Hi,
Attached is a patch to replace "return NULL_RTX" with "return 0".
In the past, there were some arguments to prefer 0 to NULL_RTX, such
as
http://gcc.gnu.org/ml/gcc-patches/2001-03/msg01566.html
One of the problems that were pointed out was that arguments to
variadic functions need to be typed, but return values should have no
problem because they are always typed.
I could do a massive automated replace, but I chose to manually check
the actual return type just in case and go through files one by one.
Bootstrapped on i686-pc-linux-gnu. OK to apply?