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* [Bug rtl-optimization/110391] New: wrong code at -O2 and -O3 with "on x86_64-linux-gnu
@ 2023-06-24 13:17 zhendong.su at inf dot ethz.ch
2023-06-24 13:20 ` [Bug rtl-optimization/110391] wrong code at -O2 and -O3 with "-fsel-sched-pipelining -fselective-scheduling2" on x86_64-linux-gnu zhendong.su at inf dot ethz.ch
` (5 more replies)
0 siblings, 6 replies; 7+ messages in thread
From: zhendong.su at inf dot ethz.ch @ 2023-06-24 13:17 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110391
Bug ID: 110391
Summary: wrong code at -O2 and -O3 with "on x86_64-linux-gnu
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: zhendong.su at inf dot ethz.ch
Target Milestone: ---
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug rtl-optimization/110391] wrong code at -O2 and -O3 with "-fsel-sched-pipelining -fselective-scheduling2" on x86_64-linux-gnu
2023-06-24 13:17 [Bug rtl-optimization/110391] New: wrong code at -O2 and -O3 with "on x86_64-linux-gnu zhendong.su at inf dot ethz.ch
@ 2023-06-24 13:20 ` zhendong.su at inf dot ethz.ch
2023-06-24 15:23 ` [Bug rtl-optimization/110391] [12/13/14 Regression] " pinskia at gcc dot gnu.org
` (4 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: zhendong.su at inf dot ethz.ch @ 2023-06-24 13:20 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110391
Zhendong Su <zhendong.su at inf dot ethz.ch> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|wrong code at -O2 and -O3 |wrong code at -O2 and -O3
|with "on x86_64-linux-gnu |with
| |"-fsel-sched-pipelining
| |-fselective-scheduling2" on
| |x86_64-linux-gnu
--- Comment #1 from Zhendong Su <zhendong.su at inf dot ethz.ch> ---
It appears to be a regression from 11.*, and affects 12.* and later.
Compiler Explorer: https://godbolt.org/z/WEhzh66Pz
[571] % gcctk -v
Using built-in specs.
COLLECT_GCC=gcctk
COLLECT_LTO_WRAPPER=/local/home/suz/suz-local/software/local/gcc-trunk/bin/../libexec/gcc/x86_64-pc-linux-gnu/14.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-trunk/configure --disable-bootstrap
--enable-checking=yes --prefix=/local/suz-local/software/local/gcc-trunk
--enable-sanitizers --enable-languages=c,c++ --disable-werror
--disable-multilib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 14.0.0 20230623 (experimental) [master r14-924-gd709841ae0f] (GCC)
[572] %
[572] % gcctk -O3 -fsel-sched-pipelining -fselective-scheduling2 -fPIC small.c
[573] % ./a.out
Floating point exception
[574] %
[574] % gcctk -O3 small.c; ./a.out
[575] %
[575] % cat small.c
int printf(const char *, ...);
int a, d, b, i = 2, e;
static unsigned c = 1;
char f, g = 1;
void j() {
k:
if (b)
for (;;)
__builtin_abort();
unsigned l = i && 2 / c * d % g;
if (a) {
l = c;
g = i;
if (d > 1) {
printf("%d", c);
goto k;
}
}
a = c = l;
}
int main() {
a = -2;
j();
i = 0;
f = ~c;
if (f > 0) {
printf("%d", f);
a = 2 % i;
}
return 0;
}
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug rtl-optimization/110391] [12/13/14 Regression] wrong code at -O2 and -O3 with "-fsel-sched-pipelining -fselective-scheduling2" on x86_64-linux-gnu
2023-06-24 13:17 [Bug rtl-optimization/110391] New: wrong code at -O2 and -O3 with "on x86_64-linux-gnu zhendong.su at inf dot ethz.ch
2023-06-24 13:20 ` [Bug rtl-optimization/110391] wrong code at -O2 and -O3 with "-fsel-sched-pipelining -fselective-scheduling2" on x86_64-linux-gnu zhendong.su at inf dot ethz.ch
@ 2023-06-24 15:23 ` pinskia at gcc dot gnu.org
2023-06-26 9:12 ` zhendong.su at inf dot ethz.ch
