[tests/tpow_fr.c] added test case exposing reuse bug (I don't know how to enter

		  such a test in pow_fr.dat)
[src/pow.c] fixed corresponding bug


git-svn-id: svn://scm.gforge.inria.fr/svn/mpc/trunk@1088 211d60ee-9f03-0410-a15a-8952a2c7a4e4

1 files changed, 28 insertions, 0 deletions

diff --git a/tests/tpow_fr.c b/tests/tpow_fr.c
index bccc093..d9968a8 100644
--- a/tests/tpow_fr.c
+++ b/tests/tpow_fr.c
@@ -20,12 +20,40 @@ along with this program. If not, see http://www.gnu.org/licenses/ .
 
 #include "mpc-tests.h"
 
+static void
+test_reuse (void)
+{
+  mpc_t z;
+  mpfr_t y;
+  int inex;
+
+  mpfr_init2 (y, 2);
+  mpc_init2 (z, 2);
+  mpc_set_si_si (z, 0, -1, MPC_RNDNN);
+  mpfr_neg (mpc_realref (z), mpc_realref (z), GMP_RNDN);
+  mpc_div_2exp (z, z, 4, MPC_RNDNN);
+  mpfr_set_ui (y, 512, GMP_RNDN);
+  inex = mpc_pow_fr (z, z, y, MPC_RNDNN);
+  if (MPC_INEX_RE(inex) != 0 || MPC_INEX_IM(inex) != 0 ||
+      mpfr_cmp_ui_2exp (MPC_RE(z), 1, -2048) != 0 ||
+      mpfr_cmp_ui (MPC_IM(z), 0) != 0 || mpfr_signbit (MPC_IM(z)) == 0)
+    {
+      printf ("Error in test_reuse, wrong ternary value or output\n");
+      printf ("inex=(%d %d)\n", MPC_INEX_RE(inex), MPC_INEX_IM(inex));
+      printf ("z="); mpc_out_str (stdout, 2, 0, z, MPC_RNDNN); printf ("\n");
+      exit (1);
+    }
+  mpfr_clear (y);
+  mpc_clear (z);
+}
+
 int
 main (void)
 {
   DECL_FUNC (CCF, f, mpc_pow_fr);
   test_start ();
 
+  test_reuse ();
   data_check (f, "pow_fr.dat");
   tgeneric (f, 2, 1024, 7, 10);