r263980 - in /trunk/gcc: ChangeLog testsuite/Ch...

[rguenth@gcc.gnu.org]

Author: rguenth
Date: Thu Aug 30 12:37:10 2018
New Revision: 263980

URL: https://gcc.gnu.org/viewcvs?rev=263980&root=gcc&view=rev
Log:
2018-08-30  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/87147
	* tree-ssa-sccvn.c (SSA_VISITED): New function.
	(visit_phi): When the degenerate result is from the backedge and
	we didn't visit its definition yet drop to VARYING.
	(do_rpo_vn): Properly mark blocks with incoming backedges as executable.

	* gcc.dg/torture/pr87147.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr87147.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-sccvn.c