1 files changed, 58 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/strlenopt-92.c b/gcc/testsuite/gcc.dg/strlenopt-92.c
new file mode 100644
index 0000000..a9383e6
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/strlenopt-92.c
@@ -0,0 +1,58 @@
+/* PR tree-optimization/92765 - wrong code for strcmp of a union member
+   { dg-do run }
+   { dg-options "-O2 -Wall" } */
+
+#include "strlenopt.h"
+
+__attribute__((noipa)) int
+copy (char *x, int y)
+{
+  if (y == 0)
+    strcpy (x, "abcd");
+  return y;
+}
+
+__attribute__((noipa)) char *
+alloc_2_copy_compare (int x)
+{
+  char *p;
+  if (x)
+    p = malloc (4);
+  else
+    p = calloc (16, 1);
+
+  char *q = p + 2;
+  if (copy (q, x))
+    return p;
+
+  if (strcmp (q, "abcd") != 0)
+    abort ();
+
+  return p;
+}
+
+char a5[5], a6[6], a7[7];
+
+__attribute__((noipa)) char *
+decl_3_copy_compare (int x)
+{
+  char *p = x < 0 ? a5 : 0 < x ? a6 : a7;
+  char *q = p + 1;
+  if (copy (q, x))
+    return p;
+
+  if (strcmp (q, "abcd") != 0)
+    abort ();
+
+  return p;
+}
+
+int main ()
+{
+  free (alloc_2_copy_compare (0));
+  free (alloc_2_copy_compare (1));
+
+  decl_3_copy_compare (-1);
+  decl_3_copy_compare (0);
+  decl_3_copy_compare (1);
+}