libc/test/src/math/logf_test.cpp

   1 //===-- Unittests for logf-----------------------------------------------===//
   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/logf.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 <stdint.h>
  17
  18 namespace mpfr = __llvm_libc::testing::mpfr;
  19
  20 DECLARE_SPECIAL_CONSTANTS(float)
  21
  22 TEST(LlvmLibcLogfTest, SpecialNumbers) {
  23   EXPECT_FP_EQ(aNaN, __llvm_libc::logf(aNaN));
  24   EXPECT_FP_EQ(inf, __llvm_libc::logf(inf));
  25   EXPECT_FP_IS_NAN_WITH_EXCEPTION(__llvm_libc::logf(neg_inf), FE_INVALID);
  26   EXPECT_FP_EQ_WITH_EXCEPTION(neg_inf, __llvm_libc::logf(0.0f), FE_DIVBYZERO);
  27   EXPECT_FP_EQ_WITH_EXCEPTION(neg_inf, __llvm_libc::logf(-0.0f), FE_DIVBYZERO);
  28   EXPECT_FP_IS_NAN_WITH_EXCEPTION(__llvm_libc::logf(-1.0f), FE_INVALID);
  29   EXPECT_FP_EQ_ALL_ROUNDING(zero, __llvm_libc::logf(1.0f));
  30 }
  31
  32 TEST(LlvmLibcLogfTest, TrickyInputs) {
  33   constexpr int N = 35;
  34   constexpr uint32_t INPUTS[N] = {
  35       0x1b7679ffU, /*0x1.ecf3fep-73f*/
  36       0x1e88452dU, /*0x1.108a5ap-66f*/
  37       0x3f800001U, /*0x1.000002p+0f*/
  38       0x3509dcf6U, /*0x1.13b9ecp-21f*/
  39       0x3bf86ef0U, /*0x1.f0ddep-8f*/
  40       0x3c413d3aU, /*0x1.827a74p-7f*/
  41       0x3ca1c99fU, /*0x1.43933ep-6f*/
  42       0x3d13e105U, /*0x1.27c20ap-5f*/
  43       0x3f7ff1f2U, /*0x1.ffe3e4p-1f*/
  44       0x3f7fffffU, /*0x1.fffffep-1f*/
  45       0x3f800001U, /*0x1.000002p+0f*/
  46       0x3f800006U, /*0x1.00000cp+0f*/
  47       0x3f800014U, /*0x1.000028p+0f*/
  48       0x3f80001cU, /*0x1.000038p+0f*/
  49       0x3f80c777U, /*0x1.018eeep+0f*/
  50       0x3f80ce72U, /*0x1.019ce4p+0f*/
  51       0x3f80d19fU, /*0x1.01a33ep+0f*/
  52       0x3f80f7bfU, /*0x1.01ef7ep+0f*/
  53       0x3f80fcfeU, /*0x1.01f9fcp+0f*/
  54       0x3f81feb4U, /*0x1.03fd68p+0f*/
  55       0x3f83d731U, /*0x1.07ae62p+0f*/
  56       0x3f90cb1dU, /*0x1.21963ap+0f*/
  57       0x3fc55379U, /*0x1.8aa6f2p+0f*/
  58       0x3fd364d7U, /*0x1.a6c9aep+0f*/
  59       0x41178febU, /*0x1.2f1fd6p+3f*/
  60       0x4c5d65a5U, /*0x1.bacb4ap+25f*/
  61       0x4e85f412U, /*0x1.0be824p+30f*/
  62       0x500ffb03U, /*0x1.1ff606p+33f*/
  63       0x5cd69e88U, /*0x1.ad3d1p+58f*/
  64       0x5ee8984eU, /*0x1.d1309cp+62f*/
  65       0x65d890d3U, /*0x1.b121a6p+76f*/
  66       0x665e7ca6U, /*0x1.bcf94cp+77f*/
  67       0x6f31a8ecU, /*0x1.6351d8p+95f*/
  68       0x79e7ec37U, /*0x1.cfd86ep+116f*/
  69       0x7a17f30aU, /*0x1.2fe614p+117f*/
  70   };
  71   for (int i = 0; i < N; ++i) {
  72     float x = float(FPBits(INPUTS[i]));
  73     EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Log, x,
  74                                    __llvm_libc::logf(x), 0.5);
  75   }
  76 }
  77
  78 TEST(LlvmLibcLogfTest, InFloatRange) {
  79   constexpr uint32_t COUNT = 1000000;
  80   constexpr uint32_t STEP = UINT32_MAX / COUNT;
  81   for (uint32_t i = 0, v = 0; i <= COUNT; ++i, v += STEP) {
  82     float x = float(FPBits(v));
  83     if (isnan(x) || isinf(x))
  84       continue;
  85     ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Log, x,
  86                                    __llvm_libc::logf(x), 0.5);
  87   }
  88 }