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From: Prakhar Bahuguna <prakhar.bahuguna@arm.com>
To: <richard.sandiford@linaro.org>
Cc: <gcc-patches@gcc.gnu.org>, <nd@arm.com>
Subject: Re: [PATCH, GCC/ARM/gcc-7-branch] Backport PR71607
Date: Wed, 31 May 2017 13:11:00 -0000	[thread overview]
Message-ID: <20170531124844.y263emgdovlu7z2f@e107464-lin.cambridge.arm.com> (raw)
In-Reply-To: <87o9u9mo9v.fsf@linaro.org>

On 31/05/2017 09:19:40, Richard Sandiford wrote:
> const_ints are supposed to be stored in sign-extended form, so a 32-bit
> integer with the MSB set should be 0xffffffff80000000|x instead of
> 0x80000000|x.  It's a bug if you have one where that isn't true.
> 
> In the patch it looks like this could come from:
> ...these two splits, where the GEN_INTs should probably be:
> 
>   gen_int_mode (..., SImode);
> 
> instead.

Hi Richard, thanks for the tip. Is there a test case that could produce an
incorrect result? I've attempted to create one using negative doubles and
floats but haven't succeeded.

Thanks,

-- 

Prakhar Bahuguna

  reply	other threads:[~2017-05-31 12:48 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-05-25 14:02 Prakhar Bahuguna
2017-05-31  8:25 ` Richard Sandiford
2017-05-31 13:11   ` Prakhar Bahuguna [this message]
2017-05-31 13:20     ` Richard Sandiford
2017-05-31 15:40       ` Prakhar Bahuguna
2017-06-01  6:16         ` Richard Sandiford
2017-06-01 10:21           ` Prakhar Bahuguna

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