[Bug c/28331] New: Problem with floating point operations after calling __builtin_ia32_movntq

["cedric dot augonnet at ens-lyon dot org" <gcc-bugzilla at gcc dot gnu dot org>]

Hi,
After calling __builtin_ia32_movntq, floating point operations do not seem to
work anymore : 

When compiling this with the msse flag :

------------------------------------------------------

#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>

int main()
{
        unsigned long long int a,b;
        a = 1ULL;
        b = 2ULL;

        __builtin_ia32_movntq(&a,b);

        printf("%f\n", ((float) (1*2)));
        return 0;

}

--------------------------------------------------------

It returns "nan" instead of 2 as we might have expected.

Regards, 
Cédric


-- 
           Summary: Problem with floating point operations after calling
                    __builtin_ia32_movntq
           Product: gcc
           Version: 4.1.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: cedric dot augonnet at ens-lyon dot org
 GCC build triplet: i486-linux-gnu
  GCC host triplet: i486-linux-gnu
GCC target triplet: i486-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28331