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* [Bug c/24361] New: Optimizations -fcse-follow-jumps -fforce-mem break code
@ 2005-10-14 11:03 tromp at cwi dot nl
2005-10-14 13:07 ` [Bug rtl-optimization/24361] [4.0 regression] " pinskia at gcc dot gnu dot org
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: tromp at cwi dot nl @ 2005-10-14 11:03 UTC (permalink / raw)
To: gcc-bugs
-bash-3.00$ gcc -v
Using built-in specs.
Target: i386-redhat-linux
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man
--infodir=/usr/share/info --enable-shared --enable-threads=posix
--enable-checking=release --with-system-zlib --enable-__cxa_atexit
--disable-libunwind-exceptions --enable-libgcj-multifile
--enable-languages=c,c++,objc,java,f95,ada --enable-java-awt=gtk
--with-java-home=/usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/jre
--host=i386-redhat-linux
Thread model: posix
gcc version 4.0.1 20050727 (Red Hat 4.0.1-5)
The program below produces incorrect results with -O2 and higher, which
I've deduced is due to the combined options -fcse-follow-jumps -fforce-mem
#include <stdlib.h>
#include <stdio.h>
typedef unsigned long Word_t;
typedef struct {
unsigned char type;
unsigned char color;
unsigned char left;
unsigned char right;
} cell;
//possible cell types
#define WIDTH 3
typedef cell bstate[WIDTH]; // borderstate
void wordtostate(Word_t s, int bump, bstate state)
{
char stack[WIDTH];
int sp,i,type,leftcolor=0;
cell *sti;
for (sti = &state[i = sp = 0]; i < WIDTH; sti++, i++) {
sti->type = type = (s >> (3*i)) & 7;
sti->left = sti->right = i;
sti->color = leftcolor ^ 1; // assume opposite color
if (type & 2) {
sti->right = state[sti->left = stack[--sp]].right;
state[sti->left].right = state[sti->right].left = i;
sti->color ^= (sti->left == i-1); // check color assumption
}
if (type & 1)
stack[sp++] = i;
leftcolor = sti->color;
}
}
int main()
{
bstate state;
Word_t s = 0675;
wordtostate(s, 0, state);
printf("%s\n", state[1].color ? "OK" : "BUG");
return 0;
}
--
Summary: Optimizations -fcse-follow-jumps -fforce-mem break code
Product: gcc
Version: 4.0.1
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: tromp at cwi dot nl
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24361
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug rtl-optimization/24361] [4.0 regression] Optimizations -fcse-follow-jumps -fforce-mem break code
2005-10-14 11:03 [Bug c/24361] New: Optimizations -fcse-follow-jumps -fforce-mem break code tromp at cwi dot nl
@ 2005-10-14 13:07 ` pinskia at gcc dot gnu dot org
2005-10-15 17:54 ` pinskia at gcc dot gnu dot org
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-10-14 13:07 UTC (permalink / raw)
To: gcc-bugs
------- Comment #1 from pinskia at gcc dot gnu dot org 2005-10-14 13:07 -------
I think this has been fixed in 4.0.3 by the patch for PR 23324 but I need
someone to test.
--
pinskia at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
GCC target triplet| |i686-pc-linux-gnu
Keywords| |wrong-code
Summary|Optimizations -fcse-follow- |[4.0 regression]
|jumps -fforce-mem break code|Optimizations -fcse-follow-
| |jumps -fforce-mem break code
Target Milestone|--- |4.0.3
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24361
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug rtl-optimization/24361] [4.0 regression] Optimizations -fcse-follow-jumps -fforce-mem break code
2005-10-14 11:03 [Bug c/24361] New: Optimizations -fcse-follow-jumps -fforce-mem break code tromp at cwi dot nl
2005-10-14 13:07 ` [Bug rtl-optimization/24361] [4.0 regression] " pinskia at gcc dot gnu dot org
@ 2005-10-15 17:54 ` pinskia at gcc dot gnu dot org
2006-03-11 3:18 ` mmitchel at gcc dot gnu dot org
2007-02-03 15:46 ` gdr at gcc dot gnu dot org
3 siblings, 0 replies; 5+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-10-15 17:54 UTC (permalink / raw)
To: gcc-bugs
------- Comment #2 from pinskia at gcc dot gnu dot org 2005-10-15 17:54 -------
Confirmed, still fails on the 4.0 branch.
--
pinskia at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever Confirmed|0 |1
Known to fail| |4.0.3
Known to work| |4.1.0
Last reconfirmed|0000-00-00 00:00:00 |2005-10-15 17:54:19
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24361
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug rtl-optimization/24361] [4.0 regression] Optimizations -fcse-follow-jumps -fforce-mem break code
2005-10-14 11:03 [Bug c/24361] New: Optimizations -fcse-follow-jumps -fforce-mem break code tromp at cwi dot nl
2005-10-14 13:07 ` [Bug rtl-optimization/24361] [4.0 regression] " pinskia at gcc dot gnu dot org
2005-10-15 17:54 ` pinskia at gcc dot gnu dot org
@ 2006-03-11 3:18 ` mmitchel at gcc dot gnu dot org
2007-02-03 15:46 ` gdr at gcc dot gnu dot org
3 siblings, 0 replies; 5+ messages in thread
From: mmitchel at gcc dot gnu dot org @ 2006-03-11 3:18 UTC (permalink / raw)
To: gcc-bugs
--
mmitchel at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|4.0.3 |4.0.4
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24361
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug rtl-optimization/24361] [4.0 regression] Optimizations -fcse-follow-jumps -fforce-mem break code
2005-10-14 11:03 [Bug c/24361] New: Optimizations -fcse-follow-jumps -fforce-mem break code tromp at cwi dot nl
` (2 preceding siblings ...)
2006-03-11 3:18 ` mmitchel at gcc dot gnu dot org
@ 2007-02-03 15:46 ` gdr at gcc dot gnu dot org
3 siblings, 0 replies; 5+ messages in thread
From: gdr at gcc dot gnu dot org @ 2007-02-03 15:46 UTC (permalink / raw)
To: gcc-bugs
------- Comment #3 from gdr at gcc dot gnu dot org 2007-02-03 15:46 -------
Fixed in GCC-4.1.1 and higher.
--
gdr at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
Target Milestone|4.0.4 |4.1.1
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24361
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2007-02-03 15:46 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
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2005-10-14 11:03 [Bug c/24361] New: Optimizations -fcse-follow-jumps -fforce-mem break code tromp at cwi dot nl
2005-10-14 13:07 ` [Bug rtl-optimization/24361] [4.0 regression] " pinskia at gcc dot gnu dot org
2005-10-15 17:54 ` pinskia at gcc dot gnu dot org
2006-03-11 3:18 ` mmitchel at gcc dot gnu dot org
2007-02-03 15:46 ` gdr at gcc dot gnu dot org
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