aboutsummaryrefslogtreecommitdiff
path: root/gmp-6.3.0/tests/mpn/t-get_d.c
diff options
context:
space:
mode:
Diffstat (limited to 'gmp-6.3.0/tests/mpn/t-get_d.c')
-rw-r--r--gmp-6.3.0/tests/mpn/t-get_d.c497
1 files changed, 497 insertions, 0 deletions
diff --git a/gmp-6.3.0/tests/mpn/t-get_d.c b/gmp-6.3.0/tests/mpn/t-get_d.c
new file mode 100644
index 0000000..ab0e2ec
--- /dev/null
+++ b/gmp-6.3.0/tests/mpn/t-get_d.c
@@ -0,0 +1,497 @@
+/* Test mpn_get_d.
+
+Copyright 2002-2004 Free Software Foundation, Inc.
+
+This file is part of the GNU MP Library test suite.
+
+The GNU MP Library test suite is free software; you can redistribute it
+and/or modify it under the terms of the GNU 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 test suite 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 General
+Public License for more details.
+
+You should have received a copy of the GNU General Public License along with
+the GNU MP Library test suite. If not, see https://www.gnu.org/licenses/. */
+
+#include "config.h"
+
+#include <setjmp.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "gmp-impl.h"
+#include "tests.h"
+
+
+#ifndef _GMP_IEEE_FLOATS
+#define _GMP_IEEE_FLOATS 0
+#endif
+
+
+/* Exercise various 2^n values, with various exponents and positive and
+ negative. */
+void
+check_onebit (void)
+{
+ static const int bit_table[] = {
+ 0, 1, 2, 3,
+ GMP_NUMB_BITS - 2, GMP_NUMB_BITS - 1,
+ GMP_NUMB_BITS,
+ GMP_NUMB_BITS + 1, GMP_NUMB_BITS + 2,
+ 2 * GMP_NUMB_BITS - 2, 2 * GMP_NUMB_BITS - 1,
+ 2 * GMP_NUMB_BITS,
+ 2 * GMP_NUMB_BITS + 1, 2 * GMP_NUMB_BITS + 2,
+ 3 * GMP_NUMB_BITS - 2, 3 * GMP_NUMB_BITS - 1,
+ 3 * GMP_NUMB_BITS,
+ 3 * GMP_NUMB_BITS + 1, 3 * GMP_NUMB_BITS + 2,
+ 4 * GMP_NUMB_BITS - 2, 4 * GMP_NUMB_BITS - 1,
+ 4 * GMP_NUMB_BITS,
+ 4 * GMP_NUMB_BITS + 1, 4 * GMP_NUMB_BITS + 2,
+ 5 * GMP_NUMB_BITS - 2, 5 * GMP_NUMB_BITS - 1,
+ 5 * GMP_NUMB_BITS,
+ 5 * GMP_NUMB_BITS + 1, 5 * GMP_NUMB_BITS + 2,
+ 6 * GMP_NUMB_BITS - 2, 6 * GMP_NUMB_BITS - 1,
+ 6 * GMP_NUMB_BITS,
+ 6 * GMP_NUMB_BITS + 1, 6 * GMP_NUMB_BITS + 2,
+ };
+ static const int exp_table[] = {
+ 0, -100, -10, -1, 1, 10, 100,
+ };
+
+ /* FIXME: It'd be better to base this on the float format. */
+#if defined (__vax) || defined (__vax__)
+ int limit = 127; /* vax fp numbers have limited range */
+#else
+ int limit = 511;
+#endif
+
+ int bit_i, exp_i, i;
+ double got, want;
+ mp_size_t nsize, sign;
+ long bit, exp, want_bit;
+ mp_limb_t np[20];
+
+ for (bit_i = 0; bit_i < numberof (bit_table); bit_i++)
+ {
+ bit = bit_table[bit_i];
+
+ nsize = BITS_TO_LIMBS (bit+1);
+ refmpn_zero (np, nsize);
+ np[bit/GMP_NUMB_BITS] = CNST_LIMB(1) << (bit % GMP_NUMB_BITS);
+
+ for (exp_i = 0; exp_i < numberof (exp_table); exp_i++)
+ {
+ exp = exp_table[exp_i];
+
+ want_bit = bit + exp;
+ if (want_bit >= limit || want_bit <= -limit)
+ continue;
+
+ want = 1.0;
+ for (i = 0; i < want_bit; i++)
+ want *= 2.0;
+ for (i = 0; i > want_bit; i--)
+ want *= 0.5;
+
+ for (sign = 0; sign >= -1; sign--, want = -want)
+ {
+ got = mpn_get_d (np, nsize, sign, exp);
+ if (got != want)
+ {
+ printf ("mpn_get_d wrong on 2^n\n");
+ printf (" bit %ld\n", bit);
+ printf (" exp %ld\n", exp);
