From: Richard Biener <rguenther@suse.de>
Date: Tue, 18 Jan 2022 12:26:22 +0000 (+0100)
Subject: tree-optimization/103987 - guard DSE modref query
X-Git-Tag: upstream/12.2.0~2025
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=3ed40db0f12994e64434dc2e0590ba1da7ba5f60;p=platform%2Fupstream%2Fgcc.git

tree-optimization/103987 - guard DSE modref query

This adds a missing guard for a pointer to the DSE modref query,
otherwise we can end up invoking APIs desired to only work on
pointers on non-pointers when there are mismatches between declared
and actual arguments of functions in the program.

2022-01-18  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/103987
	* tree-ssa-dse.cc (dse_optimize_call): Properly guard modref
	query with a pointer check.

	* gcc.dg/torture/pr103987.c: New testcase.
---

diff --git a/gcc/testsuite/gcc.dg/torture/pr103987.c b/gcc/testsuite/gcc.dg/torture/pr103987.c
new file mode 100644
index 0000000..6bfc768
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/torture/pr103987.c
@@ -0,0 +1,13 @@
+/* { dg-do compile } */
+
+void foo();
+
+void bar(int i)
+{
+  foo (i);
+}
+
+void foo(int *p)
+{
+  *p = 0;
+}
diff --git a/gcc/tree-ssa-dse.cc b/gcc/tree-ssa-dse.cc
index ed73bee..47997df 100644
--- a/gcc/tree-ssa-dse.cc
+++ b/gcc/tree-ssa-dse.cc
@@ -43,6 +43,7 @@ along with GCC; see the file COPYING3.  If not see
 #include "cgraph.h"
 #include "ipa-modref-tree.h"
 #include "ipa-modref.h"
+#include "target.h"
 
 /* This file implements dead store elimination.
 
@@ -1190,10 +1191,12 @@ dse_optimize_call (gimple_stmt_iterator *gsi, sbitmap live_bytes)
 	{
 	  tree arg = access_node.get_call_arg (stmt);
 
-	  if (!arg)
+	  if (!arg || !POINTER_TYPE_P (TREE_TYPE (arg)))
 	    return false;
 
-	  if (integer_zerop (arg) && flag_delete_null_pointer_checks)
+	  if (integer_zerop (arg)
+	      && !targetm.addr_space.zero_address_valid
+		    (TYPE_ADDR_SPACE (TREE_TYPE (arg))))
 	    continue;
 
 	  ao_ref ref;