From 11da511c784eca003deb90c23570f0873954e0de Mon Sep 17 00:00:00 2001 From: Duncan Wilkie Date: Sat, 18 Nov 2023 06:11:09 -0600 Subject: Initial commit. --- gmp-6.3.0/tests/mpz/t-div_2exp.c | 223 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 223 insertions(+) create mode 100644 gmp-6.3.0/tests/mpz/t-div_2exp.c (limited to 'gmp-6.3.0/tests/mpz/t-div_2exp.c') diff --git a/gmp-6.3.0/tests/mpz/t-div_2exp.c b/gmp-6.3.0/tests/mpz/t-div_2exp.c new file mode 100644 index 0000000..d012aae --- /dev/null +++ b/gmp-6.3.0/tests/mpz/t-div_2exp.c @@ -0,0 +1,223 @@ +/* Test mpz_[cft]div_[qr]_2exp. + +Copyright 2001 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 +#include + +#include "gmp-impl.h" +#include "tests.h" + + +/* If the remainder is in the correct range and q*d+r is correct, then q + must have rounded correctly. */ + +void +check_one (mpz_srcptr a, unsigned long d) +{ + mpz_t q, r, p, d2exp; + int inplace; + + mpz_init (d2exp); + mpz_init (q); + mpz_init (r); + mpz_init (p); + + mpz_set_ui (d2exp, 1L); + mpz_mul_2exp (d2exp, d2exp, d); + +#define INPLACE(fun,dst,src,d) \ + if (inplace) \ + { \ + mpz_set (dst, src); \ + fun (dst, dst, d); \ + } \ + else \ + fun (dst, src, d); + + for (inplace = 0; inplace <= 1; inplace++) + { + INPLACE (mpz_fdiv_q_2exp, q, a, d); + INPLACE (mpz_fdiv_r_2exp, r, a, d); + + mpz_mul_2exp (p, q, d); + mpz_add (p, p, r); + if (mpz_sgn (r) < 0 || mpz_cmp (r, d2exp) >= 0) + { + printf ("mpz_fdiv_r_2exp result out of range\n"); + goto error; + } + if (mpz_cmp (p, a) != 0) + { + printf ("mpz_fdiv_[qr]_2exp doesn't multiply back\n"); + goto error; + } + + + INPLACE (mpz_cdiv_q_2exp, q, a, d); + INPLACE (mpz_cdiv_r_2exp, r, a, d); + + mpz_mul_2exp (p, q, d); + mpz_add (p, p, r); + if (mpz_sgn (r) > 0 || mpz_cmpabs (r, d2exp) >= 0) + { + printf ("mpz_cdiv_r_2exp result out of range\n"); + goto error; + } + if (mpz_cmp (p, a) != 0) + { + printf ("mpz_cdiv_[qr]_2exp doesn't multiply back\n"); + goto error; + } + + + INPLACE (mpz_tdiv_q_2exp, q, a, d); + INPLACE (mpz_tdiv_r_2exp, r, a, d); + + mpz_mul_2exp (p, q, d); + mpz_add (p, p, r); + if (mpz_sgn (r) != 0 && mpz_sgn (r) != mpz_sgn (a)) + { + printf ("mpz_tdiv_r_2exp result wrong sign\n"); + goto error; + } + if (mpz_cmpabs (r, d2exp) >= 0) + { + printf ("mpz_tdiv_r_2exp result out of range\n"); + goto error; + } + if (mpz_cmp (p, a) != 0) + { + printf ("mpz_tdiv_[qr]_2exp doesn't multiply back\n"); + goto error; + } + } + + mpz_clear (d2exp); + mpz_clear (q); + mpz_clear (r); + mpz_clear (p); + return; + + + error: + mpz_trace ("a", a); + printf ("d=%lu\n", d); + mpz_trace ("q", q); + mpz_trace ("r", r); + mpz_trace ("p", p); + + mp_trace_base = -16; + mpz_trace ("a", a); + printf ("d=0x%lX\n", d); + mpz_trace ("q", q); + mpz_trace ("r", r); + mpz_trace ("p", p); + + abort (); +} + + +void +check_all (mpz_ptr a, unsigned long d) +{ + check_one (a, d); + mpz_neg (a, a); + check_one (a, d); +} + + +void +check_various (void) +{ + static const unsigned long table[] = { + 0, 1, 2, 3, 4, 5, + GMP_NUMB_BITS-1, GMP_NUMB_BITS, GMP_NUMB_BITS+1, + 2*GMP_NUMB_BITS-1, 2*GMP_NUMB_BITS, 2*GMP_NUMB_BITS+1, + 3*GMP_NUMB_BITS-1, 3*GMP_NUMB_BITS, 3*GMP_NUMB_BITS+1, + 4*GMP_NUMB_BITS-1, 4*GMP_NUMB_BITS, 4*GMP_NUMB_BITS+1 + }; + + int i, j; + unsigned long n, d; + mpz_t a; + + mpz_init (a); + + /* a==0, and various d */ + mpz_set_ui (a, 0L); + for (i = 0; i < numberof (table); i++) + check_one (a, table[i]); + + /* a==2^n, and various d */ + for (i = 0; i < numberof (table); i++) + { + n = table[i]; + mpz_set_ui (a, 1L); + mpz_mul_2exp (a, a, n); + + for (j = 0; j < numberof (table); j++) + { + d = table[j]; + check_all (a, d); + } + } + + mpz_clear (a); +} + + +void +check_random (int argc, char *argv[]) +{ + gmp_randstate_ptr rands = RANDS; + int reps = 100; + mpz_t a; + unsigned long d; + int i; + + if (argc == 2) + reps = atoi (argv[1]); + + mpz_init (a); + + for (i = 0; i < reps; i++) + { + /* exponentially within 2 to 257 bits */ + mpz_erandomb (a, rands, urandom () % 8 + 2); + + d = urandom () % 256; + + check_all (a, d); + } + + mpz_clear (a); +} + + +int +main (int argc, char *argv[]) +{ + tests_start (); + + check_various (); + check_random (argc, argv); + + tests_end (); + exit (0); +} -- cgit v1.2.3