diff -r 000000000000 -r 6474c204b198 security/nss/lib/freebl/mpi/mulsqr.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/security/nss/lib/freebl/mpi/mulsqr.c	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,83 @@
+/*
+ * Test whether to include squaring code given the current settings
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <limits.h>
+#include <time.h>
+
+#define MP_SQUARE 1  /* make sure squaring code is included */
+
+#include "mpi.h"
+#include "mpprime.h"
+
+int main(int argc, char *argv[])
+{
+  int           ntests, prec, ix;
+  unsigned int  seed;
+  clock_t       start, stop;
+  double        multime, sqrtime;
+  mp_int        a, c;
+
+  seed = (unsigned int)time(NULL);
+
+  if(argc < 3) {
+    fprintf(stderr, "Usage: %s <ntests> <nbits>\n", argv[0]);
+    return 1;
+  }
+
+  if((ntests = abs(atoi(argv[1]))) == 0) {
+    fprintf(stderr, "%s: must request at least 1 test.\n", argv[0]);
+    return 1;
+  }
+  if((prec = abs(atoi(argv[2]))) < CHAR_BIT) {
+    fprintf(stderr, "%s: must request at least %d bits.\n", argv[0],
+	    CHAR_BIT);
+    return 1;
+  }
+
+  prec = (prec + (DIGIT_BIT - 1)) / DIGIT_BIT;
+
+  mp_init_size(&a, prec);
+  mp_init_size(&c, 2 * prec);
+
+  /* Test multiplication by self */
+  srand(seed);
+  start = clock();
+  for(ix = 0; ix < ntests; ix++) {
+    mpp_random_size(&a, prec);
+    mp_mul(&a, &a, &c);
+  }
+  stop = clock();
+
+  multime = (double)(stop - start) / CLOCKS_PER_SEC;
+
+  /* Test squaring */
+  srand(seed);
+  start = clock();
+  for(ix = 0; ix < ntests; ix++) {
+    mpp_random_size(&a, prec);
+    mp_sqr(&a, &c);
+  }
+  stop = clock();
+
+  sqrtime = (double)(stop - start) / CLOCKS_PER_SEC;
+
+  printf("Multiply: %.4f\n", multime);
+  printf("Square:   %.4f\n", sqrtime);
+  if(multime < sqrtime) {
+    printf("Speedup:  %.1f%%\n", 100.0 * (1.0 - multime / sqrtime));
+    printf("Prefer:   multiply\n");
+  } else {
+    printf("Speedup:  %.1f%%\n", 100.0 * (1.0 - sqrtime / multime));
+    printf("Prefer:   square\n");
+  }
+
+  mp_clear(&a); mp_clear(&c);
+  return 0;
+
+}