From: Kirill Yukhin <kirill.yukhin@gmail.com>
To: Richard Henderson <rth@redhat.com>
Cc: Ian Lance Taylor <iant@google.com>,
Uros Bizjak <ubizjak@gmail.com>, "H.J. Lu" <hjl.tools@gmail.com>,
gcc@gcc.gnu.org
Subject: Re: Defining constraint for registers tuple
Date: Tue, 16 Aug 2011 17:32:00 -0000 [thread overview]
Message-ID: <CAGs3RfvWaate8z4ERpSzf7YrJYbBKqTNSjEHKxszUc2DBs=hOQ@mail.gmail.com> (raw)
In-Reply-To: <4E4A8592.1060503@redhat.com>
That is exactly it! Thank you very much!
BMI2 support is almost here :)
--
K
On Tue, Aug 16, 2011 at 6:58 PM, Richard Henderson <rth@redhat.com> wrote:
> On 08/16/2011 04:20 AM, Kirill Yukhin wrote:
>> Hi guys,
>> the question is still opened. Let me try to explain further.
>>
>> The new MULX instruction is capable to store result of unsigned
>> multiply to arbitrary pair of GPRs (one of operands still must be DX).
>> But I have no idea, how to implement such a constraint.
>> Here is define_insn which is works but uses i386's "A" constraint. It
>> is much worse than using any pair of registers.
>
> See {u}mulsidi3_internal in mn10300.md for an example of a
> double-word multiplication with two independent outputs.
>
>
> r~
>
prev parent reply other threads:[~2011-08-16 17:32 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-29 10:56 Kirill Yukhin
2011-07-29 14:55 ` Ian Lance Taylor
2011-08-01 12:28 ` Kirill Yukhin
2011-08-16 11:20 ` Kirill Yukhin
2011-08-16 14:58 ` Richard Henderson
2011-08-16 17:32 ` Kirill Yukhin [this message]
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