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-rw-r--r--openssl/bugs/ultrixcc.c45
1 files changed, 45 insertions, 0 deletions
diff --git a/openssl/bugs/ultrixcc.c b/openssl/bugs/ultrixcc.c
new file mode 100644
index 000000000..7ba75b140
--- /dev/null
+++ b/openssl/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
+ }
+ }
+