From: Richard Henderson <rth@twiddle.net>
To: Peter Maydell <peter.maydell@linaro.org>
Cc: rth7680@gmail.com, Petar Jovanovic <petar.jovanovic@rt-rk.com>,
qemu-devel@nongnu.org, blauwirbel@gmail.com, petarj@mips.com,
afaerber@suse.de, aurelien@aurel32.net
Subject: Re: [Qemu-devel] [PATCH v2] target-mips: Fix incorrect shift for SHILO and SHILOV
Date: Wed, 05 Dec 2012 09:51:57 -0600 [thread overview]
Message-ID: <50BF6D9D.2030901@twiddle.net> (raw)
In-Reply-To: <CAFEAcA84izMg3NvzPobYFw7FV2xmBJeizT6PXUscTbPrh4c86g@mail.gmail.com>
On 2012-12-05 09:49, Peter Maydell wrote:
> On 5 December 2012 15:36, Richard Henderson <rth@twiddle.net> wrote:
>> On 2012-12-04 17:29, Petar Jovanovic wrote:
>>> rs5_0 = (int8_t)(rs5_0 << 2) >> 2;
>>
>> This is more portably written as
>>
>> rs5_0 = (rs5_0 ^ 0x20) - 0x20;
>
> ...but way more obscurely. If we want to play that
> kind of game can we have a sign-extension function in
> a header somewhere?
I dunno about more obscurely. It took me a minute to figure out
what was wanted in the original.
As for a helper function... sure.
r~
next prev parent reply other threads:[~2012-12-05 15:52 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-04 23:29 [Qemu-devel] [PATCH v2] target-mips: Fix incorrect shift for SHILO and SHILOV Petar Jovanovic
2012-12-05 15:36 ` Richard Henderson
2012-12-05 15:49 ` Peter Maydell
2012-12-05 15:51 ` Richard Henderson [this message]
2012-12-05 16:38 ` Peter Maydell
2012-12-05 23:16 ` Richard Henderson
2012-12-06 8:17 ` Aurelien Jarno
2012-12-05 20:41 ` Johnson, Eric
2012-12-05 21:36 ` Johnson, Eric
2012-12-05 23:31 ` Jovanovic, Petar
2012-12-06 0:13 ` Johnson, Eric
2012-12-06 8:11 ` Aurelien Jarno
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