Fix uninitialized access in merge_call_side_effects

gcc/ChangeLog:

	PR ipa/103262
	* ipa-modref.c (merge_call_side_effects): Fix uninitialized
	access.

gcc/testsuite/ChangeLog:

	* gcc.dg/tree-ssa/modref-dse-5.c: New test.

1 files changed, 43 insertions, 0 deletions

diff --git a/gcc/testsuite/gcc.dg/tree-ssa/modref-dse-5.c b/gcc/testsuite/gcc.dg/tree-ssa/modref-dse-5.c
new file mode 100644
index 0000000..ad35b70
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tree-ssa/modref-dse-5.c
@@ -0,0 +1,43 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-tree-dse2-details"  } */
+struct a {int a,b,c;};
+__attribute__ ((noinline))
+void
+kill_me (struct a *a)
+{
+  a->a=0;
+  a->b=0;
+  a->c=0;
+}
+__attribute__ ((noinline))
+int
+wrap(int b, struct a *a)
+{
+   kill_me (a);
+   return b;
+}
+__attribute__ ((noinline))
+void
+my_pleasure (struct a *a)
+{
+  a->a=1;
+  a->c=2;
+}
+__attribute__ ((noinline))
+int
+wrap2(int b, struct a *a)
+{
+   my_pleasure (a);
+   return b;
+}
+
+int
+set (struct a *a)
+{
+  wrap (0, a);
+  int ret = wrap2 (0, a);
+  //int ret = my_pleasure (a);
+  a->b=1;
+  return ret;
+}
+/* { dg-final { scan-tree-dump "Deleted dead store: wrap" "dse2" } } */