X-Git-Url: https://oss.titaniummirror.com/gitweb/?a=blobdiff_plain;ds=sidebyside;f=mpfr%2Ftests%2Ftui_div.c;fp=mpfr%2Ftests%2Ftui_div.c;h=d4f596b32477e96056dbbc3f71f78e1823758259;hb=6fed43773c9b0ce596dca5686f37ac3fc0fa11c0;hp=0000000000000000000000000000000000000000;hpb=27b11d56b743098deb193d510b337ba22dc52e5c;p=msp430-gcc.git diff --git a/mpfr/tests/tui_div.c b/mpfr/tests/tui_div.c new file mode 100644 index 00000000..d4f596b3 --- /dev/null +++ b/mpfr/tests/tui_div.c @@ -0,0 +1,192 @@ +/* Test file for mpfr_ui_div. + +Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc. +Contributed by the Arenaire and Cacao 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 2.1 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.LIB. If not, write to +the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, +MA 02110-1301, USA. */ + +#include +#include + +#include "mpfr-test.h" + +/* checks that y/x gives the right result with 53 bits of precision */ +static void +check (unsigned long y, const char *xs, mp_rnd_t rnd_mode, const char *zs) +{ + mpfr_t xx, zz; + + mpfr_inits2 (53, xx, zz, (mpfr_ptr) 0); + mpfr_set_str1 (xx, xs); + mpfr_ui_div (zz, y, xx, rnd_mode); + if (mpfr_cmp_str1(zz, zs)) + { + printf ("expected quotient is %s, got ", zs); + mpfr_out_str (stdout, 10, 0, zz, GMP_RNDN); + printf ("mpfr_ui_div failed for y=%lu x=%s with rnd_mode=%s\n", + y, xs, mpfr_print_rnd_mode (rnd_mode)); + exit (1); + } + mpfr_clears (xx, zz, (mpfr_ptr) 0); +} + +static void +check_inexact (void) +{ + mpfr_t x, y, z; + mp_prec_t px, py; + int inexact, cmp; + unsigned long int u; + int rnd; + + mpfr_init (x); + mpfr_init (y); + mpfr_init (z); + + for (px=2; px<300; px++) + { + mpfr_set_prec (x, px); + do + { + mpfr_urandomb (x, RANDS); + } + while (mpfr_cmp_ui (x, 0) == 0); + u = randlimb (); + for (py=2; py<300; py++) + { + mpfr_set_prec (y, py); + mpfr_set_prec (z, py + px); + for (rnd = 0; rnd < GMP_RND_MAX; rnd++) + { + inexact = mpfr_ui_div (y, u, x, (mp_rnd_t) rnd); + if (mpfr_mul (z, y, x, (mp_rnd_t) rnd)) + { + printf ("z <- y * x should be exact\n"); + exit (1); + } + cmp = mpfr_cmp_ui (z, u); + if (((inexact == 0) && (cmp != 0)) || + ((inexact > 0) && (cmp <= 0)) || + ((inexact < 0) && (cmp >= 0))) + { + printf ("Wrong inexact flag for u=%lu, rnd=%s\n", + u, mpfr_print_rnd_mode ((mp_rnd_t) rnd)); + printf ("expected %d, got %d\n", cmp, inexact); + printf ("x="); mpfr_print_binary (x); puts (""); + printf ("y="); mpfr_print_binary (y); puts (""); + printf ("y*x="); mpfr_print_binary (z); puts (""); + exit (1); + } + } + } + } + + mpfr_clear (x); + mpfr_clear (y); + mpfr_clear (z); +} + +static void +check_nan (void) +{ + mpfr_t d, q; + + mpfr_init2 (d, 100L); + mpfr_init2 (q, 100L); + + /* 1/+inf == 0 */ + MPFR_CLEAR_FLAGS (d); + MPFR_SET_INF (d); + MPFR_SET_POS (d); + MPFR_ASSERTN (mpfr_ui_div (q, 1L, d, GMP_RNDZ) == 0); /* exact */ + MPFR_ASSERTN (mpfr_number_p (q)); + MPFR_ASSERTN (mpfr_sgn (q) == 0); + + /* 1/-inf == -0 */ + MPFR_CLEAR_FLAGS (d); + MPFR_SET_INF (d); + MPFR_SET_NEG (d); + MPFR_ASSERTN (mpfr_ui_div (q, 1L, d, GMP_RNDZ) == 0); /* exact */ + MPFR_ASSERTN (mpfr_number_p (q)); + MPFR_ASSERTN (mpfr_sgn (q) == 0); + + /* 1/nan == nan */ + MPFR_SET_NAN (d); + MPFR_ASSERTN (mpfr_ui_div (q, 1L, d, GMP_RNDZ) == 0); /* exact */ + MPFR_ASSERTN (mpfr_nan_p (q)); + + /* 0/0 == nan */ + mpfr_set_ui (d, 0L, GMP_RNDN); + MPFR_ASSERTN (mpfr_ui_div (q, 0L, d, GMP_RNDZ) == 0); /* exact */ + MPFR_ASSERTN (mpfr_nan_p (q)); + + /* 1/+0 = +inf */ + mpfr_set_ui (d, 0L, GMP_RNDN); + MPFR_ASSERTN (mpfr_ui_div (q, 1L, d, GMP_RNDZ) == 0); /* exact */ + MPFR_ASSERTN (mpfr_inf_p (q) && mpfr_sgn (q) > 0); + + /* 1/-0 = -inf */ + mpfr_set_ui (d, 0L, GMP_RNDN); + mpfr_neg (d, d, GMP_RNDN); + MPFR_ASSERTN (mpfr_ui_div (q, 1L, d, GMP_RNDZ) == 0); /* exact */ + MPFR_ASSERTN (mpfr_inf_p (q) && mpfr_sgn (q) < 0); + + /* 0/1 = +0 */ + mpfr_set_ui (d, 1L, GMP_RNDN); + MPFR_ASSERTN (mpfr_ui_div (q, 0L, d, GMP_RNDZ) == 0); /* exact */ + MPFR_ASSERTN (mpfr_cmp_ui (q, 0) == 0 && MPFR_IS_POS (q)); + + /* 0/-1 = -0 */ + mpfr_set_si (d, -1, GMP_RNDN); + MPFR_ASSERTN (mpfr_ui_div (q, 0L, d, GMP_RNDZ) == 0); /* exact */ + MPFR_ASSERTN (mpfr_cmp_ui (q, 0) == 0 && MPFR_IS_NEG (q)); + + mpfr_clear (d); + mpfr_clear (q); +} + +static int +mpfr_inv (mpfr_ptr y, mpfr_srcptr x, mp_rnd_t r) +{ + return mpfr_ui_div (y, 1, x, r); +} + +int +main (int argc, char *argv[]) +{ + tests_start_mpfr (); + + check_nan (); + check_inexact (); + check(948002822, "1.22191250737771397120e+20", GMP_RNDN, + "7.758352715731357946e-12"); + check(1976245324, "1.25296395864546893357e+232", GMP_RNDZ, + "1.5772563211925444801e-223"); + check(740454110, "2.11496253355831863313e+183", GMP_RNDZ, + "3.5010270784996976041e-175"); + check(1690540942, "1.28278599852446657468e-276", GMP_RNDU, + "1.3178666932321966062e285"); + check(1476599377, "-2.14191393656148625995e+305", GMP_RNDD, + "-6.8938315017943889615e-297"); + + /* inv is for 1/x */ + data_check ("data/inv", mpfr_inv, "mpfr_ui_div(1,x)"); + + tests_end_mpfr (); + return 0; +}