+ printf (" want_bit %ld\n", want_bit);
+ printf (" sign %ld\n", (long) sign);
+ mpn_trace (" n ", np, nsize);
+ printf (" nsize %ld\n", (long) nsize);
+ d_trace (" want ", want);
+ d_trace (" got ", got);
+ abort();
+ }
+ }
+ }
+ }
+}
+
+
+/* Exercise values 2^n+1, while such a value fits the mantissa of a double. */
+void
+check_twobit (void)
+{
+ int i, mant_bits;
+ double got, want;
+ mp_size_t nsize, sign;
+ mp_ptr np;
+
+ mant_bits = tests_dbl_mant_bits ();
+ if (mant_bits == 0)
+ return;
+
+ np = refmpn_malloc_limbs (BITS_TO_LIMBS (mant_bits));
+ want = 3.0;
+ for (i = 1; i < mant_bits; i++)
+ {
+ nsize = BITS_TO_LIMBS (i+1);
+ refmpn_zero (np, nsize);
+ np[i/GMP_NUMB_BITS] = CNST_LIMB(1) << (i % GMP_NUMB_BITS);
+ np[0] |= 1;
+
+ for (sign = 0; sign >= -1; sign--)
+ {
+ got = mpn_get_d (np, nsize, sign, 0);
+ if (got != want)
+ {
+ printf ("mpn_get_d wrong on 2^%d + 1\n", i);
+ printf (" sign %ld\n", (long) sign);
+ mpn_trace (" n ", np, nsize);
+ printf (" nsize %ld\n", (long) nsize);
+ d_trace (" want ", want);
+ d_trace (" got ", got);
+ abort();
+ }
+ want = -want;
+ }
+
+ want = 2.0 * want - 1.0;
+ }
+
+ free (np);
+}
+
+
+/* Expect large negative exponents to underflow to 0.0.
+ Some systems might have hardware traps for such an underflow (though
+ usually it's not the default), so watch out for SIGFPE. */
+void
+check_underflow (void)
+{
+ static const long exp_table[] = {
+ -999999L, LONG_MIN,
+ };
+ static const mp_limb_t np[1] = { 1 };
+
+ static long exp;
+ mp_size_t nsize, sign;
+ double got;
+ int exp_i;
+
+ nsize = numberof (np);
+
+ if (tests_setjmp_sigfpe() == 0)
+ {
+ for (exp_i = 0; exp_i < numberof (exp_table); exp_i++)
+ {
+ exp = exp_table[exp_i];
+
+ for (sign = 0; sign >= -1; sign--)
+ {
+ got = mpn_get_d (np, nsize, sign, exp);
+ if (got != 0.0)
+ {
+ printf ("mpn_get_d wrong, didn't get 0.0 on underflow\n");
+ printf (" nsize %ld\n", (long) nsize);
+ printf (" exp %ld\n", exp);
+ printf (" sign %ld\n", (long) sign);
+ d_trace (" got ", got);
+ abort ();
+ }
+ }
+ }
+ }
+ else
+ {
+ printf ("Warning, underflow to zero tests skipped due to SIGFPE (exp=%ld)\n", exp);
+ }
+ tests_sigfpe_done ();
+}
+
+
+/* Expect large values to result in +/-inf, on IEEE systems. */
+void
+check_inf (void)
+{
+ static const long exp_table[] = {
+ 999999L, LONG_MAX,
+ };
+ static const mp_limb_t np[4] = { 1, 1, 1, 1 };
+ long exp;
+ mp_size_t nsize, sign, got_sign;
+ double got;
+ int exp_i;
+
+ if (! _GMP_IEEE_FLOATS)
+ return;
+
+ for (nsize = 1; nsize <= numberof (np); nsize++)
+ {
+ for (exp_i = 0; exp_i < numberof (exp_table); exp_i++)
+ {
+ exp = exp_table[exp_i];
+
+ for (sign = 0; sign >= -1; sign--)
+ {
+ got = mpn_get_d (np, nsize, sign, exp);
+ got_sign = (got >= 0 ? 0 : -1);
+ if (! tests_isinf (got))
+ {
+ printf ("mpn_get_d wrong, didn't get infinity\n");
+ bad:
+ printf (" nsize %ld\n", (long) nsize);
+ printf (" exp %ld\n", exp);
+ printf (" sign %ld\n", (long) sign);
+ d_trace (" got ", got);
+ printf (" got sign %ld\n", (long) got_sign);
+ abort ();
+ }
+ if (got_sign != sign)
+ {
+ printf ("mpn_get_d wrong sign on infinity\n");
+ goto bad;
+ }
+ }
+ }
+ }
+}
+
+/* Check values 2^n approaching and into IEEE denorm range.
