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* [Bug c/42522] New: [m68k] Wrong code generated with -O2/-O3
@ 2009-12-28 20:15 ami_stuff at o2 dot pl
2009-12-28 20:18 ` [Bug c/42522] " ami_stuff at o2 dot pl
` (15 more replies)
0 siblings, 16 replies; 17+ messages in thread
From: ami_stuff at o2 dot pl @ 2009-12-28 20:15 UTC (permalink / raw)
To: gcc-bugs
Hi,
This is a code from "libavformat/flvdec.c":
static int flv_probe(AVProbeData *p)
{
const uint8_t *d;
d = p->buf;
if (d[0] == 'F' && d[1] == 'L' && d[2] == 'V' && d[3] < 5 && d[5]==0 &&
AV_RB32(d+5)>8) {
return AVPROBE_SCORE_MAX;
}
return 0;
}
When I compile FFmpeg with -O2/-O3 options, FFmpeg doesn't recognize FLV files
("Unknown format"), but when I use -O1 everything works correctly.
Here is asm output when I compile flvdec.c file with -O2:
_flv_probe:
clr.l d0
rts
.even
and here when I use -O1:
_flv_probe:
move.l 4(sp),a0
move.l 4(a0),a0
cmp.b #70,(a0)
jne L3
cmp.b #76,1(a0)
jne L4
cmp.b #86,2(a0)
jne L5
cmp.b #4,3(a0)
jhi L6
tst.b 5(a0)
jne L7
move.l 5(a0),d0
moveq #8,d1
cmp.l d0,d1
jcs L8
clr.l d0
rts
L3:
clr.l d0
rts
L4:
clr.l d0
rts
L5:
clr.l d0
rts
L6:
clr.l d0
rts
L7:
clr.l d0
rts
L8:
moveq #100,d0
rts
.even
I attache proprocessed files + asm output in the archive.
--
Summary: [m68k] Wrong code generated with -O2/-O3
Product: gcc
Version: 4.5.0
Status: UNCONFIRMED
Severity: major
Priority: P3
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: ami_stuff at o2 dot pl
GCC host triplet: i686-cygwin
GCC target triplet: m68k-amigaos
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42522
^ permalink raw reply [flat|nested] 17+ messages in thread
* [Bug c/42522] [m68k] Wrong code generated with -O2/-O3
2009-12-28 20:15 [Bug c/42522] New: [m68k] Wrong code generated with -O2/-O3 ami_stuff at o2 dot pl
@ 2009-12-28 20:18 ` ami_stuff at o2 dot pl
2009-12-28 20:23 ` [Bug target/42522] " pinskia at gcc dot gnu dot org
` (14 subsequent siblings)
15 siblings, 0 replies; 17+ messages in thread
From: ami_stuff at o2 dot pl @ 2009-12-28 20:18 UTC (permalink / raw)
To: gcc-bugs
------- Comment #1 from ami_stuff at o2 dot pl 2009-12-28 20:17 -------
Created an attachment (id=19401)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=19401&action=view)
preprocessed files + asm output
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42522
^ permalink raw reply [flat|nested] 17+ messages in thread
* [Bug target/42522] [m68k] Wrong code generated with -O2/-O3
2009-12-28 20:15 [Bug c/42522] New: [m68k] Wrong code generated with -O2/-O3 ami_stuff at o2 dot pl
2009-12-28 20:18 ` [Bug c/42522] " ami_stuff at o2 dot pl
@ 2009-12-28 20:23 ` pinskia at gcc dot gnu dot org
2009-12-28 20:39 ` [Bug c/42522] " ami_stuff at o2 dot pl
` (13 subsequent siblings)
15 siblings, 0 replies; 17+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2009-12-28 20:23 UTC (permalink / raw)
To: gcc-bugs
------- Comment #2 from pinskia at gcc dot gnu dot org 2009-12-28 20:23 -------
Does -O2 -fno-strict-aliasing work?
