GCC aborts when the given testcase is compiled with -O2 -fnew-ra option. The 
description is given below:

Testcase that fails:
void fails()
{
    long * a ;
    long b, ab;
    ab= *a+ab;
    b = *a / ab ;
    if (b)
    abc(b);
    *a = b / ab ;
}
int main()
{

 fails();
 return 0;

}
aanchalk@oasis:~> ~/build-new-ra/install/bin/x86_64-unknown-linux-gnu-gcc -fnew-
ra -O2 -c fail.i
fail.i: In function `fails':

fail.i:10: internal compiler error: in compare_and_free_webs, at ra-build.c:1767
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.

GCC is configured as

/home/aanchalk/build-new-ra/install/bin/../lib/gcc/x86_64-unknown-linux-
gnu/3.4/specs
Configured with: /home/aanchalk/srcs-new-ra/configure --
prefix=/home/aanchalk/build-new-ra/install/ --enable-languages=c

Thread model: posix
gcc version 3.4 20031009 (experimental) (new RA)