[Bug c++/31106] New: FPE, floating point exception bugs

[burlen at apollo dot sr dot unh dot edu]

1) fesetexcept(FE_EXCEPT_ALL) sets the control fpu control word to 0x342, so
that the denormal operand exeption is masked, by definition all exceptions are
supposed to be enabled so it should be using 0x340.

2) If I establish a signal handler for FPEs the fpu is being reset to its
default state before the signal handler is called, so that fegetexcept and
fegetenv are unable to return any information about the exception that occured.

here is information about my FC2 x86_64 athlon system:

[burlen@quaoar burlen]$ g++ -v
Reading specs from /usr/lib/gcc-lib/x86_64-redhat-linux/3.3.3/specs
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man
--infodir=/usr/share/info --enable-shared --enable-threads=posix
--disable-checking --disable-libunwind-exceptions --with-system-zlib
--enable-__cxa_atexit --host=x86_64-redhat-linux
Thread model: posix
gcc version 3.3.3 20040412 (Red Hat Linux 3.3.3-7)


-- 
           Summary: FPE, floating point exception bugs
           Product: gcc
           Version: 3.3.3
            Status: UNCONFIRMED
          Severity: major
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: burlen at apollo dot sr dot unh dot edu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31106