* config/rs6000/rs6000.md (QHSI): New mode macro.

	(wd): Extend mode attr for QImode and HImode
	(dbits): New mode attr.
	(zero_extend<mode>di2): Convert to mode macro.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@103118 138bc75d-0d04-0410-961f-82ee72b054a4