static void check_inf_nan (void) { /* only if nans and infs are available */ #if _GMP_IEEE_FLOATS mpfr_t x; double d; long exp; mpfr_init2 (x, 123); mpfr_set_inf (x, 1); d = (double) mpfr_get_ld_2exp (&exp, x, MPFR_RNDZ); ASSERT_ALWAYS (d > 0); ASSERT_ALWAYS (DOUBLE_ISINF (d)); mpfr_set_inf (x, -1); d = (double) mpfr_get_ld_2exp (&exp, x, MPFR_RNDZ); ASSERT_ALWAYS (d < 0); ASSERT_ALWAYS (DOUBLE_ISINF (d)); mpfr_set_nan (x); d = (double) mpfr_get_ld_2exp (&exp, x, MPFR_RNDZ); ASSERT_ALWAYS (DOUBLE_ISNAN (d)); mpfr_clear (x); #endif }
static void check_inf_nan (void) { #if !defined(MPFR_ERRDIVZERO) mpfr_t x; double d; long exp; mpfr_init2 (x, 123); mpfr_set_inf (x, 1); d = (double) mpfr_get_ld_2exp (&exp, x, MPFR_RNDZ); MPFR_ASSERTN (d > 0); MPFR_ASSERTN (DOUBLE_ISINF (d)); mpfr_set_inf (x, -1); d = (double) mpfr_get_ld_2exp (&exp, x, MPFR_RNDZ); MPFR_ASSERTN (d < 0); MPFR_ASSERTN (DOUBLE_ISINF (d)); mpfr_set_nan (x); d = (double) mpfr_get_ld_2exp (&exp, x, MPFR_RNDZ); MPFR_ASSERTN (DOUBLE_ISNAN (d)); mpfr_clear (x); #endif }
/* Check that hardware rounding doesn't make mpfr_get_ld_2exp return a value outside its defined range. */ static void check_round (void) { static const unsigned long data[] = {1, 32, 53, 54, 63, 64, 65, 127, 128, 256, 512 }; mpfr_t f; long double got; long got_exp; int i, rnd_mode, neg; mpfr_init2 (f, 1024L); for (rnd_mode = 0; rnd_mode < MPFR_RND_MAX ; rnd_mode++) { for (i = 0; i < (int) numberof (data); i++) { mpfr_set_ui (f, 1L, MPFR_RNDZ); mpfr_mul_2exp (f, f, data[i], MPFR_RNDZ); mpfr_sub_ui (f, f, 1L, MPFR_RNDZ); for (neg = 0; neg <= 1; neg++) { got = mpfr_get_ld_2exp (&got_exp, f, (mpfr_rnd_t) rnd_mode); if (neg == 0 ? (got < 0.5 || got >= 1.0) : (got <= -1.0 || got > -0.5)) { printf ("mpfr_get_ld_2exp wrong on 2**%lu-1\n", data[i]); printf ("result out of range, expect 0.5 <= got < 1.0\n"); printf (" rnd_mode = %d\n", rnd_mode); printf (" data[i] = %lu\n", data[i]); printf (" f "); mpfr_out_str (stdout, 2, 0, f, MPFR_RNDN); printf ("\n"); d_trace (" got ", got); printf (" got exp %ld\n", got_exp); exit(1); } mpfr_neg (f, f, MPFR_RNDZ); } } } mpfr_clear (f); }