gcc-2.7 creates faster code than pgcc-1.1.1

[David Edelsohn]

>>>>> Jeffrey A Law writes:

Jeff> True, but I don't believe the loop optimizer is prepared to do that since it
Jeff> doesn't keep track of what bits are active vs what bits are inactive in a 
Jeff> value.

	GCC is missing a general feature of value propagation which would
help with a lot of optimizations like this.  Hopefully this infrastructure
will be added or contributed someday.

David