egcs/gcc unroll.c loop.h ChangeLog

[m.hayes@cygnus.com]

CVSROOT:	/egcs/carton/cvsfiles
Module name:	egcs
Changes by:	m.hayes@egcs.cygnus.com	98/11/25 21:32:29

Modified files:
	gcc            : unroll.c loop.h ChangeLog 

Log message:
	* loop.h (precondition_loop_p): Added new mode argument.
	* unroll.c (precondition_loop_p): Likewise.
	(approx_final_value): Function deleted and subsumed
	into loop_iterations.
	(loop_find_equiv_value): New function.
	(loop_iterations): Use loop_find_equiv_value to find increments
	too large to be immediate constants.  Also use it to find terms
	common to initial and final iteration values that can be removed.