| /* Test file for mpfr_get_d |
| |
| 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 <stdio.h> |
| #include <stdlib.h> |
| #include <float.h> |
| |
| #include "mpfr-test.h" |
| |
| static int |
| check_denorms (void) |
| { |
| mp_rnd_t rnd_mode; |
| mpfr_t x; |
| double d, d2, dd, f, dbl_min; |
| int fail = 0, k, n; |
| |
| /* workaround for gcc bug on m68040-unknown-netbsd1.4.1, |
| where DBL_MIN gives (1-2^(-52))/2^1022 */ |
| dbl_min = 1.0; |
| for (d = DBL_MIN; d < 0.9; d *= 2.0) |
| dbl_min /= 2.0; |
| |
| mpfr_init2 (x, BITS_PER_MP_LIMB); |
| |
| rnd_mode = GMP_RNDN; |
| for (k = -17; k <= 17; k += 2) |
| { |
| d = (double) k * dbl_min; /* k * 2^(-1022) */ |
| f = 1.0; |
| mpfr_set_si (x, k, GMP_RNDN); |
| mpfr_div_2exp (x, x, 1022, GMP_RNDN); /* k * 2^(-1022) */ |
| for (n = 0; n <= 58; n++) |
| { |
| d2 = d * f; |
| dd = mpfr_get_d (x, rnd_mode); |
| if (d2 != dd) /* should be k * 2^(-1022-n) for n < 53 */ |
| { |
| printf ("Wrong result for %d * 2^(%d), rnd_mode %d\n", |
| k, -1022-n, rnd_mode); |
| printf ("got %.20e instead of %.20e\n", dd, d2); |
| fail = 1; |
| } |
| f *= 0.5; |
| mpfr_div_2exp (x, x, 1, GMP_RNDN); |
| } |
| } |
| |
| mpfr_clear (x); |
| return fail; |
| } |
| |
| static void |
| check_inf_nan (void) |
| { |
| /* only if nans and infs are available */ |
| #if _GMP_IEEE_FLOATS |
| mpfr_t x; |
| double d; |
| |
| mpfr_init2 (x, 123); |
| |
| mpfr_set_inf (x, 1); |
| d = mpfr_get_d (x, GMP_RNDZ); |
| ASSERT_ALWAYS (d > 0); |
| ASSERT_ALWAYS (DOUBLE_ISINF (d)); |
| |
| mpfr_set_inf (x, -1); |
| d = mpfr_get_d (x, GMP_RNDZ); |
| ASSERT_ALWAYS (d < 0); |
| ASSERT_ALWAYS (DOUBLE_ISINF (d)); |
| |
| mpfr_set_nan (x); |
| d = mpfr_get_d (x, GMP_RNDZ); |
| ASSERT_ALWAYS (DOUBLE_ISNAN (d)); |
| |
| mpfr_clear (x); |
| #endif |
| } |
| |
| static void |
| check_max (void) |
| { |
| double d, e; |
| mpfr_t u; |
| |
| d = 1.0; |
| while (d < (DBL_MAX / 2.0)) |
| d += d; |
| mpfr_init (u); |
| if (mpfr_set_d (u, d, GMP_RNDN) == 0) |
| { |
| /* If setting is exact */ |
| e = (mpfr_get_d1) (u); |
| if (e != d) |
| { |
| printf ("get_d(set_d)(1): %1.20e != %1.20e\n", d, e); |
| exit (1); |
| } |
| } |
| |
| mpfr_set_str_binary (u, "-1E1024"); |
| d = mpfr_get_d (u, GMP_RNDZ); |
| MPFR_ASSERTN(d == -DBL_MAX); |
| d = mpfr_get_d (u, GMP_RNDU); |
| MPFR_ASSERTN(d == -DBL_MAX); |
| d = mpfr_get_d (u, GMP_RNDN); |
| MPFR_ASSERTN(DOUBLE_ISINF(d) && d < 0.0); |
| d = mpfr_get_d (u, GMP_RNDD); |
| MPFR_ASSERTN(DOUBLE_ISINF(d) && d < 0.0); |
| |
| mpfr_set_str_binary (u, "1E1024"); |
| d = mpfr_get_d (u, GMP_RNDZ); |
| MPFR_ASSERTN(d == DBL_MAX); |
| d = mpfr_get_d (u, GMP_RNDD); |
| MPFR_ASSERTN(d == DBL_MAX); |
| d = mpfr_get_d (u, GMP_RNDN); |
| MPFR_ASSERTN(DOUBLE_ISINF(d) && d > 0.0); |
| d = mpfr_get_d (u, GMP_RNDU); |
| MPFR_ASSERTN(DOUBLE_ISINF(d) && d > 0.0); |
| |
| mpfr_clear (u); |
| } |
| |
| static void |
| check_min(void) |
| { |
| double d, e; |
| mpfr_t u; |
| |
| d = 1.0; while (d > (DBL_MIN * 2.0)) d /= 2.0; |
| mpfr_init(u); |
| if (mpfr_set_d(u, d, GMP_RNDN) == 0) |
| { |
| /* If setting is exact */ |
| e = mpfr_get_d1(u); |
| if (e != d) |
| { |
| printf("get_d(set_d)(2): %1.20e != %1.20e\n", d, e); |
| exit(1); |
| } |
| } |
| mpfr_clear(u); |
| } |
| |
| int |
| main (void) |
| { |
| tests_start_mpfr (); |
| mpfr_test_init (); |
| |
| #ifndef MPFR_DOUBLE_SPEC |
| printf ("Warning! The MPFR_DOUBLE_SPEC macro is not defined. This means\n" |
| "that you do not have a conforming C implementation and problems\n" |
| "may occur with conversions between MPFR numbers and standard\n" |
| "floating-point types. Please contact the MPFR team.\n"); |
| #elif MPFR_DOUBLE_SPEC == 0 |
| /* |
| printf ("The type 'double' of your C implementation does not seem to\n" |
| "correspond to the IEEE-754 double precision. Though code has\n" |
| "been written to support such implementations, tests have been\n" |
| "done only on IEEE-754 double-precision implementations and\n" |
| "conversions between MPFR numbers and standard floating-point\n" |
| "types may be inaccurate. You may wish to contact the MPFR team\n" |
| "for further testing.\n"); |
| */ |
| printf ("The type 'double' of your C implementation does not seem to\n" |
| "correspond to the IEEE-754 double precision. Such particular\n" |
| "implementations are not supported yet, and conversions between\n" |
| "MPFR numbers and standard floating-point types may be very\n" |
| "inaccurate.\n"); |
| printf ("FLT_RADIX = %ld\n", (long) FLT_RADIX); |
| printf ("DBL_MANT_DIG = %ld\n", (long) DBL_MANT_DIG); |
| printf ("DBL_MIN_EXP = %ld\n", (long) DBL_MIN_EXP); |
| printf ("DBL_MAX_EXP = %ld\n", (long) DBL_MAX_EXP); |
| #endif |
| |
| if (check_denorms ()) |
| exit (1); |
| |
| check_inf_nan (); |
| check_min(); |
| check_max(); |
| |
| tests_end_mpfr (); |
| return 0; |
| } |