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Diffstat (limited to 'mpfr/tests/td_div.c')
| -rw-r--r-- | mpfr/tests/td_div.c | 209 |
1 files changed, 209 insertions, 0 deletions
diff --git a/mpfr/tests/td_div.c b/mpfr/tests/td_div.c new file mode 100644 index 0000000000..3421fa1035 --- /dev/null +++ b/mpfr/tests/td_div.c @@ -0,0 +1,209 @@ +/* Test file for mpfr_d_div + +Copyright 2007, 2008, 2009, 2010, 2011, 2012, 2013 Free Software Foundation, Inc. +Contributed by the AriC and Caramel 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 <float.h> + +#include "mpfr-test.h" + +#if MPFR_VERSION >= MPFR_VERSION_NUM(2,4,0) + +static void +check_nans (void) +{ + mpfr_t x, y; + int inexact; + + mpfr_init2 (x, 123); + mpfr_init2 (y, 123); + + /* 1.0 / nan is nan */ + mpfr_set_nan (x); + mpfr_clear_flags (); + inexact = mpfr_d_div (y, 1.0, x, MPFR_RNDN); + MPFR_ASSERTN (inexact == 0); + MPFR_ASSERTN (__gmpfr_flags == MPFR_FLAGS_NAN); + MPFR_ASSERTN (mpfr_nan_p (y)); + + /* 1.0 / +inf == +0 */ + mpfr_set_inf (x, 1); + mpfr_clear_flags (); + inexact = mpfr_d_div (y, 1.0, x, MPFR_RNDN); + MPFR_ASSERTN (inexact == 0); + MPFR_ASSERTN (__gmpfr_flags == 0); + MPFR_ASSERTN (mpfr_zero_p (y)); + MPFR_ASSERTN (MPFR_IS_POS (y)); + + /* 1.0 / -inf == -0 */ + mpfr_set_inf (x, -1); + mpfr_clear_flags (); + inexact = mpfr_d_div (y, 1.0, x, MPFR_RNDN); + MPFR_ASSERTN (inexact == 0); + MPFR_ASSERTN (__gmpfr_flags == 0); + MPFR_ASSERTN (mpfr_zero_p (y)); + MPFR_ASSERTN (MPFR_IS_NEG (y)); + +#if !defined(MPFR_ERRDIVZERO) + + /* 1.0 / 0 == +inf */ + mpfr_set_ui (x, 0, MPFR_RNDN); + mpfr_clear_flags (); + inexact = mpfr_d_div (y, 1.0, x, MPFR_RNDN); + MPFR_ASSERTN (inexact == 0); + MPFR_ASSERTN (__gmpfr_flags == MPFR_FLAGS_DIVBY0); + MPFR_ASSERTN (mpfr_inf_p (y)); + MPFR_ASSERTN (MPFR_IS_POS (y)); + + /* -1.0 / 0 == -inf */ + mpfr_set_ui (x, 0, MPFR_RNDN); + mpfr_clear_flags (); + inexact = mpfr_d_div (y, -1.0, x, MPFR_RNDN); + MPFR_ASSERTN (inexact == 0); + MPFR_ASSERTN (__gmpfr_flags == MPFR_FLAGS_DIVBY0); + MPFR_ASSERTN (mpfr_inf_p (y)); + MPFR_ASSERTN (MPFR_IS_NEG (y)); + + /* 1.0 / -0 == -inf */ + mpfr_set_ui (x, 0, MPFR_RNDN); + mpfr_neg (x, x, MPFR_RNDN); + mpfr_clear_flags (); + inexact = mpfr_d_div (y, 1.0, x, MPFR_RNDN); + MPFR_ASSERTN (inexact == 0); + MPFR_ASSERTN (__gmpfr_flags == MPFR_FLAGS_DIVBY0); + MPFR_ASSERTN (mpfr_inf_p (y)); + MPFR_ASSERTN (MPFR_IS_NEG (y)); + + /* -1.0 / -0 == +inf */ + mpfr_set_ui (x, 0, MPFR_RNDN); + mpfr_neg (x, x, MPFR_RNDN); + mpfr_clear_flags (); + inexact = mpfr_d_div (y, -1.0, x, MPFR_RNDN); + MPFR_ASSERTN (inexact == 0); + MPFR_ASSERTN (__gmpfr_flags == MPFR_FLAGS_DIVBY0); + MPFR_ASSERTN (mpfr_inf_p (y)); + MPFR_ASSERTN (MPFR_IS_POS (y)); + + /* +inf / 0 == +inf */ + mpfr_set_ui (x, 0, MPFR_RNDN); + mpfr_clear_flags (); + inexact = mpfr_d_div (y, DBL_POS_INF, x, MPFR_RNDN); + MPFR_ASSERTN (inexact == 0); + MPFR_ASSERTN (__gmpfr_flags == 0); + MPFR_ASSERTN (mpfr_inf_p (y)); + MPFR_ASSERTN (MPFR_IS_POS (y)); + + /* -inf / 0 == -inf */ + mpfr_set_ui (x, 0, MPFR_RNDN); + mpfr_clear_flags (); + inexact = mpfr_d_div (y, DBL_NEG_INF, x, MPFR_RNDN); + MPFR_ASSERTN (inexact == 0); + MPFR_ASSERTN (__gmpfr_flags == 0); + MPFR_ASSERTN (mpfr_inf_p (y)); + MPFR_ASSERTN (MPFR_IS_NEG (y)); + + /* +inf / -0 == -inf */ + mpfr_set_ui (x, 0, MPFR_RNDN); + mpfr_neg (x, x, MPFR_RNDN); + mpfr_clear_flags (); + inexact = mpfr_d_div (y, DBL_POS_INF, x, MPFR_RNDN); + MPFR_ASSERTN (inexact == 0); + MPFR_ASSERTN (__gmpfr_flags == 0); + MPFR_ASSERTN (mpfr_inf_p (y)); + MPFR_ASSERTN (MPFR_IS_NEG (y)); + + /* -inf / -0 == +inf */ + mpfr_set_ui (x, 0, MPFR_RNDN); + mpfr_neg (x, x, MPFR_RNDN); + mpfr_clear_flags (); + inexact = mpfr_d_div (y, DBL_NEG_INF, x, MPFR_RNDN); + MPFR_ASSERTN (inexact == 0); + MPFR_ASSERTN (__gmpfr_flags == 0); + MPFR_ASSERTN (mpfr_inf_p (y)); + MPFR_ASSERTN (MPFR_IS_POS (y)); + +#endif + + mpfr_clear (x); + mpfr_clear (y); +} + +#define TEST_FUNCTION mpfr_d_sub +#define DOUBLE_ARG1 +#define RAND_FUNCTION(x) mpfr_random2(x, MPFR_LIMB_SIZE (x), 1, RANDS) +#include "tgeneric.c" + +int +main (void) +{ + mpfr_t x, y, z; + double d; + int inexact; + + tests_start_mpfr (); + + /* check with enough precision */ + mpfr_init2 (x, IEEE_DBL_MANT_DIG); + mpfr_init2 (y, IEEE_DBL_MANT_DIG); + mpfr_init2 (z, IEEE_DBL_MANT_DIG); + + mpfr_set_str (y, "4096", 10, MPFR_RNDN); + d = 0.125; + mpfr_clear_flags (); + inexact = mpfr_d_div (x, d, y, MPFR_RNDN); + if (inexact != 0) + { + printf ("Inexact flag error in mpfr_d_div\n"); + exit (1); + } + mpfr_set_str (z, " 0.000030517578125", 10, MPFR_RNDN); + if (mpfr_cmp (z, x)) + { + printf ("Error in mpfr_d_div ("); + mpfr_out_str (stdout, 10, 0, y, MPFR_RNDN); + printf (" + %.20g)\nexpected ", d); + mpfr_out_str (stdout, 10, 0, z, MPFR_RNDN); + printf ("\ngot "); + mpfr_out_str (stdout, 10, 0, x, MPFR_RNDN); + printf ("\n"); + exit (1); + } + mpfr_clears (x, y, z, (mpfr_ptr) 0); + + check_nans (); + + test_generic (2, 1000, 100); + + tests_end_mpfr (); + return 0; +} + +#else + +int +main (void) +{ + printf ("Warning! Test disabled for this MPFR version.\n"); + return 0; +} + +#endif |