public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
* [Bug tree-optimization/107269] New: wrong code at -O1 and above with "-fno-tree-ccp" on x86_64-linux-gnu
@ 2022-10-14 18:22 zhendong.su at inf dot ethz.ch
2022-10-14 18:29 ` [Bug tree-optimization/107269] " 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 @ 2022-10-14 18:22 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107269
Bug ID: 107269
Summary: wrong code at -O1 and above with "-fno-tree-ccp" on
x86_64-linux-gnu
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: zhendong.su at inf dot ethz.ch
Target Milestone: ---
It appears to be a recent regression.
Compiler Explorer: https://godbolt.org/z/WdcsavxTh
[593] % gcctk -v
Using built-in specs.
COLLECT_GCC=gcctk
COLLECT_LTO_WRAPPER=/local/suz-local/software/local/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/13.0.0/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 --enable-multilib
--with-system-zlib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 13.0.0 20221014 (experimental) [master r13-3307-g8efc38347a7] (GCC)
[594] %
[594] % gcctk -O1 small.c; ./a.out
[595] %
[595] % gcctk -O1 -fno-tree-ccp small.c
[596] % ./a.out
Floating point exception
[597] %
[597] % cat small.c
int a, b, f;
char c = 3;
unsigned d = 1;
short e;
int main() {
int h = 2357999721;
char i = a = 3;
for (; a >= 0; a--) {
int *j = &h;
char k = i || c;
short l = ~h;
b = ~(d % h);
f = ~i / b;
if (h >= -1936967575) {
int m = h / d / 110000000 ^ (f & c);
short n = c;
if (h <= -1936967575)
n = e;
h = m;
c = ~(n + f);
d = -1;
}
i = ~l - k;
}
return 0;
}
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/107269] wrong code at -O1 and above with "-fno-tree-ccp" on x86_64-linux-gnu
2022-10-14 18:22 [Bug tree-optimization/107269] New: wrong code at -O1 and above with "-fno-tree-ccp" on x86_64-linux-gnu zhendong.su at inf dot ethz.ch
@ 2022-10-14 18:29 ` zhendong.su at inf dot ethz.ch
2022-10-15 20:45 ` zhendong.su at inf dot ethz.ch
` (4 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: zhendong.su at inf dot ethz.ch @ 2022-10-14 18:29 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107269
--- Comment #1 from Zhendong Su <zhendong.su at inf dot ethz.ch> ---
A related instance:
[537] % gcctk -v
Using built-in specs.
COLLECT_GCC=gcctk
COLLECT_LTO_WRAPPER=/local/suz-local/software/local/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/13.0.0/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 --enable-multilib
--with-system-zlib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 13.0.0 20221014 (experimental) [master r13-3307-g8efc38347a7] (GCC)
[538] %
[538] % gcctk -O1 small.c; ./a.out
[539] %
[539] % gcctk -O1 -fno-tree-ccp small.c
[540] % timeout -s 9 5 ./a.out
Killed
[541] %
[541] % cat small.c
int a, c, d;
unsigned b;
int main() {
int f = 1;
L1:
c = f;
L2:
b & f;
short i = -f;
if (!a) {
d = f;
f = ~(b % f);
if (d > -1)
goto L2;
}
f = i;
if (a)
goto L1;
int *j = &f;
return 0;
}
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/107269] wrong code at -O1 and above with "-fno-tree-ccp" on x86_64-linux-gnu
2022-10-14 18:22 [Bug tree-optimization/107269] New: wrong code at -O1 and above with "-fno-tree-ccp" on x86_64-linux-gnu zhendong.su at inf dot ethz.ch
2022-10-14 18:29 ` [Bug tree-optimization/107269] " zhendong.su at inf dot ethz.ch
@ 2022-10-15 20:45 ` zhendong.su at inf dot ethz.ch
2022-10-17 3:26 ` crazylht at gmail dot com
` (3 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: zhendong.su at inf dot ethz.ch @ 2022-10-15 20:45 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107269
--- Comment #2 from Zhendong Su <zhendong.su at inf dot ethz.ch> ---
Another related instance:
[642] % gcctk -v
Using built-in specs.
COLLECT_GCC=gcctk
COLLECT_LTO_WRAPPER=/local/suz-local/software/local/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/13.0.0/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 --enable-multilib
--with-system-zlib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 13.0.0 20221015 (experimental) [master r13-3311-gbaeec7cc83b] (GCC)
[643] %
[643] % gcctk -O1 small.c; ./a.out
[644] %
[644] % gcctk -O1 -fno-tree-ccp small.c
[645] % ./a.out
Aborted
[646] %
[646] % cat small.c
char a;
unsigned b;
int d = 39381789, e, f, g = 1;
long h, i;
int main() {
int j = 38;
long k = 1;
for (; e < 8; e++)
if (k)
while (1) {
int l = j * h;
char m = j;
if (g)
m = a;
f = j;
b = d;
j = d = b * f;
if (d < 665)
break;
if (f > d)
k = m;
long n = ~(b - i);
i = ~h;
if (b <= 46295405)
break;
h = n;
int *c = &j;
if (i > 10843)
__builtin_abort();
}
return 0;
}
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/107269] wrong code at -O1 and above with "-fno-tree-ccp" on x86_64-linux-gnu
2022-10-14 18:22 [Bug tree-optimization/107269] New: wrong code at -O1 and above with "-fno-tree-ccp" on x86_64-linux-gnu zhendong.su at inf dot ethz.ch
2022-10-14 18:29 ` [Bug tree-optimization/107269] " zhendong.su at inf dot ethz.ch
2022-10-15 20:45 ` zhendong.su at inf dot ethz.ch
@ 2022-10-17 3:26 ` crazylht at gmail dot com
2022-10-17 7:48 ` rguenth at gcc dot gnu.org
` (2 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: crazylht at gmail dot com @ 2022-10-17 3:26 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107269
Hongtao.liu <crazylht at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |crazylht at gmail dot com
--- Comment #3 from Hongtao.liu <crazylht at gmail dot com> ---
Looks like the same issue as PR107172 since below change can also pass all the
testcase in the PR.
