r244472 - in /trunk/gcc: ChangeLog tree-ssa-dse.c

[law@gcc.gnu.org]

Author: law
Date: Sun Jan 15 09:34:01 2017
New Revision: 244472

URL: https://gcc.gnu.org/viewcvs?rev=244472&root=gcc&view=rev
Log:
	PR tree-optimization/79090
	* tree-ssa-dse.c (valid_ao_ref_for_dse): Reject zero length and
	variable length stores.
	(compute_trims): Delete dead assignment to *trim_tail.
	(dse_dom_walker::dse_optimize_stmt): Optimize mem* calls with
	zero length.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/tree-ssa-dse.c