r242839 - in /trunk/gcc: ChangeLog ree.c

[ebotcazou@gcc.gnu.org]

Author: ebotcazou
Date: Thu Nov 24 15:01:32 2016
New Revision: 242839

URL: https://gcc.gnu.org/viewcvs?rev=242839&root=gcc&view=rev
Log:
	PR rtl-optimization/78437
	* ree.c (get_uses): New function.
	(combine_reaching_defs): When a copy is needed, return false if any
	reaching use of the source register reads it in a mode larger than
	the mode it is set in and WORD_REGISTER_OPERATIONS is true.

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