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From: "bonzini at gnu dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/41812] [4.5 Regression] test 20071030-1.c fails execution on powerpc64
Date: Wed, 28 Oct 2009 12:21:00 -0000	[thread overview]
Message-ID: <20091028122138.10442.qmail@sourceware.org> (raw)
In-Reply-To: <bug-41812-4503@http.gcc.gnu.org/bugzilla/>



------- Comment #3 from bonzini at gnu dot org  2009-10-28 12:21 -------
The patch is wrong because the result of MD is used also to process notes,
while the live registers problem does not consider a register live if it is
only used in notes.  We have:

;; lr  in        1 [1] 2 [2] 31 [31] 67 [ap] 113 [sfp] 154 180

   88 {r179:SF=float(r180:DI);clobber scratch;}
      REG_EQUAL: float(r155:DI)

Then because r155 is not live, it is not included in MD and a random definition
(0.0) is replaced in the REG_EQUAL note.

I'll revert the patch.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41812


  parent reply	other threads:[~2009-10-28 12:21 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-10-23 23:49 [Bug middle-end/41812] New: " janis at gcc dot gnu dot org
2009-10-23 23:51 ` [Bug middle-end/41812] " janis at gcc dot gnu dot org
2009-10-24  8:42 ` bonzini at gnu dot org
2009-10-24 11:51 ` [Bug middle-end/41812] [4.5 Regression] " rguenth at gcc dot gnu dot org
2009-10-24 12:12 ` dominiq at lps dot ens dot fr
2009-10-28 12:21 ` bonzini at gnu dot org [this message]
2009-10-28 12:37 ` bonzini at gcc dot gnu dot org
2009-10-28 14:27 ` bonzini at gnu dot org
2009-10-29 16:52 ` law at gcc dot gnu dot org
2009-11-30  7:35 ` [Bug rtl-optimization/41812] " bonzini at gcc dot gnu dot org

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