libc/test/src/math/exhaustive/log1pf_test.cpp

   1 //===-- Exhaustive test for log1pf ----------------------------------------===//
   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/log1pf.h"
  12 #include "test/UnitTest/FPMatcher.h"
  13 #include "utils/MPFRWrapper/MPFRUtils.h"
  14
  15 using FPBits = __llvm_libc::fputil::FPBits<float>;
  16
  17 namespace mpfr = __llvm_libc::testing::mpfr;
  18
  19 struct LlvmLibcLog1pfExhaustiveTest : public LlvmLibcExhaustiveTest<uint32_t> {
  20   bool check(uint32_t start, uint32_t stop,
  21              mpfr::RoundingMode rounding) override {
  22     mpfr::ForceRoundingMode r(rounding);
  23     uint32_t bits = start;
  24     bool result = true;
  25     do {
  26       FPBits xbits(bits);
  27       float x = float(xbits);
  28       result &= EXPECT_MPFR_MATCH(mpfr::Operation::Log1p, x,
  29                                   __llvm_libc::log1pf(x), 0.5, rounding);
  30     } while (bits++ < stop);
  31     return result;
  32   }
  33 };
  34
  35 // Range: All non-negative;
  36 static constexpr uint32_t START = 0x0000'0000U;
  37 static constexpr uint32_t STOP = 0x7f80'0000U;
  38
  39 TEST_F(LlvmLibcLog1pfExhaustiveTest, RoundNearestTieToEven) {
  40   test_full_range(START, STOP, mpfr::RoundingMode::Nearest);
  41 }
  42
  43 TEST_F(LlvmLibcLog1pfExhaustiveTest, RoundUp) {
  44   test_full_range(START, STOP, mpfr::RoundingMode::Upward);
  45 }
  46
  47 TEST_F(LlvmLibcLog1pfExhaustiveTest, RoundDown) {
  48   test_full_range(START, STOP, mpfr::RoundingMode::Downward);
  49 }
  50
  51 TEST_F(LlvmLibcLog1pfExhaustiveTest, RoundTowardZero) {
  52   test_full_range(START, STOP, mpfr::RoundingMode::TowardZero);
  53 }
  54
  55 // Range: [-1, 0];
  56 static constexpr uint32_t NEG_START = 0x8000'0000U;
  57 static constexpr uint32_t NEG_STOP = 0xbf7f'ffffU;
  58
  59 TEST_F(LlvmLibcLog1pfExhaustiveTest, NegativeRoundNearestTieToEven) {
  60   test_full_range(NEG_START, NEG_STOP, mpfr::RoundingMode::Nearest);
  61 }
  62
  63 TEST_F(LlvmLibcLog1pfExhaustiveTest, NegativeRoundUp) {
  64   test_full_range(NEG_START, NEG_STOP, mpfr::RoundingMode::Upward);
  65 }
  66
  67 TEST_F(LlvmLibcLog1pfExhaustiveTest, NegativeRoundDown) {
  68   test_full_range(NEG_START, NEG_STOP, mpfr::RoundingMode::Downward);
  69 }
  70
  71 TEST_F(LlvmLibcLog1pfExhaustiveTest, NegativeRoundTowardZero) {
  72   test_full_range(NEG_START, NEG_STOP, mpfr::RoundingMode::TowardZero);
  73 }