[Bug math/31600] New: math: x86 ceill traps when FE_INEXACT is enabled

[Bug math/31600] New: math: x86 ceill traps when FE_INEXACT is enabled

[adhemerval.zanella at linaro dot org]

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

[adhemerval.zanella at linaro dot org]

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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