/* Test file for mpfr_set_d and mpfr_get_d. Copyright 1999-2019 Free Software Foundation, Inc. Contributed by the AriC and Caramba 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 3 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.LESSER. If not, see http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */ #include #include "mpfr-test.h" int main (int argc, char *argv[]) { mpfr_t x, y, z; unsigned long k, n; volatile double d; double dd; 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 mpfr_init (x); #if !defined(MPFR_ERRDIVZERO) mpfr_set_nan (x); d = mpfr_get_d (x, MPFR_RNDN); if (! DOUBLE_ISNAN (d)) { printf ("ERROR for NAN (1)\n"); #ifdef MPFR_NANISNAN printf ("The reason is that NAN == NAN. Please look at the configure " "output\nand Section \"In case of problem\" of the INSTALL " "file.\n"); #endif exit (1); } mpfr_set_ui (x, 0, MPFR_RNDN); mpfr_set_d (x, d, MPFR_RNDN); if (! mpfr_nan_p (x)) { printf ("ERROR for NAN (2)\n"); #ifdef MPFR_NANISNAN printf ("The reason is that NAN == NAN. Please look at the configure " "output\nand Section \"In case of problem\" of the INSTALL " "file.\n"); #endif exit (1); } #endif /* MPFR_ERRDIVZERO */ #ifdef HAVE_SIGNEDZ d = 0.0; mpfr_set_d (x, d, MPFR_RNDN); MPFR_ASSERTN(mpfr_cmp_ui (x, 0) == 0 && MPFR_IS_POS(x)); d = -d; mpfr_set_d (x, d, MPFR_RNDN); if (mpfr_cmp_ui (x, 0) != 0 || MPFR_IS_POS(x)) { printf ("Error in mpfr_set_d on -0\n"); printf ("d = %g, x = ", d); mpfr_dump (x); exit (1); } #endif /* HAVE_SIGNEDZ */ #if !defined(MPFR_ERRDIVZERO) mpfr_set_inf (x, 1); d = mpfr_get_d (x, MPFR_RNDN); mpfr_set_ui (x, 0, MPFR_RNDN); mpfr_set_d (x, d, MPFR_RNDN); MPFR_ASSERTN(mpfr_inf_p (x) && mpfr_sgn (x) > 0); mpfr_set_inf (x, -1); d = mpfr_get_d (x, MPFR_RNDN); mpfr_set_ui (x, 0, MPFR_RNDN); mpfr_set_d (x, d, MPFR_RNDN); MPFR_ASSERTN(mpfr_inf_p (x) && mpfr_sgn (x) < 0); #endif /* MPFR_ERRDIVZERO */ mpfr_set_prec (x, 2); /* checks that subnormals are not flushed to zero */ d = DBL_MIN; /* 2^(-1022) */ for (n = 0; n < 53; n++, d /= 2.0) if (d != 0.0) /* should be 2^(-1022-n) */ { mpfr_set_d (x, d, MPFR_RNDN); if (mpfr_cmp_ui_2exp (x, 1, -1022-n)) { printf ("Wrong result for d=2^(%ld), ", -1022-n); printf ("got "); mpfr_out_str (stdout, 10, 10, x, MPFR_RNDN); printf ("\n"); mpfr_dump (x); exit (1); } } /* checks that rounds to nearest sets the last bit to zero in case of equal distance */ mpfr_set_d (x, 5.0, MPFR_RNDN); if (mpfr_cmp_ui (x, 4)) { printf ("Error in tset_d: expected 4.0, got "); mpfr_dump (x); exit (1); } mpfr_set_d (x, -5.0, MPFR_RNDN); if (mpfr_cmp_si (x, -4)) { printf ("Error in tset_d: expected -4.0, got "); mpfr_dump (x); exit (1); } mpfr_set_d (x, 9.84891017624509146344e-01, MPFR_RNDU); if (mpfr_cmp_ui (x, 1)) { printf ("Error in tset_d: expected 1.0, got "); mpfr_dump (x); exit (1); } mpfr_init2 (z, 32); mpfr_set_d (z, 1.0, (mpfr_rnd_t) 0); if (mpfr_cmp_ui (z, 1)) { mpfr_dump (z); printf ("Error: 1.0 != 1.0\n"); exit (1); } mpfr_set_prec (x, 53); mpfr_init2 (y, 53); mpfr_set_d (x, d=-1.08007920352320089721e+150, (mpfr_rnd_t) 0); if (mpfr_get_d1 (x) != d) { mpfr_dump (x); printf ("Error: get_d o set_d <> identity for d = %1.20e %1.20e\n", d, mpfr_get_d1 (x)); exit (1); } mpfr_set_d (x, 8.06294740693074521573e-310, (mpfr_rnd_t) 0); d = -6.72658901114033715233e-165; mpfr_set_d (x, d, (mpfr_rnd_t) 0); if (d != mpfr_get_d1 (x)) { mpfr_dump (x); printf ("Error: get_d o set_d <> identity for d = %1.20e %1.20e\n", d, mpfr_get_d1 (x)); exit (1); } n = (argc==1) ? 500000 : atoi(argv[1]); for (k = 1; k <= n; k++) { do { d = DBL_RAND (); } #ifdef HAVE_DENORMS while (0); #else while (ABS(d) < DBL_MIN); #endif mpfr_set_d (x, d, (mpfr_rnd_t) 0); dd = mpfr_get_d1 (x); if (d != dd && !(Isnan(d) && Isnan(dd))) { printf ("Mismatch on : %1.18g != %1.18g\n", d, mpfr_get_d1 (x)); mpfr_dump (x); exit (1); } } mpfr_clear (x); mpfr_clear (y); mpfr_clear (z); tests_end_mpfr (); return 0; }