` (3 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: pinskia at gcc dot gnu.org @ 2023-06-24 15:23 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110391
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|wrong code at -O2 and -O3 |[12/13/14 Regression] wrong
|with |code at -O2 and -O3 with
|"-fsel-sched-pipelining |"-fsel-sched-pipelining
|-fselective-scheduling2" on |-fselective-scheduling2" on
|x86_64-linux-gnu |x86_64-linux-gnu
Version|unknown |14.0
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=95123
Target Milestone|--- |12.4
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug rtl-optimization/110391] [12/13/14 Regression] wrong code at -O2 and -O3 with "-fsel-sched-pipelining -fselective-scheduling2" on x86_64-linux-gnu
2023-06-24 13:17 [Bug rtl-optimization/110391] New: wrong code at -O2 and -O3 with "on x86_64-linux-gnu zhendong.su at inf dot ethz.ch
2023-06-24 13:20 ` [Bug rtl-optimization/110391] wrong code at -O2 and -O3 with "-fsel-sched-pipelining -fselective-scheduling2" on x86_64-linux-gnu zhendong.su at inf dot ethz.ch
2023-06-24 15:23 ` [Bug rtl-optimization/110391] [12/13/14 Regression] " pinskia at gcc dot gnu.org
@ 2023-06-26 9:12 ` zhendong.su at inf dot ethz.ch
2023-06-29 9:18 ` zhendong.su at inf dot ethz.ch
` (2 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: zhendong.su at inf dot ethz.ch @ 2023-06-26 9:12 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110391
--- Comment #2 from Zhendong Su <zhendong.su at inf dot ethz.ch> ---
A likely related reproducer that affects 10.* and later.
Compiler Explorer: https://godbolt.org/z/KP6PnTKPj
[579] % gcctk -v
Using built-in specs.
COLLECT_GCC=gcctk
COLLECT_LTO_WRAPPER=/local/home/suz/suz-local/software/local/gcc-trunk/bin/../libexec/gcc/x86_64-pc-linux-gnu/14.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-trunk/configure --disable-bootstrap
--enable-checking=yes --prefix=/local/suz-local/software/local/gcc-trunk
--enable-sanitizers --enable-languages=c,c++ --disable-werror
--disable-multilib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 14.0.0 20230625 (experimental) [master r14-924-gd709841ae0f] (GCC)
[580] %
[580] % gcctk -O2 -fsel-sched-pipelining -fschedule-insns
-fselective-scheduling2 small.c
[581] % ./a.out
Floating point exception
[582] %
[582] % gcctk -O2 small.c; ./a.out
[583] %
[583] % cat small.c
int printf(const char *, ...);
int a, d, e = -2;
char b;
long c = -2;
int main() {
int g, h;
d = e;
g = c;
L:
h = d;
c = 1;
d = c % ~e;
e = e >> ~g;
if (e > b)
printf("%ld", c);
if (g > c)
printf("%d", a);
if (b)
goto L;
e = h;
return 0;
}
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug rtl-optimization/110391] [12/13/14 Regression] wrong code at -O2 and -O3 with "-fsel-sched-pipelining -fselective-scheduling2" on x86_64-linux-gnu
2023-06-24 13:17 [Bug rtl-optimization/110391] New: wrong code at -O2 and -O3 with "on x86_64-linux-gnu zhendong.su at inf dot ethz.ch
` (2 preceding siblings ...)
2023-06-26 9:12 ` zhendong.su at inf dot ethz.ch
@ 2023-06-29 9:18 ` zhendong.su at inf dot ethz.ch
2023-06-29 17:33 ` zhendong.su at inf dot ethz.ch
2024-03-04 1:49 ` law at gcc dot gnu.org
5 siblings, 0 replies; 7+ messages in thread
From: zhendong.su at inf dot ethz.ch @ 2023-06-29 9:18 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110391
--- Comment #3 from Zhendong Su <zhendong.su at inf dot ethz.ch> ---
Another related reproducer.
Compiler Explorer: https://godbolt.org/z/E8GPcfPY5
[543] % gcctk -v
Using built-in specs.
