[Bug target/13041] New: linux-2.6/sound/core/oss/rate.c miscompiled

[Bug target/13041] New: linux-2.6/sound/core/oss/rate.c miscompiled

[debian-gcc at lists dot debian dot org]

[ forwarded from http://bugs.debian.org/219949 ]

gcc-3.3.2 release:

gcc -march=i386 -fomit-frame-pointer -O2

miscompiles sound/core/oss/rate.c in Linux 2.6.0-test9.

I've attached the preprocessed source that demonstrates the
problem.

In the assembly output with -S, look for the 5th label in
get_s16_labels.0.  That label should do a word load, but
instead it does a double word load:

.L4:
        movl    (%ebp), %eax
        jmp     .L111

-- 
           Summary: linux-2.6/sound/core/oss/rate.c miscompiled
           Product: gcc
           Version: 3.3.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: target
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: debian-gcc at lists dot debian dot org
                CC: gcc-bugs at gcc dot gnu dot org,herbert at gondor dot
                    apana dot org dot au
 GCC build triplet: 386-linux
  GCC host triplet: i386-linux
GCC target triplet: 386-linux


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13041

[Bug target/13041] linux-2.6/sound/core/oss/rate.c miscompiled

[debian-gcc at lists dot debian dot org]

------- Additional Comments From debian-gcc at lists dot debian dot org  2003-11-13 19:15 -------
Created an attachment (id=5131)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=5131&action=view)
preprocessed source


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13041

[Bug target/13041] [3.3 Regression] linux-2.6/sound/core/oss/rate.c miscompiled

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2003-11-13 19:37 -------
On the mainline the asm looks like:
        movw    (%edi), %ax
        movw    %ax, (%esp)



-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |critical
           Keywords|                            |wrong-code
            Summary|linux-                      |[3.3 Regression] linux-
                   |2.6/sound/core/oss/rate.c   |2.6/sound/core/oss/rate.c
                   |miscompiled                 |miscompiled
   Target Milestone|---                         |3.3.3


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13041

[Bug target/13041] [3.3 Regression] linux-2.6/sound/core/oss/rate.c miscompiled

[ebotcazou at gcc dot gnu dot org]

------- Additional Comments From ebotcazou at gcc dot gnu dot org  2003-11-14 14:16 -------
Confirmed, GCC has no right to "promote" the memory access.


-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|                            |1
   Last reconfirmed|0000-00-00 00:00:00         |2003-11-14 14:16:37
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13041

[Bug target/13041] [3.3 Regression] linux-2.6/sound/core/oss/rate.c miscompiled

[ebotcazou at gcc dot gnu dot org]

------- Additional Comments From ebotcazou at gcc dot gnu dot org  2003-11-14 14:17 -------
Fixing.


-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|unassigned at gcc dot gnu   |ebotcazou at gcc dot gnu dot
                   |dot org                     |org
             Status|NEW                         |ASSIGNED


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13041

[Bug optimization/13041] [3.3 Regression] linux-2.6/sound/core/oss/rate.c miscompiled

[ebotcazou at gcc dot gnu dot org]

------- Additional Comments From ebotcazou at gcc dot gnu dot org  2003-11-17 08:37 -------
I think the bug is generic.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|target                      |optimization


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13041

[Bug optimization/13041] [3.3 Regression] linux-2.6/sound/core/oss/rate.c miscompiled

[cvs-commit at gcc dot gnu dot org]

------- Additional Comments From cvs-commit at gcc dot gnu dot org  2003-11-27 06:45 -------
Subject: Bug 13041

CVSROOT:	/cvs/gcc
Module name:	gcc
Changes by:	ebotcazou@gcc.gnu.org	2003-11-27 06:45:25

Modified files:
	gcc            : ChangeLog final.c reload1.c 

Log message:
	PR optimization/13041
	* final.c (frame_pointer_needed): Fix comment.
	* reload1.c (reload): Decrease alignment of the frame
	pointer if it was used for register allocation.

Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/ChangeLog.diff?cvsroot=gcc&r1=2.1834&r2=2.1835
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/final.c.diff?cvsroot=gcc&r1=1.294&r2=1.295
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/reload1.c.diff?cvsroot=gcc&r1=1.413&r2=1.414



-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13041

[Bug optimization/13041] [3.3 Regression] linux-2.6/sound/core/oss/rate.c miscompiled

[cvs-commit at gcc dot gnu dot org]

------- Additional Comments From cvs-commit at gcc dot gnu dot org  2003-12-01 08:18 -------
Subject: Bug 13041

CVSROOT:	/cvs/gcc
Module name:	gcc
Branch: 	gcc-3_3-branch
Changes by:	ebotcazou@gcc.gnu.org	2003-12-01 08:18:40

Modified files:
	gcc            : ChangeLog final.c reload1.c 

Log message:
	Backport from mainline:
	
	2003-11-27  Eric Botcazou  <ebotcazou@libertysurf.fr>
	
	PR optimization/13041
	* final.c (frame_pointer_needed): Fix comment.
	* reload1.c (reload): Decrease alignment of the frame
	pointer if it was used for register allocation.

Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/ChangeLog.diff?cvsroot=gcc&only_with_tag=gcc-3_3-branch&r1=1.16114.2.812&r2=1.16114.2.813
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/final.c.diff?cvsroot=gcc&only_with_tag=gcc-3_3-branch&r1=1.271.2.1&r2=1.271.2.2
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/reload1.c.diff?cvsroot=gcc&only_with_tag=gcc-3_3-branch&r1=1.366.2.6&r2=1.366.2.7



-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13041

[Bug optimization/13041] [3.3 Regression] linux-2.6/sound/core/oss/rate.c miscompiled

[ebotcazou at gcc dot gnu dot org]

------- Additional Comments From ebotcazou at gcc dot gnu dot org  2003-12-01 08:19 -------
See http://gcc.gnu.org/ml/gcc-patches/2003-11/msg01629.html


-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13041