r242950 - in /trunk/gcc: ChangeLog combine.c

[segher@gcc.gnu.org]

Author: segher
Date: Tue Nov 29 05:44:32 2016
New Revision: 242950

URL: https://gcc.gnu.org/viewcvs?rev=242950&root=gcc&view=rev
Log:
combine: Tweak change_zero_ext

change_zero_ext handles (zero_extend:M1 (subreg:M2 (reg:M1) ...))
already; this patch extends it to also deal with any
(zero_extend:M1 (subreg:M2 (reg:M3) ...)) where the subreg is not
paradoxical.


	* combine.c (change_zero_ext): Also handle extends from a subreg
	to a mode bigger than that of the operand of the subreg.

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