--
pinskia at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Severity|major |normal
Component|c |target
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42522
^ permalink raw reply [flat|nested] 17+ messages in thread
* [Bug c/42522] [m68k] Wrong code generated with -O2/-O3
2009-12-28 20:15 [Bug c/42522] New: [m68k] Wrong code generated with -O2/-O3 ami_stuff at o2 dot pl
2009-12-28 20:18 ` [Bug c/42522] " ami_stuff at o2 dot pl
2009-12-28 20:23 ` [Bug target/42522] " pinskia at gcc dot gnu dot org
@ 2009-12-28 20:39 ` ami_stuff at o2 dot pl
2009-12-28 23:31 ` schwab at linux-m68k dot org
` (12 subsequent siblings)
15 siblings, 0 replies; 17+ messages in thread
From: ami_stuff at o2 dot pl @ 2009-12-28 20:39 UTC (permalink / raw)
To: gcc-bugs
------- Comment #3 from ami_stuff at o2 dot pl 2009-12-28 20:38 -------
No, asm code looks the same like with -O2 option:
_flv_probe:
clr.l d0
rts
.even
Here are GCC's options which I used (should be included in the first post):
$ make_68k_v45
/bin/ffmpeg13_play/version.sh "/bin/ffmpeg13_play" version.h
/usr/local/amiga/bin/m68k-amigaos-gcc-4.5.0.exe -V 4.5.0 -DHAVE_AV_CONFIG_H -I.
-I"/bin/ffmpeg13_play" --save-temps -S -D_ISOC99_SOURCE
-D_POSIX_C_SOURCE=200112
-D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -DHAVE_BIGENDIAN=1 -m68060 -std=c99
-fno-common -fomit-frame-pointer -Wdeclaration-after-statement -Wall
-Wno-switch
-Wdisabled-optimization -Wpointer-arith -Wredundant-decls -Wcast-qual
-Wwrite-s
trings -Wundef -O2 -S -fno-math-errno -MMD -MF libavformat/flvdec.d -MT
li
bavformat/flvdec.o -c -o libavformat/flvdec.o libavformat/flvdec.c
$ m68k-amigaos-gcc -V 4.5.0 -v
Using built-in specs.
COLLECT_GCC=m68k-amigaos-gcc-4.5.0
COLLECT_LTO_WRAPPER=/usr/local/amiga/libexec/gcc/m68k-amigaos/4.5.0/lto-wrapper.
exe
Target: m68k-amigaos
Configured with: /bernd/gcc4/configure --target=m68k-amigaos --with-cpu=m68040
-
-prefix=/usr/local/amiga
Thread model: single
gcc version 4.5.0 20091224 (experimental) (GCC)
--
ami_stuff at o2 dot pl changed:
What |Removed |Added
----------------------------------------------------------------------------
Severity|normal |major
Component|target |c
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42522
^ permalink raw reply [flat|nested] 17+ messages in thread
* [Bug c/42522] [m68k] Wrong code generated with -O2/-O3
2009-12-28 20:15 [Bug c/42522] New: [m68k] Wrong code generated with -O2/-O3 ami_stuff at o2 dot pl
` (2 preceding siblings ...)
2009-12-28 20:39 ` [Bug c/42522] " ami_stuff at o2 dot pl
@ 2009-12-28 23:31 ` schwab at linux-m68k dot org
2009-12-28 23:38 ` ami_stuff at o2 dot pl
` (11 subsequent siblings)
15 siblings, 0 replies; 17+ messages in thread
From: schwab at linux-m68k dot org @ 2009-12-28 23:31 UTC (permalink / raw)
To: gcc-bugs
------- Comment #4 from schwab at linux-m68k dot org 2009-12-28 23:30 -------
Works for me with 4.5.0 20091228.
--
schwab at linux-m68k dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Severity|major |normal
Status|UNCONFIRMED |RESOLVED
GCC host triplet|i686-cygwin |
GCC target triplet|m68k-amigaos |m68k-*-*
Resolution| |WORKSFORME
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42522
^ permalink raw reply [flat|nested] 17+ messages in thread
* [Bug c/42522] [m68k] Wrong code generated with -O2/-O3
2009-12-28 20:15 [Bug c/42522] New: [m68k] Wrong code generated with -O2/-O3 ami_stuff at o2 dot pl
` (3 preceding siblings ...)
