X-Git-Url: https://oss.titaniummirror.com/gitweb?a=blobdiff_plain;f=mpfr%2Ftests%2Ftdiv_ui.c;fp=mpfr%2Ftests%2Ftdiv_ui.c;h=80f0e3961d1ed96f7a0fcfc207db888785b11c11;hb=6fed43773c9b0ce596dca5686f37ac3fc0fa11c0;hp=0000000000000000000000000000000000000000;hpb=27b11d56b743098deb193d510b337ba22dc52e5c;p=msp430-gcc.git diff --git a/mpfr/tests/tdiv_ui.c b/mpfr/tests/tdiv_ui.c new file mode 100644 index 00000000..80f0e396 --- /dev/null +++ b/mpfr/tests/tdiv_ui.c @@ -0,0 +1,237 @@ +/* Test file for mpfr_div_ui. + +Copyright 1999, 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 + +#include "mpfr-test.h" + +static void +check (const char *ds, unsigned long u, mp_rnd_t rnd, const char *es) +{ + mpfr_t x, y; + + mpfr_init2 (x, 53); + mpfr_init2 (y, 53); + mpfr_set_str1 (x, ds); + mpfr_div_ui (y, x, u, rnd); + if (mpfr_cmp_str1 (y, es)) + { + printf ("mpfr_div_ui failed for x=%s, u=%lu, rnd=%s\n", ds, u, + mpfr_print_rnd_mode (rnd)); + printf ("expected result is %s, got", es); + mpfr_out_str(stdout, 10, 0, y, GMP_RNDN); + exit (1); + } + mpfr_clear (x); + mpfr_clear (y); +} + +static 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_urandomb (x, RANDS); + 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)) + { + printf ("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_binary (x, "0.110101110011111110011111001110011001110111000000111110001000111011000011E-44"); + mpfr_div_ui (y, x, 17, GMP_RNDN); + mpfr_set_str_binary (x, "0.11001010100101100011101110000001100001010110101001010011011E-48"); + if (mpfr_cmp (x, y)) + { + printf ("Error in x/17 for x=1/16!\n"); + printf ("Expected "); + mpfr_out_str (stdout, 2, 0, x, GMP_RNDN); + printf ("\nGot "); + mpfr_out_str (stdout, 2, 0, y, GMP_RNDN); + printf ("\n"); + exit (1); + } + + /* corner case */ + mpfr_set_prec (x, 2 * mp_bits_per_limb); + mpfr_set_prec (y, 2); + mpfr_set_ui (x, 4, GMP_RNDN); + mpfr_nextabove (x); + mpfr_div_ui (y, x, 2, GMP_RNDN); /* exactly in the middle */ + MPFR_ASSERTN(mpfr_cmp_ui (y, 2) == 0); + + mpfr_set_prec (x, 3 * mp_bits_per_limb); + mpfr_set_prec (y, 2); + mpfr_set_ui (x, 2, GMP_RNDN); + mpfr_nextabove (x); + mpfr_div_ui (y, x, 2, GMP_RNDN); + MPFR_ASSERTN(mpfr_cmp_ui (y, 1) == 0); + + mpfr_set_prec (x, 3 * mp_bits_per_limb); + mpfr_set_prec (y, 2); + mpfr_set_si (x, -4, GMP_RNDN); + mpfr_nextbelow (x); + mpfr_div_ui (y, x, 2, GMP_RNDD); + MPFR_ASSERTN(mpfr_cmp_si (y, -3) == 0); + + for (xprec = 53; xprec <= 128; xprec++) + { + mpfr_set_prec (x, xprec); + mpfr_set_str_binary (x, "0.1100100100001111110011111000000011011100001100110111E2"); + for (yprec = 53; yprec <= 128; yprec++) + { + mpfr_set_prec (y, yprec); + mpfr_div_ui (y, x, 1, GMP_RNDN); + if (mpfr_cmp(x,y)) + { + printf ("division by 1.0 fails for xprec=%u, yprec=%u\n", xprec, yprec); + printf ("expected "); mpfr_print_binary (x); puts (""); + printf ("got "); mpfr_print_binary (y); puts (""); + exit (1); + } + } + } + + /* Bug reported by Mark Dickinson, 6 Nov 2007 */ + mpfr_set_si (x, 0, GMP_RNDN); + mpfr_set_si (y, -1, GMP_RNDN); + mpfr_div_ui (y, x, 4, GMP_RNDN); + MPFR_ASSERTN(MPFR_IS_ZERO(y) && MPFR_IS_POS(y)); + + mpfr_clear (x); + mpfr_clear (y); +} + +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); + mpfr_urandomb (x, RANDS); + do + { + u = randlimb (); + } + while (u == 0); + for (py=2; py<300; py++) + { + mpfr_set_prec (y, py); + mpfr_set_prec (z, py + mp_bits_per_limb); + for (rnd = 0; rnd < GMP_RND_MAX; rnd++) + { + inexact = mpfr_div_ui (y, x, u, (mp_rnd_t) rnd); + if (mpfr_mul_ui (z, y, u, (mp_rnd_t) rnd)) + { + printf ("z <- y * u should be exact for u=%lu\n", u); + printf ("y="); mpfr_print_binary (y); puts (""); + printf ("z="); mpfr_print_binary (z); puts (""); + exit (1); + } + cmp = mpfr_cmp (z, x); + 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 ("x="); mpfr_print_binary (x); puts (""); + printf ("y="); mpfr_print_binary (y); puts (""); + exit (1); + } + } + } + } + + mpfr_clear (x); + mpfr_clear (y); + mpfr_clear (z); +} + +#define TEST_FUNCTION mpfr_div_ui +#define INTEGER_TYPE unsigned long +#define RAND_FUNCTION(x) mpfr_random2(x, MPFR_LIMB_SIZE (x), 1) +#include "tgeneric_ui.c" + +int +main (int argc, char **argv) +{ + mpfr_t x; + + tests_start_mpfr (); + + special (); + + check_inexact (); + + 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"); + check("1.0", 3, GMP_RNDD, "3.3333333333333331483e-1"); + check("1.0", 2116118, GMP_RNDN, "4.7256343927890600483e-7"); + check("1.098612288668109782", 5, GMP_RNDN, "0.21972245773362195087"); + + mpfr_init2 (x, 53); + mpfr_set_ui (x, 3, GMP_RNDD); + mpfr_log (x, x, GMP_RNDD); + mpfr_div_ui (x, x, 5, GMP_RNDD); + if (mpfr_cmp_str1 (x, "0.21972245773362189536")) + { + printf ("Error in mpfr_div_ui for x=ln(3), u=5\n"); + exit (1); + } + mpfr_clear (x); + + test_generic_ui (2, 200, 100); + + tests_end_mpfr (); + return 0; +}