egcs/gcc ChangeLog combine.c

[davem@gcc.gnu.org]

CVSROOT:	/cvs/gcc
Module name:	egcs
Changes by:	davem@sourceware.cygnus.com	99/12/06 11:45:38

Modified files:
	gcc            : ChangeLog combine.c 

Log message:
	* combine.c (check_promoted_subreg, record_promoted_value): New
	functions.
	(combine_instructions): Use them to retain nonzero and sign bit
	information after SUBREGs are eliminated by optimizations in
	this pass if PROMOTE_FUNCTION_RETURN.