Mercurial > gnulib
view tests/test-ilogb.h @ 40190:ef116535bf1a
relocatable-prog: Use $ORIGIN trick on more platforms.
* m4/relocatable.m4 (gl_RELOCATABLE_BODY): Use $ORIGIN trick also on
FreeBSD >= 7.3, DragonFly >= 3.0, NetBSD >= 8.0, OpenBSD >= 5.4,
Solaris >= 10, Haiku. But don't use it on Android.
* build-aux/reloc-ldflags: Allow the use of the $ORIGIN trick also on
Hurd, FreeBSD, DragonFly, NetBSD, OpenBSD, Solaris, Haiku.
author | Bruno Haible <bruno@clisp.org> |
---|---|
date | Wed, 20 Feb 2019 02:39:52 +0100 |
parents | b06060465f09 |
children |
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/* Test of ilogb*() function family. Copyright (C) 2012-2019 Free Software Foundation, Inc. This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program 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 General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <https://www.gnu.org/licenses/>. */ static DOUBLE my_ldexp (DOUBLE x, int d) { for (; d > 0; d--) x *= L_(2.0); for (; d < 0; d++) x *= L_(0.5); return x; } static void test_function (void) { int i; VOLATILE DOUBLE x; int y; /* Some particular values. */ x = L_(0.6); y = ILOGB (x); ASSERT (y == -1); x = L_(1.2); y = ILOGB (x); ASSERT (y == 0); x = L_(2.1); y = ILOGB (x); ASSERT (y == 1); x = L_(3.9); y = ILOGB (x); ASSERT (y == 1); x = L_(4.0); y = ILOGB (x); ASSERT (y == (FLT_RADIX == 2 ? 2 : 1)); x = L_(0.25); y = ILOGB (x); ASSERT (y == (FLT_RADIX == 2 ? -2 : -1)); /* Zero. */ ASSERT (ILOGB (L_(0.0)) == FP_ILOGB0); ASSERT (ILOGB (MINUS_ZERO) == FP_ILOGB0); /* Infinity. */ ASSERT (ILOGB (INFINITY) == INT_MAX); ASSERT (ILOGB (- INFINITY) == INT_MAX); /* NaN. */ ASSERT (ILOGB (NAN) == FP_ILOGBNAN); /* From here on, this test assumes FLT_RADIX == 2. */ for (i = 1, x = L_(1.0); i <= MAX_EXP; i++, x *= L_(2.0)) { y = ILOGB (x); ASSERT (y == i - 1); } for (i = 1, x = L_(1.0); i >= MIN_NORMAL_EXP; i--, x *= L_(0.5)) { y = ILOGB (x); ASSERT (y == i - 1); } for (; i >= MIN_EXP - 100 && x > L_(0.0); i--, x *= L_(0.5)) { y = ILOGB (x); ASSERT (y == i - 1); } for (i = 1, x = - L_(1.0); i <= MAX_EXP; i++, x *= L_(2.0)) { y = ILOGB (x); ASSERT (y == i - 1); } for (i = 1, x = - L_(1.0); i >= MIN_NORMAL_EXP; i--, x *= L_(0.5)) { y = ILOGB (x); ASSERT (y == i - 1); } for (; i >= MIN_EXP - 100 && x < L_(0.0); i--, x *= L_(0.5)) { y = ILOGB (x); ASSERT (y == i - 1); } for (i = 1, x = L_(1.01); i <= MAX_EXP; i++, x *= L_(2.0)) { y = ILOGB (x); ASSERT (y == i - 1); } for (i = 1, x = L_(1.01); i >= MIN_NORMAL_EXP; i--, x *= L_(0.5)) { y = ILOGB (x); ASSERT (y == i - 1); } for (; i >= MIN_EXP - 100 && x > L_(0.0); i--, x *= L_(0.5)) { y = ILOGB (x); ASSERT (y == i - 1); } for (i = 1, x = L_(1.73205); i <= MAX_EXP; i++, x *= L_(2.0)) { y = ILOGB (x); ASSERT (y == i - 1); } for (i = 1, x = L_(1.73205); i >= MIN_NORMAL_EXP; i--, x *= L_(0.5)) { y = ILOGB (x); ASSERT (y == i - 1); } for (; i >= MIN_EXP - 100 && x > L_(0.0); i--, x *= L_(0.5)) { y = ILOGB (x); ASSERT (y == i - 1 || y == i); } /* Randomized tests. */ for (i = 0; i < SIZEOF (RANDOM); i++) { x = L_(20.0) * RANDOM[i] - L_(10.0); /* -10.0 <= x <= 10.0 */ if (x != L_(0.0)) { DOUBLE abs_x = (x < L_(0.0) ? - x : x); y = ILOGB (x); ASSERT (abs_x >= my_ldexp (L_(1.0), y)); ASSERT (abs_x < my_ldexp (L_(1.0), y + 1)); } } } volatile DOUBLE x; DOUBLE y;