Wunreachable-8.c XPASS with flags '-O2 -Wunreachable-code'

Wunreachable-8.c XPASS with flags '-O2 -Wunreachable-code'

[Eric Fisher]

Hi,

----gcc.log----

Executing on host: /media/E/svn-gcc/build-trunk/gcc/xgcc
-B/media/E/svn-gcc/build-trunk/gcc/
/media/E/svn-gcc/trunk/gcc/testsuite/gcc.dg/Wunreachable-8.c   -O2
-Wunreachable-code -S  -o Wunreachable-8.s    (timeout = 300)
/media/E/svn-gcc/trunk/gcc/testsuite/gcc.dg/Wunreachable-8.c: In
function 'Factorial':
/media/E/svn-gcc/trunk/gcc/testsuite/gcc.dg/Wunreachable-8.c:9:11:
warning: will never be executed
output is:
/media/E/svn-gcc/trunk/gcc/testsuite/gcc.dg/Wunreachable-8.c: In
function 'Factorial':
/media/E/svn-gcc/trunk/gcc/testsuite/gcc.dg/Wunreachable-8.c:9:11:
warning: will never be executed

XPASS: gcc.dg/Wunreachable-8.c  (test for bogus messages, line 7)
XFAIL: gcc.dg/Wunreachable-8.c  (test for bogus messages, line 9)
PASS: gcc.dg/Wunreachable-8.c  (test for bogus messages, line 11)
PASS: gcc.dg/Wunreachable-8.c (test for excess errors)

Executing on host: /media/E/svn-gcc/build-trunk/gcc/xgcc -v    (timeout = 300)
Using built-in specs.
COLLECT_GCC=/media/E/svn-gcc/build-trunk/gcc/xgcc
Target: i686-pc-linux-gnu
Configured with: ../trunk/configure --prefix=/home/eric/install/trunk
--enable-languages=c --with-gmp=/home/eric/install/generic
--with-mpfr=/home/eric/install/generic : (reconfigured)
../trunk/configure --prefix=/home/eric/install/trunk
--enable-languages=c --with-gmp=/home/eric/install/generic
--with-mpfr=/home/eric/install/generic : (reconfigured)
../trunk/configure --prefix=/home/eric/install/trunk
--with-gmp=/home/eric/install/generic
--with-mpfr=/home/eric/install/generic --enable-languages=c
--no-create --no-recursion : (reconfigured) ../trunk/configure
--prefix=/home/eric/install/trunk
--with-gmp=/home/eric/install/generic
--with-mpfr=/home/eric/install/generic --enable-languages=c
--no-create --no-recursion
Thread model: posix
gcc version 4.5.0 20091027 (experimental) (GCC)
/media/E/svn-gcc/build-trunk/gcc/xgcc  version 4.5.0 20091027
(experimental) (GCC)


---------svn info-------------
Revision: 153584
Node Kind: directory
Schedule: normal
Last Changed Author: carrot
Last Changed Rev: 153584
Last Changed Date: 2009-10-27 17:06:36 +0800 (Tue, 27 Oct 2009)


This warning is generated after loop unrolling, when removing original latch bb.

Regards,
Eric