From: chenglulu <chenglulu@loongson.cn>
To: Xi Ruoyao <xry111@xry111.site>, gcc-patches@gcc.gnu.org
Cc: Chenghui Pan <panchenghui@loongson.cn>,
i@xen0n.name, xuchenghua@loongson.cn
Subject: Re: [PATCH] LoongArch: Use LSX and LASX for block move
Date: Sat, 9 Sep 2023 15:14:17 +0800 [thread overview]
Message-ID: <0140721c-9281-a832-2874-04230af24698@loongson.cn> (raw)
In-Reply-To: <f366ab1e287fe9d6fc7f95df4d8ecce1b166b4a9.camel@xry111.site>
在 2023/9/9 下午3:06, Xi Ruoyao 写道:
> On Sat, 2023-09-09 at 15:04 +0800, chenglulu wrote:
>> Hi,RuoYao:
>>
>> I think the test example memcpy-vec-3.c submitted in r14-3818 is
>> implemented incorrectly.
>>
>> The 16-byte length in this test example will cause can_move_by_pieces to
>> return true when with '-mstrict-align', so no vector load instructions
>> will be generated.
> Yes, in this case we cannot use vst because we don't know if b is
> aligned. Thus a { scan-assembler-not "vst" } guarantees that.
>
> Or am I understanding something wrongly here?
>
Well, what I mean is that even if '-mno-strict-align' is used here,
vst/vld will not be used,
so this test example cannot test what we want to test.
next prev parent reply other threads:[~2023-09-09 7:14 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-07 16:14 Xi Ruoyao
2023-09-09 6:10 ` chenglulu
2023-09-09 7:03 ` Pushed: [PATCH v2] " Xi Ruoyao
2023-09-09 7:04 ` [PATCH] " chenglulu
2023-09-09 7:06 ` Xi Ruoyao
2023-09-09 7:14 ` chenglulu [this message]
2023-09-09 7:15 ` Xi Ruoyao
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