From: Marc Glisse <marc.glisse@inria.fr>
To: "Hurugalawadi, Naveen" <Naveen.Hurugalawadi@caviumnetworks.com>
Cc: Richard Biener <richard.guenther@gmail.com>,
"gcc-patches@gcc.gnu.org" <gcc-patches@gcc.gnu.org>
Subject: Re: Move some bit and binary optimizations in simplify and match
Date: Fri, 16 Oct 2015 11:05:00 -0000 [thread overview]
Message-ID: <alpine.DEB.2.20.1510161238370.7951@laptop-mg.saclay.inria.fr> (raw)
In-Reply-To: <SN2PR0701MB10241785BE597A8D3D648B8C8E3D0@SN2PR0701MB1024.namprd07.prod.outlook.com>
+(match (logical_inverted_value @0)
+ (truth_not @0))
That's good.
+/* Simplify ~X & X as zero. */
+(simplify
+ (bit_and:c (convert? truth_valued_p@0) (convert? (logical_inverted_value @0)))
+ { build_zero_cst (type); })
That's not what Richard meant. We already have:
/* X & !X -> 0. */
(simplify
(bit_and:c @0 (logical_inverted_value @0))
{ build_zero_cst (type); })
which automatically benefits from your addition to logical_inverted_value
(we might indeed want to add some convert? there though). But we still
need what you had in your previous patch:
+/* Simplify ~X & X as zero. */
+(simplify
+ (bit_and:c (convert? @0) (convert? (bit_not @0)))
+ { build_zero_cst (type); })
to simplify the case where X is not a truth value.
(detail: the indentation looks off for (C1/X)*C2)
--
Marc Glisse
next prev parent reply other threads:[~2015-10-16 10:58 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-07 9:54 Hurugalawadi, Naveen
2015-10-08 13:39 ` Richard Biener
2015-10-12 10:22 ` Hurugalawadi, Naveen
2015-10-12 12:49 ` Marc Glisse
2015-10-12 13:11 ` Richard Biener
2015-10-13 10:52 ` Hurugalawadi, Naveen
2015-10-13 11:38 ` Marc Glisse
2015-10-13 11:57 ` Richard Biener
2015-10-13 12:18 ` Marc Glisse
2015-10-13 12:50 ` Richard Biener
2015-10-14 5:13 ` Hurugalawadi, Naveen
2015-10-14 5:40 ` Marc Glisse
2015-10-14 10:09 ` Richard Biener
2015-10-14 10:45 ` Marc Glisse
2015-10-14 10:53 ` Richard Biener
2015-10-14 11:38 ` Marc Glisse
2015-10-15 6:11 ` Hurugalawadi, Naveen
2015-10-15 12:38 ` Richard Biener
2015-10-16 10:30 ` Hurugalawadi, Naveen
2015-10-16 11:05 ` Marc Glisse [this message]
2015-10-19 11:14 ` Hurugalawadi, Naveen
2015-10-19 13:04 ` Richard Biener
2015-10-19 11:22 ` Hurugalawadi, Naveen
2015-10-19 11:42 ` Marc Glisse
2015-10-20 6:48 ` Hurugalawadi, Naveen
2015-10-20 12:13 ` Richard Biener
2015-10-21 4:05 ` Hurugalawadi, Naveen
2015-10-21 7:26 ` Marc Glisse
2015-10-21 9:49 ` Richard Biener
2015-10-23 5:11 ` Hurugalawadi, Naveen
2015-10-23 9:07 ` Richard Biener
2015-10-24 21:37 ` Marc Glisse
2015-10-26 9:29 ` Richard Biener
2015-10-26 9:33 ` Richard Biener
2015-10-08 16:58 ` Bernd Schmidt
2015-10-08 18:03 ` Joseph Myers
2015-10-08 18:15 ` Bernd Schmidt
2015-10-09 9:32 ` Richard Biener
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