| /* Test file for mpfr_const_log2. |
| |
| Copyright 1999, 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 <stdio.h> |
| #include <stdlib.h> |
| |
| #include "mpfr-test.h" |
| |
| /* tlog2 [prec] [rnd] [0 = no print] */ |
| |
| static void |
| check (mp_prec_t p0, mp_prec_t p1) |
| { |
| mpfr_t x, y, z; |
| mp_rnd_t rnd; |
| int dif; |
| |
| mpfr_init (x); |
| mpfr_init (y); |
| mpfr_init2 (z, p1 + 10); |
| mpfr_const_log2 (z, GMP_RNDN); |
| mpfr_clear_cache (__gmpfr_cache_const_log2); |
| |
| for (; p0<=p1; p0++) |
| { |
| mpfr_set_prec (x, p0); |
| mpfr_set_prec (y, p0); |
| { |
| rnd = RND_RAND (); |
| mpfr_const_log2 (x, rnd); |
| mpfr_set (y, z, rnd); |
| if ((dif = mpfr_cmp (x, y)) |
| && mpfr_can_round (z, mpfr_get_prec(z), GMP_RNDN, |
| rnd, p0)) |
| { |
| printf ("mpfr_const_log2 fails for prec=%u, rnd=%s Diff=%d\n", |
| (unsigned int) p0, mpfr_print_rnd_mode (rnd), dif); |
| printf ("expected "), mpfr_dump (y); |
| printf ("got "), mpfr_dump (x); |
| exit (1); |
| } |
| } |
| } |
| |
| mpfr_clear (x); |
| mpfr_clear (y); |
| mpfr_clear (z); |
| } |
| |
| static void |
| check_large (void) |
| { |
| mpfr_t x, y; |
| mpfr_init2 (x, 25000); |
| mpfr_init2 (y, 26000); |
| (mpfr_const_log2) (x, GMP_RNDN); /* First one ! */ |
| (mpfr_const_log2) (y, GMP_RNDN); /* Then the other - cache - */ |
| mpfr_prec_round (y, 25000, GMP_RNDN); |
| if (mpfr_cmp (x, y)) |
| { |
| printf ("const_log2: error for large prec\n"); |
| exit (1); |
| } |
| |
| /* worst-case with 15 successive ones after last bit, |
| to exercise can_round loop */ |
| mpfr_set_prec (x, 26249); |
| mpfr_const_log2 (x, GMP_RNDZ); |
| |
| mpfr_clears (x, y, (mpfr_ptr) 0); |
| } |
| |
| static void |
| check_cache (void) |
| { |
| mpfr_t x; |
| int i; |
| |
| mpfr_init2 (x, 195); |
| mpfr_free_cache (); |
| i = mpfr_const_log2 (x, GMP_RNDN); |
| if (i == 0) |
| { |
| printf("Error for log2. Invalid ternary value (1).\n"); |
| exit (1); |
| } |
| mpfr_set_prec (x, 194); |
| i = mpfr_const_log2 (x, GMP_RNDN); |
| if (i == 0) |
| { |
| printf("Error for log2. Invalid ternary value (2).\n"); |
| exit (1); |
| } |
| |
| mpfr_free_cache (); |
| mpfr_set_prec (x, 9); |
| mpfr_const_log2 (x, GMP_RNDN); |
| mpfr_set_prec (x, 8); |
| mpfr_const_log2 (x, GMP_RNDN); |
| if (mpfr_cmp_str (x, "0.10110001E0", 2, GMP_RNDN)) |
| { |
| printf("Error for log2. Wrong rounding.\n"); |
| exit (1); |
| } |
| |
| mpfr_clear (x); |
| } |
| |
| /* Wrapper for tgeneric */ |
| static int |
| my_const_log2 (mpfr_ptr x, mpfr_srcptr y, mp_rnd_t r) |
| { |
| return mpfr_const_log2 (x, r); |
| } |
| |
| #define RAND_FUNCTION(x) mpfr_set_ui ((x), 0, GMP_RNDN) |
| #define TEST_FUNCTION my_const_log2 |
| #include "tgeneric.c" |
| |
| int |
| main (int argc, char *argv[]) |
| { |
| mpfr_t x; |
| int p; |
| mp_rnd_t rnd; |
| |
| tests_start_mpfr (); |
| |
| p = (argc>1) ? atoi(argv[1]) : 53; |
| rnd = (argc>2) ? (mp_rnd_t) atoi(argv[2]) : GMP_RNDZ; |
| |
| mpfr_init (x); |
| |
| check (2, 1000); |
| |
| /* check precision of 2 bits */ |
| mpfr_set_prec (x, 2); |
| mpfr_const_log2 (x, GMP_RNDN); |
| if (mpfr_cmp_ui_2exp(x, 3, -2)) /* 3*2^-2 */ |
| { |
| printf ("mpfr_const_log2 failed for prec=2, rnd=GMP_RNDN\n" |
| "expected 0.75, got "); |
| mpfr_out_str(stdout, 10, 0, x, GMP_RNDN); |
| putchar('\n'); |
| exit (1); |
| } |
| |
| if (argc>=2) |
| { |
| mpfr_set_prec (x, p); |
| mpfr_const_log2 (x, rnd); |
| printf ("log(2)="); |
| mpfr_out_str (stdout, 10, 0, x, rnd); |
| puts (""); |
| } |
| |
| mpfr_set_prec (x, 53); |
| mpfr_const_log2 (x, GMP_RNDZ); |
| if (mpfr_cmp_str1 (x, "6.9314718055994530941e-1") ) |
| { |
| printf ("mpfr_const_log2 failed for prec=53\n"); |
| exit (1); |
| } |
| |
| mpfr_set_prec (x, 32); |
| mpfr_const_log2 (x, GMP_RNDN); |
| if (mpfr_cmp_str1 (x, "0.69314718060195446")) |
| { |
| printf ("mpfr_const_log2 failed for prec=32\n"); |
| exit (1); |
| } |
| |
| mpfr_clear(x); |
| |
| check_large(); |
| check_cache (); |
| |
| test_generic (2, 200, 1); |
| |
| tests_end_mpfr (); |
| return 0; |
| } |