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Diffstat (limited to 'math/atest-exp.c')
| -rw-r--r-- | math/atest-exp.c | 196 |
1 files changed, 0 insertions, 196 deletions
diff --git a/math/atest-exp.c b/math/atest-exp.c deleted file mode 100644 index 6029ae1fdf..0000000000 --- a/math/atest-exp.c +++ /dev/null @@ -1,196 +0,0 @@ -/* Copyright (C) 1997-2017 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Geoffrey Keating <Geoff.Keating@anu.edu.au>, 1997. - - The GNU C 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 2.1 of the License, or (at your option) any later version. - - The GNU C 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 C Library; if not, see - <http://www.gnu.org/licenses/>. */ - -#include <stdio.h> -#include <math.h> -#include <gmp.h> -#include <string.h> -#include <limits.h> -#include <assert.h> - -#define PRINT_ERRORS 0 - -#define TOL 80 -#define N2 17 -#define FRAC (32*4) - -#define mpbpl (CHAR_BIT * sizeof (mp_limb_t)) -#define SZ (FRAC / mpbpl + 1) -typedef mp_limb_t mp1[SZ], mp2[SZ * 2]; - -/* This string has 101 hex digits. */ -static const char exp1[102] = "2" /* point */ -"b7e151628aed2a6abf7158809cf4f3c762e7160f38b4da56a7" -"84d9045190cfef324e7738926cfbe5f4bf8d8d8c31d763da07"; -static const char hexdig[] = "0123456789abcdef"; - -static void -print_mpn_hex (const mp_limb_t *x, unsigned size) -{ - char value[size + 1]; - unsigned i; - const unsigned final = (size * 4 > SZ * mpbpl) ? SZ * mpbpl / 4 : size; - - memset (value, '0', size); - - for (i = 0; i < final ; i++) - value[size - 1 - i] = hexdig[x[i * 4 / mpbpl] >> (i * 4) % mpbpl & 0xf]; - - value[size] = '\0'; - fputs (value, stdout); -} - -static void -exp_mpn (mp1 ex, mp1 x) -{ - unsigned n; - mp1 xp; - mp2 tmp; - mp_limb_t chk __attribute__ ((unused)); - mp1 tol; - - memset (xp, 0, sizeof (mp1)); - memset (ex, 0, sizeof (mp1)); - xp[FRAC / mpbpl] = (mp_limb_t)1 << FRAC % mpbpl; - memset (tol,0, sizeof (mp1)); - tol[(FRAC - TOL) / mpbpl] = (mp_limb_t)1 << (FRAC - TOL) % mpbpl; - - n = 0; - - do - { - /* Calculate sum(x^n/n!) until the next term is sufficiently small. */ - - mpn_mul_n (tmp, xp, x, SZ); - assert (tmp[SZ * 2 - 1] == 0); - if (n > 0) - mpn_divmod_1 (xp, tmp + FRAC / mpbpl, SZ, n); - chk = mpn_add_n (ex, ex, xp, SZ); - assert (chk == 0); - n++; - assert (n < 80); /* Catch too-high TOL. */ - } - while (n < 10 || mpn_cmp (xp, tol, SZ) >= 0); -} - -static int -mpn_bitsize(const mp_limb_t *SRC_PTR, mp_size_t SIZE) -{ - int i, j; - for (i = SIZE - 1; i > 0; i--) - if (SRC_PTR[i] != 0) - break; - for (j = mpbpl - 1; j >= 0; j--) - if ((SRC_PTR[i] & (mp_limb_t)1 << j) != 0) - break; - - return i * mpbpl + j; -} - -static int -do_test (void) -{ - mp1 ex, x, xt, e2, e3; - int i; - int errors = 0; - int failures = 0; - mp1 maxerror; - int maxerror_s = 0; - const double sf = pow (2, mpbpl); - - /* assert (mpbpl == mp_bits_per_limb); */ - assert (FRAC / mpbpl * mpbpl == FRAC); - - memset (maxerror, 0, sizeof (mp1)); - memset (xt, 0, sizeof (mp1)); - xt[(FRAC - N2) / mpbpl] = (mp_limb_t)1 << (FRAC - N2) % mpbpl; - - for (i = 0; i < 1 << N2; i++) - { - int e2s, e3s, j; - double de2; - - mpn_mul_1 (x,xt,SZ,i); - exp_mpn (ex, x); - de2 = exp (i / (double) (1 << N2)); - for (j = SZ-1; j >= 0; j--) - { - e2[j] = (mp_limb_t) de2; - de2 = (de2 - e2[j]) * sf; - } - if (mpn_cmp (ex,e2,SZ) >= 0) - mpn_sub_n (e3,ex,e2,SZ); - else - mpn_sub_n (e3,e2,ex,SZ); - - e2s = mpn_bitsize (e2,SZ); - e3s = mpn_bitsize (e3,SZ); - if (e3s >= 0 && e2s - e3s < 54) - { -#if PRINT_ERRORS - printf ("%06x ", i * (0x100000 / (1 << N2))); - print_mpn_hex (ex, (FRAC / 4) + 1); - fputs ("\n ",stdout); - print_mpn_hex (e2, (FRAC / 4) + 1); - printf ("\n %c ", - e2s - e3s < 54 ? e2s - e3s == 53 ? 'e' : 'F' : 'P'); - print_mpn_hex (e3, (FRAC / 4) + 1); - putchar ('\n'); -#endif - errors += (e2s - e3s == 53); - failures += (e2s - e3s < 53); - } - if (e3s >= maxerror_s - && mpn_cmp (e3, maxerror, SZ) > 0) - { - memcpy (maxerror, e3, sizeof (mp1)); - maxerror_s = e3s; - } - } - - /* Check exp_mpn against precomputed value of exp(1). */ - memset (x, '\0', sizeof (mp1)); - x[FRAC / mpbpl] = (mp_limb_t)1 << FRAC % mpbpl; - exp_mpn (ex, x); - - memset (e2, '\0', sizeof (mp1)); - for (i = -1; i < 100 && i < FRAC / 4; i++) - e2[(FRAC - i * 4 - 4) / mpbpl] |= ((mp_limb_t) (strchr (hexdig, - exp1[i + 1]) - - hexdig) - << (FRAC - i * 4 - 4) % mpbpl); - - if (mpn_cmp (ex, e2, SZ) >= 0) - mpn_sub_n (e3, ex, e2, SZ); - else - mpn_sub_n (e3, e2, ex, SZ); - - printf ("%d failures; %d errors; error rate %0.2f%%\n", failures, errors, - errors * 100.0 / (double) (1 << N2)); - fputs ("maximum error: ", stdout); - print_mpn_hex (maxerror, (FRAC / 4) + 1); - fputs ("\nerror in exp(1): ", stdout); - print_mpn_hex (e3, (FRAC / 4) + 1); - putchar ('\n'); - - return failures == 0 ? 0 : 1; -} - -#define TIMEOUT 200 -#define TEST_FUNCTION do_test () -#include "../test-skeleton.c" |