diff options
author | Thomas Voss <mail@thomasvoss.com> | 2024-06-21 23:36:36 +0200 |
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committer | Thomas Voss <mail@thomasvoss.com> | 2024-06-21 23:42:26 +0200 |
commit | a89a14ef5da44684a16b204e7a70460cc8c4922a (patch) | |
tree | b23b4c6b155977909ef508fdae2f48d33d802813 /vendor/gmp-6.3.0/tests/mpf/t-sqrt_ui.c | |
parent | 1db63fcedab0b288820d66e100b1877b1a5a8851 (diff) |
Basic constant folding implementation
Diffstat (limited to 'vendor/gmp-6.3.0/tests/mpf/t-sqrt_ui.c')
-rw-r--r-- | vendor/gmp-6.3.0/tests/mpf/t-sqrt_ui.c | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/vendor/gmp-6.3.0/tests/mpf/t-sqrt_ui.c b/vendor/gmp-6.3.0/tests/mpf/t-sqrt_ui.c new file mode 100644 index 0000000..31c587f --- /dev/null +++ b/vendor/gmp-6.3.0/tests/mpf/t-sqrt_ui.c @@ -0,0 +1,125 @@ +/* Test mpf_sqrt_ui. + +Copyright 2004, 2015 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 <stdio.h> +#include <stdlib.h> + +#include "gmp-impl.h" +#include "tests.h" + + +void +check_rand (void) +{ + unsigned long max_prec = 15; + unsigned long min_prec = __GMPF_BITS_TO_PREC (1); + gmp_randstate_ptr rands = RANDS; + unsigned long x, prec; + mpf_t r, s; + int i; + + mpf_init (r); + mpf_init (s); + refmpf_set_prec_limbs (s, 2*max_prec+10); + + for (x = 0; x < 2; x++) + { + mpf_sqrt_ui (r, x); + MPF_CHECK_FORMAT (r); + if (mpf_cmp_ui (r, x) != 0) + { + printf ("mpf_sqrt_ui wrong for special case:\n"); + printf (" x=%lu\n", x); + mpf_trace (" r", r); + abort (); + } + } + + for (i = 0; i < 50; i++) + { + /* input, a random non-zero ulong, exponentially distributed */ + do { + x = gmp_urandomb_ui (rands, + gmp_urandomm_ui (rands, BITS_PER_ULONG) + 1); + } while (x <= 1); + + /* result precision */ + prec = gmp_urandomm_ui (rands, max_prec-min_prec) + min_prec; + refmpf_set_prec_limbs (r, prec); + + mpf_sqrt_ui (r, x); + MPF_CHECK_FORMAT (r); + + /* Expect to prec limbs of result. + In the current implementation there's no stripping of low zero + limbs in mpf_sqrt_ui, not even on perfect squares, so size should + be exactly prec. */ + if (SIZ(r) != prec) + { + printf ("mpf_sqrt_ui result not enough result limbs\n"); + printf (" x=%lu\n", x); + printf (" want prec=%lu\n", prec); + mpf_trace (" r", r); + printf (" r size %ld\n", (long) SIZ(r)); + printf (" r prec %ld\n", (long) PREC(r)); + abort (); + } + + /* Must have r^2 <= x, since r has been truncated. */ + mpf_mul (s, r, r); + if (! (mpf_cmp_ui (s, x) <= 0)) + { + printf ("mpf_sqrt_ui result too big\n"); + printf (" x=%lu\n", x); + printf (" want prec=%lu\n", prec); + mpf_trace (" r", r); + mpf_trace (" s", s); + abort (); + } + + /* Must have (r+ulp)^2 > x. + No overflow from refmpf_add_ulp since r is only prec limbs. */ + refmpf_add_ulp (r); + mpf_mul (s, r, r); + if (! (mpf_cmp_ui (s, x) > 0)) + { + printf ("mpf_sqrt_ui result too small\n"); + printf (" x=%lu\n", x); + printf (" want prec=%lu\n", prec); + mpf_trace (" r+ulp", r); + mpf_trace (" s", s); + abort (); + } + } + + mpf_clear (r); + mpf_clear (s); +} + +int +main (int argc, char **argv) +{ + tests_start (); + mp_trace_base = -16; + + check_rand (); + + tests_end (); + exit (0); +} |