PR 17104

[David Edelsohn]

	The zero_extend was added for a specific optimization reason.  It
was suppose to represent to the compiler tha the load implicitly was
performing a zero_extend, not forcing the compiler to emit a zero_extend.
I would like is some explanation why the original motivation for wrapping
the move in zero_extend a few years ago is superceded or no longer
applicable.

	Maybe we should just remove the "|| mode == SImode" part of the
test.  I am worried about making this changed based on "no discernable
difference in SPEC".

	Was the SPEC run with 32-bit PowerPC or 64-bit PowerPC?

Thanks, David