1 files changed, 60 insertions, 0 deletions
diff --git a/openssl/bugs/sgiccbug.c b/openssl/bugs/sgiccbug.c
new file mode 100644
index 0000000..6b1b3d4
--- /dev/null
+++ b/openssl/bugs/sgiccbug.c
@@ -0,0 +1,60 @@
+/* NOCW */
+/* sgibug.c */
+/* bug found by Eric Young (eay@mincom.oz.au) May 95 */
+
+#include <stdio.h>
+
+/*
+ * This compiler bug it present on IRIX 5.3, 5.1 and 4.0.5 (these are the
+ * only versions of IRIX I have access to. defining FIXBUG removes the bug.
+ * (bug is still present in IRIX 6.3 according to Gage
+ * <agage@forgetmenot.Mines.EDU>
+ */
+
+/*-
+ * Compare the output from
+ * cc sgiccbug.c; ./a.out
+ * and
+ * cc -O sgiccbug.c; ./a.out
+ */
+
+static unsigned long a[4] =
+    { 0x01234567, 0x89ABCDEF, 0xFEDCBA98, 0x76543210 };
+static unsigned long b[4] =
+    { 0x89ABCDEF, 0xFEDCBA98, 0x76543210, 0x01234567 };
+static unsigned long c[4] =
+    { 0x77777778, 0x8ACF1357, 0x88888888, 0x7530ECA9 };
+
+main()
+{
+    unsigned long r[4];
+    sub(r, a, b);
+    fprintf(stderr, "input a= %08X %08X %08X %08X\n", a[3], a[2], a[1], a[0]);
+    fprintf(stderr, "input b= %08X %08X %08X %08X\n", b[3], b[2], b[1], b[0]);
+    fprintf(stderr, "output = %08X %08X %08X %08X\n", r[3], r[2], r[1], r[0]);
+    fprintf(stderr, "correct= %08X %08X %08X %08X\n", c[3], c[2], c[1], c[0]);
+}
+
+int sub(r, a, b)
+unsigned long *r, *a, *b;
+{
+    register unsigned long t1, t2, *ap, *bp, *rp;
+    int i, carry;
+#ifdef FIXBUG
+    unsigned long dummy;
+#endif
+
+    ap = a;
+    bp = b;
+    rp = r;
+    carry = 0;
+    for (i = 0; i < 4; i++) {
+        t1 = *(ap++);
+        t2 = *(bp++);
+        t1 = (t1 - t2);
+#ifdef FIXBUG
+        dummy = t1;
+#endif
+        *(rp++) = t1 & 0xffffffff;
+    }
+}