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- /* ieee-utils/test.c
- *
- * Copyright (C) 1996, 1997, 1998, 1999, 2000 Brian Gough
- *
- * 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 2 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, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
- #include <config.h>
- #include <stdlib.h>
- #include <math.h>
- #include <float.h>
- #include <string.h>
- #include <gsl/gsl_ieee_utils.h>
- #include <gsl/gsl_test.h>
-
- #if defined(HAVE_IRIX_IEEE_INTERFACE)
- /* don't test denormals on IRIX */
- #else
- #define TEST_DENORMAL 1
- #endif
-
- int
- main (void)
- {
- float zerof = 0.0f, minus_onef = -1.0f ;
- double zero = 0.0, minus_one = -1.0 ;
-
- /* Check for +ZERO (float) */
-
- {
- float f = 0.0f;
- const char mantissa[] = "00000000000000000000000";
- gsl_ieee_float_rep r;
- gsl_ieee_float_to_rep (&f, &r);
-
- gsl_test_int (r.sign, 0, "float x = 0, sign is +");
- gsl_test_int (r.exponent, -127, "float x = 0, exponent is -127");
- gsl_test_str (r.mantissa, mantissa, "float x = 0, mantissa");
- gsl_test_int (r.type, GSL_IEEE_TYPE_ZERO, "float x = 0, type is ZERO");
- }
-
- /* Check for -ZERO (float) */
-
- {
- float f = minus_onef;
- const char mantissa[] = "00000000000000000000000";
- gsl_ieee_float_rep r;
-
- while (f < 0) {
- f *= 0.1f;
- }
-
- gsl_ieee_float_to_rep (&f, &r);
-
- gsl_test_int (r.sign, 1, "float x = -1*0, sign is -");
- gsl_test_int (r.exponent, -127, "float x = -1*0, exponent is -127");
- gsl_test_str (r.mantissa, mantissa, "float x = -1*0, mantissa");
- gsl_test_int (r.type, GSL_IEEE_TYPE_ZERO, "float x = -1*0, type is ZERO");
- }
-
- /* Check for a positive NORMAL number (e.g. 2.1) (float) */
-
- {
- float f = 2.1f;
- const char mantissa[] = "00001100110011001100110";
-
- gsl_ieee_float_rep r;
- gsl_ieee_float_to_rep (&f, &r);
-
- gsl_test_int (r.sign, 0, "float x = 2.1, sign is +");
- gsl_test_int (r.exponent, 1, "float x = 2.1, exponent is 1");
- gsl_test_str (r.mantissa, mantissa, "float x = 2.1, mantissa");
- gsl_test_int (r.type, GSL_IEEE_TYPE_NORMAL, "float x = 2.1, type is NORMAL");
- }
-
-
- /* Check for a negative NORMAL number (e.g. -1.3304...) (float) */
-
- {
- float f = -1.3303577090924210f ;
- const char mantissa[] = "01010100100100100101001";
-
- gsl_ieee_float_rep r;
- gsl_ieee_float_to_rep (&f, &r);
-
- gsl_test_int (r.sign, 1, "float x = -1.3304..., sign is -");
- gsl_test_int (r.exponent, 0, "float x = -1.3304..., exponent is 0");
- gsl_test_str (r.mantissa, mantissa, "float x = -1.3304..., mantissa");
- gsl_test_int (r.type, GSL_IEEE_TYPE_NORMAL,
- "float x = -1.3304..., type is NORMAL");
- }
-
- /* Check for a large positive NORMAL number (e.g. 3.37e31) (float) */
-
- {
- float f = 3.37e31f;
- const char mantissa[] = "10101001010110101001001";
- gsl_ieee_float_rep r;
- gsl_ieee_float_to_rep (&f, &r);
-
- gsl_test_int (r.sign, 0, "float x = 3.37e31, sign is +");
- gsl_test_int (r.exponent, 104, "float x = 3.37e31, exponent is 104");
- gsl_test_str (r.mantissa, mantissa, "float x = 3.37e31, mantissa");
- gsl_test_int (r.type, GSL_IEEE_TYPE_NORMAL, "float x = 3.37e31, type is NORMAL");
- }
-
- /* Check for a small positive NORMAL number (e.g. 3.37e-31) (float) */
-
- {
- float f = 3.37e-31f;
- const char mantissa[] = "10110101011100110111011";
-
- gsl_ieee_float_rep r;
- gsl_ieee_float_to_rep (&f, &r);
-
- gsl_test_int (r.sign, 0, "float x = 3.37e-31, sign is +");
