r236066 - in /trunk/gcc: ChangeLog testsuite/Ch...

[rguenth@gcc.gnu.org]

Author: rguenth
Date: Tue May 10 08:20:43 2016
New Revision: 236066

URL: https://gcc.gnu.org/viewcvs?rev=236066&root=gcc&view=rev
Log:
2016-05-10  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/70497
	PR tree-optimization/28367
	* tree-ssa-sccvn.c (vn_nary_build_or_lookup): New function
	split out from ...
	(visit_reference_op_load): ... here.
	(vn_reference_lookup_3): Use it to handle subreg-like accesses
	with simplified BIT_FIELD_REFs.
	* tree-ssa-pre.c (eliminate_insert): Handle inserting BIT_FIELD_REFs.
	* tree-complex.c (extract_component): Handle BIT_FIELD_REFs
	correctly.

	* gcc.dg/torture/20160404-1.c: New testcase.
	* gcc.dg/tree-ssa/ssa-fre-54.c: Likewise.
	* gcc.dg/tree-ssa/ssa-fre-55.c: Likewise.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/20160404-1.c
    trunk/gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-54.c
    trunk/gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-55.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-complex.c
    trunk/gcc/tree-ssa-pre.c
    trunk/gcc/tree-ssa-sccvn.c