From: Jeff Law <law@redhat.com>
To: Rasmus Villemoes <rv@rasmusvillemoes.dk>,
GCC Patches <gcc-patches@gcc.gnu.org>
Cc: Richard Biener <richard.guenther@gmail.com>,
Andrew Pinski <pinskia@gmail.com>
Subject: Re: [PATCH 1/4] match.pd: Add x + (x & 1) -> (x + 1) & ~1 pattern
Date: Fri, 01 May 2015 18:26:00 -0000 [thread overview]
Message-ID: <5543C559.5090809@redhat.com> (raw)
In-Reply-To: <1421837394-7619-2-git-send-email-rv@rasmusvillemoes.dk>
On 01/21/2015 03:49 AM, Rasmus Villemoes wrote:
> gcc.dg/20150120-1.c: New test
>
> Rounding an integer to the next even integer is sometimes written x +=
> x & 1. The equivalent x = (x+1)&~1 usually uses one less register, and
> in practical cases only the new value of x will be used (making it
> unlikely that the subexpression x&1 has any uses).
I bootstrapped and regression tested this on x86_64-linux-gnu, created
the appropriate ChangeLogs and installed the patch on the trunk.
Jeff
next prev parent reply other threads:[~2015-05-01 18:26 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-13 22:47 RFC: Two minor optimization patterns Rasmus Villemoes
2015-01-13 22:56 ` Andrew Pinski
2015-01-14 9:52 ` Richard Biener
2015-01-14 12:45 ` Rasmus Villemoes
2015-01-14 14:01 ` Richard Biener
2015-01-21 10:50 ` [PATCH 0/4] A few " Rasmus Villemoes
2015-01-21 10:50 ` [PATCH 1/4] match.pd: Add x + (x & 1) -> (x + 1) & ~1 pattern Rasmus Villemoes
2015-04-30 9:34 ` Richard Biener
2015-05-01 18:26 ` Jeff Law [this message]
2015-01-21 10:55 ` [PATCH 2/4] match.pd: Add x & ~(x & y) -> x & ~y pattern Rasmus Villemoes
2015-05-01 18:29 ` Jeff Law
2015-01-21 10:58 ` [PATCH 3/4] match.pd: Add x | ~(x | y) -> x | " Rasmus Villemoes
2015-01-21 11:32 ` Marek Polacek
2015-01-21 11:17 ` [PATCH 4/4] match.pd: Add x + ((-x) & m) -> (x + m) & ~m pattern Rasmus Villemoes
2015-04-30 9:42 ` Richard Biener
2015-04-30 11:56 ` Marc Glisse
2015-04-30 12:25 ` Richard Biener
2015-01-14 13:14 ` RFC: Two minor optimization patterns Marc Glisse
2015-01-14 13:58 ` Richard Biener
2015-01-14 14:31 ` Marc Glisse
2015-01-14 14:49 ` Richard Biener
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