- gsl_test_int (r.exponent, -102, "float x = 3.37e-31, exponent is -102");
- gsl_test_str (r.mantissa, mantissa, "float x = 3.37e-31, mantissa");
- gsl_test_int (r.type, GSL_IEEE_TYPE_NORMAL,
- "float x = 3.37e-31, type is NORMAL");
- }
-
- /* Check for FLT_MIN (smallest possible number that is not denormal) */
-
- {
- float f = 1.17549435e-38f; /* FLT_MIN (float) */
- const char mantissa[] = "00000000000000000000000";
- gsl_ieee_float_rep r;
- gsl_ieee_float_to_rep (&f, &r);
-
- gsl_test_int (r.sign, 0, "float x = FLT_MIN, sign is +");
- gsl_test_int (r.exponent, -126, "float x = FLT_MIN, exponent is -126");
- gsl_test_str (r.mantissa, mantissa, "float x = FLT_MIN, mantissa");
- gsl_test_int (r.type, GSL_IEEE_TYPE_NORMAL, "float x = FLT_MIN, type is NORMAL");
- }
-
- /* Check for FLT_MAX (largest possible number that is not Inf) */
-
- {
- float f = 3.40282347e+38f; /* FLT_MAX */
- const char mantissa[] = "11111111111111111111111";
-
- gsl_ieee_float_rep r;
- gsl_ieee_float_to_rep (&f, &r);
-
- gsl_test_int (r.sign, 0, "float x = FLT_MAX, sign is +");
- gsl_test_int (r.exponent, 127, "float x = FLT_MAX, exponent is 127");
- gsl_test_str (r.mantissa, mantissa, "float x = FLT_MAX, mantissa");
- gsl_test_int (r.type, GSL_IEEE_TYPE_NORMAL, "float x = FLT_MAX, type is NORMAL");
- }
-
-
- /* Check for DENORMAL numbers (e.g. FLT_MIN/2^n) */
-
- #ifdef TEST_DENORMAL
- {
- float f = 1.17549435e-38f; /* FLT_MIN */
- char mantissa[] = "10000000000000000000000";
-
- int i;
- gsl_ieee_float_rep r;
-
- for (i = 0; i < 23; i++)
- {
- float x = f / (float)pow (2.0, 1 + (float) i);
- mantissa[i] = '1';
- gsl_ieee_float_to_rep (&x, &r);
-
- gsl_test_int (r.sign, 0, "float x = FLT_MIN/2^%d, sign is +", i + 1);
- gsl_test_int (r.exponent, -127,
- "float x = FLT_MIN/2^%d, exponent is -127", i + 1);
- gsl_test_str (r.mantissa, mantissa,
- "float x = FLT_MIN/2^%d, mantissa", i + 1);
- gsl_test_int (r.type, GSL_IEEE_TYPE_DENORMAL,
- "float x = FLT_MIN/2^%d, type is DENORMAL", i + 1);
- mantissa[i] = '0';
- }
- }
- #endif
-
- /* Check for positive INFINITY (e.g. 2*FLT_MAX) */
-
- {
- float f = 3.40282347e+38f; /* FLT_MAX */
- const char mantissa[] = "00000000000000000000000";
-
- gsl_ieee_float_rep r;
-
- float x;
- x = 2 * f;
- gsl_ieee_float_to_rep (&x, &r);
-
- gsl_test_int (r.sign, 0, "float x = 2*FLT_MAX, sign is +");
- gsl_test_int (r.exponent, 128, "float x = 2*FLT_MAX, exponent is 128");
- gsl_test_str (r.mantissa, mantissa, "float x = 2*FLT_MAX, mantissa");
- gsl_test_int (r.type, GSL_IEEE_TYPE_INF, "float x = -2*FLT_MAX, type is INF");
- }
-
- /* Check for negative INFINITY (e.g. -2*FLT_MAX) */
-
- {
- float f = 3.40282347e+38f; /* FLT_MAX */
- const char mantissa[] = "00000000000000000000000";
-
- gsl_ieee_float_rep r;
-
- float x;
- x = -2 * f;
- gsl_ieee_float_to_rep (&x, &r);
-
- gsl_test_int (r.sign, 1, "float x = -2*FLT_MAX, sign is -");
- gsl_test_int (r.exponent, 128, "float x = -2*FLT_MAX, exponent is 128");
- gsl_test_str (r.mantissa, mantissa, "float x = -2*FLT_MAX, mantissa");
- gsl_test_int (r.type, GSL_IEEE_TYPE_INF, "float x = -2*FLT_MAX, type is INF");
- }
-
- /* Check for NAN (e.g. Inf - Inf) (float) */
-
- {
- gsl_ieee_float_rep r;
- float x = 1.0f, y = 2.0f, z = zerof;
-
- x = x / z;
- y = y / z;
- z = y - x;
-
- gsl_ieee_float_to_rep (&z, &r);
-
- /* We don't check the sign and we don't check the mantissa because
- they could be anything for a NaN */
-
