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/* -*- c++ -*- */
/*
* Copyright 2004 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* GNU Radio 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, or (at your option)
* any later version.
*
* GNU Radio 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 GNU Radio; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <qa_gr_fxpt.h>
#include <gr_fxpt.h>
#include <cppunit/TestAssert.h>
#include <iostream>
#include <stdio.h>
#include <unistd.h>
#include <math.h>
static const float SIN_COS_TOLERANCE = 1e-5;
void
qa_gr_fxpt::t0 ()
{
CPPUNIT_ASSERT_DOUBLES_EQUAL (M_PI/2, gr_fxpt::fixed_to_float (0x40000000), SIN_COS_TOLERANCE);
CPPUNIT_ASSERT_DOUBLES_EQUAL (0.0, gr_fxpt::fixed_to_float (0x00000000), SIN_COS_TOLERANCE);
CPPUNIT_ASSERT_DOUBLES_EQUAL (-M_PI, gr_fxpt::fixed_to_float (0x80000000), SIN_COS_TOLERANCE);
if (0){
/*
* These are disabled because of some precision issues.
*
* Different compilers seem to have different opinions on whether
* the calulations are done single or double (or extended)
* precision. Any of the answers are fine for our real purpose, but
* sometimes the answer is off by a few bits at the bottom.
* Hence, the disabled check.
*/
CPPUNIT_ASSERT_EQUAL ((gr_int32) 0x40000000, gr_fxpt::float_to_fixed (M_PI/2));
CPPUNIT_ASSERT_EQUAL ((gr_int32) 0, gr_fxpt::float_to_fixed (0));
CPPUNIT_ASSERT_EQUAL ((gr_int32) 0x80000000, gr_fxpt::float_to_fixed (-M_PI));
}
}
void
qa_gr_fxpt::t1 ()
{
CPPUNIT_ASSERT_DOUBLES_EQUAL ( 0, gr_fxpt::sin (0x00000000), SIN_COS_TOLERANCE);
CPPUNIT_ASSERT_DOUBLES_EQUAL ( 0.707106781, gr_fxpt::sin (0x20000000), SIN_COS_TOLERANCE);
CPPUNIT_ASSERT_DOUBLES_EQUAL ( 1, gr_fxpt::sin (0x40000000), SIN_COS_TOLERANCE);
CPPUNIT_ASSERT_DOUBLES_EQUAL ( 0.707106781, gr_fxpt::sin (0x60000000), SIN_COS_TOLERANCE);
CPPUNIT_ASSERT_DOUBLES_EQUAL ( 0, gr_fxpt::sin (0x7fffffff), SIN_COS_TOLERANCE);
CPPUNIT_ASSERT_DOUBLES_EQUAL ( 0, gr_fxpt::sin (0x80000000), SIN_COS_TOLERANCE);
CPPUNIT_ASSERT_DOUBLES_EQUAL ( 0, gr_fxpt::sin (0x80000001), SIN_COS_TOLERANCE);
CPPUNIT_ASSERT_DOUBLES_EQUAL (-1, gr_fxpt::sin (-0x40000000), SIN_COS_TOLERANCE);
CPPUNIT_ASSERT_DOUBLES_EQUAL (-0.707106781, gr_fxpt::sin (-0x20000000), SIN_COS_TOLERANCE);
for (float p = -M_PI; p < M_PI; p += 2 * M_PI / 3600){
float expected = sin (p);
float actual = gr_fxpt::sin (gr_fxpt::float_to_fixed (p));
CPPUNIT_ASSERT_DOUBLES_EQUAL (expected, actual, SIN_COS_TOLERANCE);
}
}
void
qa_gr_fxpt::t2 ()
{
for (float p = -M_PI; p < M_PI; p += 2 * M_PI / 3600){
float expected = cos (p);
float actual = gr_fxpt::cos (gr_fxpt::float_to_fixed (p));
CPPUNIT_ASSERT_DOUBLES_EQUAL (expected, actual, SIN_COS_TOLERANCE);
}
}
void
qa_gr_fxpt::t3 ()
{
for (float p = -M_PI; p < M_PI; p += 2 * M_PI / 3600){
float expected_sin = sin (p);
float expected_cos = cos (p);
float actual_sin;
float actual_cos;
gr_fxpt::sincos (gr_fxpt::float_to_fixed (p), &actual_sin, &actual_cos);
CPPUNIT_ASSERT_DOUBLES_EQUAL (expected_sin, actual_sin, SIN_COS_TOLERANCE);
CPPUNIT_ASSERT_DOUBLES_EQUAL (expected_cos, actual_cos, SIN_COS_TOLERANCE);
}
}
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