From 9bb06c2a9f8b83179cb76ba928b22aa3a2b57501 Mon Sep 17 00:00:00 2001 From: Richard Guenther Date: Wed, 22 Aug 2012 13:17:26 +0000 Subject: re PR tree-optimization/46590 (long compile time with -O2 and many loops) 2012-08-22 Richard Guenther PR tree-optimization/46590 * tree-ssa-alias.h (get_continuation_for_phi): Add alias query counter output argument. (walk_non_aliased_vuses): Add alias query counter argument to the walker callback. * tree-ssa-alias.c (maybe_skip_until): Add alias query counter output argument and count alias queries. (get_continuation_for_phi_1): Likewise. (get_continuation_for_phi): Likewise. (walk_non_aliased_vuses): Add alias query counter argument to the walker callback and allow it to abort the walk by returning -1. * tree-ssa-pre.c (translate_vuse_through_block): Adjust. * tree-ssa-sccvn.c (vn_reference_lookup_2): Add alias query counter parmeter, abort walk if that is bigger than --param sccvn-max-alias-queries-per-access. * params.def (sccvn-max-alias-queries-per-access): New param. * doc/invoke.texi (sccvn-max-alias-queries-per-access): Document. From-SVN: r190594 --- gcc/tree-ssa-pre.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'gcc/tree-ssa-pre.c') diff --git a/gcc/tree-ssa-pre.c b/gcc/tree-ssa-pre.c index e113539..6d10df8 100644 --- a/gcc/tree-ssa-pre.c +++ b/gcc/tree-ssa-pre.c @@ -1289,9 +1289,10 @@ translate_vuse_through_block (VEC (vn_reference_op_s, heap) *operands, if (use_oracle) { bitmap visited = NULL; + unsigned int cnt; /* Try to find a vuse that dominates this phi node by skipping non-clobbering statements. */ - vuse = get_continuation_for_phi (phi, &ref, &visited); + vuse = get_continuation_for_phi (phi, &ref, &cnt, &visited); if (visited) BITMAP_FREE (visited); } -- cgit v1.1