[Bug c/21360] New: wrong result of 'if' statement with comparing of floating point with gcc.

["dtemirbulatov at ru dot mvista dot com" <gcc-bugzilla at gcc dot gnu dot org>]

Following code produces wrong results:

#include <stdio.h>

float f = -1.0f ;

int main( void )
{

        if ( (unsigned int)f != (unsigned int)-1.0f ) {
                printf( "%-12s %04d:NG...[%u]--->[%u]\n",
                        __FILE__, __LINE__, (unsigned int)-1.0f, (unsigned int)f ) ;
        } else {
                printf( "[%u]--->[%u] :OK\n", (unsigned int)-1.0f, (unsigned
int)f ) ;
        }

        return( 0 ) ;
}

[dinar@dinar tmp]$ /home/dinar/work/gcc-builds/gnu/gcc-i686-pc-linux-gnu/bin/gcc
sample.c -o sample
[dinar@dinar tmp]$ ./sample
sample.c     0010:NG...[0]--->[4294967295]
[dinar@dinar tmp]$ /home/dinar/work/gcc-builds/gnu/gcc-i686-pc-linux-gnu/bin/gcc -v
Using built-in specs.
Target: i686-pc-linux-gnu
Configured with: ../configure
--prefix=/home/dinar/work/gcc-builds/gnu/gcc-i686-pc-linux-gnu/
--enable-languages=c,c++
Thread model: posix
gcc version 4.1.0 20050429 (experimental)

-- 
           Summary: wrong result of 'if' statement with  comparing of
                    floating point with gcc.
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: dtemirbulatov at ru dot mvista dot com
                CC: dtemirbulatov at ru dot mvista dot com,gcc-bugs at gcc
                    dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21360