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* tests/test-modf.h: New file. * tests/test-modf.c: Include <float.h> and test-modf.h. (main): Invoke test_function. * tests/test-modff.c: Include <float.h> and test-modf.h. (main): Invoke test_function. * tests/test-modfl.c: Include <float.h> and test-modf.h. (main): Invoke test_function. * modules/modf-tests (Files): Add tests/test-modf.h, tests/randomd.c. (Makefile.am): Add randomd.c to test_modf_SOURCES. * modules/modff-tests (Files): Add tests/test-modf.h, tests/randomf.c. (Makefile.am): Add randomf.c to test_modff_SOURCES. * modules/modfl-tests (Files): Add tests/test-modf.h, tests/randoml.c. (Depends-on): Add 'float'. (Makefile.am): Add randoml.c to test_modfl_SOURCES.
63 lines
1.8 KiB
C
63 lines
1.8 KiB
C
/* Test of modf*() function family.
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Copyright (C) 2012 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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static void
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test_function (void)
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{
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int i;
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const DOUBLE TWO_MANT_DIG =
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/* Assume MANT_DIG <= 5 * 31.
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Use the identity
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n = floor(n/5) + floor((n+1)/5) + ... + floor((n+4)/5). */
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(DOUBLE) (1U << ((MANT_DIG - 1) / 5))
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* (DOUBLE) (1U << ((MANT_DIG - 1 + 1) / 5))
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* (DOUBLE) (1U << ((MANT_DIG - 1 + 2) / 5))
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* (DOUBLE) (1U << ((MANT_DIG - 1 + 3) / 5))
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* (DOUBLE) (1U << ((MANT_DIG - 1 + 4) / 5));
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/* Randomized tests. */
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for (i = 0; i < SIZEOF (RANDOM); i++)
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{
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DOUBLE x = RANDOM[i]; /* 0.0 <= x < 1.0 */
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DOUBLE y;
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DOUBLE z;
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y = MODF (x, &z);
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ASSERT (z == L_(0.0));
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ASSERT (y == x);
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y = MODF (- x, &z);
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ASSERT (z == L_(0.0));
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ASSERT (y == - x);
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y = MODF (L_(1.0) + x, &z);
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ASSERT (z == L_(1.0));
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y -= x;
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ASSERT (y >= - L_(1.0) / TWO_MANT_DIG);
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ASSERT (y <= L_(1.0) / TWO_MANT_DIG);
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y = MODF (- L_(1.0) - x, &z);
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ASSERT (z == - L_(1.0));
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y -= - x;
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ASSERT (y >= - L_(1.0) / TWO_MANT_DIG);
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ASSERT (y <= L_(1.0) / TWO_MANT_DIG);
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}
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}
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volatile DOUBLE x;
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DOUBLE y;
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DOUBLE z;
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