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From: "bonzini at gnu dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/35281] [4.3/4.4 Regression] multiply with 0 generated for 64*32->64
Date: Wed, 05 Mar 2008 13:22:00 -0000 [thread overview]
Message-ID: <20080305132129.19338.qmail@sourceware.org> (raw)
In-Reply-To: <bug-35281-10175@http.gcc.gnu.org/bugzilla/>
------- Comment #8 from bonzini at gnu dot org 2008-03-05 13:21 -------
Should be handled by this code in simplify_subreg:
/* A SUBREG resulting from a zero extension may fold to zero if
it extracts higher bits that the ZERO_EXTEND's source bits. */
if (GET_CODE (op) == ZERO_EXTEND
&& bitpos >= GET_MODE_BITSIZE (GET_MODE (XEXP (op, 0))))
return CONST0_RTX (outermode);
fwprop does not because the memory is written to. Can anyone run spec moving
fwprop *before* CSE instead of after?
--
bonzini at gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
BugsThisDependsOn| |13724
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35281
next prev parent reply other threads:[~2008-03-05 13:22 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-02-21 20:50 [Bug rtl-optimization/35281] New: [4.3 regression] " astrange at ithinksw dot com
2008-02-21 21:36 ` [Bug rtl-optimization/35281] " ubizjak at gmail dot com
2008-02-21 21:59 ` astrange at ithinksw dot com
2008-03-05 10:15 ` ubizjak at gmail dot com
2008-03-05 10:17 ` ubizjak at gmail dot com
2008-03-05 10:28 ` [Bug rtl-optimization/35281] [4.3/4.4 Regression] " rguenth at gcc dot gnu dot org
2008-03-05 10:33 ` ubizjak at gmail dot com
2008-03-05 11:11 ` ubizjak at gmail dot com
2008-03-05 13:22 ` bonzini at gnu dot org
2008-03-05 13:22 ` bonzini at gnu dot org [this message]
2008-03-10 14:15 ` bonzini at gnu dot org
2008-03-10 15:19 ` bonzini at gnu dot org
2008-03-11 16:49 ` bonzini at gcc dot gnu dot org
2008-03-11 16:49 ` bonzini at gnu dot org
2008-04-02 9:58 ` bonzini at gnu dot org
2008-04-02 11:25 ` [Bug rtl-optimization/35281] [4.3 " bonzini at gnu dot org
2008-04-03 5:38 ` bonzini at gcc dot gnu dot org
2008-06-06 15:02 ` rguenth at gcc dot gnu dot org
2008-07-14 16:08 ` bonzini at gnu dot org
2008-07-18 11:46 ` bonzini at gcc dot gnu dot org
2008-07-18 11:46 ` bonzini at gnu dot org
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