2009-12-28 23:31 ` schwab at linux-m68k dot org
@ 2009-12-28 23:38 ` ami_stuff at o2 dot pl
2009-12-29 1:20 ` ami_stuff at o2 dot pl
` (10 subsequent siblings)
15 siblings, 0 replies; 17+ messages in thread
From: ami_stuff at o2 dot pl @ 2009-12-28 23:38 UTC (permalink / raw)
To: gcc-bugs
------- Comment #5 from ami_stuff at o2 dot pl 2009-12-28 23:38 -------
I found which optimization doesn't work correctly on my config:
-O2 ("Unknown format"):
_flv_probe:
clr.l d0
rts
.even
-O2 -fno-cse-follow-jumps (works OK):
_flv_probe:
move.l 4(sp),a0
move.l 4(a0),a0
cmp.b #70,(a0)
jeq L10
L7:
clr.l d0
rts
L10:
cmp.b #76,1(a0)
jne L7
cmp.b #86,2(a0)
jne L7
cmp.b #4,3(a0)
jhi L7
tst.b 5(a0)
jne L7
move.l 5(a0),d0
moveq #8,d1
cmp.l d0,d1
jcc L7
moveq #100,d0
rts
.even
--
ami_stuff at o2 dot pl changed:
What |Removed |Added
----------------------------------------------------------------------------
Severity|normal |major
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42522
^ permalink raw reply [flat|nested] 17+ messages in thread
* [Bug c/42522] [m68k] Wrong code generated with -O2/-O3
2009-12-28 20:15 [Bug c/42522] New: [m68k] Wrong code generated with -O2/-O3 ami_stuff at o2 dot pl
` (4 preceding siblings ...)
2009-12-28 23:38 ` ami_stuff at o2 dot pl
@ 2009-12-29 1:20 ` ami_stuff at o2 dot pl
2009-12-29 11:58 ` schwab at linux-m68k dot org
` (9 subsequent siblings)
15 siblings, 0 replies; 17+ messages in thread
From: ami_stuff at o2 dot pl @ 2009-12-29 1:20 UTC (permalink / raw)
To: gcc-bugs
------- Comment #6 from ami_stuff at o2 dot pl 2009-12-29 01:20 -------
> Works for me with 4.5.0 20091228.
How's that possible? What about GCC 4.4 branch? I just checked with ATARI GCC
4.4.2 m68k compiler and got the same result:
/usr/local/cross-mint/bin/m68k-atari-mint-gcc -c -S flvdec_O2.i -m68060 -O2:
_flv_probe:
link.w %fp,#0
clr.l %d0
unlk %fp
rts
.even
/usr/local/cross-mint/bin/m68k-atari-mint-gcc -c -S flvdec_O2.i -m68060 -O2
-fno-cse-follow-jumps
_flv_probe:
link.w %fp,#0
move.l 8(%fp),%a0
move.l 4(%a0),%a0
cmp.b #70,(%a0)
jeq .L6
.L2:
clr.l %d0
unlk %fp
rts
.L6:
cmp.b #76,1(%a0)
jne .L2
cmp.b #86,2(%a0)
jne .L2
cmp.b #4,3(%a0)
jhi .L2
tst.b 5(%a0)
jne .L2
move.l 5(%a0),%d0
moveq #8,%d1
cmp.l %d0,%d1
jcc .L2
moveq #100,%d0
unlk %fp
rts
.even
$ /usr/local/cross-mint/bin/m68k-atari-mint-gcc -v
Using built-in specs.
Target: m68k-atari-mint
Configured with: ../gcc-4.4.2-mint-20091017/configure --target=m68k-atari-mint
-
-prefix=/usr/local/cross-mint --enable-languages=c,c++ --disable-nls
--disable-l
ibstdcxx-pch --mandir='/man' --infodir='/info'
Thread model: single
gcc version 4.4.2 (MiNT 20091017) (GCC)
http://vincent.riviere.free.fr/soft/m68k-atari-mint/
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42522
^ permalink raw reply [flat|nested] 17+ messages in thread
* [Bug c/42522] [m68k] Wrong code generated with -O2/-O3
2009-12-28 20:15 [Bug c/42522] New: [m68k] Wrong code generated with -O2/-O3 ami_stuff at o2 dot pl
` (5 preceding siblings ...)