- gsl_test_int (r.exponent, 128, "float x = NaN, exponent is 128");
- gsl_test_int (r.type, GSL_IEEE_TYPE_NAN, "float x = NaN, type is NAN");
- }
-
-
- /* Check for +ZERO */
-
- {
- double d = 0.0;
- const char mantissa[]
- = "0000000000000000000000000000000000000000000000000000";
- gsl_ieee_double_rep r;
- gsl_ieee_double_to_rep (&d, &r);
-
- gsl_test_int (r.sign, 0, "double x = 0, sign is +");
- gsl_test_int (r.exponent, -1023, "double x = 0, exponent is -1023");
- gsl_test_str (r.mantissa, mantissa, "double x = 0, mantissa");
- gsl_test_int (r.type, GSL_IEEE_TYPE_ZERO, "double x = 0, type is ZERO");
- }
-
- /* Check for -ZERO */
-
- {
- double d = minus_one;
- const char mantissa[]
- = "0000000000000000000000000000000000000000000000000000";
- gsl_ieee_double_rep r;
-
- while (d < 0) {
- d *= 0.1;
- }
-
- gsl_ieee_double_to_rep (&d, &r);
-
- gsl_test_int (r.sign, 1, "double x = -1*0, sign is -");
- gsl_test_int (r.exponent, -1023, "double x = -1*0, exponent is -1023");
- gsl_test_str (r.mantissa, mantissa, "double x = -1*0, mantissa");
- gsl_test_int (r.type, GSL_IEEE_TYPE_ZERO, "double x = -1*0, type is ZERO");
- }
-
- /* Check for a positive NORMAL number (e.g. 2.1) */
-
- {
- double d = 2.1;
- const char mantissa[]
- = "0000110011001100110011001100110011001100110011001101";
- gsl_ieee_double_rep r;
- gsl_ieee_double_to_rep (&d, &r);
-
- gsl_test_int (r.sign, 0, "double x = 2.1, sign is +");
- gsl_test_int (r.exponent, 1, "double x = 2.1, exponent is 1");
- gsl_test_str (r.mantissa, mantissa, "double x = 2.1, mantissa");
- gsl_test_int (r.type, GSL_IEEE_TYPE_NORMAL, "double x = 2.1, type is NORMAL");
- }
-
-
- /* Check for a negative NORMAL number (e.g. -1.3304...) */
-
- {
- double d = -1.3303577090924210146738460025517269968986511230468750;
- const char mantissa[]
- = "0101010010010010010100101010010010001000100011101110";
- gsl_ieee_double_rep r;
- gsl_ieee_double_to_rep (&d, &r);
-
- gsl_test_int (r.sign, 1, "double x = -1.3304..., sign is -");
- gsl_test_int (r.exponent, 0, "double x = -1.3304..., exponent is 0");
- gsl_test_str (r.mantissa, mantissa, "double x = -1.3304..., mantissa");
- gsl_test_int (r.type, GSL_IEEE_TYPE_NORMAL,
- "double x = -1.3304..., type is NORMAL");
- }
-
- /* Check for a large positive NORMAL number (e.g. 3.37e297) */
-
- {
- double d = 3.37e297;
- const char mantissa[]
- = "0100100111001001100101111001100000100110011101000100";
- gsl_ieee_double_rep r;
- gsl_ieee_double_to_rep (&d, &r);
-
- gsl_test_int (r.sign, 0, "double x = 3.37e297, sign is +");
- gsl_test_int (r.exponent, 988, "double x = 3.37e297, exponent is 998");
- gsl_test_str (r.mantissa, mantissa, "double x = 3.37e297, mantissa");
- gsl_test_int (r.type, GSL_IEEE_TYPE_NORMAL,
- "double x = 3.37e297, type is NORMAL");
- }
-
- /* Check for a small positive NORMAL number (e.g. 3.37e-297) */
-
- {
- double d = 3.37e-297;
- const char mantissa[]
- = "0001101000011011101011100001110010100001001100110111";
- gsl_ieee_double_rep r;
- gsl_ieee_double_to_rep (&d, &r);
-
- gsl_test_int (r.sign, 0, "double x = 3.37e-297, sign is +");
- gsl_test_int (r.exponent, -985, "double x = 3.37e-297, exponent is -985");
- gsl_test_str (r.mantissa, mantissa, "double x = 3.37e-297, mantissa");
- gsl_test_int (r.type, GSL_IEEE_TYPE_NORMAL,
- "double x = 3.37e-297, type is NORMAL");
- }
-
- /* Check for DBL_MIN (smallest possible number that is not denormal) */
-
- {
- double d = 2.2250738585072014e-308; /* DBL_MIN */
