--- /dev/null
+/* Test mpz_cmp_d and mpz_cmpabs_d.
+
+Copyright 2001, 2002, 2003, 2005 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 <string.h>
+
+#include "gmp.h"
+#include "gmp-impl.h"
+#include "tests.h"
+
+
+/* FIXME: Not sure if the tests here are exhaustive. Ought to try to get
+ each possible exit from mpz_cmp_d (and mpz_cmpabs_d) exercised. */
+
+
+#define SGN(n) ((n) > 0 ? 1 : (n) < 0 ? -1 : 0)
+
+
+void
+check_one (const char *name, mpz_srcptr x, double y, int cmp, int cmpabs)
+{
+ int got;
+
+ got = mpz_cmp_d (x, y);
+ if (SGN(got) != cmp)
+ {
+ int i;
+ printf ("mpz_cmp_d wrong (from %s)\n", name);
+ printf (" got %d\n", got);
+ printf (" want %d\n", cmp);
+ fail:
+ mpz_trace (" x", x);
+ printf (" y %g\n", y);
+ mp_trace_base=-16;
+ mpz_trace (" x", x);
+ printf (" y %g\n", y);
+ printf (" y");
+ for (i = 0; i < sizeof(y); i++)
+ printf (" %02X", (unsigned) ((unsigned char *) &y)[i]);
+ printf ("\n");
+ abort ();
+ }
+
+ got = mpz_cmpabs_d (x, y);
+ if (SGN(got) != cmpabs)
+ {
+ printf ("mpz_cmpabs_d wrong\n");
+ printf (" got %d\n", got);
+ printf (" want %d\n", cmpabs);
+ goto fail;
+ }
+}
+
+
+void
+check_data (void)
+{
+ static const struct {
+ const char *x;
+ double y;
+ int cmp, cmpabs;
+
+ } data[] = {
+
+ { "0", 0.0, 0, 0 },
+
+ { "1", 0.0, 1, 1 },
+ { "-1", 0.0, -1, 1 },
+
+ { "0", 1.0, -1, -1 },
+ { "0", -1.0, 1, -1 },
+
+ { "0x1000000000000000000000000000000000000000000000000", 0.0, 1, 1 },
+ { "-0x1000000000000000000000000000000000000000000000000", 0.0, -1, 1 },
+
+ { "0", 1e100, -1, -1 },
+ { "0", -1e100, 1, -1 },
+
+ { "2", 1.5, 1, 1 },
+ { "2", -1.5, 1, 1 },
+ { "-2", 1.5, -1, 1 },
+ { "-2", -1.5, -1, 1 },
+ };
+
+ mpz_t x;
+ int i;
+
+ mpz_init (x);
+
+ for (i = 0; i < numberof (data); i++)
+ {
+ mpz_set_str_or_abort (x, data[i].x, 0);
+ check_one ("check_data", x, data[i].y, data[i].cmp, data[i].cmpabs);
+ }
+
+ mpz_clear (x);
+}
+
+
+/* Equality of integers with up to 53 bits */
+void
+check_onebits (void)
+{
+ mpz_t x, x2;
+ double y;
+ int i;
+
+ mpz_init_set_ui (x, 0L);
+ mpz_init (x2);
+
+ for (i = 0; i < 512; i++)
+ {
+ mpz_mul_2exp (x, x, 1);
+ mpz_add_ui (x, x, 1L);
+
+ y = mpz_get_d (x);
+ mpz_set_d (x2, y);
+
+ /* stop if any truncation is occurring */
+ if (mpz_cmp (x, x2) != 0)
+ break;
+
+ check_one ("check_onebits", x, y, 0, 0);
+ check_one ("check_onebits", x, -y, 1, 0);
+ mpz_neg (x, x);
+ check_one ("check_onebits", x, y, -1, 0);
+ check_one ("check_onebits", x, -y, 0, 0);
+ mpz_neg (x, x);
+ }
+
+ mpz_clear (x);
+ mpz_clear (x2);
+}
+
+
+/* With the mpz differing by 1, in a limb position possibly below the double */
+void
+check_low_z_one (void)
+{
+ mpz_t x;
+ double y;
+ unsigned long i;
+
+ mpz_init (x);
+
