--- /dev/null
+/* Test file for mpfr_set_ld and mpfr_get_ld.
+
+Copyright 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 <limits.h>
+#ifdef WITH_FPU_CONTROL
+#include <fpu_control.h>
+#endif
+
+#include "mpfr-test.h"
+
+static void
+check_gcc33_bug (void)
+{
+ volatile long double x;
+ x = (long double) 9007199254740992.0 + 1.0;
+ if (x != 0.0)
+ return; /* OK */
+ printf
+ ("Detected optimization bug of gcc 3.3 on Alpha concerning long double\n"
+ "comparisons; set_ld tests are disabled (set_ld won't work correctly).\n"
+ "See http://gcc.gnu.org/ml/gcc-bugs/2003-10/msg00853.html for more\n"
+ "information on this bug.\n");
+ exit (0); /* This is not a bug in MPFR, so don't fail. */
+}
+
+static int
+Isnan_ld (long double d)
+{
+ double e = (double) d;
+ if (DOUBLE_ISNAN (e))
+ return 1;
+ LONGDOUBLE_NAN_ACTION (d, goto yes);
+ return 0;
+ yes:
+ return 1;
+}
+
+/* checks that a long double converted to a mpfr (with precision >=113),
+ then converted back to a long double gives the initial value,
+ or in other words mpfr_get_ld(mpfr_set_ld(d)) = d.
+*/
+static void
+check_set_get (long double d, mpfr_t x)
+{
+ int r;
+ long double e;
+ int inex;
+
+ for (r = 0; r < GMP_RND_MAX; r++)
+ {
+ inex = mpfr_set_ld (x, d, (mp_rnd_t) r);
+ if (inex != 0)
+ {
+ printf ("Error: mpfr_set_ld should be exact\n");
+ printf ("d=%1.30Le inex=%d\n", d, inex);
+ printf ("emin=%ld emax=%ld\n", mpfr_get_emin (), mpfr_get_emax ());
+ mpfr_dump (x);
+ exit (1);
+ }
+ e = mpfr_get_ld (x, (mp_rnd_t) r);
+ if ((Isnan_ld(d) && ! Isnan_ld(e)) ||
+ (Isnan_ld(e) && ! Isnan_ld(d)) ||
+ (e != d && !(Isnan_ld(e) && Isnan_ld(d))))
+ {
+ printf ("Error: mpfr_get_ld o mpfr_set_ld <> Id\n");
+ printf (" r=%d\n", r);
+ printf (" d=%1.30Le get_ld(set_ld(d))=%1.30Le\n", d, e);
+ ld_trace (" d", d);
+ printf (" x="); mpfr_out_str (NULL, 16, 0, x, GMP_RNDN);
+ printf ("\n");
+ ld_trace (" e", e);
+#ifdef MPFR_NANISNAN
+ if (Isnan_ld(d) || Isnan_ld(e))
+ 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);
+ }
+ }
+}
+
+static void
+test_small (void)
+{
+ mpfr_t x, y, z;
+ long double d;
+
+ mpfr_init2 (x, 64);
+ mpfr_init2 (y, 64);
+ mpfr_init2 (z, 64);
+
+ /* x = 11906603631607553907/2^(16381+64) */
+ mpfr_set_str (x, "0.1010010100111100110000001110101101000111010110000001111101110011E-16381", 2, GMP_RNDN);
+ d = mpfr_get_ld (x, GMP_RNDN); /* infinite loop? */
+ mpfr_set_ld (y, d, GMP_RNDN);
+ mpfr_sub (z, x, y, GMP_RNDN);
+ mpfr_abs (z, z, GMP_RNDN);
+ mpfr_clear_erangeflag ();
+ /* If long double = double, d should be equal to 0;
+ in this case, everything is OK. */
+ if (d != 0 && (mpfr_cmp_str (z, "1E-16434", 2, GMP_RNDN) > 0 ||
+ mpfr_erangeflag_p ()))
+ {
+ printf ("Error with x = ");
+ mpfr_out_str (NULL, 10, 21, x, GMP_RNDN);
+ printf (" = ");
+ mpfr_out_str (NULL, 16, 0, x, GMP_RNDN);
