X-Git-Url: https://oss.titaniummirror.com/gitweb/?a=blobdiff_plain;f=mpfr%2Ftests%2Ftget_f.c;fp=mpfr%2Ftests%2Ftget_f.c;h=bce29e870a9f93774226488f0d0f7ff42134b00a;hb=6fed43773c9b0ce596dca5686f37ac3fc0fa11c0;hp=0000000000000000000000000000000000000000;hpb=27b11d56b743098deb193d510b337ba22dc52e5c;p=msp430-gcc.git diff --git a/mpfr/tests/tget_f.c b/mpfr/tests/tget_f.c new file mode 100644 index 00000000..bce29e87 --- /dev/null +++ b/mpfr/tests/tget_f.c @@ -0,0 +1,247 @@ +/* Test file for mpfr_get_f. + +Copyright 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" + +/* Test that there is no lost of accuracy when converting a mpfr_t number + into a mpf_t number (test with various precisions and exponents). */ +static void +prec_test (void) +{ + int px, py; + + for (py = 3; py <= 136; py++) + { + mpfr_t y1, y2, y3; + + mpfr_init2 (y1, py); + mpfr_init2 (y2, py); + mpfr_init2 (y3, py); + + for (px = 32; px <= 160; px += 32) + { + mpf_t x1, x2, x3; + int e; + + mpf_init (x1); + mpf_init (x2); + mpf_init (x3); + mpfr_set_ui_2exp (y1, 1, py - 1, GMP_RNDN); + mpfr_get_f (x1, y1, GMP_RNDN); /* exact (power of 2) */ + mpf_set (x2, x1); + mpfr_set (y2, y1, GMP_RNDN); + + for (e = py - 2; e >= 0; e--) + { + int inex; + mpf_div_2exp (x2, x2, 1); + mpf_add (x1, x1, x2); + mpfr_div_2exp (y2, y2, 1, GMP_RNDN); + inex = mpfr_add (y1, y1, y2, GMP_RNDN); + MPFR_ASSERTN (inex == 0); + mpfr_set_f (y3, x1, GMP_RNDN); + if (! mpfr_equal_p (y1, y3)) + break; + mpfr_get_f (x3, y3, GMP_RNDN); + if (mpf_cmp (x1, x3) != 0) + { + printf ("Error in prec_test (px = %d, py = %d, e = %d)\n", + px, py, e); + printf ("x1 = "); + mpf_out_str (stdout, 16, 0, x1); + printf ("\nx2 = "); + mpf_out_str (stdout, 16, 0, x1); + printf ("\n"); + exit (1); + } + } + + mpf_clear (x1); + mpf_clear (x2); + mpf_clear (x3); + } + + mpfr_clear (y1); + mpfr_clear (y2); + mpfr_clear (y3); + } +} + +int +main (void) +{ + mpf_t x; + mpfr_t y, z; + unsigned long i; + mp_exp_t e; + int inex; + + tests_start_mpfr (); + + mpfr_init (y); + mpfr_init (z); + mpf_init (x); + + mpfr_set_nan (y); + if (mpfr_get_f (x, y, GMP_RNDN) == 0) + { + printf ("Error: mpfr_get_f(NaN) should fail\n"); + exit (1); + } + + mpfr_set_inf (y, 1); + if (mpfr_get_f (x, y, GMP_RNDN) == 0) + { + printf ("Error: mpfr_get_f(+Inf) should fail\n"); + exit (1); + } + + mpfr_set_inf (y, -1); + if (mpfr_get_f (x, y, GMP_RNDN) == 0) + { + printf ("Error: mpfr_get_f(-Inf) should fail\n"); + exit (1); + } + + mpfr_set_ui (y, 0, GMP_RNDN); + if (mpfr_get_f (x, y, GMP_RNDN) || mpf_cmp_ui (x, 