53 lines
1.5 KiB
C++
53 lines
1.5 KiB
C++
// SPDX-License-Identifier: BSD-2-Clause
|
|
|
|
// This code is part of the sfizz library and is licensed under a BSD 2-clause
|
|
// license. You should have receive a LICENSE.md file along with the code.
|
|
// If not, contact the sfizz maintainers at https://github.com/sfztools/sfizz
|
|
|
|
#include "catch2/catch.hpp"
|
|
#include "sfizz/MathHelpers.h"
|
|
#include <cmath>
|
|
|
|
TEST_CASE("[FloatMath] Fast ilog2 (float)")
|
|
{
|
|
for (float x = -100.0f; x < +100.0f; x += 0.01f) {
|
|
int ex1 = fp_exponent(x);
|
|
int ex2 = static_cast<int>(std::floor(std::log2(std::fabs(x))));
|
|
REQUIRE(ex1 == ex2);
|
|
}
|
|
}
|
|
|
|
TEST_CASE("[FloatMath] Fast ilog2 (double)")
|
|
{
|
|
for (double x = -100.0; x < +100.0; x += 0.01) {
|
|
int ex1 = fp_exponent(x);
|
|
int ex2 = static_cast<int>(std::floor(std::log2(std::fabs(x))));
|
|
REQUIRE(ex1 == ex2);
|
|
}
|
|
}
|
|
|
|
TEST_CASE("[FloatMath] Break apart and reconstruct (float)")
|
|
{
|
|
for (int p = 0; p < 128; ++p) {
|
|
float f = 440.0 * std::pow(2.0, (p - 69.0) / 12.0);
|
|
|
|
bool sgn = fp_sign(f);
|
|
int ex = fp_exponent(f);
|
|
Fraction<uint64_t> mant = fp_mantissa(f);
|
|
|
|
REQUIRE(fp_from_parts<float>(sgn, ex, mant.num) == f);
|
|
}
|
|
}
|
|
|
|
TEST_CASE("[FloatMath] Break apart and reconstruct (double)")
|
|
{
|
|
for (int p = 0; p < 128; ++p) {
|
|
double f = 440.0 * std::pow(2.0, (p - 69.0) / 12.0);
|
|
|
|
bool sgn = fp_sign(f);
|
|
int ex = fp_exponent(f);
|
|
Fraction<uint64_t> mant = fp_mantissa(f);
|
|
|
|
REQUIRE(fp_from_parts<double>(sgn, ex, mant.num) == f);
|
|
}
|
|
}
|