1 files changed, 46 insertions, 0 deletions
diff --git a/gcc-4.9/gcc/testsuite/gcc.dg/c90-const-expr-3.c b/gcc-4.9/gcc/testsuite/gcc.dg/c90-const-expr-3.c
new file mode 100644
index 000000000..46a022734
--- /dev/null
+++ b/gcc-4.9/gcc/testsuite/gcc.dg/c90-const-expr-3.c
@@ -0,0 +1,46 @@
+/* Test for constant expressions: broken optimization with const variables.  */
+/* Reference: ISO 9989:1990 6.5.15 */
+/* Origin: Joseph Myers <jsm28@cam.ac.uk> */
+/* { dg-do compile } */
+/* { dg-options "-std=iso9899:1990 -O2" } */
+/* Note: not using -pedantic since the -std option alone should be enough
+   to give the correct behavior to conforming programs.  */
+
+static const int ZERO = 0;
+static const double DZERO = 0;
+
+int *a;
+int b;
+long *c;
+
+/* Assertion that n is a constant zero: so the conditional expression
+   has type 'int *' instead of 'void *'.
+*/
+#define ASSERT_NPC(n)	(b = *(1 ? a : (n)))
+/* Assertion that n is not a constant zero: so the conditional
+   expressions has type 'void *' instead of 'int *'.
+*/
+#define ASSERT_NOT_NPC(n)	(c = (1 ? a : (void *)(__SIZE_TYPE__)(n)))
+
+void
+foo (void)
+{
+  ASSERT_NPC (0);
+  ASSERT_NOT_NPC (ZERO);
+  ASSERT_NPC (0 + 0);
+  ASSERT_NOT_NPC (ZERO + 0); /* { dg-bogus "incompatible" "bogus null pointer constant" } */
+  ASSERT_NOT_NPC (ZERO + ZERO); /* { dg-bogus "incompatible" "bogus null pointer constant" } */
+  ASSERT_NPC (+0);
+  ASSERT_NOT_NPC (+ZERO); /* { dg-bogus "incompatible" "bogus null pointer constant" } */
+  ASSERT_NPC (-0);
+  ASSERT_NOT_NPC (-ZERO); /* { dg-bogus "incompatible" "bogus null pointer constant" } */
+  ASSERT_NPC ((char) 0);
+  ASSERT_NOT_NPC ((char) ZERO);
+  ASSERT_NPC ((int) 0);
+  ASSERT_NOT_NPC ((int) ZERO);
+  ASSERT_NPC ((int) 0.0);
+  ASSERT_NOT_NPC ((int) DZERO);
+  ASSERT_NOT_NPC ((int) +0.0); /* { dg-bogus "incompatible" "bogus null pointer constant" } */
+  ASSERT_NOT_NPC ((int) (0.0+0.0)); /* { dg-bogus "incompatible" "bogus null pointer constant" } */
+  ASSERT_NOT_NPC ((int) (double)0.0); /* { dg-bogus "incompatible" "bogus null pointer constant" } */
+}