From: Andrew Stubbs <ams@codesourcery.com>
To: Richard Earnshaw <rearnsha@arm.com>
Cc: "gcc-patches@gcc.gnu.org" <gcc-patches@gcc.gnu.org>,
"patches@linaro.org" <patches@linaro.org>
Subject: Re: [PATCH][ARM] NEON DImode not
Date: Thu, 01 Mar 2012 12:57:00 -0000 [thread overview]
Message-ID: <4F4F7226.6070809@codesourcery.com> (raw)
In-Reply-To: <4F4E67B3.8050002@arm.com>
On Wed 29 Feb 2012 18:00:19 GMT, Richard Earnshaw wrote:
> Why can't we have a single insn that deals with the have-neon and
> dont-have-neon cases?
Sorry, I'm not sure I follow?
There's one insn for the have-neon case, and one for the
don't-have-neon. The expander is necessary to prevent gen_one_cmpldi2
locking recog to a disabled pattern (it caches the recog result, I think).
It would be possible to have the arm.md insn emit NEON instructions, but
that's not the usual practice, I think? The neon.md isns could also emit
arm/thumb2 instructions, but there's no real point since there are
already two different splitters for that.
Andrew
next prev parent reply other threads:[~2012-03-01 12:57 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-29 15:24 Andrew Stubbs
2012-02-29 20:03 ` Richard Earnshaw
2012-03-01 12:57 ` Andrew Stubbs [this message]
2012-03-01 17:07 ` Richard Earnshaw
2012-03-08 16:19 ` Andrew Stubbs
2012-03-08 18:03 ` Richard Henderson
2012-03-27 20:24 ` Andrew Stubbs
2012-03-27 20:43 ` Richard Henderson
2012-03-28 13:37 ` Ramana Radhakrishnan
2012-04-05 14:47 ` Andrew Stubbs
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