From: malc <av1474@comtv.ru>
To: Fabrice Bellard <fabrice@bellard.org>
Cc: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [4705] Fix div[u]2.
Date: Tue, 10 Jun 2008 00:02:48 +0400 (MSD) [thread overview]
Message-ID: <Pine.LNX.4.64.0806100000400.12949@linmac.oyster.ru> (raw)
In-Reply-To: <484CEAFD.9020906@bellard.org>
On Mon, 9 Jun 2008, Fabrice Bellard wrote:
> malc wrote:
>> Revision: 4705
>> http://svn.sv.gnu.org/viewvc/?view=rev&root=qemu&revision=4705
>> Author: malc
>> Date: 2008-06-09 06:06:25 +0000 (Mon, 09 Jun 2008)
>>
>> Log Message:
>> -----------
>> Fix div[u]2.
>>
>> Previous code assummed 32 by 32 bit divmod operation, and survived
>> x86_64 test only by sheer luck. MIPS wasn't so forgiving.
>
> Are you sure it is needed ? div[u]2 support in currently optional in TCG. On
> some hosts such as PowerPC, implementing div[u] directly is simpler. rem[u]
> can be implemented generically then.
When i added TCG_TARGET_HAS_div_i32 plus all that is necessary to handle
div[u]/rem[u]_i32 tcg started to abort at tcg.c:1180 (at least for
arm-softmmu)
--
mailto:av1474@comtv.ru
next prev parent reply other threads:[~2008-06-09 20:02 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-09 6:06 [Qemu-devel] [4705] Fix div[u]2 malc
2008-06-09 8:34 ` Fabrice Bellard
2008-06-09 20:02 ` malc [this message]
2008-06-09 20:21 ` Fabrice Bellard
2008-06-09 23:47 ` malc
2008-06-09 16:44 ` C.W. Betts
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