libc/test/src/math/exhaustive/tanhf_test.cpp

   1 //===-- Exhaustive test for tanhf -----------------------------------------===//
   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 "exhaustive_test.h"
  10 #include "src/__support/FPUtil/FPBits.h"
  11 #include "src/math/tanhf.h"
  12 #include "utils/MPFRWrapper/MPFRUtils.h"
  13
  14 #include <thread>
  15
  16 using FPBits = __llvm_libc::fputil::FPBits<float>;
  17
  18 namespace mpfr = __llvm_libc::testing::mpfr;
  19
  20 struct LlvmLibcTanhfExhaustiveTest : public LlvmLibcExhaustiveTest<uint32_t> {
  21   bool check(uint32_t start, uint32_t stop,
  22              mpfr::RoundingMode rounding) override {
  23     mpfr::ForceRoundingMode r(rounding);
  24     uint32_t bits = start;
  25     bool result = true;
  26     do {
  27       FPBits xbits(bits);
  28       float x = float(xbits);
  29       result &= EXPECT_MPFR_MATCH(mpfr::Operation::Tanh, x,
  30                                   __llvm_libc::tanhf(x), 0.5, rounding);
  31     } while (bits++ < stop);
  32     return result;
  33   }
  34 };
  35
  36 static const int NUM_THREADS = std::thread::hardware_concurrency();
  37
  38 // Range: [0, INF];
  39 static const uint32_t POS_START = 0x0000'0000U;
  40 static const uint32_t POS_STOP = FPBits::inf(false).uintval();
  41
  42 TEST_F(LlvmLibcTanhfExhaustiveTest, PostiveRangeRoundNearestTieToEven) {
  43   test_full_range(POS_START, POS_STOP, mpfr::RoundingMode::Nearest);
  44 }
  45
  46 TEST_F(LlvmLibcTanhfExhaustiveTest, PostiveRangeRoundUp) {
  47   test_full_range(POS_START, POS_STOP, mpfr::RoundingMode::Upward);
  48 }
  49
  50 TEST_F(LlvmLibcTanhfExhaustiveTest, PostiveRangeRoundDown) {
  51   test_full_range(POS_START, POS_STOP, mpfr::RoundingMode::Downward);
  52 }
  53
  54 TEST_F(LlvmLibcTanhfExhaustiveTest, PostiveRangeRoundTowardZero) {
  55   test_full_range(POS_START, POS_STOP, mpfr::RoundingMode::TowardZero);
  56 }
  57
  58 // Range: [-INF, 0];
  59 static const uint32_t NEG_START = 0x8000'0000U;
  60 static const uint32_t NEG_STOP = FPBits::inf(true).uintval();
  61
  62 TEST_F(LlvmLibcTanhfExhaustiveTest, NegativeRangeRoundNearestTieToEven) {
  63   test_full_range(NEG_START, NEG_STOP, mpfr::RoundingMode::Nearest);
  64 }
  65
  66 TEST_F(LlvmLibcTanhfExhaustiveTest, NegativeRangeRoundUp) {
  67   test_full_range(NEG_START, NEG_STOP, mpfr::RoundingMode::Upward);
  68 }
  69
  70 TEST_F(LlvmLibcTanhfExhaustiveTest, NegativeRangeRoundDown) {
  71   test_full_range(NEG_START, NEG_STOP, mpfr::RoundingMode::Downward);
  72 }
  73
  74 TEST_F(LlvmLibcTanhfExhaustiveTest, NegativeRangeRoundTowardZero) {
  75   test_full_range(NEG_START, NEG_STOP, mpfr::RoundingMode::TowardZero);
  76 }