt <bschmidt@redhat.com>
To: Richard Biener <rguenther@suse.de>, Jakub Jelinek <jakub@redhat.com>
Cc: Kyrill Tkachov <kyrylo.tkachov@foss.arm.com>,
Uros Bizjak <ubizjak@gmail.com>,
GCC Patches <gcc-patches@gcc.gnu.org>
Subject: Re: [PATCH][v3] GIMPLE store merging pass
Date: Wed, 07 Sep 2016 13:32:00 -0000 [thread overview]
Message-ID: <4f894602-e64c-f571-6c50-5239a175bd02@redhat.com> (raw)
In-Reply-To: <alpine.LSU.2.11.1609071010210.26629@t29.fhfr.qr>
On 09/07/2016 10:19 AM, Richard Biener wrote:
> On Tue, 6 Sep 2016, Jakub Jelinek wrote:
>> If you want a 64-bit store, you'd need to merge the two, and that would be
>> even more expensive. It is a matter of say:
>> movl $0x12345678, (%rsp)
>> movl $0x09abcdef, 4(%rsp)
>> vs.
>> movabsq $0x09abcdef12345678, %rax
>> movq %rax, (%rsp)
>> vs.
>> movl $0x09abcdef, %eax
>> salq $32, %rax
>> orq $0x12345678, %rax
>> movq $rax, (%rsp)
>
> vs.
>
> movq $LC0, (%rsp)
>
> ?
Not the same. That moves the address of $LC0.
Bernd
next prev parent reply other threads:[~2016-09-07 13:07 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-06 15:16 Kyrill Tkachov
2016-09-06 15:33 ` Jakub Jelinek
2016-09-06 16:21 ` Kyrill Tkachov
2016-09-06 16:34 ` Jakub Jelinek
2016-09-06 16:38 ` Kyrill Tkachov
2016-09-07 9:11 ` Richard Biener
2016-09-07 12:43 ` Jeff Law
2016-09-07 13:32 ` Bernd Schmidt [this message]
2016-09-07 20:47 ` Jakub Jelinek
2016-09-07 20:44 ` Bernhard Reutner-Fischer
2016-09-08 8:54 ` Kyrill Tkachov
2016-09-08 15:47 ` Bernhard Reutner-Fischer
2016-09-13 9:47 ` Kyrill Tkachov
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