From: Ayonam Ray <ayonam@gmail.com>
To: Ian Lance Taylor <iant@google.com>
Cc: gcc-help@gcc.gnu.org
Subject: Re: How do we access higher order bits of a register?
Date: Wed, 23 Nov 2011 00:47:00 -0000 [thread overview]
Message-ID: <CA+V5N8nDb5vM+f5gLNFZz7axdew=t960Ztf2uM-JROb1MxUskA@mail.gmail.com> (raw)
In-Reply-To: <mcrvcqcc97r.fsf@dhcp-172-18-216-180.mtv.corp.google.com>
On 22 November 2011 23:48, Ian Lance Taylor <iant@google.com> wrote:
> Ayonam Ray <ayonam@gmail.com> writes:
>
>> On 22 November 2011 20:30, Ian Lance Taylor <iant@google.com> wrote:
>>> Ayonam Ray <ayonam@gmail.com> writes:
>>>
>>>> I wanted to write an RTL that would access the higher order bits of a
>>>> register. I saw that high:<mode> works only with constants or labels.
>>>> The subreg:<mode> only takes the lower order bits. Can't find any
>>>> way to address the higher order bits. Any help would be appreciated.
>>>
>>> If it is a single hard register, use a shift.
>>>
>>> Ian
>>>
>>
>> Thanks for your reply.
>> It is indeed a single hard register. But I need it as an lvalue.
>
> Use zero_extract.
>
> Ian
>
Thanks Ian.
prev parent reply other threads:[~2011-11-22 22:15 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-22 15:31 Ayonam Ray
2011-11-22 17:06 ` Ian Lance Taylor
2011-11-22 21:39 ` Ayonam Ray
2011-11-22 22:10 ` Ian Lance Taylor
2011-11-23 0:47 ` Ayonam Ray [this message]
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