https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110282
--- Comment #14 from mcccs at gmx dot com ---
Minimized testcase:
int a[], d[];
long b, c, e, g;
int f, h, i;
short j, k, l;
int *m = a;
static int *n(int *o) {
int p = l == *o | k <= j;
p = *d;
h = c;
g = 0 == e;
f = *m;
b = 0;
re
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110282
--- Comment #13 from Sam James ---
No problem -- you may want to do -Werror=return-type -Werror=uninitialized
-Werror=sequence-point as well to reduce the chance of reducing to something
bogus. (-Werror=return-type would catch that issue I menti
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110282
--- Comment #12 from mcccs at gmx dot com ---
Thanks Sam, I'm restarting reduction this time checking if it compiles with
trunk GCC as well
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110282
--- Comment #11 from Sam James ---
(In reply to mcccs from comment #10)
Using the return value of e() when it didn't return anything is undefined.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110282
--- Comment #10 from mcccs at gmx dot com ---
Bad commit:
https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=ff6686d2e5f797d6c6a36ad14a7084bc1dc350e4
Minimal testcase:
int a[];
short b, c;
long d;
__attribute__((noipa)) long(e)() {}
static int f(in
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110282
--- Comment #9 from mcccs at gmx dot com ---
Sorry never mind I understand, it should still be bisected and reduced so that
any hidden bugs would be uncovered. I'll bisect it
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110282
mcccs at gmx dot com changed:
What|Removed |Added
CC||mcccs at gmx dot com
--- Comment
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110282
--- Comment #7 from Xi Ruoyao ---
(In reply to CTC from comment #6)
> Another related and smaller reproducer:
>
> # cat tmp.i
> main() {
> int *a = 0;
> int b = *a;
> }
No, this is an undefined behavior and the compiler is allowed to gener
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110282
--- Comment #6 from CTC <19373742 at buaa dot edu.cn> ---
Another related and smaller reproducer:
# cat tmp.i
main() {
int *a = 0;
int b = *a;
}
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110282
--- Comment #5 from Andrew Pinski ---
Note I suspect r12-248-gb58dc0b803057c0e6032e0d9b made the problem latent in
GCC 12+. But turning off DSE in GCC 12.1.0 does not reproduce the bug
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110282
--- Comment #4 from CTC <19373742 at buaa dot edu.cn> ---
(In reply to Richard Biener from comment #3)
> Confirmed behavior also with GCC 10, with -fno-bit-tests -fbit-tests
> -fno-ipa-modref -fipa-modref removed.
>
> Can you please adjust your
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110282
Richard Biener changed:
What|Removed |Added
Known to fail||10.4.0, 11.1.0, 11.3.0
Known to w
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110282
Xi Ruoyao changed:
What|Removed |Added
CC||xry111 at gcc dot gnu.org
--- Comment #2 fr
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