[PATCH] tree-optimization/103987 - guard DSE modref query

[Richard Biener via Gcc-patches]

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.

Bootstrapped and tested on x86_64-unknown-linux-gnu, pushed.

2022-01-18  Richard Biener  <rguent...@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.
---
 gcc/testsuite/gcc.dg/torture/pr103987.c | 13 +++++++++++++
 gcc/tree-ssa-dse.cc                     |  7 +++++--
 2 files changed, 18 insertions(+), 2 deletions(-)
 create mode 100644 gcc/testsuite/gcc.dg/torture/pr103987.c

diff --git a/gcc/testsuite/gcc.dg/torture/pr103987.c 
b/gcc/testsuite/gcc.dg/torture/pr103987.c
new file mode 100644
index 00000000000..6bfc76881a1
--- /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 ed73bee932a..47997df2125 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;
-- 
2.31.1