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From: "hjl.tools at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/66334] cleanup block fails to initialize EBX
Date: Fri, 03 Jul 2015 18:42:00 -0000 [thread overview]
Message-ID: <bug-66334-4-frNQgsjBlf@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-66334-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66334
--- Comment #8 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Vladimir Makarov from comment #7)
> I've looked at this. Insn 34 is transformed into
>
> ebx=ebx
>
> as pseudo 87 gets ebx. At the very end. LRA removes the useless insn.
> Therefore there is no insn setting ebx.
>
> H.J., is it really a problem?
The problem is although ebx, which is used for PIC, is callee saved, but
ebx has junk when called from BUILT_IN_UNWIND_RESUME. LRA should
reinitialize it.
next prev parent reply other threads:[~2015-07-03 18:42 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-29 2:50 [Bug middle-end/66334] New: " hjl.tools at gmail dot com
2015-05-29 2:56 ` [Bug middle-end/66334] " hjl.tools at gmail dot com
2015-05-29 20:37 ` hjl.tools at gmail dot com
2015-05-29 21:54 ` hjl.tools at gmail dot com
2015-05-29 21:55 ` hjl.tools at gmail dot com
2015-05-31 13:16 ` hjl.tools at gmail dot com
2015-06-01 14:21 ` hjl.tools at gmail dot com
2015-07-03 17:25 ` vmakarov at gcc dot gnu.org
2015-07-03 18:42 ` hjl.tools at gmail dot com [this message]
2015-07-03 21:04 ` vmakarov at gcc dot gnu.org
2015-07-04 13:57 ` hjl.tools at gmail dot com
2015-07-07 19:35 ` vmakarov at gcc dot gnu.org
2015-07-08 15:05 ` vmakarov at gcc dot gnu.org
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