0)) + { + printf ("Error: mpfr_get_f(+0) fails\n"); + exit (1); + } + + mpfr_set_ui (y, 0, GMP_RNDN); + mpfr_neg (y, y, GMP_RNDN); + if (mpfr_get_f (x, y, GMP_RNDN) || mpf_cmp_ui (x, 0)) + { + printf ("Error: mpfr_get_f(-0) fails\n"); + exit (1); + } + + i = 1; + while (i) + { + mpfr_set_ui (y, i, GMP_RNDN); + if (mpfr_get_f (x, y, GMP_RNDN) || mpf_cmp_ui (x, i)) + { + printf ("Error: mpfr_get_f(%lu) fails\n", i); + exit (1); + } + if (i <= - (unsigned long) LONG_MIN) + { + long j = i < - (unsigned long) LONG_MIN ? - (long) i : LONG_MIN; + mpfr_set_si (y, j, GMP_RNDN); + if (mpfr_get_f (x, y, GMP_RNDN) || mpf_cmp_si (x, j)) + { + printf ("Error: mpfr_get_f(-%lu) fails\n", i); + exit (1); + } + } + i *= 2; + } + + /* same tests, but with a larger precision for y, which requires to + round it */ + mpfr_set_prec (y, 100); + i = 1; + while (i) + { + mpfr_set_ui (y, i, GMP_RNDN); + if (mpfr_get_f (x, y, GMP_RNDN) || mpf_cmp_ui (x, i)) + { + printf ("Error: mpfr_get_f(%lu) fails\n", i); + exit (1); + } + mpfr_set_si (y, (signed long) -i, GMP_RNDN); + if (mpfr_get_f (x, y, GMP_RNDN) || mpf_cmp_si (x, (signed long) -i)) + { + printf ("Error: mpfr_get_f(-%lu) fails\n", i); + exit (1); + } + i *= 2; + } + + /* bug reported by Jim White */ + for (e = 0; e <= 2 * BITS_PER_MP_LIMB; e++) + { + /* test with 2^(-e) */ + mpfr_set_ui (y, 1, GMP_RNDN); + mpfr_div_2exp (y, y, e, GMP_RNDN); + mpfr_get_f (x, y, GMP_RNDN); + mpf_mul_2exp (x, x, e); + if (mpf_cmp_ui (x, 1) != 0) + { + printf ("Error: mpfr_get_f(x,y,GMP_RNDN) fails\n"); + printf ("y="); + mpfr_dump (y); + printf ("x="); + mpf_div_2exp (x, x, e); + mpf_dump (x); + exit (1); + } + + /* test with 2^(e) */ + mpfr_set_ui (y, 1, GMP_RNDN); + mpfr_mul_2exp (y, y, e, GMP_RNDN); + mpfr_get_f (x, y, GMP_RNDN); + mpf_div_2exp (x, x, e); + if (mpf_cmp_ui (x, 1) != 0) + { + printf ("Error: mpfr_get_f(x,y,GMP_RNDN) fails\n"); + printf ("y="); + mpfr_dump (y); + printf ("x="); + mpf_mul_2exp (x, x, e); + mpf_dump (x); + exit (1); + } + } + + /* Bug reported by Yury Lukach on 2006-04-05 */ + mpfr_set_prec (y, 32); + mpfr_set_prec (z, 32); + mpf_set_prec (x, 32); + mpfr_set_ui_2exp (y, 0xc1234567, -30, GMP_RNDN); + mpfr_get_f (x, y, GMP_RNDN); + inex = mpfr_set_f (z, x, GMP_RNDN); + if (inex || ! mpfr_equal_p (y, z)) + { + printf ("Error in mpfr_get_f:\n inex = %d, y = ", inex); + mpfr_dump (z); + printf ("Expected:\n inex = 0, y = "); + mpfr_dump (y); + exit (1); + } + + mpfr_clear (y); + mpfr_clear (z); + mpf_clear (x); + + prec_test (); + + tests_end_mpfr (); + return 0; +}