2009-12-29 1:20 ` ami_stuff at o2 dot pl
@ 2009-12-29 11:58 ` schwab at linux-m68k dot org
2009-12-29 18:52 ` nospamname at web dot de
` (8 subsequent siblings)
15 siblings, 0 replies; 17+ messages in thread
From: schwab at linux-m68k dot org @ 2009-12-29 11:58 UTC (permalink / raw)
To: gcc-bugs
------- Comment #7 from schwab at linux-m68k dot org 2009-12-29 11:58 -------
Please report that to the provider of your inofficial builds. Neither
m68k-amigaos nor m68k-atari-mint are supported by the official sources.
--
schwab at linux-m68k dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Severity|major |normal
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42522
^ permalink raw reply [flat|nested] 17+ messages in thread
* [Bug c/42522] [m68k] Wrong code generated with -O2/-O3
2009-12-28 20:15 [Bug c/42522] New: [m68k] Wrong code generated with -O2/-O3 ami_stuff at o2 dot pl
` (6 preceding siblings ...)
2009-12-29 11:58 ` schwab at linux-m68k dot org
@ 2009-12-29 18:52 ` nospamname at web dot de
2009-12-31 13:35 ` nospamname at web dot de
` (7 subsequent siblings)
15 siblings, 0 replies; 17+ messages in thread
From: nospamname at web dot de @ 2009-12-29 18:52 UTC (permalink / raw)
To: gcc-bugs
------- Comment #8 from nospamname at web dot de 2009-12-29 18:52 -------
I have now find out with cflag -m68000 work with -O3.
But it work not with -m68020 or -m68040 or -m68060
Here is a standalone testcode and output with -S
-----
struct test{
long dummy;
unsigned long buf;
};
struct unaligned_32 { unsigned long l; } __attribute__((packed));
static int flv_probe(struct test *p)
{
const unsigned char *d;
d = p->buf;
if (d[0] == 'F' && d[1] == 'L' && d[2] == 'V' && d[3] < 5 && d[5]==0 &&
(((const struct unaligned_32 *) (d+5))->l)>8) {
return 100;
}
return 0;
}
int main(int argc, char **argv)
{
printf("%ld\n",flv_probe(argc));
}
----------------------
Mit dem 4.5.0 vom 24.12 bekomme ich mit -O3 den Outpout .Code geht nicht.
(CFLAGS -m68060 -S -O3)
#NO_APP
.text
LC0:
.ascii "%ld\12\0"
.even
.globl _main
_main:
link.w a5,#0
jsr ___main
clr.l 12(a5)
move.l #LC0,8(a5)
unlk a5
jra _printf
----------------------------------------------
(CFLAGS -m68060 -S -O1)
#NO_APP
.text
LC0:
.ascii "%ld\12\0"
.even
.globl _main
_main:
link.w a5,#0
jsr ___main
move.l 8(a5),a0
move.l 4(a0),a0
cmp.b #70,(a0)
jne L3
cmp.b #76,1(a0)
jne L4
cmp.b #86,2(a0)
jne L5
cmp.b #4,3(a0)
jhi L6
tst.b 5(a0)
jne L7
move.l 5(a0),d0
moveq #8,d1
cmp.l d0,d1
jcs L8
clr.l d0
jra L2
L3:
clr.l d0
jra L2
L4:
clr.l d0
jra L2
L5:
clr.l d0
jra L2
L6:
clr.l d0
jra L2
L7:
clr.l d0
jra L2
L8:
moveq #100,d0
L2:
move.l d0,-(sp)
pea LC0
jsr _printf
addq.l #8,sp
unlk a5
rts
#NO_APP
.text
LC0:
.ascii "%ld\12\0"
