2020-01-10 Richard Biener <rguenther@suse.de>

	* gimple-ssa-store-merging
	(pass_store_merging::terminate_all_aliasing_chains): Cache alias info.

From-SVN: r280106

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 81d8e5c3e29925d82325f7bcd3c2acbf9a3a657c..7f4b7fba724e8c3a93958be9165c9ecada332445 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2020-01-10  Richard Biener  <rguenther@suse.de>
+
+       * gimple-ssa-store-merging
+       (pass_store_merging::terminate_all_aliasing_chains): Cache alias info.
+
 2020-01-10  Martin Liska  <mliska@suse.cz>
 
        PR ipa/93217

diff --git a/gcc/gimple-ssa-store-merging.c b/gcc/gimple-ssa-store-merging.c
index 741b1ec039c6fc52d27888764a939decbb7ae773..8371323ef4a3f5dc126a93b9b76c1d4ec6224eab 100644 (file)
--- a/gcc/gimple-ssa-store-merging.c
+++ b/gcc/gimple-ssa-store-merging.c
@@ -2219,6 +2219,8 @@ pass_store_merging::terminate_all_aliasing_chains (imm_store_chain_info
     return false;
 
   tree store_lhs = gimple_store_p (stmt) ? gimple_get_lhs (stmt) : NULL_TREE;
+  ao_ref store_lhs_ref;
+  ao_ref_init (&store_lhs_ref, store_lhs);
   for (imm_store_chain_info *next = m_stores_head, *cur = next; cur; cur = next)
     {
       next = cur->next;
@@ -2233,9 +2235,12 @@ pass_store_merging::terminate_all_aliasing_chains (imm_store_chain_info
       FOR_EACH_VEC_ELT (cur->m_store_info, i, info)
        {
          tree lhs = gimple_assign_lhs (info->stmt);
-         if (ref_maybe_used_by_stmt_p (stmt, lhs)
-             || stmt_may_clobber_ref_p (stmt, lhs)
-             || (store_lhs && refs_output_dependent_p (store_lhs, lhs)))
+         ao_ref lhs_ref;
+         ao_ref_init (&lhs_ref, lhs);
+         if (ref_maybe_used_by_stmt_p (stmt, &lhs_ref)
+             || stmt_may_clobber_ref_p_1 (stmt, &lhs_ref)
+             || (store_lhs && refs_may_alias_p_1 (&store_lhs_ref,
+                                                  &lhs_ref, false)))
            {
              if (dump_file && (dump_flags & TDF_DETAILS))
                {