diff options
Diffstat (limited to 'mpfr/tests/tdiv_ui.c')
| -rw-r--r-- | mpfr/tests/tdiv_ui.c | 132 |
1 files changed, 125 insertions, 7 deletions
diff --git a/mpfr/tests/tdiv_ui.c b/mpfr/tests/tdiv_ui.c index df6294793..5fcc5639b 100644 --- a/mpfr/tests/tdiv_ui.c +++ b/mpfr/tests/tdiv_ui.c @@ -1,20 +1,20 @@ /* Test file for mpfr_div_ui. -Copyright (C) 1999 Free Software Foundation. +Copyright (C) 1999-2001 Free Software Foundation. This file is part of the MPFR Library. The MPFR Library is free software; you can redistribute it and/or modify -it under the terms of the GNU Library General Public License as published by -the Free Software Foundation; either version 2 of the License, or (at your +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 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 Library General Public +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 Library General Public License +You should have received a copy of the GNU Lesser General Public License along with the MPFR Library; see the file COPYING.LIB. If not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ @@ -28,10 +28,13 @@ MA 02111-1307, USA. */ #include "mpfr-test.h" void check _PROTO((double, unsigned long, mp_rnd_t, double)); +void special _PROTO((void)); +void check_inexact _PROTO((void)); void check (double d, unsigned long u, mp_rnd_t rnd, double e) { - mpfr_t x, y; double f; + mpfr_t x, y; + double f; mpfr_init2(x, 53); mpfr_init2(y, 53); #ifdef TEST @@ -50,8 +53,119 @@ void check (double d, unsigned long u, mp_rnd_t rnd, double e) mpfr_clear(x); mpfr_clear(y); } +void +special (void) +{ + mpfr_t x, y; + unsigned xprec, yprec; + + mpfr_init (x); + mpfr_init (y); + + mpfr_set_prec (x, 32); + mpfr_set_prec (y, 32); + mpfr_set_ui (x, 1, GMP_RNDN); + mpfr_div_ui (y, x, 3, GMP_RNDN); + + mpfr_set_prec (x, 100); + mpfr_set_prec (y, 100); + mpfr_random (x); + mpfr_div_ui (y, x, 123456, GMP_RNDN); + mpfr_set_ui (x, 0, GMP_RNDN); + mpfr_div_ui (y, x, 123456789, GMP_RNDN); + if (mpfr_cmp_ui (y, 0)) + { + fprintf (stderr, "mpfr_div_ui gives non-zero for 0/ui\n"); + exit (1); + } + + /* bug found by Norbert Mueller, 21 Aug 2001 */ + mpfr_set_prec (x, 110); + mpfr_set_prec (y, 60); + mpfr_set_str_raw (x, "0.110101110011111110011111001110011001110111000000111110001000111011000011E-44"); + mpfr_div_ui(y, x, 17, __gmp_default_rounding_mode); + if (mpfr_get_d (y) != 2.8114572543455207632e-15) + { + fprintf (stderr, "Error in x / 17 for x=1/16!\n"); + exit (1); + } + + for (xprec = 53; xprec <= 128; xprec++) + { + mpfr_set_prec (x, xprec); + mpfr_set_str_raw (x, "0.1100100100001111110011111000000011011100001100110111E2"); + for (yprec = 53; yprec <= 128; yprec++) + { + mpfr_set_prec (y, yprec); + mpfr_div_ui (y, x, 1, GMP_RNDN); + if (mpfr_get_d (x) != mpfr_get_d (y)) + { + fprintf (stderr, "division by 1.0 fails for xprec=%u, yprec=%u\n", xprec, yprec); + printf ("expected "); mpfr_print_raw (x); putchar ('\n'); + printf ("got "); mpfr_print_raw (y); putchar ('\n'); + exit (1); + } + } + } + + mpfr_clear (x); + mpfr_clear (y); +} + +void +check_inexact () +{ + mpfr_t x, y, z; + mp_prec_t px, py; + int inexact, cmp; + unsigned long int u; + mp_rnd_t rnd; + + mpfr_init (x); + mpfr_init (y); + mpfr_init (z); + + for (px=1; px<300; px++) + { + mpfr_set_prec (x, px); + mpfr_random (x); + do { u = lrand48 (); } while (u == 0); + for (py=1; py<300; py++) + { + mpfr_set_prec (y, py); + mpfr_set_prec (z, py + mp_bits_per_limb); + for (rnd=0; rnd<4; rnd++) + { + inexact = mpfr_div_ui (y, x, u, rnd); + if (mpfr_mul_ui (z, y, u, rnd)) + { + fprintf (stderr, "z <- y * u should be exact for u=%lu\n", u); + printf ("y="); mpfr_print_raw (y); putchar ('\n'); + printf ("z="); mpfr_print_raw (z); putchar ('\n'); + exit (1); + } + cmp = mpfr_cmp (z, x); + if (((inexact == 0) && (cmp != 0)) || + ((inexact > 0) && (cmp <= 0)) || + ((inexact < 0) && (cmp >= 0))) + { + fprintf (stderr, "Wrong inexact flag for u=%lu, rnd=%s\n", u, + mpfr_print_rnd_mode(rnd)); + printf ("x="); mpfr_print_raw (x); putchar ('\n'); + printf ("y="); mpfr_print_raw (y); putchar ('\n'); + exit (1); + } + } + } + } + + mpfr_clear (x); + mpfr_clear (y); + mpfr_clear (z); +} + int -main(int argc, char **argv) +main (int argc, char **argv) { mpfr_t x; #ifdef TEST @@ -65,6 +179,10 @@ main(int argc, char **argv) } #endif + check_inexact (); + + special (); + check(1.0, 3, GMP_RNDN, 3.3333333333333331483e-1); check(1.0, 3, GMP_RNDZ, 3.3333333333333331483e-1); check(1.0, 3, GMP_RNDU, 3.3333333333333337034e-1); |