.even
.globl _main
_main:
link.w a5,#0
move.l a2,-(sp)
move.l 8(a5),a2
jsr ___main
move.l 4(a2),a0
cmp.b #70,(a0)
jeq L10
L7:
moveq #0,d0
move.l d0,12(a5)
move.l #LC0,8(a5)
move.l -4(a5),a2
unlk a5
jra _printf
L10:
cmp.b #76,1(a0)
jne L7
cmp.b #86,2(a0)
jne L7
cmp.b #4,3(a0)
jhi L7
tst.b 5(a0)
jne L7
moveq #0,d1
move.b 6(a0),d1
swap d1
clr.w d1
moveq #0,d0
move.b 7(a0),d0
lsl.l #8,d0
or.l d1,d0
or.b 8(a0),d0
moveq #8,d1
cmp.l d0,d1
jcc L7
moveq #100,d0
move.l d0,12(a5)
move.l #LC0,8(a5)
move.l -4(a5),a2
unlk a5
jra _printf
------------------------------------------------
(CFLAGS -m68000 -S -O3)
#NO_APP
.text
LC0:
.ascii "%ld\12\0"
.even
.globl _main
_main:
link.w a5,#0
move.l a2,-(sp)
move.l 8(a5),a2
jsr ___main
move.l 4(a2),a0
cmp.b #70,(a0)
jeq L10
L7:
moveq #0,d0
move.l d0,12(a5)
move.l #LC0,8(a5)
move.l -4(a5),a2
unlk a5
jra _printf
L10:
cmp.b #76,1(a0)
jne L7
cmp.b #86,2(a0)
jne L7
cmp.b #4,3(a0)
jhi L7
tst.b 5(a0)
jne L7
moveq #0,d1
move.b 6(a0),d1
swap d1
clr.w d1
moveq #0,d0
move.b 7(a0),d0
lsl.l #8,d0
or.l d1,d0
or.b 8(a0),d0
moveq #8,d1
cmp.l d0,d1
jcc L7
moveq #100,d0
move.l d0,12(a5)
move.l #LC0,8(a5)
move.l -4(a5),a2
unlk a5
jra _printf
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42522
^ permalink raw reply [flat|nested] 17+ messages in thread
* [Bug c/42522] [m68k] Wrong code generated with -O2/-O3
2009-12-28 20:15 [Bug c/42522] New: [m68k] Wrong code generated with -O2/-O3 ami_stuff at o2 dot pl
` (7 preceding siblings ...)
2009-12-29 18:52 ` nospamname at web dot de
@ 2009-12-31 13:35 ` nospamname at web dot de
2009-12-31 17:01 ` mikpe at it dot uu dot se
` (6 subsequent siblings)
15 siblings, 0 replies; 17+ messages in thread
From: nospamname at web dot de @ 2009-12-31 13:35 UTC (permalink / raw)
To: gcc-bugs
------- Comment #9 from nospamname at web dot de 2009-12-31 13:35 -------
I compile now with a m68k-elf Compiler and do the small testcode i post
above.The Problem is same on m68k-elf Compiler too.
other CPU as -m68000 fail with -O3 or -O2
So can this Report Reopen and maybe another can check please ?
Andreas have not write with what CPU Setting he get the WORKSFORME Result.
Here is the Output
m68k-elf-gcc.exe -c wb2.c -o "Default Profile/wb2.o"
-I"E:/amiga/AmiDevCpp/bernd/clib2/" -m68020-60 -v -S -O3
Using built-in specs.
COLLECT_GCC=/usr/local/amiga/bin/m68k-elf-gcc
COLLECT_LTO_WRAPPER=/usr/local/amiga/bin/../libexec/gcc/m68k-elf/4.5.0/lto-wrapper.exe
Target: m68k-elf
Configured with: /bernd/gcc4/configure --target=m68k-elf
Thread model: single
gcc version 4.5.0 20091224 (experimental) (GCC)
COLLECT_GCC_OPTIONS='-c' '-o' 'Default Profile/wb2.o'
'-IE:/amiga/AmiDevCpp/bernd/clib2/' '-m68020-60' '-v' '-S' '-O3'
...