diff --git a/gcc/config/i386/i386.md b/gcc/config/i386/i386.md
index 8e847520491..be815341af5 100644
--- a/gcc/config/i386/i386.md
+++ b/gcc/config/i386/i386.md
@@ -21335,7 +21335,7 @@ (define_insn "*x86_mov<mode>cc_0_m1_neg"
(define_expand "x86_mov<mode>cc_0_m1_neg"
[(parallel
[(set (match_operand:SWI48 0 "register_operand")
- (neg:SWI48 (ltu:SWI48 (reg:CCC FLAGS_REG) (const_int 0))))
+ (neg:SWI48 (ltu:SWI48 (reg:CC FLAGS_REG) (const_int 0))))
(clobber (reg:CC FLAGS_REG))])])
(define_split
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/107269] wrong code at -O1 and above with "-fno-tree-ccp" on x86_64-linux-gnu
2022-10-14 18:22 [Bug tree-optimization/107269] New: wrong code at -O1 and above with "-fno-tree-ccp" on x86_64-linux-gnu zhendong.su at inf dot ethz.ch
` (2 preceding siblings ...)
2022-10-17 3:26 ` crazylht at gmail dot com
@ 2022-10-17 7:48 ` rguenth at gcc dot gnu.org
2022-10-17 19:07 ` hjl.tools at gmail dot com
2022-10-18 3:31 ` crazylht at gmail dot com
5 siblings, 0 replies; 7+ messages in thread
From: rguenth at gcc dot gnu.org @ 2022-10-17 7:48 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107269
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |DUPLICATE
Status|UNCONFIRMED |RESOLVED
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
dup then
*** This bug has been marked as a duplicate of bug 107172 ***
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/107269] wrong code at -O1 and above with "-fno-tree-ccp" on x86_64-linux-gnu
2022-10-14 18:22 [Bug tree-optimization/107269] New: wrong code at -O1 and above with "-fno-tree-ccp" on x86_64-linux-gnu zhendong.su at inf dot ethz.ch
` (3 preceding siblings ...)
2022-10-17 7:48 ` rguenth at gcc dot gnu.org
@ 2022-10-17 19:07 ` hjl.tools at gmail dot com
2022-10-18 3:31 ` crazylht at gmail dot com
5 siblings, 0 replies; 7+ messages in thread
From: hjl.tools at gmail dot com @ 2022-10-17 19:07 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107269
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Version|unknown |13.0
--- Comment #5 from H.J. Lu <hjl.tools at gmail dot com> ---
*** This bug has been marked as a duplicate of bug 107273 ***
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/107269] wrong code at -O1 and above with "-fno-tree-ccp" on x86_64-linux-gnu
2022-10-14 18:22 [Bug tree-optimization/107269] New: wrong code at -O1 and above with "-fno-tree-ccp" on x86_64-linux-gnu zhendong.su at inf dot ethz.ch
` (4 preceding siblings ...)
2022-10-17 19:07 ` hjl.tools at gmail dot com
@ 2022-10-18 3:31 ` crazylht at gmail dot com
5 siblings, 0 replies; 7+ messages in thread
From: crazylht at gmail dot com @ 2022-10-18 3:31 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107269
--- Comment #6 from Hongtao.liu <crazylht at gmail dot com> ---
(In reply to Hongtao.liu from comment #3)
> Looks like the same issue as PR107172 since below change can also pass all
> the
> testcase in the PR.
>
> diff --git a/gcc/config/i386/i386.md b/gcc/config/i386/i386.md
> index 8e847520491..be815341af5 100644
> --- a/gcc/config/i386/i386.md
> +++ b/gcc/config/i386/i386.md
> @@ -21335,7 +21335,7 @@ (define_insn "*x86_mov<mode>cc_0_m1_neg"
> (define_expand "x86_mov<mode>cc_0_m1_neg"
> [(parallel
> [(set (match_operand:SWI48 0 "register_operand")
> - (neg:SWI48 (ltu:SWI48 (reg:CCC FLAGS_REG) (const_int 0))))
> + (neg:SWI48 (ltu:SWI48 (reg:CC FLAGS_REG) (const_int 0))))
> (clobber (reg:CC FLAGS_REG))])])
>
> (define_split
Sorry, my patch against an older gcc before the guilty commit, and I compare
the result between it and latest GCC, that's why it show the patch pass the
testcase.
^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2022-10-18 3:31 UTC | newest]
Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2022-10-14 18:22 [Bug tree-optimization/107269] New: wrong code at -O1 and above with "-fno-tree-ccp" on x86_64-linux-gnu zhendong.su at inf dot ethz.ch
2022-10-14 18:29 ` [Bug tree-optimization/107269] " zhendong.su at inf dot ethz.ch
2022-10-15 20:45 ` zhendong.su at inf dot ethz.ch
2022-10-17 3:26 ` crazylht at gmail dot com
2022-10-17 7:48 ` rguenth at gcc dot gnu.org
2022-10-17 19:07 ` hjl.tools at gmail dot com
2022-10-18 3:31 ` crazylht at gmail dot com
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).