Set u randomly in loop. Perform more mpf_mul_2exp testing.

1 files changed, 20 insertions, 1 deletions

diff --git a/mpf/tests/t-dm2exp.c b/mpf/tests/t-dm2exp.c
index 48503c80b..2be9c3527 100644
--- a/mpf/tests/t-dm2exp.c
+++ b/mpf/tests/t-dm2exp.c
@@ -34,9 +34,11 @@ main (argc, argv)
 {
   int reps = 500000;
   int i;
-  mpf_t u, v, w1, w2;
+  mpf_t u, v, w1, w2, w3;
   mp_size_t bprec = 100;
   mpf_t rerr, limit_rerr;
+  mp_size_t un;
+  mp_exp_t ue;
 
   if (argc > 1)
     {
@@ -54,6 +56,7 @@ main (argc, argv)
   mpf_init (v);
   mpf_init (w1);
   mpf_init (w2);
+  mpf_init (w3);
 
   for (i = 0; i < reps; i++)
     {
@@ -63,6 +66,7 @@ main (argc, argv)
       res_prec = urandom () % (bprec + 100);
       mpf_set_prec (w1, res_prec);
       mpf_set_prec (w2, res_prec);
+      mpf_set_prec (w3, res_prec);
 
       mpf_set_ui (limit_rerr, 1);
       mpf_div_2exp (limit_rerr, limit_rerr, res_prec);
@@ -71,6 +75,10 @@ main (argc, argv)
       mpf_set_ui (v, 1);
       mpf_mul_2exp (v, v, pow2);
 
+      un = urandom () % (2 * SIZE) - SIZE;
+      ue = urandom () % SIZE;
+      mpf_random2 (u, un, ue);
+
       mpf_div_2exp (w1, u, pow2);
       mpf_div (w2, u, v);
       mpf_reldiff (rerr, w1, w2);
@@ -83,6 +91,17 @@ main (argc, argv)
 	  printf ("  w2 = "); mpf_dump (w2);
 	  abort ();
 	}
+      mpf_mul_2exp (w3, w1, pow2);
+      mpf_reldiff (rerr, u, w3);
+      if (mpf_cmp (rerr, limit_rerr) > 0)
+	{
+	  printf ("ERROR in mpf_mul_2exp after %d tests\n", i);
+	  printf ("   u = "); mpf_dump (u);
+	  printf ("   v = "); mpf_dump (v);
+	  printf ("  w1 = "); mpf_dump (w1);
+	  printf ("  w3 = "); mpf_dump (w3);
+	  abort ();
+	}
     }
 
   exit (0);