GNU C (GCC) version 4.5.0 20091224 (experimental) (m68k-elf)
compiled by GNU C version 4.3.4 20090804 (release) 1, GMP version
4.2.3, MPFR
and teh Result of -S is this
#NO_APP
.file "wb2.c"
.section .rodata
.LC0:
.string "%ld\n"
.text
.align 2
.globl main
.type main, @function
main:
move.l %fp,-(%sp)
move.l %sp,%fp
clr.l 12(%fp)
move.l #.LC0,8(%fp)
unlk %fp
jra printf
.size main, .-main
.ident "GCC: (GNU) 4.5.0 20091224 (experimental)"
---------------------------
COLLECT_GCC_OPTIONS='-c' '-o' 'Default Profile/wb2.o'
'-IE:/amiga/AmiDevCpp/bernd/clib2/' '-m68000' '-v' '-S' '-O3'
with CPU m68000 or -O1 or -O0 this work ok.
#NO_APP
.file "wb2.c"
.section .rodata
.LC0:
.string "%ld\n"
.text
.align 2
.globl main
.type main, @function
main:
link.w %fp,#0
move.l 8(%fp),%a0
move.l 4(%a0),%a0
cmp.b #70,(%a0)
jeq .L10
.L7:
moveq #0,%d0
move.l %d0,12(%fp)
move.l #.LC0,8(%fp)
unlk %fp
jra printf
.L10:
cmp.b #76,1(%a0)
jne .L7
cmp.b #86,2(%a0)
jne .L7
cmp.b #4,3(%a0)
jhi .L7
tst.b 5(%a0)
jne .L7
moveq #0,%d1
move.b 6(%a0),%d1
swap %d1
clr.w %d1
moveq #0,%d0
move.b 7(%a0),%d0
lsl.l #8,%d0
or.l %d1,%d0
or.b 8(%a0),%d0
moveq #8,%d1
cmp.l %d0,%d1
jcc .L7
moveq #100,%d0
move.l %d0,12(%fp)
move.l #.LC0,8(%fp)
unlk %fp
jra printf
.size main, .-main
.ident "GCC: (GNU) 4.5.0 20091224 (experimental)"
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42522
^ permalink raw reply [flat|nested] 17+ messages in thread
* [Bug c/42522] [m68k] Wrong code generated with -O2/-O3
2009-12-28 20:15 [Bug c/42522] New: [m68k] Wrong code generated with -O2/-O3 ami_stuff at o2 dot pl
` (8 preceding siblings ...)
2009-12-31 13:35 ` nospamname at web dot de
@ 2009-12-31 17:01 ` mikpe at it dot uu dot se
2009-12-31 17:06 ` [Bug target/42522] " jsm28 at gcc dot gnu dot org
` (5 subsequent siblings)
15 siblings, 0 replies; 17+ messages in thread
From: mikpe at it dot uu dot se @ 2009-12-31 17:01 UTC (permalink / raw)
To: gcc-bugs
------- Comment #10 from mikpe at it dot uu dot se 2009-12-31 17:01 -------
Created an attachment (id=19431)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=19431&action=view)
simpler test case
I'm attaching a reduced test case that triggers wrong-code for m68k-elf with
gcc-4.5-20091224, every 4.x release, and 3.4.6 (didn't check older releases).
To trigger, compile with -O2 (or higher) and -m68020 (or higher), and observe
how bar() skips all tests and just returns zero.
Any of the following actions mask the bug:
1. reduce optimization level to -O1
2. reduce target cpu type to -m68010 or -m68000
3. remove the "__attribute__((packed))" from "union foo"
4. in bar(), replace "p->d[0]" with "p->d[1]" so that the first and second
memory accesses don't have the same base address
-fno-strict-aliasing makes no difference
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42522
^ permalink raw reply [flat|nested] 17+ messages in thread
* [Bug target/42522] [m68k] Wrong code generated with -O2/-O3
2009-12-28 20:15 [Bug c/42522] New: [m68k] Wrong code generated with -O2/-O3 ami_stuff at o2 dot pl
` (9 preceding siblings ...)
