[Bug c/14788] New: Subtracting a double from a short gives incorrect result

["rick at glentng dot com" <gcc-bugzilla at gcc dot gnu dot org>]

As this is the first bug I have reported in GCC please bear with me - I hope I 
have provided all the information you need.  This has been confirmed as being a 
bug by Eric Botcazou when I originally emailed this to gcc-bugs@gcc.gnu.org

This program needs no header files:

extern int printf (__const char *__restrict __format, ...) ;

int main()
{
short ss;
short fortyk = 40000;

printf("Integer Subtraction\n");
ss = fortyk;
printf("ss = %d\n", ss);
ss = ss - 10000;
printf("ss = %d\n", ss);

printf("Real Subtraction\n");
ss = fortyk;
printf("ss = %d\n", ss);
ss = ss - 10000.0;
printf("ss = %d\n", ss);

return(0);
}

Results are:

> Integer Subtraction
> DDN = -25536
> DDN = 30000
> Real Subtraction
> DDN = -25536
> DDN = -32768

Results should be:

> Integer Subtraction
> DDN = -25536
> DDN = 30000
> Real Subtraction
> DDN = -25536
> DDN = 30000

gcc -v tells me:

Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/3.3.3/specs
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/u
sr/share/info --enable-shared --enable-threads=posix --disable-checking --disabl
e-libunwind-exceptions --with-system-zlib --enable-__cxa_atexit --host=i386-redh
at-linux
Thread model: posix
gcc version 3.3.3 20040311 (Red Hat Linux 3.3.3-3)

My GCC was downloaded as a binary - I did not build it.

Regards,

Rick Murphy

-- 
           Summary: Subtracting a double from a short gives incorrect result
           Product: gcc
           Version: 3.3.3
            Status: UNCONFIRMED
          Severity: critical
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: rick at glentng dot com
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: Sorry don't understand the question
  GCC host triplet: Redhat 9, Linux 2.4.20-8 #1 Thu Mar 13 17:54:28 EST 2003
                    i686 i6
GCC target triplet: Redhat 9, Linux 2.4.20-8 #1 Thu Mar 13 17:54:28 EST 2003
                    i686 i6


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14788