egcs/gcc ChangeLog.RA ra.c df.c df.h

[matz@gcc.gnu.org]

CVSROOT:	/cvs/gcc
Module name:	egcs
Branch: 	new-regalloc-branch
Changes by:	matz@gcc.gnu.org	2001-06-20 01:54:12

Modified files:
	gcc            : ChangeLog.RA ra.c df.c df.h 

Log message:
	I nearly forgot to commit:
	2001-06-20  Michael Matz  <matzmich@cs.tu-berlin.de>
	
	subreg handling
	
	* df.c (df_uses_record): case SET, GET_CODE(dst)==SUBREG: don't
	add a use for the def, if it's wider than word, and the subreg isn't
	paradoxical.
	
	* df.h (DF_REF_REAL_LOC): New.
	(DF_REF_LOC): Define with help from above.
	
	* ra.c : Don't define OLD_DF_INTERFACE, #include "tm_p.h".
	(struct tagged_conflict): New.
	(struct web_part): Delete conflicts, add sub_conflicts (of the
	above type).  Adjust users of that field.
	(struct web): Add has_sub_conflicts, artificial.
	(struct conflict_link): New.
	(union_web_part_roots): Use them.
	(rtx_to_bits, find_sub_conflicts, get_sub_conflicts,
	undef_to_bitmap): New.
	(regs_overlap_p): Rename to...
	(defuse_overlap_p): this.
	(live_out_1): Use them.
	(find_subweb_2, add_subweb_2, find_web_for_subweb,
	regs_overlap_p): New.
	(add_conflict_edge): Breakout from ...
	(record_conflict): here.
	(sup_igraph): New, (de)allocate where also igraph is (de)allocated.
	(struct visit_trace, num_subwebs, SUBWEB_P, BYTE_BEGIN,
	BYTE_LENGTH): New.
	(add_conflict_edge): Add a fake conflict (->s==NULL).
	Set sup_igraph bit.
	(parts_to_webs): Create needed artificial webs.
	(conflicts_between_webs): Create conflict lists out of sub_conflicts.
	(remember_web_was_spilled, simplify, ok, conservative, combine,
	colorize_one_web): Deal with fake conflicts.
	(coalesce): Use sup_igraph instead igraph to prevent coalescing.
	(detect_spill_temps, build_worklists, emit_colors): Only deal with
	full webs.
	(colorize_one_web): Also try to spill smaller already colored
	neighbors in case we happen to spill a spill-temp.
	(rewrite_program): Only load or store the part which really is needed
	by the insn (i.e. subreg).
	(vim:): modeline adjusted ;-)

Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/egcs/gcc/ChangeLog.RA.diff?cvsroot=gcc&only_with_tag=new-regalloc-branch&r1=1.1.2.21&r2=1.1.2.22
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/egcs/gcc/ra.c.diff?cvsroot=gcc&only_with_tag=new-regalloc-branch&r1=1.1.2.7&r2=1.1.2.8
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/egcs/gcc/df.c.diff?cvsroot=gcc&only_with_tag=new-regalloc-branch&r1=1.1.2.5&r2=1.1.2.6
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/egcs/gcc/df.h.diff?cvsroot=gcc&only_with_tag=new-regalloc-branch&r1=1.1.2.4&r2=1.1.2.5