2009-12-31 17:01 ` mikpe at it dot uu dot se
@ 2009-12-31 17:06 ` jsm28 at gcc dot gnu dot org
2009-12-31 18:04 ` nospamname at web dot de
` (4 subsequent siblings)
15 siblings, 0 replies; 17+ messages in thread
From: jsm28 at gcc dot gnu dot org @ 2009-12-31 17:06 UTC (permalink / raw)
To: gcc-bugs
------- Comment #11 from jsm28 at gcc dot gnu dot org 2009-12-31 17:06 -------
Reopening for now. Please leave the Component as "target"; that is
a much more likely place for the bug than the C front end.
--
jsm28 at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |UNCONFIRMED
Component|c |target
Resolution|WORKSFORME |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42522
^ permalink raw reply [flat|nested] 17+ messages in thread
* [Bug target/42522] [m68k] Wrong code generated with -O2/-O3
2009-12-28 20:15 [Bug c/42522] New: [m68k] Wrong code generated with -O2/-O3 ami_stuff at o2 dot pl
` (10 preceding siblings ...)
2009-12-31 17:06 ` [Bug target/42522] " jsm28 at gcc dot gnu dot org
@ 2009-12-31 18:04 ` nospamname at web dot de
2010-01-17 22:27 ` [Bug rtl-optimization/42522] (zero_extract:SI (mem:QI) ...) misoptimized schwab at linux-m68k dot org
` (3 subsequent siblings)
15 siblings, 0 replies; 17+ messages in thread
From: nospamname at web dot de @ 2009-12-31 18:04 UTC (permalink / raw)
To: gcc-bugs
------- Comment #12 from nospamname at web dot de 2009-12-31 18:04 -------
>3.4.6 (didn't check older releases).
I test now 3.4.0 for m68k-amigaos.The Problem is here too.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42522
^ permalink raw reply [flat|nested] 17+ messages in thread
* [Bug rtl-optimization/42522] (zero_extract:SI (mem:QI) ...) misoptimized
2009-12-28 20:15 [Bug c/42522] New: [m68k] Wrong code generated with -O2/-O3 ami_stuff at o2 dot pl
` (11 preceding siblings ...)
2009-12-31 18:04 ` nospamname at web dot de
@ 2010-01-17 22:27 ` schwab at linux-m68k dot org
2010-01-17 22:35 ` schwab at linux-m68k dot org
` (2 subsequent siblings)
15 siblings, 0 replies; 17+ messages in thread
From: schwab at linux-m68k dot org @ 2010-01-17 22:27 UTC (permalink / raw)
To: gcc-bugs
------- Comment #13 from schwab at linux-m68k dot org 2010-01-17 22:27 -------
The bug exists since the dawn of time. The problem is that cse thinks that
(zero_extract:SI (mem:QI ...) ...) is zero if (mem:QI ...) is known to be zero,
but the first argument of zero_extract is only a base address if it is a memory
address. On m68k this is only generated when STRICT_ALIGNMENT, and the bug was
hidden until e2496245b8453f49bb4428f281af7686be09ddf8:
2000-07-17 Zack Weinberg <zack@wolery.cumb.org>
(simplify_ternary_operation): Do not examine MODE_BITSIZE of
a CONST_INT, it will always be zero.
--
schwab at linux-m68k dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Component|target |rtl-optimization
Ever Confirmed|0 |1
GCC target triplet|m68k-*-* |m68k-*-elf
Last reconfirmed|0000-00-00 00:00:00 |2010-01-17 22:27:47
date| |
Summary|[m68k] Wrong code generated |(zero_extract:SI (mem:QI)
|with -O2/-O3 |...) misoptimized
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42522
^ permalink raw reply [flat|nested] 17+ messages in thread
* [Bug rtl-optimization/42522] (zero_extract:SI (mem:QI) ...) misoptimized
2009-12-28 20:15 [Bug c/42522] New: [m68k] Wrong code generated with -O2/-O3 ami_stuff at o2 dot pl
` (12 preceding siblings ...)
