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* [Bug math/31600] New: math: x86 ceill traps when FE_INEXACT is enabled
@ 2024-04-03 18:56 adhemerval.zanella at linaro dot org
2024-04-04 17:39 ` [Bug math/31600] " adhemerval.zanella at linaro dot org
0 siblings, 1 reply; 2+ messages in thread
From: adhemerval.zanella at linaro dot org @ 2024-04-03 18:56 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=31600
Bug ID: 31600
Summary: math: x86 ceill traps when FE_INEXACT is enabled
Product: glibc
Version: 2.39
Status: NEW
Severity: normal
Priority: P2
Component: math
Assignee: unassigned at sourceware dot org
Reporter: adhemerval.zanella at linaro dot org
Target Milestone: ---
The implementations of ceil functions using x87 floating point (i386 and x86_64
long double only) traps when FE_INEXACT is enabled. Although this is a GNU
extension outside the scope of the C standard, other architectures that also
support traps do not show this behavior (aarch64, powerpc64).
The following test shows that issue:
$ cat test-ceil.c
#include <assert.h>
#include <math.h>
#include <fenv.h>
int main (int argc, char *argv[])
{
feenableexcept (FE_INEXACT);
volatile long double a = 1.5;
volatile long double b __attribute__ ((unused));
b = ceill (a);
assert (fegetexcept () == FE_INEXACT);
return 0;
}
$ gcc -Wall -D_GNU_SOURCE test-ceil.c -lm && ./a.out
Floating point exception (core dumped)
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* [Bug math/31600] math: x86 ceill traps when FE_INEXACT is enabled
2024-04-03 18:56 [Bug math/31600] New: math: x86 ceill traps when FE_INEXACT is enabled adhemerval.zanella at linaro dot org
@ 2024-04-04 17:39 ` adhemerval.zanella at linaro dot org
0 siblings, 0 replies; 2+ messages in thread
From: adhemerval.zanella at linaro dot org @ 2024-04-04 17:39 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=31600
Adhemerval Zanella <adhemerval.zanella at linaro dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |2.40
Status|NEW |RESOLVED
Resolution|--- |FIXED
Assignee|unassigned at sourceware dot org |adhemerval.zanella at linaro dot o
| |rg
--- Comment #1 from Adhemerval Zanella <adhemerval.zanella at linaro dot org> ---
Fixed on 2.40.
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2024-04-03 18:56 [Bug math/31600] New: math: x86 ceill traps when FE_INEXACT is enabled adhemerval.zanella at linaro dot org
2024-04-04 17:39 ` [Bug math/31600] " adhemerval.zanella at linaro dot org
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