+ /* FIXME: It'd be better to base this on the float format. */
+#ifdef __vax
+#define LIM 127 /* vax fp numbers have limited range */
+#else
+#define LIM 512
+#endif
+
+ for (i = 1; i < LIM; i++)
+ {
+ mpz_set_ui (x, 1L);
+ mpz_mul_2exp (x, x, i);
+ y = mpz_get_d (x);
+
+ check_one ("check_low_z_one", x, y, 0, 0);
+ check_one ("check_low_z_one", x, -y, 1, 0);
+ mpz_neg (x, x);
+ check_one ("check_low_z_one", x, y, -1, 0);
+ check_one ("check_low_z_one", x, -y, 0, 0);
+ mpz_neg (x, x);
+
+ mpz_sub_ui (x, x, 1);
+
+ check_one ("check_low_z_one", x, y, -1, -1);
+ check_one ("check_low_z_one", x, -y, 1, -1);
+ mpz_neg (x, x);
+ check_one ("check_low_z_one", x, y, -1, -1);
+ check_one ("check_low_z_one", x, -y, 1, -1);
+ mpz_neg (x, x);
+
+ mpz_add_ui (x, x, 2);
+
+ check_one ("check_low_z_one", x, y, 1, 1);
+ check_one ("check_low_z_one", x, -y, 1, 1);
+ mpz_neg (x, x);
+ check_one ("check_low_z_one", x, y, -1, 1);
+ check_one ("check_low_z_one", x, -y, -1, 1);
+ mpz_neg (x, x);
+ }
+
+ mpz_clear (x);
+}
+
+/* Comparing 1 and 1+2^-n. "y" is volatile to make gcc store and fetch it,
+ which forces it to a 64-bit double, whereas on x86 it would otherwise
+ remain on the float stack as an 80-bit long double. */
+void
+check_one_2exp (void)
+{
+ double e;
+ mpz_t x;
+ volatile double y;
+ int i;
+
+ mpz_init (x);
+
+ e = 1.0;
+ for (i = 0; i < 128; i++)
+ {
+ e /= 2.0;
+ y = 1.0 + e;
+ if (y == 1.0)
+ break;
+
+ mpz_set_ui (x, 1L);
+ check_one ("check_one_2exp", x, y, -1, -1);
+ check_one ("check_one_2exp", x, -y, 1, -1);
+
+ mpz_set_si (x, -1L);
+ check_one ("check_one_2exp", x, y, -1, -1);
+ check_one ("check_one_2exp", x, -y, 1, -1);
+ }
+
+ mpz_clear (x);
+}
+
+void
+check_infinity (void)
+{
+ mpz_t x;
+ double y = tests_infinity_d ();
+ if (y == 0.0)
+ return;
+
+ mpz_init (x);
+
+ /* 0 cmp inf */
+ mpz_set_ui (x, 0L);
+ check_one ("check_infinity", x, y, -1, -1);
+ check_one ("check_infinity", x, -y, 1, -1);
+
+ /* 123 cmp inf */
+ mpz_set_ui (x, 123L);
+ check_one ("check_infinity", x, y, -1, -1);
+ check_one ("check_infinity", x, -y, 1, -1);
+
+ /* -123 cmp inf */
+ mpz_set_si (x, -123L);
+ check_one ("check_infinity", x, y, -1, -1);
+ check_one ("check_infinity", x, -y, 1, -1);
+
+ /* 2^5000 cmp inf */
+ mpz_set_ui (x, 1L);
+ mpz_mul_2exp (x, x, 5000L);
+ check_one ("check_infinity", x, y, -1, -1);
+ check_one ("check_infinity", x, -y, 1, -1);
+
+ /* -2^5000 cmp inf */
+ mpz_neg (x, x);
+ check_one ("check_infinity", x, y, -1, -1);
+ check_one ("check_infinity", x, -y, 1, -1);
+
+ mpz_clear (x);
+}
+
+int
+main (int argc, char *argv[])
+{
+ tests_start ();
+
+ check_data ();
+ check_onebits ();
+ check_low_z_one ();
+ check_one_2exp ();
+ check_infinity ();
+
+ tests_end ();
+ exit (0);
+}
projects / msp430-gcc.git / blobdiff