+ printf ("\n -> d = %.21Lg", d);
+ printf ("\n -> y = ");
+ mpfr_out_str (NULL, 10, 21, y, GMP_RNDN);
+ printf (" = ");
+ mpfr_out_str (NULL, 16, 0, y, GMP_RNDN);
+ printf ("\n -> |x-y| = ");
+ mpfr_out_str (NULL, 16, 0, z, GMP_RNDN);
+ printf ("\n");
+ exit (1);
+ }
+
+ mpfr_clear (x);
+ mpfr_clear (y);
+ mpfr_clear (z);
+}
+
+int
+main (int argc, char *argv[])
+{
+ long double d, e;
+ mpfr_t x;
+ int i;
+ mp_exp_t emax;
+#ifdef WITH_FPU_CONTROL
+ fpu_control_t cw;
+
+ if (argc > 1)
+ {
+ cw = strtol(argv[1], NULL, 0);
+ printf ("FPU control word: 0x%x\n", (unsigned int) cw);
+ _FPU_SETCW (cw);
+ }
+#endif
+
+ check_gcc33_bug ();
+
+ tests_start_mpfr ();
+ mpfr_test_init ();
+
+ mpfr_init2 (x, MPFR_LDBL_MANT_DIG);
+
+ /* check NaN */
+ mpfr_set_nan (x);
+ d = mpfr_get_ld (x, GMP_RNDN);
+ check_set_get (d, x);
+
+ /* check +0.0 and -0.0 */
+ d = 0.0;
+ check_set_get (d, x);
+ d = DBL_NEG_ZERO;
+ check_set_get (d, x);
+
+ /* check that the sign of -0.0 is set */
+ mpfr_set_ld (x, DBL_NEG_ZERO, GMP_RNDN);
+ if (MPFR_SIGN(x) > 0)
+ {
+ printf ("Error: sign of -0.0 is not set correctly\n");
+#ifdef _GMP_IEEE_FLOATS
+ exit (1);
+ /* Non IEEE doesn't support negative zero yet */
+#endif
+ }
+
+ /* check +Inf */
+ mpfr_set_inf (x, 1);
+ d = mpfr_get_ld (x, GMP_RNDN);
+ check_set_get (d, x);
+
+ /* check -Inf */
+ mpfr_set_inf (x, -1);
+ d = mpfr_get_ld (x, GMP_RNDN);
+ check_set_get (d, x);
+
+ /* check the largest power of two */
+ d = 1.0; while (d < LDBL_MAX / 2.0) d += d;
+ check_set_get (d, x);
+ check_set_get (-d, x);
+
+ /* check largest long double */
+ d = LDBL_MAX;
+ check_set_get (d, x);
+ check_set_get (-d, x);
+
+ /* check the smallest power of two */
+ d = 1.0;
+ while ((e = d / 2.0) != (long double) 0.0 && e != d)
+ d = e;
+ check_set_get (d, x);
+ check_set_get (-d, x);
+
+ /* check largest 2^(2^k) that is representable as a long double */
+ d = (LDBL_MAX / 2) + (LDBL_MAX / 4 * LDBL_EPSILON);
+ check_set_get (d, x);
+
+ /* check that 2^i, 2^i+1 and 2^i-1 are correctly converted */
+ d = 1.0;
+ for (i = 1; i < MPFR_LDBL_MANT_DIG; i++)
+ {
+ d = 2.0 * d; /* d = 2^i */
+ check_set_get (d, x);
+ check_set_get (d + 1.0, x);
+ check_set_get (d - 1.0, x);
+ }
+
+ for (i = 0; i < 10000; i++)
+ {
+ mpfr_urandomb (x, RANDS);
+ d = mpfr_get_ld (x, GMP_RNDN);
+ check_set_get (d, x);
+ }
+
+ /* check with reduced emax to exercise overflow */
+ emax = mpfr_get_emax ();
+ mpfr_set_prec (x, 2);
+ set_emax (1);
+ mpfr_set_ld (x, (long double) 2.0, GMP_RNDN);
+ MPFR_ASSERTN(mpfr_inf_p (x) && mpfr_sgn (x) > 0);
+ for (d = (long double) 2.0, i = 0; i < 13; i++, d *= d);
+ /* now d = 2^8192 */
+ mpfr_set_ld (x, d, GMP_RNDN);
+ MPFR_ASSERTN(mpfr_inf_p (x) && mpfr_sgn (x) > 0);
+ set_emax (emax);
+
+ mpfr_clear (x);
+
+ test_small ();
+
+ tests_end_mpfr ();
+
+ return 0;
+}
projects / msp430-gcc.git / blobdiff