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* [Bug middle-end/111701] New: [11/12/13/14 Regression] wrong code for __builtin_signbit(x*x)
@ 2023-10-05 8:12 amonakov at gcc dot gnu.org
2023-10-06 7:47 ` [Bug middle-end/111701] " rguenth at gcc dot gnu.org
2024-04-26 8:31 ` roger at nextmovesoftware dot com
0 siblings, 2 replies; 3+ messages in thread
From: amonakov at gcc dot gnu.org @ 2023-10-05 8:12 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111701
Bug ID: 111701
Summary: [11/12/13/14 Regression] wrong code for
__builtin_signbit(x*x)
Product: gcc
Version: 13.2.1
Status: UNCONFIRMED
Keywords: wrong-code
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: amonakov at gcc dot gnu.org
CC: amonakov at gcc dot gnu.org, eggert at cs dot ucla.edu,
rguenth at gcc dot gnu.org, unassigned at gcc dot gnu.org
Depends on: 111655
Target Milestone: ---
Target: x86_64-linux-gnu
+++ This bug was initially created as a clone of Bug #111655 +++
See bug 111655 comment 11: we incorrectly deduce nonnegative_p for
floating-point 'x * x', and the following aborts:
__attribute__((noipa))
static int f(float *x)
{
*x *= *x;
return __builtin_signbit(*x);
}
int main()
{
float x = -__builtin_nan("");
int s = f(&x);
if (s != __builtin_signbit(x))
__builtin_abort();
}
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111655
[Bug 111655] [11/12/13/14 Regression] wrong code generated for
__builtin_signbit and 0./0. on x86-64 -O2
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2023-10-05 8:12 [Bug middle-end/111701] New: [11/12/13/14 Regression] wrong code for __builtin_signbit(x*x) amonakov at gcc dot gnu.org
2023-10-06 7:47 ` [Bug middle-end/111701] " rguenth at gcc dot gnu.org
2024-04-26 8:31 ` roger at nextmovesoftware dot com
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