67 lines · cpp
1//===-- Unittests for log2f -----------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9#include "hdr/math_macros.h"10#include "src/__support/FPUtil/FPBits.h"11#include "src/__support/libc_errno.h"12#include "src/math/log2f.h"13#include "test/UnitTest/FPMatcher.h"14#include "test/UnitTest/Test.h"15#include "utils/MPFRWrapper/MPFRUtils.h"16 17#include "hdr/stdint_proxy.h"18 19using LlvmLibcLog2fTest = LIBC_NAMESPACE::testing::FPTest<float>;20 21namespace mpfr = LIBC_NAMESPACE::testing::mpfr;22 23TEST_F(LlvmLibcLog2fTest, SpecialNumbers) {24 EXPECT_FP_EQ(aNaN, LIBC_NAMESPACE::log2f(aNaN));25 EXPECT_FP_EQ(inf, LIBC_NAMESPACE::log2f(inf));26 EXPECT_FP_IS_NAN_WITH_EXCEPTION(LIBC_NAMESPACE::log2f(neg_inf), FE_INVALID);27 EXPECT_FP_EQ_WITH_EXCEPTION(neg_inf, LIBC_NAMESPACE::log2f(0.0f),28 FE_DIVBYZERO);29 EXPECT_FP_EQ_WITH_EXCEPTION(neg_inf, LIBC_NAMESPACE::log2f(-0.0f),30 FE_DIVBYZERO);31 EXPECT_FP_IS_NAN_WITH_EXCEPTION(LIBC_NAMESPACE::log2f(-1.0f), FE_INVALID);32 EXPECT_FP_EQ_ALL_ROUNDING(zero, LIBC_NAMESPACE::log2f(1.0f));33}34 35TEST_F(LlvmLibcLog2fTest, TrickyInputs) {36 constexpr int N = 10;37 constexpr uint32_t INPUTS[N] = {38 0x3f7d57f5U, 0x3f7e3274U, 0x3f7ed848U, 0x3f7fd6ccU, 0x3f7fffffU,39 0x3f80079bU, 0x3f81d0b5U, 0x3f82e602U, 0x3f83c98dU, 0x3f8cba39U};40 41 for (int i = 0; i < N; ++i) {42 float x = FPBits(INPUTS[i]).get_val();43 EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Log2, x,44 LIBC_NAMESPACE::log2f(x), 0.5);45 }46}47 48TEST_F(LlvmLibcLog2fTest, InFloatRange) {49 constexpr uint32_t COUNT = 100'000;50 constexpr uint32_t STEP = UINT32_MAX / COUNT;51 for (uint32_t i = 0, v = 0; i <= COUNT; ++i, v += STEP) {52 float x = FPBits(v).get_val();53 if (FPBits(v).is_nan() || FPBits(v).is_inf())54 continue;55 libc_errno = 0;56 float result = LIBC_NAMESPACE::log2f(x);57 // If the computation resulted in an error or did not produce valid result58 // in the single-precision floating point range, then ignore comparing with59 // MPFR result as MPFR can still produce valid results because of its60 // wider precision.61 if (FPBits(result).is_nan() || FPBits(result).is_inf() || libc_errno != 0)62 continue;63 ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Log2, x,64 LIBC_NAMESPACE::log2f(x), 0.5);65 }66}67