[Bug tree-optimization/16521] New: [H8/300 Target] Warning:"Will never be executed " with -O2 option

["harshadk at kpitcummins dot com" <gcc-bugzilla at gcc dot gnu dot org>]

Hi,

Consider the  following test case for H8 target,with optimization option -O2 -
Wunreachable-code command line 
gives warning "will never be executed".
It works fine if the Factorial function variable "Val" is of int type.
Also if the Factorial function variable "Val" is declared as volatile float 
then it is working fine.  

---------------- test.c--------------
float foo (float X)
{
 float val = 1.0;
 int k,j;

 for (k=1; k < 5; k++)

 {
  val += 1.0;
 }
 return (val);
}---------------- test.c--------------

command line used:
h8300-elf-gcc -O2 -Wunreachable-code -S test.c


Observation :
-------------

test.c: In function 'foo':
test.c:11: warning: will never be executed

"This bug is not observed in GCC 3.5-20040627 snapshot but observed in GCC 3.4-
20040503 snapshot."


Regards,
Harshad Kulkarni
KPIT Cummins InfoSystems Ltd.
Pune, India

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Free download of GNU based tool-chains for Renesas' SH and H8 Series.
The following site also offers free technical support to its users. 
Visit http://www.kpitgnutools.com for details. 
Latest versions of KPIT GNU tools were released on June 1, 2004.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

-- 
           Summary: [H8/300 Target]  Warning:"Will never be executed " with
                    -O2 option
           Product: gcc
           Version: 3.4.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: harshadk at kpitcummins dot com
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: h8300-unknown-elf


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16521