From: Eric Botcazou <ebotcazou@adacore.com>
To: Richard Sandiford <rdsandiford@googlemail.com>
Cc: gcc-patches@gcc.gnu.org, Uros Bizjak <ubizjak@gmail.com>
Subject: Re: [PATCH, rtl-optimization]: Fix PR54457, [x32] Fail to combine 64bit index + constant
Date: Wed, 26 Sep 2012 21:38:00 -0000 [thread overview]
Message-ID: <3730255.NiV98gQJ1a@polaris> (raw)
In-Reply-To: <877grgu0yt.fsf@talisman.home>
> I agree (subreg:M (op:N A C) 0) to (op:M (subreg:N (A 0)) C) is
> a good transformation, but why do we need to handle as special
> the case where the subreg is itself the operand of a plus or minus?
> I think it should happen regardless of where the subreg occurs.
Don't we need to restrict this to the low part though?
--
Eric Botcazou
next prev parent reply other threads:[~2012-09-26 21:24 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-25 8:04 Uros Bizjak
2012-09-26 18:17 ` Richard Sandiford
2012-09-26 21:38 ` Eric Botcazou [this message]
2012-09-27 14:25 ` Uros Bizjak
2012-09-27 16:10 ` Richard Sandiford
2012-09-27 18:20 ` [PATCH v2, " Uros Bizjak
2012-09-27 18:35 ` Paul_Koning
2012-09-27 19:21 ` Uros Bizjak
2012-10-02 2:13 ` Andrew Pinski
2012-10-02 19:32 ` Richard Sandiford
2012-10-06 10:22 ` RFA: Simplifying truncation and integer lowpart subregs Richard Sandiford
2012-10-06 11:13 ` Eric Botcazou
2012-10-06 12:39 ` Richard Sandiford
2012-10-06 13:05 ` Eric Botcazou
2012-10-07 8:56 ` Richard Sandiford
2012-10-07 12:36 ` Eric Botcazou
2012-11-28 2:27 ` Ramana Radhakrishnan
2012-11-28 21:45 ` Richard Sandiford
2012-09-27 20:33 ` [PATCH v2, rtl-optimization]: Fix PR54457, [x32] Fail to combine 64bit index + constant Jakub Jelinek
2012-09-27 22:37 ` Richard Sandiford
2012-09-28 15:39 ` Uros Bizjak
2012-09-30 11:40 ` Richard Sandiford
2012-10-03 11:07 ` Paolo Bonzini
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