| //===-- 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/macros/properties/cpu_features.h" // LIBC_TARGET_CPU_HAS_FMA |
| #include "src/errno/libc_errno.h" |
| #include "src/math/exp2f.h" |
| #include "test/UnitTest/FPMatcher.h" |
| #include "test/UnitTest/Test.h" |
| #include "utils/MPFRWrapper/MPFRUtils.h" |
| |
| #include <stdint.h> |
| |
| using LlvmLibcExp2fTest = LIBC_NAMESPACE::testing::FPTest<float>; |
| |
| namespace mpfr = LIBC_NAMESPACE::testing::mpfr; |
| |
| TEST_F(LlvmLibcExp2fTest, SpecialNumbers) { |
| LIBC_NAMESPACE::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_NAMESPACE::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_NAMESPACE::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_NAMESPACE::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 (isnan(x) || isinf(x)) |
| continue; |
| LIBC_NAMESPACE::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 (isnan(result) || isinf(result) || LIBC_NAMESPACE::libc_errno != 0) |
| continue; |
| ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Exp2, x, |
| LIBC_NAMESPACE::exp2f(x), 0.5); |
| } |
| } |