libc/test/src/math/log10f_test.cpp

   1 //===-- Unittests for log10f ----------------------------------------------===//
   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-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "src/__support/FPUtil/FPBits.h"
  10 #include "src/math/log10f.h"
  11 #include "test/UnitTest/FPMatcher.h"
  12 #include "test/UnitTest/Test.h"
  13 #include "utils/MPFRWrapper/MPFRUtils.h"
  14 #include <math.h>
  15
  16 #include <errno.h>
  17 #include <stdint.h>
  18
  19 using LlvmLibcLog10fTest = LIBC_NAMESPACE::testing::FPTest<float>;
  20
  21 namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
  22
  23 TEST_F(LlvmLibcLog10fTest, SpecialNumbers) {
  24   EXPECT_FP_EQ(aNaN, LIBC_NAMESPACE::log10f(aNaN));
  25   EXPECT_FP_EQ(inf, LIBC_NAMESPACE::log10f(inf));
  26   EXPECT_FP_IS_NAN_WITH_EXCEPTION(LIBC_NAMESPACE::log10f(neg_inf), FE_INVALID);
  27   EXPECT_FP_EQ_WITH_EXCEPTION(neg_inf, LIBC_NAMESPACE::log10f(0.0f),
  28                               FE_DIVBYZERO);
  29   EXPECT_FP_EQ_WITH_EXCEPTION(neg_inf, LIBC_NAMESPACE::log10f(-0.0f),
  30                               FE_DIVBYZERO);
  31   EXPECT_FP_IS_NAN_WITH_EXCEPTION(LIBC_NAMESPACE::log10f(-1.0f), FE_INVALID);
  32   EXPECT_FP_EQ_ALL_ROUNDING(zero, LIBC_NAMESPACE::log10f(1.0f));
  33 }
  34
  35 TEST_F(LlvmLibcLog10fTest, TrickyInputs) {
  36   constexpr int N = 21;
  37   constexpr uint32_t INPUTS[N] = {
  38       0x3f800000U /*1.0f*/,
  39       0x41200000U /*10.0f*/,
  40       0x42c80000U /*100.0f*/,
  41       0x447a0000U /*1,000.0f*/,
  42       0x461c4000U /*10,000.0f*/,
  43       0x47c35000U /*100,000.0f*/,
  44       0x49742400U /*1,000,000.0f*/,
  45       0x4b189680U /*10,000,000.0f*/,
  46       0x4cbebc20U /*100,000,000.0f*/,
  47       0x4e6e6b28U /*1,000,000,000.0f*/,
  48       0x501502f9U /*10,000,000,000.0f*/,
  49       0x4f134f83U /*2471461632.0f*/,
  50       0x7956ba5eU /*69683218960000541503257137270226944.0f*/,
  51       0x08ae'a356U /*0x1.5d46acp-110f*/,
  52       0x1c7d'a337U /*0x1.fb466ep-71f*/,
  53       0x69c8'c583U /*0x1.918b06p+84f*/,
  54       0x0efe'ee7aU /*0x1.fddcf4p-98f*/,
  55       0x3f5f'de1bU /*0x1.bfbc36p-1f*/,
  56       0x3f80'70d8U /*0x1.00e1bp0f*/,
  57       0x120b'93dcU /*0x1.1727b8p-91f*/,
  58       0x13ae'78d3U /*0x1.5cf1a6p-88f*/,
  59   };
  60
  61   for (int i = 0; i < N; ++i) {
  62     float x = float(FPBits(INPUTS[i]));
  63     EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Log10, x,
  64                                    LIBC_NAMESPACE::log10f(x), 0.5);
  65   }
  66 }
  67
  68 TEST_F(LlvmLibcLog10fTest, InFloatRange) {
  69   constexpr uint32_t COUNT = 100'000;
  70   constexpr uint32_t STEP = UINT32_MAX / COUNT;
  71   for (uint32_t i = 0, v = 0; i <= COUNT; ++i, v += STEP) {
  72     float x = float(FPBits(v));
  73     ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Log10, x,
  74                                    LIBC_NAMESPACE::log10f(x), 0.5);
  75   }
  76 }