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From: "dje at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/19417] [3.3 only] return value of some functions not properly set (in r3)
Date: Sat, 15 Jan 2005 00:40:00 -0000	[thread overview]
Message-ID: <20050115004010.11684.qmail@sourceware.org> (raw)
In-Reply-To: <20050112234624.19417.cort@fsmlabs.com>


------- Additional Comments From dje at gcc dot gnu dot org  2005-01-15 00:40 -------
The inlined asm rtl_a_set() does not list any outputs or clobbers, so it looks
like the compiler safely can assume that the value is unchanged.  I am not sure
why the compiler can assume that the value is zero, but the asm definitely will
confuse it about the status of the register.  Showing the register as killed in
the asm fixes the code generation.

I am going to mark this as invalid.  Please reopen if you can explain to me why
GCC should behave well with an asm statement that kills the value in a register
but only lists inputs to the data dependency and flow parts of the compiler.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |INVALID


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19417


      parent reply	other threads:[~2005-01-15  0:40 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-01-12 23:46 [Bug c/19417] New: " cort at fsmlabs dot com
2005-01-12 23:48 ` [Bug c/19417] " cort at fsmlabs dot com
2005-01-12 23:48 ` cort at fsmlabs dot com
2005-01-12 23:49 ` cort at fsmlabs dot com
2005-01-12 23:49 ` cort at fsmlabs dot com
2005-01-12 23:51 ` cort at fsmlabs dot com
2005-01-13  0:02 ` pinskia at gcc dot gnu dot org
2005-01-13  0:38 ` [Bug middle-end/19417] " pinskia at gcc dot gnu dot org
2005-01-13  0:44 ` pinskia at gcc dot gnu dot org
2005-01-14 23:24 ` [Bug middle-end/19417] [3.3 only] " pinskia at gcc dot gnu dot org
2005-01-15  0:40 ` dje at gcc dot gnu dot org [this message]

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