[Bug math/16198] New: fegetenv() clears exception mask on x86_64

["fxcoudert at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=16198

            Bug ID: 16198
           Summary: fegetenv() clears exception mask on x86_64
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: math
          Assignee: unassigned at sourceware dot org
          Reporter: fxcoudert at gcc dot gnu.org

Take the following code:

#include <stdio.h>
#include <fenv.h>

int main (void)
{
  fenv_t e;

  printf ("%d\n", fegetexcept () & FE_INVALID ? 1 : 0);
  feenableexcept (FE_INVALID);
  printf ("%d\n", fegetexcept () & FE_INVALID ? 1 : 0);
  fegetenv (&e);
  printf ("%d\n", fegetexcept () & FE_INVALID ? 1 : 0);
  fesetenv (&e);
  printf ("%d\n", fegetexcept () & FE_INVALID ? 1 : 0);
}


I expect it to output "0 1 1 1", and it does on i386-linux. But on
x86_64-linux, it outputs "0 1 0 1", showing that the call to fegetenv() clears
the exception mask. I don't see this behavior documented, and I don't think
it's allowed.

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