r230087 - in /trunk/gcc: ChangeLog regrename.c ...

[rts@gcc.gnu.org]

Author: rts
Date: Tue Nov 10 09:12:52 2015
New Revision: 230087

URL: https://gcc.gnu.org/viewcvs?rev=230087&root=gcc&view=rev
Log:
Tie chains for move instructions.

gcc/
	* regrename.c (create_new_chain): Initialize renamed and tied_chain.
	(build_def_use): Initialize terminated_this_insn.
	(find_best_rename_reg): Pick and check register from the tied chain.
	(regrename_do_replace): Mark head as renamed.
	(struct du_head *terminated_this_insn). New static variable.
	(scan_rtx_reg): Tie chains in move insns.  Set terminated_this_insn.
	* regrename.h (struct du_head): Add tied_chain, renamed members.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/regrename.c
    trunk/gcc/regrename.h