Add a testcase for PR tree-optimization/102892

PR tree-optimization/102892 is fixed by

commit 4b3a325f07acebf47e82de227ce1d5ba62f5bcae
Author: Aldy Hernandez <aldyh@redhat.com>
Date:   Thu Oct 28 15:35:21 2021 +0200

    Remove VRP threader passes in exchange for better threading pre-VRP.

	PR tree-optimization/102892
	* gcc.dg/pr102892-1.c: New file.
	* gcc.dg/pr102892-2.c: Likewise.

diff --git a/gcc/testsuite/gcc.dg/pr102892-1.c b/gcc/testsuite/gcc.dg/pr102892-1.c
new file mode 100644 (file)
index 0000000..a9302b5
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr102892-1.c
@@ -0,0 +1,21 @@
+/* { dg-do link } */
+/* { dg-options "-O3" } */
+/* { dg-additional-sources "pr102892-2.c" } */
+
+static long b[2][1] = {0};
+
+extern void bar(void);
+extern void foo(void);
+
+int
+main ()
+{
+  long c = 0;
+  for (long a; a < 1; ++a)
+    for (; c <= 1; c++) {
+      bar();
+      if (1 == b[c][0])
+       foo();
+    }
+  return 0;
+}

diff --git a/gcc/testsuite/gcc.dg/pr102892-2.c b/gcc/testsuite/gcc.dg/pr102892-2.c
new file mode 100644 (file)
index 0000000..b39bd6c
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr102892-2.c
@@ -0,0 +1,7 @@
+/* { dg-do compile } */
+/* { dg-options "-O3" } */
+
+void
+bar (void)
+{
+}