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From: "mikpe at it dot uu.se" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/48090] gcc 4.5.2 miscompilation when building on arm
Date: Sun, 13 Mar 2011 15:09:00 -0000 [thread overview]
Message-ID: <bug-48090-4-Yum1TpqPJd@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-48090-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48090
Mikael Pettersson <mikpe at it dot uu.se> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |rearnsha at gcc dot gnu.org
--- Comment #7 from Mikael Pettersson <mikpe at it dot uu.se> 2011-03-13 15:09:36 UTC ---
The miscompilation on 4.5 branch started with r154181, the PR42031 fix; see
<http://gcc.gnu.org/ml/gcc-patches/2009-11/msg00725.html>.
On the standalone test case, r154181 changed the -march=armv5t -O2 code as
follows:
--- pr48090.s-r154180 2011-03-13 15:39:16.000000000 +0100
+++ pr48090.s-r154181 2011-03-13 15:43:21.000000000 +0100
@@ -81,11 +81,9 @@
mov r6, r1
bl seek_archive
cmp r1, #0
- mov r3, r0
- mov r4, r1
blt .L14
- rsbs r1, r3, #0
- rsc r2, r4, #0
+ rsbs r1, r0, #0
+ rsc r2, r1, #0
mov r4, r2, asl #9
mov r3, r1, asl #9
orr r4, r4, r1, lsr #23
which breaks the second 'rsc' insn since it now reads the updated r1 value
instead of the original one.
next prev parent reply other threads:[~2011-03-13 15:09 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-12 9:01 [Bug c/48090] New: " arnaud.patard@rtp-net.org
2011-03-12 9:02 ` [Bug c/48090] " arnaud.patard@rtp-net.org
2011-03-12 12:03 ` mikpe at it dot uu.se
2011-03-12 12:16 ` arnaud.patard@rtp-net.org
2011-03-12 15:42 ` mikpe at it dot uu.se
2011-03-12 17:38 ` mikpe at it dot uu.se
2011-03-12 21:33 ` mikpe at it dot uu.se
2011-03-13 15:09 ` mikpe at it dot uu.se [this message]
2011-03-13 19:33 ` mikpe at it dot uu.se
2011-03-13 20:40 ` arnaud.patard@rtp-net.org
2011-03-14 10:32 ` [Bug target/48090] [4.5 Regression] " rguenth at gcc dot gnu.org
2011-04-10 10:42 ` rguenth at gcc dot gnu.org
2011-04-11 10:24 ` ramana at gcc dot gnu.org
2011-04-12 13:43 ` ramana at gcc dot gnu.org
2011-04-12 13:53 ` ramana at gcc dot gnu.org
2011-04-12 13:53 ` ramana at gcc dot gnu.org
2011-04-12 13:56 ` froydnj at codesourcery dot com
2011-04-13 7:41 ` ramana at gcc dot gnu.org
2011-04-13 7:56 ` ramana at gcc dot gnu.org
2011-04-27 10:08 ` ramana at gcc dot gnu.org
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