+ Some systems might not support denorms, or might have traps setup, so
+ watch out for SIGFPE. */
+void
+check_ieee_denorm (void)
+{
+ static long exp;
+ mp_limb_t n = 1;
+ long i;
+ mp_size_t sign;
+ double want, got;
+
+ if (! _GMP_IEEE_FLOATS)
+ return;
+
+ if (tests_setjmp_sigfpe() == 0)
+ {
+ exp = -1020;
+ want = 1.0;
+ for (i = 0; i > exp; i--)
+ want *= 0.5;
+
+ for ( ; exp > -1500 && want != 0.0; exp--)
+ {
+ for (sign = 0; sign >= -1; sign--)
+ {
+ got = mpn_get_d (&n, (mp_size_t) 1, sign, exp);
+ if (got != want)
+ {
+ printf ("mpn_get_d wrong on denorm\n");
+ printf (" n=1\n");
+ printf (" exp %ld\n", exp);
+ printf (" sign %ld\n", (long) sign);
+ d_trace (" got ", got);
+ d_trace (" want ", want);
+ abort ();
+ }
+ want = -want;
+ }
+ want *= 0.5;
+ FORCE_DOUBLE (want);
+ }
+ }
+ else
+ {
+ printf ("Warning, IEEE denorm tests skipped due to SIGFPE (exp=%ld)\n", exp);
+ }
+ tests_sigfpe_done ();
+}
+
+
+/* Check values 2^n approaching exponent overflow.
+ Some systems might trap on overflow, so watch out for SIGFPE. */
+void
+check_ieee_overflow (void)
+{
+ static long exp;
+ mp_limb_t n = 1;
+ long i;
+ mp_size_t sign;
+ double want, got;
+
+ if (! _GMP_IEEE_FLOATS)
+ return;
+
+ if (tests_setjmp_sigfpe() == 0)
+ {
+ exp = 1010;
+ want = 1.0;
+ for (i = 0; i < exp; i++)
+ want *= 2.0;
+
+ for ( ; exp < 1050; exp++)
+ {
+ for (sign = 0; sign >= -1; sign--)
+ {
+ got = mpn_get_d (&n, (mp_size_t) 1, sign, exp);
+ if (got != want)
+ {
+ printf ("mpn_get_d wrong on overflow\n");
+ printf (" n=1\n");
+ printf (" exp %ld\n", exp);
+ printf (" sign %ld\n", (long) sign);
+ d_trace (" got ", got);
+ d_trace (" want ", want);
+ abort ();
+ }
+ want = -want;
+ }
+ want *= 2.0;
+ FORCE_DOUBLE (want);
+ }
+ }
+ else
+ {
+ printf ("Warning, IEEE overflow tests skipped due to SIGFPE (exp=%ld)\n", exp);
+ }
+ tests_sigfpe_done ();
+}
+
+
+/* ARM gcc 2.95.4 was seen generating bad code for ulong->double
+ conversions, resulting in for instance 0x81c25113 incorrectly converted.
