blob: 523b1951ad117838fba8d4acaac6a42b09aa2398 [file] [log] [blame]
//===-- Unittests for expm1f-----------------------------------------------===//
//
// 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 "src/__support/FPUtil/FPBits.h"
#include "src/math/expm1f.h"
#include "utils/MPFRWrapper/MPFRUtils.h"
#include "utils/UnitTest/FPMatcher.h"
#include "utils/UnitTest/Test.h"
#include <math.h>
#include <errno.h>
#include <stdint.h>
namespace mpfr = __llvm_libc::testing::mpfr;
DECLARE_SPECIAL_CONSTANTS(float)
TEST(LlvmLibcExpm1fTest, SpecialNumbers) {
errno = 0;
EXPECT_FP_EQ(aNaN, __llvm_libc::expm1f(aNaN));
EXPECT_EQ(errno, 0);
EXPECT_FP_EQ(inf, __llvm_libc::expm1f(inf));
EXPECT_EQ(errno, 0);
EXPECT_FP_EQ(-1.0f, __llvm_libc::expm1f(negInf));
EXPECT_EQ(errno, 0);
EXPECT_FP_EQ(0.0f, __llvm_libc::expm1f(0.0f));
EXPECT_EQ(errno, 0);
EXPECT_FP_EQ(-0.0f, __llvm_libc::expm1f(-0.0f));
EXPECT_EQ(errno, 0);
}
TEST(LlvmLibcExpm1fTest, Overflow) {
errno = 0;
EXPECT_FP_EQ(inf, __llvm_libc::expm1f(float(FPBits(0x7f7fffffU))));
EXPECT_EQ(errno, ERANGE);
errno = 0;
EXPECT_FP_EQ(inf, __llvm_libc::expm1f(float(FPBits(0x42cffff8U))));
EXPECT_EQ(errno, ERANGE);
errno = 0;
EXPECT_FP_EQ(inf, __llvm_libc::expm1f(float(FPBits(0x42d00008U))));
EXPECT_EQ(errno, ERANGE);
}
TEST(LlvmLibcExpm1fTest, Underflow) {
errno = 0;
EXPECT_FP_EQ(-1.0f, __llvm_libc::expm1f(float(FPBits(0xff7fffffU))));
EXPECT_EQ(errno, ERANGE);
errno = 0;
float x = float(FPBits(0xc2cffff8U));
EXPECT_FP_EQ(-1.0f, __llvm_libc::expm1f(x));
EXPECT_EQ(errno, ERANGE);
errno = 0;
x = float(FPBits(0xc2d00008U));
EXPECT_FP_EQ(-1.0f, __llvm_libc::expm1f(x));
EXPECT_EQ(errno, ERANGE);
}
// Test with inputs which are the borders of underflow/overflow but still
// produce valid results without setting errno.
TEST(LlvmLibcExpm1fTest, Borderline) {
float x;
errno = 0;
x = float(FPBits(0x42affff8U));
ASSERT_MPFR_MATCH(mpfr::Operation::Expm1, x, __llvm_libc::expm1f(x), 1.0);
EXPECT_EQ(errno, 0);
x = float(FPBits(0x42b00008U));
ASSERT_MPFR_MATCH(mpfr::Operation::Expm1, x, __llvm_libc::expm1f(x), 1.0);
EXPECT_EQ(errno, 0);
x = float(FPBits(0xc2affff8U));
ASSERT_MPFR_MATCH(mpfr::Operation::Expm1, x, __llvm_libc::expm1f(x), 1.0);
EXPECT_EQ(errno, 0);
x = float(FPBits(0xc2b00008U));
ASSERT_MPFR_MATCH(mpfr::Operation::Expm1, x, __llvm_libc::expm1f(x), 1.0);
EXPECT_EQ(errno, 0);
}
TEST(LlvmLibcExpm1fTest, 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 = float(FPBits(v));
if (isnan(x) || isinf(x))
continue;
errno = 0;
float result = __llvm_libc::expm1f(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) || errno != 0)
continue;
ASSERT_MPFR_MATCH(mpfr::Operation::Expm1, x, __llvm_libc::expm1f(x), 1.5);
}
}