2010-01-17 22:27 ` [Bug rtl-optimization/42522] (zero_extract:SI (mem:QI) ...) misoptimized schwab at linux-m68k dot org
@ 2010-01-17 22:35 ` schwab at linux-m68k dot org
2010-01-18 10:26 ` rguenth at gcc dot gnu dot org
2010-05-09 13:54 ` ami_stuff at o2 dot pl
15 siblings, 0 replies; 17+ messages in thread
From: schwab at linux-m68k dot org @ 2010-01-17 22:35 UTC (permalink / raw)
To: gcc-bugs
--
schwab at linux-m68k dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to fail| |4.3.4 4.4.3
Target Milestone|--- |4.4.4
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42522
^ permalink raw reply [flat|nested] 17+ messages in thread
* [Bug rtl-optimization/42522] (zero_extract:SI (mem:QI) ...) misoptimized
2009-12-28 20:15 [Bug c/42522] New: [m68k] Wrong code generated with -O2/-O3 ami_stuff at o2 dot pl
` (13 preceding siblings ...)
2010-01-17 22:35 ` schwab at linux-m68k dot org
@ 2010-01-18 10:26 ` rguenth at gcc dot gnu dot org
2010-05-09 13:54 ` ami_stuff at o2 dot pl
15 siblings, 0 replies; 17+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2010-01-18 10:26 UTC (permalink / raw)
To: gcc-bugs
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |wrong-code
Known to fail|4.3.4 4.4.3 |4.3.4 4.4.3 4.5.0
Target Milestone|4.4.4 |---
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42522
^ permalink raw reply [flat|nested] 17+ messages in thread
* [Bug rtl-optimization/42522] (zero_extract:SI (mem:QI) ...) misoptimized
2009-12-28 20:15 [Bug c/42522] New: [m68k] Wrong code generated with -O2/-O3 ami_stuff at o2 dot pl
` (14 preceding siblings ...)
2010-01-18 10:26 ` rguenth at gcc dot gnu dot org
@ 2010-05-09 13:54 ` ami_stuff at o2 dot pl
15 siblings, 0 replies; 17+ messages in thread
From: ami_stuff at o2 dot pl @ 2010-05-09 13:54 UTC (permalink / raw)
To: gcc-bugs
------- Comment #14 from ami_stuff at o2 dot pl 2010-05-09 13:54 -------
Any chance to see this bug fixed in the near future?
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42522
^ permalink raw reply [flat|nested] 17+ messages in thread
end of thread, other threads:[~2010-05-09 13:54 UTC | newest]
Thread overview: 17+ messages (download: mbox.gz / follow: Atom feed)
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2009-12-28 20:15 [Bug c/42522] New: [m68k] Wrong code generated with -O2/-O3 ami_stuff at o2 dot pl
2009-12-28 20:18 ` [Bug c/42522] " ami_stuff at o2 dot pl
2009-12-28 20:23 ` [Bug target/42522] " pinskia at gcc dot gnu dot org
2009-12-28 20:39 ` [Bug c/42522] " ami_stuff at o2 dot pl
2009-12-28 23:31 ` schwab at linux-m68k dot org
2009-12-28 23:38 ` ami_stuff at o2 dot pl
2009-12-29 1:20 ` ami_stuff at o2 dot pl
2009-12-29 11:58 ` schwab at linux-m68k dot org
2009-12-29 18:52 ` nospamname at web dot de
2009-12-31 13:35 ` nospamname at web dot de
2009-12-31 17:01 ` mikpe at it dot uu dot se
2009-12-31 17:06 ` [Bug target/42522] " jsm28 at gcc dot gnu dot org
2009-12-31 18:04 ` nospamname at web dot de
2010-01-17 22:27 ` [Bug rtl-optimization/42522] (zero_extract:SI (mem:QI) ...) misoptimized schwab at linux-m68k dot org
2010-01-17 22:35 ` schwab at linux-m68k dot org
2010-01-18 10:26 ` rguenth at gcc dot gnu dot org
2010-05-09 13:54 ` ami_stuff at o2 dot pl
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