| //===-- 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 "hdr/math_macros.h" |
| #include "src/__support/FPUtil/FPBits.h" |
| #include "src/errno/libc_errno.h" |
| #include "src/math/expf.h" |
| #include "test/UnitTest/FPMatcher.h" |
| #include "test/UnitTest/Test.h" |
| #include "utils/MPFRWrapper/MPFRUtils.h" |
| |
| #include <stdint.h> |
| |
| using LlvmLibcExpfTest = LIBC_NAMESPACE::testing::FPTest<float>; |
| |
| namespace mpfr = LIBC_NAMESPACE::testing::mpfr; |
| |
| TEST_F(LlvmLibcExpfTest, SpecialNumbers) { |
| LIBC_NAMESPACE::libc_errno = 0; |
| |
| EXPECT_FP_EQ(aNaN, LIBC_NAMESPACE::expf(aNaN)); |
| EXPECT_MATH_ERRNO(0); |
| |
| EXPECT_FP_EQ(inf, LIBC_NAMESPACE::expf(inf)); |
| EXPECT_MATH_ERRNO(0); |
| |
| EXPECT_FP_EQ(0.0f, LIBC_NAMESPACE::expf(neg_inf)); |
| EXPECT_MATH_ERRNO(0); |
| |
| EXPECT_FP_EQ(1.0f, LIBC_NAMESPACE::expf(0.0f)); |
| EXPECT_MATH_ERRNO(0); |
| |
| EXPECT_FP_EQ(1.0f, LIBC_NAMESPACE::expf(-0.0f)); |
| EXPECT_MATH_ERRNO(0); |
| } |
| |
| TEST_F(LlvmLibcExpfTest, Overflow) { |
| LIBC_NAMESPACE::libc_errno = 0; |
| EXPECT_FP_EQ_WITH_EXCEPTION( |
| inf, LIBC_NAMESPACE::expf(FPBits(0x7f7fffffU).get_val()), FE_OVERFLOW); |
| EXPECT_MATH_ERRNO(ERANGE); |
| |
| EXPECT_FP_EQ_WITH_EXCEPTION( |
| inf, LIBC_NAMESPACE::expf(FPBits(0x42cffff8U).get_val()), FE_OVERFLOW); |
| EXPECT_MATH_ERRNO(ERANGE); |
| |
| EXPECT_FP_EQ_WITH_EXCEPTION( |
| inf, LIBC_NAMESPACE::expf(FPBits(0x42d00008U).get_val()), FE_OVERFLOW); |
| EXPECT_MATH_ERRNO(ERANGE); |
| } |
| |
| TEST_F(LlvmLibcExpfTest, Underflow) { |
| LIBC_NAMESPACE::libc_errno = 0; |
| EXPECT_FP_EQ_WITH_EXCEPTION( |
| 0.0f, LIBC_NAMESPACE::expf(FPBits(0xff7fffffU).get_val()), FE_UNDERFLOW); |
| EXPECT_MATH_ERRNO(ERANGE); |
| |
| float x = FPBits(0xc2cffff8U).get_val(); |
| EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Exp, x, |
| LIBC_NAMESPACE::expf(x), 0.5); |
| EXPECT_MATH_ERRNO(ERANGE); |
| |
| x = FPBits(0xc2d00008U).get_val(); |
| EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Exp, x, |
| LIBC_NAMESPACE::expf(x), 0.5); |
| EXPECT_MATH_ERRNO(ERANGE); |
| } |
| |
| // Test with inputs which are the borders of underflow/overflow but still |
| // produce valid results without setting errno. |
| TEST_F(LlvmLibcExpfTest, Borderline) { |
| float x; |
| |
| LIBC_NAMESPACE::libc_errno = 0; |
| x = FPBits(0x42affff8U).get_val(); |
| ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Exp, x, |
| LIBC_NAMESPACE::expf(x), 0.5); |
| EXPECT_MATH_ERRNO(0); |
| |
| x = FPBits(0x42b00008U).get_val(); |
| ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Exp, x, |
| LIBC_NAMESPACE::expf(x), 0.5); |
| EXPECT_MATH_ERRNO(0); |
| |
| x = FPBits(0xc2affff8U).get_val(); |
| ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Exp, x, |
| LIBC_NAMESPACE::expf(x), 0.5); |
| EXPECT_MATH_ERRNO(0); |
| |
| x = FPBits(0xc2b00008U).get_val(); |
| ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Exp, x, |
| LIBC_NAMESPACE::expf(x), 0.5); |
| EXPECT_MATH_ERRNO(0); |
| |
| x = FPBits(0xc236bd8cU).get_val(); |
| EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Exp, x, |
| LIBC_NAMESPACE::expf(x), 0.5); |
| EXPECT_MATH_ERRNO(0); |
| } |
| |
| TEST_F(LlvmLibcExpfTest, 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 (isnan(x) || isinf(x)) |
| continue; |
| LIBC_NAMESPACE::libc_errno = 0; |
| float result = LIBC_NAMESPACE::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) || LIBC_NAMESPACE::libc_errno != 0) |
| continue; |
| EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Exp, x, |
| LIBC_NAMESPACE::expf(x), 0.5); |
| } |
| } |