From 6b68f00d4c2b375dad66bd6e72c01c309b4085c5 Mon Sep 17 00:00:00 2001 From: Richard Biener Date: Fri, 19 Jul 2019 16:19:39 +0000 Subject: re PR tree-optimization/91211 (wrong code with __builtin_memset() and __builtin_memcpy() at -O1 and above) 2019-07-19 Richard Biener PR tree-optimization/91211 * tree-ssa-sccvn.c (vn_walk_cb_data::push_partial_def): Fix memset encoding size. * gcc.dg/torture/pr91211.c: New testcase. From-SVN: r273605 --- gcc/tree-ssa-sccvn.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'gcc/tree-ssa-sccvn.c') diff --git a/gcc/tree-ssa-sccvn.c b/gcc/tree-ssa-sccvn.c index f12c9dd..5b0460d 100644 --- a/gcc/tree-ssa-sccvn.c +++ b/gcc/tree-ssa-sccvn.c @@ -1818,7 +1818,8 @@ vn_walk_cb_data::push_partial_def (const pd_data &pd, tree vuse, if (TREE_CODE (pd.rhs) == CONSTRUCTOR) /* Empty CONSTRUCTOR. */ memset (buffer + MAX (0, pd.offset), - 0, MIN ((HOST_WIDE_INT)sizeof (buffer), pd.size)); + 0, MIN ((HOST_WIDE_INT)sizeof (buffer), + pd.size + MIN (0, pd.offset))); else { unsigned pad = 0; -- cgit v1.1