| //===-- 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; |
| |
| DECLARE_SPECIAL_CONSTANTS(double) |
| |
| 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); |
| } |
| } |