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/mpf/t-get_d_2exp.c | 136 +++++++++++++++++++++++++++++++++++++ 1 file changed, 136 insertions(+) create mode 100644 gmp-6.3.0/tests/mpf/t-get_d_2exp.c (limited to 'gmp-6.3.0/tests/mpf/t-get_d_2exp.c') diff --git a/gmp-6.3.0/tests/mpf/t-get_d_2exp.c b/gmp-6.3.0/tests/mpf/t-get_d_2exp.c new file mode 100644 index 0000000..b716cf8 --- /dev/null +++ b/gmp-6.3.0/tests/mpf/t-get_d_2exp.c @@ -0,0 +1,136 @@ +/* Test mpf_get_d_2exp. + +Copyright 2002, 2003, 2017, 2020 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" + + +static void +check_data (void) +{ + mpf_t f; + double got, want; + long got_exp; + long exp; + struct { + int base; + int shift; + } data[] = { + {-1, 1}, {-3, 2}, {-5, 3}, {-7, 3}, { 1, 1}, { 3, 2}, { 5, 3}, { 7, 3} + }; + + mpf_init2 (f, 3); + + got = mpf_get_d_2exp (&got_exp, f); + if (got != 0 || got_exp != 0) + { + printf ("mpf_get_d_2exp wrong on zero\n"); + mpf_trace (" f ", f); + d_trace (" got ", got); + printf (" got exp %ld\n", got_exp); + abort(); + } + + for (exp = -513; exp <= 513; exp++) + { + size_t i; + for (i = 0; i < numberof (data); i++) + { + want = (double) data[i].base / (1 << data[i].shift); + mpf_set_d (f, want); + + if (exp >= 0) + mpf_mul_2exp (f, f, exp); + else + mpf_div_2exp (f, f, -exp); + + got = mpf_get_d_2exp (&got_exp, f); + if (got != want || got_exp != exp) + { + printf ("mpf_get_d_2exp wrong on 2**%ld\n", exp); + mpf_trace (" f ", f); + d_trace (" want ", want); + d_trace (" got ", got); + printf (" want exp %ld\n", exp); + printf (" got exp %ld\n", got_exp); + abort(); + } + } + } + mpf_clear (f); +} + +/* Check that hardware rounding doesn't make mpf_get_d_2exp return a value + outside its defined range. */ +static void +check_round (void) +{ + static const unsigned long data[] = { 1, 32, 53, 54, 64, 128, 256, 512 }; + mpf_t f; + double got; + long got_exp; + int i, rnd_mode, old_rnd_mode; + + mpf_init2 (f, 1024L); + old_rnd_mode = tests_hardware_getround (); + + for (rnd_mode = 0; rnd_mode < 4; rnd_mode++) + { + tests_hardware_setround (rnd_mode); + + for (i = 0; i < numberof (data); i++) + { + mpf_set_ui (f, 1L); + mpf_mul_2exp (f, f, data[i]); + mpf_sub_ui (f, f, 1L); + + got = mpf_get_d_2exp (&got_exp, f); + if (got < 0.5 || got >= 1.0) + { + printf ("mpf_get_d_2exp bad on 2**%lu-1\n", data[i]); + printf ("result out of range, expect 0.5 <= got < 1.0\n"); + printf (" rnd_mode = %d\n", rnd_mode); + printf (" data[i] = %lu\n", data[i]); + mpf_trace (" f ", f); + d_trace (" got ", got); + printf (" got exp %ld\n", got_exp); + abort(); + } + } + } + + mpf_clear (f); + tests_hardware_setround (old_rnd_mode); +} + + +int +main (void) +{ + tests_start (); + mp_trace_base = 16; + + check_data (); + check_round (); + + tests_end (); + exit (0); +} -- cgit v1.2.3