From: Chen Gang <xili_gchen_5257@hotmail.com>
To: Jeff Law <law@redhat.com>, bernds@codesourcery.com
Cc: gcc-patches List <gcc-patches@gcc.gnu.org>
Subject: Re: [PATCH] gcc/config/c6x/c6x.md: Remove "clobber (match_scratch ...)" in "movmisalign<mode>_store".
Date: Fri, 27 Mar 2015 00:18:00 -0000 [thread overview]
Message-ID: <BLU436-SMTP430AA53E5FAD24391601CEB9090@phx.gbl> (raw)
In-Reply-To: <BLU436-SMTP54E724354B094F919100DB9090@phx.gbl>
On 3/27/15 08:05, Chen Gang wrote:
> For misalignment memory access, c6x gcc will cause issue, so need remove
> "clobber (match_scratch ...)" which will be symmetric with "movmisalign
> <mode>_load", then pass compiling and generate correct assembly code.
>
> The related issue:
>
> [root@localhost c6x]# cat test.i
> int oxu_driver_init(void)
> {
> *(volatile unsigned int *)(-1) = *(unsigned int *)(-1);
Oh, sorry, I use 11 instead of -1 for generating the assembly code (-1
and 11 lead the same result).
[...]
> oxu_driver_init:
> mvk .d1 11, A4
> ldnw .d1t1 *A4, A3
> nop 4
> stnw .d1t1 A3, *A4
> ret .s2 B3
> nop 5
> .size oxu_driver_init, .-oxu_driver_init
> .ident "GCC: (GNU) 5.0.0 20150321 (experimental)"
>
[...]
Thanks.
--
Chen Gang
Open, share, and attitude like air, water, and life which God blessed
next prev parent reply other threads:[~2015-03-27 0:18 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-27 0:05 Chen Gang
2015-03-27 0:18 ` Chen Gang [this message]
2015-03-27 13:04 ` Bernd Schmidt
2015-03-28 1:32 ` Chen Gang
2015-03-28 6:24 ` Chen Gang
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