+ This test exercises that value, to see mpn_get_d has avoided the
+ problem. */
+void
+check_0x81c25113 (void)
+{
+#if GMP_NUMB_BITS >= 32
+ double want = 2176995603.0;
+ double got;
+ mp_limb_t np[4];
+ mp_size_t nsize;
+ long exp;
+
+ if (tests_dbl_mant_bits() < 32)
+ return;
+
+ for (nsize = 1; nsize <= numberof (np); nsize++)
+ {
+ refmpn_zero (np, nsize-1);
+ np[nsize-1] = CNST_LIMB(0x81c25113);
+ exp = - (nsize-1) * GMP_NUMB_BITS;
+ got = mpn_get_d (np, nsize, (mp_size_t) 0, exp);
+ if (got != want)
+ {
+ printf ("mpn_get_d wrong on 2176995603 (0x81c25113)\n");
+ printf (" nsize %ld\n", (long) nsize);
+ printf (" exp %ld\n", exp);
+ d_trace (" got ", got);
+ d_trace (" want ", want);
+ abort ();
+ }
+ }
+#endif
+}
+
+
+void
+check_rand (void)
+{
+ gmp_randstate_ptr rands = RANDS;
+ int rep, i;
+ unsigned long mant_bits;
+ long exp, exp_min, exp_max;
+ double got, want, d;
+ mp_size_t nalloc, nsize, sign;
+ mp_limb_t nhigh_mask;
+ mp_ptr np;
+
+ mant_bits = tests_dbl_mant_bits ();
+ if (mant_bits == 0)
+ return;
+
+ /* Allow for vax D format with exponent 127 to -128 only.
+ FIXME: Do something to probe for a valid exponent range. */
+ exp_min = -100 - mant_bits;
+ exp_max = 100 - mant_bits;
+
+ /* space for mant_bits */
+ nalloc = BITS_TO_LIMBS (mant_bits);
+ np = refmpn_malloc_limbs (nalloc);
+ nhigh_mask = MP_LIMB_T_MAX
+ >> (GMP_NAIL_BITS + nalloc * GMP_NUMB_BITS - mant_bits);
+
+ for (rep = 0; rep < 200; rep++)
+ {
+ /* random exp_min to exp_max, inclusive */
+ exp = exp_min + (long) gmp_urandomm_ui (rands, exp_max - exp_min + 1);
+
+ /* mant_bits worth of random at np */
+ if (rep & 1)
+ mpn_random (np, nalloc);
+ else
+ mpn_random2 (np, nalloc);
+ nsize = nalloc;
+ np[nsize-1] &= nhigh_mask;
+ MPN_NORMALIZE (np, nsize);
+ if (nsize == 0)
+ continue;
+
+ sign = (mp_size_t) gmp_urandomb_ui (rands, 1L) - 1;
+
+ /* want = {np,nsize}, converting one bit at a time */
+ want = 0.0;
+ for (i = 0, d = 1.0; i < mant_bits; i++, d *= 2.0)
+ if (np[i/GMP_NUMB_BITS] & (CNST_LIMB(1) << (i%GMP_NUMB_BITS)))
+ want += d;
+ if (sign < 0)
+ want = -want;
+
+ /* want = want * 2^exp */
+ for (i = 0; i < exp; i++)
+ want *= 2.0;
+ for (i = 0; i > exp; i--)
+ want *= 0.5;
+
+ got = mpn_get_d (np, nsize, sign, exp);
+
+ if (got != want)
+ {
+ printf ("mpn_get_d wrong on random data\n");
+ printf (" sign %ld\n", (long) sign);
+ mpn_trace (" n ", np, nsize);
+ printf (" nsize %ld\n", (long) nsize);
+ printf (" exp %ld\n", exp);
+ d_trace (" want ", want);
+ d_trace (" got ", got);
+ abort();
+ }
+ }
+
+ free (np);
+}
+
+
+int
+main (void)
+{
+ tests_start ();
+ mp_trace_base = -16;
+
+ check_onebit ();
+ check_twobit ();
+ check_inf ();
+ check_underflow ();
+ check_ieee_denorm ();
+ check_ieee_overflow ();
+ check_0x81c25113 ();
+#if ! (defined (__vax) || defined (__vax__))
+ check_rand ();
+#endif
+
+ tests_end ();
+ exit (0);
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-09-19 16:59:56 +0000