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From: "ebotcazou at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug inline-asm/43998] inline assembler: can't set clobbering for input register
Date: Fri, 14 May 2010 07:11:00 -0000 [thread overview]
Message-ID: <20100514071049.14245.qmail@sourceware.org> (raw)
In-Reply-To: <bug-43998-17114@http.gcc.gnu.org/bugzilla/>
------- Comment #12 from ebotcazou at gcc dot gnu dot org 2010-05-14 07:10 -------
> the compiler may think that "something" do not modify eax. So next assignment
> may use eax ( mov eax, x ). So, "it does not make sense to have it as a
> clobber" is not correct. does not it ?
Andrew was saying that it doesn't make sense to consider input operands as
clobbered by an inline asm, generically.
> And the second, "Because the way the constraints are implemented inside GCC,
> an input constraint cannot overlap with a clobber." - It definitely the bug.
No, it isn't, it's clearly stated in the manual: "You may not write a clobber
description in a way that overlaps with an input or output operand."
--
ebotcazou at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |ebotcazou at gcc dot gnu dot
| |org
Status|UNCONFIRMED |RESOLVED
Resolution| |INVALID
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43998
next prev parent reply other threads:[~2010-05-14 7:11 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-06 6:37 [Bug inline-asm/43998] New: " socketpair at gmail dot com
2010-05-06 7:11 ` [Bug inline-asm/43998] " ubizjak at gmail dot com
2010-05-06 8:07 ` jakub at gcc dot gnu dot org
2010-05-06 11:00 ` socketpair at gmail dot com
2010-05-06 11:31 ` rguenth at gcc dot gnu dot org
2010-05-06 11:41 ` socketpair at gmail dot com
2010-05-06 13:09 ` hjl dot tools at gmail dot com
2010-05-06 13:42 ` socketpair at gmail dot com
2010-05-06 13:56 ` rguenth at gcc dot gnu dot org
2010-05-06 15:04 ` socketpair at gmail dot com
2010-05-14 2:45 ` pinskia at gcc dot gnu dot org
2010-05-14 6:31 ` socketpair at gmail dot com
2010-05-14 7:11 ` ebotcazou at gcc dot gnu dot org [this message]
[not found] <bug-43998-4@http.gcc.gnu.org/bugzilla/>
2013-04-08 8:04 ` ilya.lesokhin at gmail dot com
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