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//===-- Unittests for exp2f -----------------------------------------------===//
//
// 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 "hdr/math_macros.h"
#include "src/__support/FPUtil/FPBits.h"
#include "src/__support/libc_errno.h"
#include "src/math/exp2f.h"
#include "test/UnitTest/FPMatcher.h"
#include "test/UnitTest/Test.h"
#include "utils/MPFRWrapper/MPFRUtils.h"
#include "hdr/stdint_proxy.h"
using LlvmLibcExp2fTest = LIBC_NAMESPACE::testing::FPTest<float>;
namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
TEST_F(LlvmLibcExp2fTest, SpecialNumbers) {
libc_errno = 0;
EXPECT_FP_EQ(aNaN, LIBC_NAMESPACE::exp2f(aNaN));
EXPECT_MATH_ERRNO(0);
EXPECT_FP_EQ(inf, LIBC_NAMESPACE::exp2f(inf));
EXPECT_MATH_ERRNO(0);
EXPECT_FP_EQ(0.0f, LIBC_NAMESPACE::exp2f(neg_inf));
EXPECT_MATH_ERRNO(0);
EXPECT_FP_EQ(1.0f, LIBC_NAMESPACE::exp2f(0.0f));
EXPECT_MATH_ERRNO(0);
EXPECT_FP_EQ(1.0f, LIBC_NAMESPACE::exp2f(-0.0f));
EXPECT_MATH_ERRNO(0);
}
TEST_F(LlvmLibcExp2fTest, Overflow) {
libc_errno = 0;
EXPECT_FP_EQ_WITH_EXCEPTION(
inf, LIBC_NAMESPACE::exp2f(FPBits(0x7f7fffffU).get_val()), FE_OVERFLOW);
EXPECT_MATH_ERRNO(ERANGE);
EXPECT_FP_EQ_WITH_EXCEPTION(
inf, LIBC_NAMESPACE::exp2f(FPBits(0x43000000U).get_val()), FE_OVERFLOW);
EXPECT_MATH_ERRNO(ERANGE);
EXPECT_FP_EQ_WITH_EXCEPTION(
inf, LIBC_NAMESPACE::exp2f(FPBits(0x43000001U).get_val()), FE_OVERFLOW);
EXPECT_MATH_ERRNO(ERANGE);
}
TEST_F(LlvmLibcExp2fTest, TrickyInputs) {
constexpr int N = 12;
constexpr uint32_t INPUTS[N] = {
0x3b429d37U, /*0x1.853a6ep-9f*/
0x3c02a9adU, /*0x1.05535ap-7f*/
0x3ca66e26U, /*0x1.4cdc4cp-6f*/
0x3d92a282U, /*0x1.254504p-4f*/
0x42fa0001U, /*0x1.f40002p+6f*/
0x42ffffffU, /*0x1.fffffep+6f*/
0xb8d3d026U, /*-0x1.a7a04cp-14f*/
0xbcf3a937U, /*-0x1.e7526ep-6f*/
0xc2fa0001U, /*-0x1.f40002p+6f*/
0xc2fc0000U, /*-0x1.f8p+6f*/
0xc2fc0001U, /*-0x1.f80002p+6f*/
0xc3150000U, /*-0x1.2ap+7f*/
};
for (int i = 0; i < N; ++i) {
libc_errno = 0;
float x = FPBits(INPUTS[i]).get_val();
EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Exp2, x,
LIBC_NAMESPACE::exp2f(x), 0.5);
EXPECT_MATH_ERRNO(0);
}
}
TEST_F(LlvmLibcExp2fTest, Underflow) {
libc_errno = 0;
EXPECT_FP_EQ_WITH_EXCEPTION(
0.0f, LIBC_NAMESPACE::exp2f(FPBits(0xff7fffffU).get_val()), FE_UNDERFLOW);
EXPECT_MATH_ERRNO(ERANGE);
float x = FPBits(0xc3158000U).get_val();
EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Exp2, x,
LIBC_NAMESPACE::exp2f(x), 0.5);
EXPECT_MATH_ERRNO(0);
x = FPBits(0xc3160000U).get_val();
EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Exp2, x,
LIBC_NAMESPACE::exp2f(x), 0.5);
EXPECT_MATH_ERRNO(ERANGE);
x = FPBits(0xc3165432U).get_val();
EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Exp2, x,
LIBC_NAMESPACE::exp2f(x), 0.5);
EXPECT_MATH_ERRNO(ERANGE);
}
TEST_F(LlvmLibcExp2fTest, InFloatRange) {
constexpr uint32_t COUNT = 100'000;
constexpr uint32_t STEP = UINT32_MAX / COUNT;
for (uint32_t i = 0, v = 0; i <= COUNT; ++i, v += STEP) {
float x = FPBits(v).get_val();
if (FPBits(v).is_nan() || FPBits(v).is_inf())
continue;
libc_errno = 0;
float result = LIBC_NAMESPACE::exp2f(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 (FPBits(result).is_nan() || FPBits(result).is_inf() || libc_errno != 0)
continue;
ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Exp2, x,
LIBC_NAMESPACE::exp2f(x), 0.5);
}
}
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