diff options
Diffstat (limited to 'mpfr/tests/tmodf.c')
| -rw-r--r-- | mpfr/tests/tmodf.c | 236 |
1 files changed, 236 insertions, 0 deletions
diff --git a/mpfr/tests/tmodf.c b/mpfr/tests/tmodf.c new file mode 100644 index 0000000000..b05de0c9da --- /dev/null +++ b/mpfr/tests/tmodf.c @@ -0,0 +1,236 @@ +/* Test file for mpfr_modf. + +Copyright 2007-2016 Free Software Foundation, Inc. +Contributed by the AriC and Caramba projects, INRIA. + +This file is part of the GNU MPFR Library. + +The GNU MPFR 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 3 of the License, or (at your +option) any later version. + +The GNU MPFR 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 MPFR Library; see the file COPYING.LESSER. If not, see +http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc., +51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */ + +#include <stdio.h> +#include <stdlib.h> + +#include "mpfr-test.h" + +#if MPFR_VERSION >= MPFR_VERSION_NUM(2,4,0) + +static void +check (const char *xis, const char *xfs, const char *xs, + mpfr_prec_t xip, mpfr_prec_t xfp, mpfr_prec_t xp, + int expected_return, mpfr_rnd_t rnd_mode) +{ + int inexact; + mpfr_t xi, xf, x; + + mpfr_init2 (xi, xip); + mpfr_init2 (xf, xfp); + mpfr_init2 (x, xp); + mpfr_set_str1 (x, xs); + inexact = mpfr_modf (xi, xf, x, rnd_mode); + if (mpfr_cmp_str1 (xi, xis)) + { + printf ("mpfr_modf failed for x=%s, rnd=%s\n", + xs, mpfr_print_rnd_mode(rnd_mode)); + printf ("got integer value: "); + mpfr_out_str (stdout, 10, 0, xi, MPFR_RNDN); + printf ("\nexpected %s\n", xis); + exit (1); + } + if (mpfr_cmp_str1 (xf, xfs)) + { + printf ("mpfr_modf failed for x=%s, rnd=%s\n", + xs, mpfr_print_rnd_mode(rnd_mode)); + printf ("got fractional value: "); + mpfr_out_str (stdout, 10, 0, xf, MPFR_RNDN); + printf ("\nexpected %s\n", xfs); + exit (1); + } + if (inexact != expected_return) + { + printf ("mpfr_modf failed for x=%s, rnd=%s\n", + xs, mpfr_print_rnd_mode(rnd_mode)); + printf ("got return value: %d, expected %d\n", inexact, expected_return); + exit (1); + } + mpfr_clears (xi, xf, x, (mpfr_ptr) 0); +} + +static void +check_nans (void) +{ + mpfr_t x, xi, xf; + + mpfr_init2 (x, 123); + mpfr_init2 (xi, 123); + mpfr_init2 (xf, 123); + + /* nan */ + mpfr_set_nan (x); + mpfr_modf (xi, xf, x, MPFR_RNDN); + MPFR_ASSERTN (mpfr_nan_p (xi)); + MPFR_ASSERTN (mpfr_nan_p (xf)); + + /* +inf */ + mpfr_set_inf (x, 1); + mpfr_modf (xi, xf, x, MPFR_RNDN); + MPFR_ASSERTN (mpfr_inf_p (xi)); + MPFR_ASSERTN (mpfr_sgn (xi) > 0); + MPFR_ASSERTN (mpfr_zero_p (xf)); + + /* -inf */ + mpfr_set_inf (x, -1); + mpfr_modf (xi ,xf, x, MPFR_RNDN); + MPFR_ASSERTN (mpfr_inf_p (xi)); + MPFR_ASSERTN (mpfr_sgn (xi) < 0); + MPFR_ASSERTN (mpfr_zero_p (xf)); + + mpfr_clear (x); + mpfr_clear (xi); + mpfr_clear (xf); +} + +static void +check_special_exprange (void) +{ + int inexact, ov; + unsigned int eflags, gflags; + mpfr_t xi, xf, x; + mpfr_exp_t emax; + + emax = mpfr_get_emax (); + mpfr_init2 (xi, 7); + mpfr_init2 (xf, 7); + mpfr_init2 (x, 8); + + mpfr_set_str (x, "0.11111111", 2, MPFR_RNDN); + for (ov = 0; ov <= 1; ov++) + { + const char *s = ov ? "@Inf@" : "1"; + + if (ov) + set_emax (0); + mpfr_clear_flags (); + inexact = mpfr_modf (xi, xf, x, MPFR_RNDN); + gflags = __gmpfr_flags; + set_emax (emax); + if (MPFR_NOTZERO (xi) || MPFR_IS_NEG (xi) || + mpfr_cmp_str1 (xf, s) != 0) + { + printf ("Error in check_special_exprange (ov = %d):" + " expected 0 and %s, got\n", ov, s); + mpfr_out_str (stdout, 2, 0, xi, MPFR_RNDN); + printf (" and "); + mpfr_out_str (stdout, 2, 0, xf, MPFR_RNDN); + printf ("\n"); + exit (1); + } + if (inexact != 4) + { + printf ("Bad inexact value in check_special_exprange (ov = %d):" + " expected 4, got %d\n", ov, inexact); + exit (1); + } + eflags = MPFR_FLAGS_INEXACT | (ov ? MPFR_FLAGS_OVERFLOW : 0); + if (gflags != eflags) + { + printf ("Bad flags in check_special_exprange (ov = %d):" + " expected %u, got %u\n", ov, eflags, gflags); + exit (1); + } + } + + /* Test if an overflow occurs in mpfr_set for ope >= opq. */ + mpfr_set_emax (MPFR_EMAX_MAX); + mpfr_set_inf (x, 1); + mpfr_nextbelow (x); + mpfr_clear_flags (); + inexact = mpfr_modf (xi, xf, x, MPFR_RNDN); + gflags = __gmpfr_flags; + if (mpfr_cmp_str1 (xi, "@Inf@") != 0 || + MPFR_NOTZERO (xf) || MPFR_IS_NEG (xf)) + { + printf ("Error in check_special_exprange:" + " expected 0 and @Inf@, got\n"); + mpfr_out_str (stdout, 2, 0, xi, MPFR_RNDN); + printf (" and "); + mpfr_out_str (stdout, 2, 0, xf, MPFR_RNDN); + printf ("\n"); + exit (1); + } + if (inexact != 1) + { + printf ("Bad inexact value in check_special_exprange:" + " expected 1, got %d\n", inexact); + exit (1); + } + eflags = MPFR_FLAGS_INEXACT | MPFR_FLAGS_OVERFLOW; + if (gflags != eflags) + { + printf ("Bad flags in check_special_exprange:" + " expected %u, got %u\n", eflags, gflags); + exit (1); + } + set_emax (emax); + + /* Test if an underflow occurs in the general case. TODO */ + + mpfr_clears (xi, xf, x, (mpfr_ptr) 0); +} + +int +main (int argc, char *argv[]) +{ + tests_start_mpfr (); + + check_nans (); + + /* integer part is exact, frac. part is exact: return value should be 0 */ + check ("61680","3.52935791015625e-1", "61680.352935791015625", + 53, 53, 53, 0, MPFR_RNDZ); + /* integer part is rounded up, fractional part is rounded up: return value + should be 1+4*1=5 */ + check ("-53968","-3.529052734375e-1", "-53970.352935791015625", + 13, 13, 53, 5, MPFR_RNDZ); + /* integer part is rounded down, fractional part is rounded down: + return value should be 2+4*2=10 */ + check ("61632","3.525390625e-1", "61648.352935791015625", + 10, 10, 53, 10, MPFR_RNDZ); + check ("61680", "0", "61680", 53, 53, 53, 0, MPFR_RNDZ); + /* integer part is rounded up, fractional part is exact: 1 */ + check ("-53968","0", "-53970", 13, 13, 53, 1, MPFR_RNDZ); + /* integer part is rounded up, fractional part is exact: 1 */ + check ("-43392","0", "-43399", 13, 13, 53, 1, MPFR_RNDU); + /* integer part is rounded down, fractional part is exact: 2 */ + check ("-52720","0", "-52719", 13, 13, 53, 2, MPFR_RNDD); + /* integer part is rounded down, fractional part is exact: 2 */ + check ("61632", "0", "61648", 10, 10, 53, 2, MPFR_RNDZ); + + check_special_exprange (); + + tests_end_mpfr (); + return 0; +} + +#else + +int +main (void) +{ + printf ("Warning! Test disabled for this MPFR version.\n"); + return 0; +} + +#endif |