cosf_test.cpp
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//===-- Unittests for cosf ------------------------------------------------===//
//
// 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/errno.h"
#include "include/math.h"
#include "src/errno/llvmlibc_errno.h"
#include "src/math/cosf.h"
#include "test/src/math/sdcomp26094.h"
#include "utils/CPP/Array.h"
#include "utils/FPUtil/BitPatterns.h"
#include "utils/FPUtil/ClassificationFunctions.h"
#include "utils/FPUtil/FloatOperations.h"
#include "utils/FPUtil/FloatProperties.h"
#include "utils/MPFRWrapper/MPFRUtils.h"
#include "utils/UnitTest/Test.h"
#include <stdint.h>
using __llvm_libc::fputil::isNegativeQuietNaN;
using __llvm_libc::fputil::isQuietNaN;
using __llvm_libc::fputil::valueAsBits;
using __llvm_libc::fputil::valueFromBits;
using BitPatterns = __llvm_libc::fputil::BitPatterns<float>;
using __llvm_libc::testing::sdcomp26094Values;
namespace mpfr = __llvm_libc::testing::mpfr;
TEST(CosfTest, SpecialNumbers) {
llvmlibc_errno = 0;
EXPECT_TRUE(
isQuietNaN(__llvm_libc::cosf(valueFromBits(BitPatterns::aQuietNaN))));
EXPECT_EQ(llvmlibc_errno, 0);
EXPECT_TRUE(isNegativeQuietNaN(
__llvm_libc::cosf(valueFromBits(BitPatterns::aNegativeQuietNaN))));
EXPECT_EQ(llvmlibc_errno, 0);
EXPECT_TRUE(isQuietNaN(
__llvm_libc::cosf(valueFromBits(BitPatterns::aSignallingNaN))));
EXPECT_EQ(llvmlibc_errno, 0);
EXPECT_TRUE(isNegativeQuietNaN(
__llvm_libc::cosf(valueFromBits(BitPatterns::aNegativeSignallingNaN))));
EXPECT_EQ(llvmlibc_errno, 0);
EXPECT_EQ(BitPatterns::one,
valueAsBits(__llvm_libc::cosf(valueFromBits(BitPatterns::zero))));
EXPECT_EQ(llvmlibc_errno, 0);
EXPECT_EQ(BitPatterns::one, valueAsBits(__llvm_libc::cosf(
valueFromBits(BitPatterns::negZero))));
EXPECT_EQ(llvmlibc_errno, 0);
llvmlibc_errno = 0;
EXPECT_TRUE(isQuietNaN(__llvm_libc::cosf(valueFromBits(BitPatterns::inf))));
EXPECT_EQ(llvmlibc_errno, EDOM);
llvmlibc_errno = 0;
EXPECT_TRUE(
isQuietNaN(__llvm_libc::cosf(valueFromBits(BitPatterns::negInf))));
EXPECT_EQ(llvmlibc_errno, EDOM);
}
TEST(CosfTest, InFloatRange) {
constexpr uint32_t count = 1000000;
constexpr uint32_t step = UINT32_MAX / count;
for (uint32_t i = 0, v = 0; i <= count; ++i, v += step) {
float x = valueFromBits(v);
if (isnan(x) || isinf(x))
continue;
ASSERT_MPFR_MATCH(mpfr::Operation::Cos, x, __llvm_libc::cosf(x), 1.0);
}
}
// For small values, cos(x) is 1.
TEST(CosfTest, SmallValues) {
float x = valueFromBits(0x17800000U);
float result = __llvm_libc::cosf(x);
EXPECT_MPFR_MATCH(mpfr::Operation::Cos, x, result, 1.0);
EXPECT_EQ(BitPatterns::one, valueAsBits(result));
x = valueFromBits(0x0040000U);
result = __llvm_libc::cosf(x);
EXPECT_MPFR_MATCH(mpfr::Operation::Cos, x, result, 1.0);
EXPECT_EQ(BitPatterns::one, valueAsBits(result));
}
// SDCOMP-26094: check cosf in the cases for which the range reducer
// returns values furthest beyond its nominal upper bound of pi/4.
TEST(CosfTest, SDCOMP_26094) {
for (uint32_t v : sdcomp26094Values) {
float x = valueFromBits(v);
ASSERT_MPFR_MATCH(mpfr::Operation::Cos, x, __llvm_libc::cosf(x), 1.0);
}
}