--- /dev/null
+/* Test mpz_get_d_2exp.
+
+Copyright 2002, 2003 Free Software Foundation, Inc.
+
+This file is part of the GNU MP Library.
+
+The GNU MP Library is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 3 of the License, or (at your
+option) any later version.
+
+The GNU MP Library is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
+License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include "gmp.h"
+#include "gmp-impl.h"
+#include "tests.h"
+
+
+static void
+check_onebit (void)
+{
+ static const unsigned long data[] = {
+ 1, 32, 52, 53, 54, 63, 64, 65, 128, 256, 511, 512, 513
+ };
+ mpz_t z;
+ double got, want;
+ long got_exp, want_exp;
+ int i;
+
+ mpz_init (z);
+
+ for (i = 0; i < numberof (data); i++)
+ {
+ mpz_set_ui (z, 1L);
+ mpz_mul_2exp (z, z, data[i]);
+ want = 0.5;
+ want_exp = data[i] + 1;
+ got = mpz_get_d_2exp (&got_exp, z);
+ if (got != want || got_exp != want_exp)
+ {
+ printf ("mpz_get_d_2exp wrong on 2**%ld\n", data[i]);
+ mpz_trace (" z ", z);
+ d_trace (" want ", want);
+ d_trace (" got ", got);
+ printf (" want exp %ld\n", want_exp);
+ printf (" got exp %ld\n", got_exp);
+ abort();
+ }
+
+ mpz_set_si (z, -1L);
+ mpz_mul_2exp (z, z, data[i]);
+ want = -0.5;
+ want_exp = data[i] + 1;
+ got = mpz_get_d_2exp (&got_exp, z);
+ if (got != want || got_exp != want_exp)
+ {
+ printf ("mpz_get_d_2exp wrong on -2**%ld\n", data[i]);
+ mpz_trace (" z ", z);
+ d_trace (" want ", want);
+ d_trace (" got ", got);
+ printf (" want exp %ld\n", want_exp);
+ printf (" got exp %ld\n", got_exp);
+ abort();
+ }
+ }
+ mpz_clear (z);
+}
+
+/* Check that hardware rounding doesn't make mpz_get_d_2exp return a value
+ outside its defined range. */
+static void
+check_round (void)
+{
+ static const unsigned long data[] = { 1, 32, 53, 54, 64, 128, 256, 512 };
+ mpz_t z;
+ double got;
+ long got_exp;
+ int i, rnd_mode, old_rnd_mode;
+
+ mpz_init (z);
+ old_rnd_mode = tests_hardware_getround ();
+
+ for (rnd_mode = 0; rnd_mode < 4; rnd_mode++)
+ {
+ tests_hardware_setround (rnd_mode);
+
+ for (i = 0; i < numberof (data); i++)
+ {
+ mpz_set_ui (z, 1L);
+ mpz_mul_2exp (z, z, data[i]);
+ mpz_sub_ui (z, z, 1L);
+
+ got = mpz_get_d_2exp (&got_exp, z);
+ if (got < 0.5 || got >= 1.0)
+ {
+ printf ("mpz_get_d_2exp wrong on 2**%lu-1\n", data[i]);
+ printf ("result out of range, expect 0.5 <= got < 1.0\n");
+ printf (" rnd_mode = %d\n", rnd_mode);
+ printf (" data[i] = %lu\n", data[i]);
+ mpz_trace (" z ", z);
+ d_trace (" got ", got);
+ printf (" got exp %ld\n", got_exp);
+ abort();
+ }
+
+ mpz_neg (z, z);
+ got = mpz_get_d_2exp (&got_exp, z);
+ if (got <= -1.0 || got > -0.5)
+ {
+ printf ("mpz_get_d_2exp wrong on -2**%lu-1\n", data[i]);
+ printf ("result out of range, expect -1.0 < got <= -0.5\n");
+ printf (" rnd_mode = %d\n", rnd_mode);
+ printf (" data[i] = %lu\n", data[i]);
+ mpz_trace (" z ", z);
+ d_trace (" got ", got);
+ printf (" got exp %ld\n", got_exp);
+ abort();
+ }
+ }
+ }
+
+ mpz_clear (z);
+ tests_hardware_setround (old_rnd_mode);
+}
+
+static void
+check_rand (void)
+{
+ gmp_randstate_ptr rands = RANDS;
+ int i;
+ mpz_t z;
+ double got;
+ long got_exp;
+ unsigned long bits;
+
+ mpz_init (z);
+
+ for (i = 0; i < 200; i++)
+ {
+ bits = gmp_urandomm_ui (rands, 512L);
+ mpz_urandomb (z, rands, bits);
+
+ got = mpz_get_d_2exp (&got_exp, z);
+ if (mpz_sgn (z) == 0)
+ continue;
+ bits = mpz_sizeinbase (z, 2);
+
+ if (got < 0.5 || got >= 1.0)
+ {
+ printf ("mpz_get_d_2exp out of range, expect 0.5 <= got < 1.0\n");
+ mpz_trace (" z ", z);
+ d_trace (" got ", got);
+ printf (" got exp %ld\n", got_exp);
+ abort();
+ }
+
+ /* FIXME: If mpz_get_d_2exp rounds upwards we might have got_exp ==
+ bits+1, so leave this test disabled until we decide if that's what
+ should happen, or not. */
+#if 0
+ if (got_exp != bits)
+ {
+ printf ("mpz_get_d_2exp wrong exponent\n", i);
+ mpz_trace (" z ", z);
+ d_trace (" bits ", bits);
+ d_trace (" got ", got);
+ printf (" got exp %ld\n", got_exp);
+ abort();
+ }
+#endif
+ }
+ mpz_clear (z);
+}
+
+
+int
+main (void)
+{
+ tests_start ();
+ mp_trace_base = -16;
+
+ check_onebit ();
+ check_round ();
+ check_rand ();
+
+ tests_end ();
+ exit (0);
+}
projects / msp430-gcc.git / blobdiff