- const char mantissa[]
- = "0000000000000000000000000000000000000000000000000000";
- gsl_ieee_double_rep r;
- gsl_ieee_double_to_rep (&d, &r);
-
- gsl_test_int (r.sign, 0, "double x = DBL_MIN, sign is +");
- gsl_test_int (r.exponent, -1022, "double x = DBL_MIN, exponent is -1022");
- gsl_test_str (r.mantissa, mantissa, "double x = DBL_MIN, mantissa");
- gsl_test_int (r.type, GSL_IEEE_TYPE_NORMAL,
- "double x = DBL_MIN, type is NORMAL");
- }
-
- /* Check for DBL_MAX (largest possible number that is not Inf) */
-
- {
- double d = 1.7976931348623157e+308; /* DBL_MAX */
- const char mantissa[]
- = "1111111111111111111111111111111111111111111111111111";
- gsl_ieee_double_rep r;
- gsl_ieee_double_to_rep (&d, &r);
-
- gsl_test_int (r.sign, 0, "double x = DBL_MAX, sign is +");
- gsl_test_int (r.exponent, 1023, "double x = DBL_MAX, exponent is 1023");
- gsl_test_str (r.mantissa, mantissa, "double x = DBL_MAX, mantissa");
- gsl_test_int (r.type, GSL_IEEE_TYPE_NORMAL,
- "double x = DBL_MAX, type is NORMAL");
- }
-
- /* Check for DENORMAL numbers (e.g. DBL_MIN/2^n) */
-
- #ifdef TEST_DENORMAL
- {
- double d = 2.2250738585072014e-308; /* DBL_MIN */
- char mantissa[]
- = "1000000000000000000000000000000000000000000000000000";
- int i;
- gsl_ieee_double_rep r;
-
- for (i = 0; i < 52; i++)
- {
- double x = d / pow (2.0, 1 + (double) i);
- mantissa[i] = '1';
- gsl_ieee_double_to_rep (&x, &r);
-
- gsl_test_int (r.sign, 0, "double x = DBL_MIN/2^%d, sign is +", i + 1);
- gsl_test_int (r.exponent, -1023,
- "double x = DBL_MIN/2^%d, exponent", i + 1);
- gsl_test_str (r.mantissa, mantissa,
- "double x = DBL_MIN/2^%d, mantissa", i + 1);
- gsl_test_int (r.type, GSL_IEEE_TYPE_DENORMAL,
- "double x = DBL_MIN/2^%d, type is DENORMAL", i + 1);
- mantissa[i] = '0';
- }
- }
- #endif
-
- /* Check for positive INFINITY (e.g. 2*DBL_MAX) */
-
- {
- double d = 1.7976931348623157e+308; /* DBL_MAX */
- const char mantissa[]
- = "0000000000000000000000000000000000000000000000000000";
- gsl_ieee_double_rep r;
-
- double x;
- x = 2.0 * d;
- gsl_ieee_double_to_rep (&x, &r);
-
- gsl_test_int (r.sign, 0, "double x = 2*DBL_MAX, sign is +");
- gsl_test_int (r.exponent, 1024, "double x = 2*DBL_MAX, exponent is 1024");
- gsl_test_str (r.mantissa, mantissa, "double x = 2*DBL_MAX, mantissa");
- gsl_test_int (r.type, GSL_IEEE_TYPE_INF, "double x = 2*DBL_MAX, type is INF");
- }
-
- /* Check for negative INFINITY (e.g. -2*DBL_MAX) */
-
- {
- double d = 1.7976931348623157e+308; /* DBL_MAX */
- const char mantissa[]
- = "0000000000000000000000000000000000000000000000000000";
- gsl_ieee_double_rep r;
-
- double x;
- x = -2.0 * d;
- gsl_ieee_double_to_rep (&x, &r);
-
- gsl_test_int (r.sign, 1, "double x = -2*DBL_MAX, sign is -");
- gsl_test_int (r.exponent, 1024, "double x = -2*DBL_MAX, exponent is 1024");
- gsl_test_str (r.mantissa, mantissa, "double x = -2*DBL_MAX, mantissa");
- gsl_test_int (r.type, GSL_IEEE_TYPE_INF,"double x = -2*DBL_MAX, type is INF");
- }
-
- /* Check for NAN (e.g. Inf - Inf) */
-
- {
- gsl_ieee_double_rep r;
- double x = 1.0, y = 2.0, z = zero;
-
- x = x / z;
- y = y / z;
- z = y - x;
-
- gsl_ieee_double_to_rep (&z, &r);
-
- /* We don't check the sign and we don't check the mantissa because
- they could be anything for a NaN */
-
- gsl_test_int (r.exponent, 1024, "double x = NaN, exponent is 1024");
- gsl_test_int (r.type, GSL_IEEE_TYPE_NAN, "double x = NaN, type is NAN");
- }
-
- exit (gsl_test_summary ());
- }
-