sqrt_test.cpp
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//===-- Unittests for sqrt -----------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===---------------------------------------------------------------------===//
#include "include/math.h"
#include "src/math/sqrt.h"
#include "utils/FPUtil/FPBits.h"
#include "utils/FPUtil/TestHelpers.h"
#include "utils/MPFRWrapper/MPFRUtils.h"
using FPBits = __llvm_libc::fputil::FPBits<double>;
using UIntType = typename FPBits::UIntType;
namespace mpfr = __llvm_libc::testing::mpfr;
constexpr UIntType HiddenBit =
UIntType(1) << __llvm_libc::fputil::MantissaWidth<double>::value;
double nan = FPBits::buildNaN(1);
double inf = FPBits::inf();
double negInf = FPBits::negInf();
TEST(SqrtTest, SpecialValues) {
ASSERT_FP_EQ(nan, __llvm_libc::sqrt(nan));
ASSERT_FP_EQ(inf, __llvm_libc::sqrt(inf));
ASSERT_FP_EQ(nan, __llvm_libc::sqrt(negInf));
ASSERT_FP_EQ(0.0, __llvm_libc::sqrt(0.0));
ASSERT_FP_EQ(-0.0, __llvm_libc::sqrt(-0.0));
ASSERT_FP_EQ(nan, __llvm_libc::sqrt(-1.0));
ASSERT_FP_EQ(1.0, __llvm_libc::sqrt(1.0));
ASSERT_FP_EQ(2.0, __llvm_libc::sqrt(4.0));
ASSERT_FP_EQ(3.0, __llvm_libc::sqrt(9.0));
}
TEST(SqrtTest, DenormalValues) {
for (UIntType mant = 1; mant < HiddenBit; mant <<= 1) {
FPBits denormal(0.0);
denormal.mantissa = mant;
ASSERT_MPFR_MATCH(mpfr::Operation::Sqrt, double(denormal),
__llvm_libc::sqrt(denormal), 0.5);
}
constexpr UIntType count = 1'000'001;
constexpr UIntType step = HiddenBit / count;
for (UIntType i = 0, v = 0; i <= count; ++i, v += step) {
double x = *reinterpret_cast<double *>(&v);
ASSERT_MPFR_MATCH(mpfr::Operation::Sqrt, x, __llvm_libc::sqrt(x), 0.5);
}
}
TEST(SqrtTest, InDoubleRange) {
constexpr UIntType count = 10'000'001;
constexpr UIntType step = UIntType(-1) / count;
for (UIntType i = 0, v = 0; i <= count; ++i, v += step) {
double x = *reinterpret_cast<double *>(&v);
if (isnan(x) || (x < 0)) {
continue;
}
ASSERT_MPFR_MATCH(mpfr::Operation::Sqrt, x, __llvm_libc::sqrt(x), 0.5);
}
}