r235660 - in /trunk/gcc: ChangeLog ira.c

[amodra@gcc.gnu.org]

Author: amodra
Date: Fri Apr 29 23:59:22 2016
New Revision: 235660

URL: https://gcc.gnu.org/viewcvs?rev=235660&root=gcc&view=rev
Log:
ira.c use DF infrastructure for combine_and_move_insns

This patch actually improves generated code, because REG_DEAD notes
used by the old insn scan are not always present.  On x86_64, see
gcc/wide-int-print.o:print_hex for an example of a function that is
smaller and uses one less callee saved reg.

	* ira.c (combine_and_move_insns): Rather than scanning insns,
	use DF infrastucture to find use and def insns.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/ira.c