COLLECT_GCC=gcctk
COLLECT_LTO_WRAPPER=/local/home/suz/suz-local/software/local/gcc-trunk/bin/../libexec/gcc/x86_64-pc-linux-gnu/14.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-trunk/configure --disable-bootstrap
--enable-checking=yes --prefix=/local/suz-local/software/local/gcc-trunk
--enable-sanitizers --enable-languages=c,c++ --disable-werror
--disable-multilib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 14.0.0 20230629 (experimental) [master r14-924-gd709841ae0f] (GCC)
[544] %
[544] % gcctk -O2 -fselective-scheduling2 small.c
[545] % timeout -s 9 5 ./a.out
Killed
[546] %
[546] % gcctk -O1 small.c; ./a.out
[547] %
[547] % cat small.c
int printf(const char *, ...);
int a = -1, b = 1, *c = &a;
int main() {
*c |= 1;
if (a) {
L:
if (a < -1)
printf("%d", 0);
if (!b) {
printf("%d", 1);
goto L;
}
if (a > 0)
goto L;
b = 0;
}
return 0;
}
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug rtl-optimization/110391] [12/13/14 Regression] wrong code at -O2 and -O3 with "-fsel-sched-pipelining -fselective-scheduling2" on x86_64-linux-gnu
2023-06-24 13:17 [Bug rtl-optimization/110391] New: wrong code at -O2 and -O3 with "on x86_64-linux-gnu zhendong.su at inf dot ethz.ch
` (3 preceding siblings ...)
2023-06-29 9:18 ` zhendong.su at inf dot ethz.ch
@ 2023-06-29 17:33 ` zhendong.su at inf dot ethz.ch
2024-03-04 1:49 ` law at gcc dot gnu.org
5 siblings, 0 replies; 7+ messages in thread
From: zhendong.su at inf dot ethz.ch @ 2023-06-29 17:33 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110391
--- Comment #4 from Zhendong Su <zhendong.su at inf dot ethz.ch> ---
Another likely related reproducer that affects 9.* and later.
Compiler Explorer: https://godbolt.org/z/8vTd7rx6d
[641] % gcctk -v
Using built-in specs.
COLLECT_GCC=gcctk
COLLECT_LTO_WRAPPER=/local/home/suz/suz-local/software/local/gcc-trunk/bin/../libexec/gcc/x86_64-pc-linux-gnu/14.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-trunk/configure --disable-bootstrap
--enable-checking=yes --prefix=/local/suz-local/software/local/gcc-trunk
--enable-sanitizers --enable-languages=c,c++ --disable-werror
--disable-multilib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 14.0.0 20230629 (experimental) [master r14-924-gd709841ae0f] (GCC)
[642] %
[642] % gcctk -O2 -fselective-scheduling2 -fno-tree-pre small.c
[643] % ./a.out
34
[644] % gcctk -O2 small.c
[645] % ./a.out
1
[646] % cat small.c
int printf(const char *, ...);
int a, b;
int main() {
unsigned int c = 0;
unsigned char d = 33;
for (; a < 1; a++) {
unsigned int e = 0;
unsigned char f = 0;
if (c < 1) {
e = f = d;
c = b * 4;
if (c < b)
printf("%ld", (long)d);
if (!f)
break;
}
c = e;
d = f;
}
printf("%d\n", a);
return 0;
}
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug rtl-optimization/110391] [12/13/14 Regression] wrong code at -O2 and -O3 with "-fsel-sched-pipelining -fselective-scheduling2" on x86_64-linux-gnu
2023-06-24 13:17 [Bug rtl-optimization/110391] New: wrong code at -O2 and -O3 with "on x86_64-linux-gnu zhendong.su at inf dot ethz.ch
` (4 preceding siblings ...)
2023-06-29 17:33 ` zhendong.su at inf dot ethz.ch
@ 2024-03-04 1:49 ` law at gcc dot gnu.org
5 siblings, 0 replies; 7+ messages in thread
From: law at gcc dot gnu.org @ 2024-03-04 1:49 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110391
Jeffrey A. Law <law at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P4
CC| |law at gcc dot gnu.org
^ permalink raw reply [flat|nested] 7+ messages in thread
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2023-06-24 13:17 [Bug rtl-optimization/110391] New: wrong code at -O2 and -O3 with "on x86_64-linux-gnu zhendong.su at inf dot ethz.ch
2023-06-24 13:20 ` [Bug rtl-optimization/110391] wrong code at -O2 and -O3 with "-fsel-sched-pipelining -fselective-scheduling2" on x86_64-linux-gnu zhendong.su at inf dot ethz.ch
2023-06-24 15:23 ` [Bug rtl-optimization/110391] [12/13/14 Regression] " pinskia at gcc dot gnu.org
2023-06-26 9:12 ` zhendong.su at inf dot ethz.ch
2023-06-29 9:18 ` zhendong.su at inf dot ethz.ch
2023-06-29 17:33 ` zhendong.su at inf dot ethz.ch
2024-03-04 1:49 ` law at gcc dot gnu.org
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