expf_test.cpp
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//===-- Unittests for expf ------------------------------------------------===//
//
// 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/expf.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>;
namespace mpfr = __llvm_libc::testing::mpfr;
TEST(ExpfTest, SpecialNumbers) {
llvmlibc_errno = 0;
EXPECT_TRUE(
isQuietNaN(__llvm_libc::expf(valueFromBits(BitPatterns::aQuietNaN))));
EXPECT_EQ(llvmlibc_errno, 0);
EXPECT_TRUE(isNegativeQuietNaN(
__llvm_libc::expf(valueFromBits(BitPatterns::aNegativeQuietNaN))));
EXPECT_EQ(llvmlibc_errno, 0);
EXPECT_TRUE(isQuietNaN(
__llvm_libc::expf(valueFromBits(BitPatterns::aSignallingNaN))));
EXPECT_EQ(llvmlibc_errno, 0);
EXPECT_TRUE(isNegativeQuietNaN(
__llvm_libc::expf(valueFromBits(BitPatterns::aNegativeSignallingNaN))));
EXPECT_EQ(llvmlibc_errno, 0);
EXPECT_EQ(BitPatterns::inf,
valueAsBits(__llvm_libc::expf(valueFromBits(BitPatterns::inf))));
EXPECT_EQ(llvmlibc_errno, 0);
EXPECT_EQ(BitPatterns::zero,
valueAsBits(__llvm_libc::expf(valueFromBits(BitPatterns::negInf))));
EXPECT_EQ(llvmlibc_errno, 0);
EXPECT_EQ(BitPatterns::one,
valueAsBits(__llvm_libc::expf(valueFromBits(BitPatterns::zero))));
EXPECT_EQ(llvmlibc_errno, 0);
EXPECT_EQ(BitPatterns::one, valueAsBits(__llvm_libc::expf(
valueFromBits(BitPatterns::negZero))));
EXPECT_EQ(llvmlibc_errno, 0);
}
TEST(ExpfTest, Overflow) {
llvmlibc_errno = 0;
EXPECT_EQ(BitPatterns::inf,
valueAsBits(__llvm_libc::expf(valueFromBits(0x7f7fffffU))));
EXPECT_EQ(llvmlibc_errno, ERANGE);
llvmlibc_errno = 0;
EXPECT_EQ(BitPatterns::inf,
valueAsBits(__llvm_libc::expf(valueFromBits(0x42cffff8U))));
EXPECT_EQ(llvmlibc_errno, ERANGE);
llvmlibc_errno = 0;
EXPECT_EQ(BitPatterns::inf,
valueAsBits(__llvm_libc::expf(valueFromBits(0x42d00008U))));
EXPECT_EQ(llvmlibc_errno, ERANGE);
}
TEST(ExpfTest, Underflow) {
llvmlibc_errno = 0;
EXPECT_EQ(BitPatterns::zero,
valueAsBits(__llvm_libc::expf(valueFromBits(0xff7fffffU))));
EXPECT_EQ(llvmlibc_errno, ERANGE);
llvmlibc_errno = 0;
EXPECT_EQ(BitPatterns::zero,
valueAsBits(__llvm_libc::expf(valueFromBits(0xc2cffff8U))));
EXPECT_EQ(llvmlibc_errno, ERANGE);
llvmlibc_errno = 0;
EXPECT_EQ(BitPatterns::zero,
valueAsBits(__llvm_libc::expf(valueFromBits(0xc2d00008U))));
EXPECT_EQ(llvmlibc_errno, ERANGE);
}
// Test with inputs which are the borders of underflow/overflow but still
// produce valid results without setting errno.
TEST(ExpfTest, Borderline) {
float x;
llvmlibc_errno = 0;
x = valueFromBits(0x42affff8U);
ASSERT_MPFR_MATCH(mpfr::Operation::Exp, x, __llvm_libc::expf(x), 1.0);
EXPECT_EQ(llvmlibc_errno, 0);
x = valueFromBits(0x42b00008U);
ASSERT_MPFR_MATCH(mpfr::Operation::Exp, x, __llvm_libc::expf(x), 1.0);
EXPECT_EQ(llvmlibc_errno, 0);
x = valueFromBits(0xc2affff8U);
ASSERT_MPFR_MATCH(mpfr::Operation::Exp, x, __llvm_libc::expf(x), 1.0);
EXPECT_EQ(llvmlibc_errno, 0);
x = valueFromBits(0xc2b00008U);
ASSERT_MPFR_MATCH(mpfr::Operation::Exp, x, __llvm_libc::expf(x), 1.0);
EXPECT_EQ(llvmlibc_errno, 0);
}
TEST(ExpfTest, 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;
llvmlibc_errno = 0;
float result = __llvm_libc::expf(x);
// If the computation resulted in an error or did not produce valid result
// in the single-precision floating point range, then ignore comparing with
// MPFR result as MPFR can still produce valid results because of its
// wider precision.
if (isnan(result) || isinf(result) || llvmlibc_errno != 0)
continue;
ASSERT_MPFR_MATCH(mpfr::Operation::Exp, x, __llvm_libc::expf(x), 1.0);
}
}