1 files changed, 45 insertions, 0 deletions
diff --git a/bugs/ultrixcc.c b/bugs/ultrixcc.c
new file mode 100644
index 000000000000..7ba75b140f1f
--- /dev/null
+++ b/bugs/ultrixcc.c
@@ -0,0 +1,45 @@
+#include <stdio.h>
+
+/* This is a cc optimiser bug for ultrix 4.3, mips CPU.
+ * What happens is that the compiler, due to the (a)&7,
+ * does
+ * i=a&7;
+ * i--;
+ * i*=4;
+ * Then uses i as the offset into a jump table.
+ * The problem is that a value of 0 generates an offset of
+ * 0xfffffffc.
+ */
+
+main()
+	{
+	f(5);
+	f(0);
+	}
+
+int f(a)
+int a;
+	{
+	switch(a&7)
+		{
+	case 7:
+		printf("7\n");
+	case 6:
+		printf("6\n");
+	case 5:
+		printf("5\n");
+	case 4:
+		printf("4\n");
+	case 3:
+		printf("3\n");
+	case 2:
+		printf("2\n");
+	case 1:
+		printf("1\n");
+#ifdef FIX_BUG
+	case 0:
+		;
+#endif
+		}
+	}	
+