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* [Bug target/97442] New: Wrong represenation of AArch64 saba in RTL
@ 2020-10-15 11:18 ktkachov at gcc dot gnu.org
2021-08-17 1:23 ` [Bug target/97442] " pinskia at gcc dot gnu.org
2022-12-19 21:45 ` pinskia at gcc dot gnu.org
0 siblings, 2 replies; 3+ messages in thread
From: ktkachov at gcc dot gnu.org @ 2020-10-15 11:18 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97442
Bug ID: 97442
Summary: Wrong represenation of AArch64 saba in RTL
Product: gcc
Version: unknown
Status: UNCONFIRMED
Keywords: wrong-code
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: ktkachov at gcc dot gnu.org
Target Milestone: ---
Target: aarch64
This is similar to the issue fixed in
https://gcc.gnu.org/git/?p=gcc.git&a=commit;h=8544ed6eea68a80999504c8a4b21b77d29cd86e2
The representation of the SABA (and UABA) in RTL is not correct and the below
testcase will abort at -O3 -fwrapv:
#define N 16
signed char a[] = {-100, -100, -100, -100,-100, -100, -100, -100, -100, -100,
-100, -100, -100, -100, -100, -100 };
signed char b[] = { 100, 100, 100, 100, 100, 100, 100, 100, 100, 100, 100, 100,
100, 100, 100, 100 };
signed char out[N] = { 100, 100, 100, 100, 100, 100, 100, 100, 100, 100, 100,
100, 100, 100, 100, 100 };
__attribute__ ((noinline,noipa))
void
foo (void)
{
for (int i = 0; i < N; i++)
{
signed char diff = b[i] - a[i];
out[i] += diff > 0 ? diff : -diff;
}
}
signed char out2[N] = { 100, 100, 100, 100, 100, 100, 100, 100, 100, 100, 100,
100, 100, 100, 100, 100 };
__attribute__ ((noinline,noipa))
void
foo_scalar (void)
{
for (int i = 0; i < N; i++)
{
asm volatile ("");
signed char diff = b[i] - a[i];
out2[i] += diff > 0 ? diff : -diff;
}
}
int
main (void)
{
foo ();
foo_scalar ();
for (int i = 0; i < N; i++)
if (out[i] != out2[i])
__builtin_abort ();
return 0;
}
due to function foo generating a saba when it shouldn't
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug target/97442] Wrong represenation of AArch64 saba in RTL
2020-10-15 11:18 [Bug target/97442] New: Wrong represenation of AArch64 saba in RTL ktkachov at gcc dot gnu.org
@ 2021-08-17 1:23 ` pinskia at gcc dot gnu.org
2022-12-19 21:45 ` pinskia at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: pinskia at gcc dot gnu.org @ 2021-08-17 1:23 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97442
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I think this was fixed for GCC 11 with r11-6540. The trunk definitely works.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug target/97442] Wrong represenation of AArch64 saba in RTL
2020-10-15 11:18 [Bug target/97442] New: Wrong represenation of AArch64 saba in RTL ktkachov at gcc dot gnu.org
2021-08-17 1:23 ` [Bug target/97442] " pinskia at gcc dot gnu.org
@ 2022-12-19 21:45 ` pinskia at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: pinskia at gcc dot gnu.org @ 2022-12-19 21:45 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97442
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |11.0
Resolution|--- |FIXED
Status|UNCONFIRMED |RESOLVED
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Fixed.
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2022-12-19 21:45 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2020-10-15 11:18 [Bug target/97442] New: Wrong represenation of AArch64 saba in RTL ktkachov at gcc dot gnu.org
2021-08-17 1:23 ` [Bug target/97442] " pinskia at gcc dot gnu.org
2022-12-19 21:45 ` pinskia at gcc dot gnu.org
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