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From: "mikpe at it dot uu.se" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/53908] [4.6/4.7 Regression] csa removes needed memory load
Date: Tue, 10 Jul 2012 22:50:00 -0000 [thread overview]
Message-ID: <bug-53908-4-KAjAMfsbZd@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-53908-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53908
--- Comment #5 from Mikael Pettersson <mikpe at it dot uu.se> 2012-07-10 22:50:24 UTC ---
On x86_64-linux the SEGV went away on trunk with r186159:
http://gcc.gnu.org/ml/gcc-cvs/2012-04/msg00108.html
http://gcc.gnu.org/ml/gcc-patches/2012-04/msg00202.html
The patch description makes it sound more like a cleanup than fixing actual
bugs, but when I diff the assembly code for the test case with r186158 and
r186159 I see:
--- pr53908.s-r186158 2012-07-11 00:28:57.000000000 +0200
+++ pr53908.s-r186159 2012-07-11 00:34:32.000000000 +0200
...
call is_basic
testl %eax, %eax
- movq 8(%rsp), %rbp
- js .L68
-.L29:
+ js .L29
+.L33:
movq users(%rip), %rbx
+ movq 8(%rsp), %rbp
testq %rbx, %rbx
...
That is, a load is being moved across a control flow insn. All other diffs
seem to just be changed label numbers.
I'll give it some more testing tomorrow.
next prev parent reply other threads:[~2012-07-10 22:50 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-10 3:06 [Bug rtl-optimization/53908] New: [4.7 " hp at gcc dot gnu.org
2012-07-10 9:05 ` [Bug rtl-optimization/53908] " mikpe at it dot uu.se
2012-07-10 9:09 ` rguenth at gcc dot gnu.org
2012-07-10 10:11 ` mikpe at it dot uu.se
2012-07-10 17:03 ` hp at gcc dot gnu.org
2012-07-10 19:55 ` mikpe at it dot uu.se
2012-07-10 22:50 ` mikpe at it dot uu.se [this message]
2012-07-11 6:27 ` [Bug rtl-optimization/53908] [4.6/4.7 " hjl.tools at gmail dot com
2012-07-11 8:05 ` hjl.tools at gmail dot com
2012-07-11 9:46 ` mikpe at it dot uu.se
2012-07-11 12:38 ` hjl.tools at gmail dot com
2012-07-13 6:53 ` hp at gcc dot gnu.org
2012-07-13 8:53 ` hp at gcc dot gnu.org
2012-07-13 8:59 ` hp at gcc dot gnu.org
2012-07-13 17:22 ` hp at gcc dot gnu.org
2012-07-13 17:23 ` hp at gcc dot gnu.org
2012-07-13 17:27 ` hp at gcc dot gnu.org
2012-07-13 17:39 ` [Bug rtl-optimization/53908] [4.6 " steven at gcc dot gnu.org
2012-07-13 17:41 ` steven at gcc dot gnu.org
2012-07-13 19:05 ` steven at gcc dot gnu.org
2012-07-13 19:10 ` hp at gcc dot gnu.org
2012-07-16 9:36 ` steven at gcc dot gnu.org
2012-11-08 22:23 ` steven at gcc dot gnu.org
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