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

   1 //===-- Exhaustive test for expf ------------------------------------------===//
   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/expf.h"
  12 #include "test/UnitTest/FPMatcher.h"
  13 #include "utils/MPFRWrapper/MPFRUtils.h"
  14
  15 #include <thread>
  16
  17 using FPBits = __llvm_libc::fputil::FPBits<float>;
  18
  19 namespace mpfr = __llvm_libc::testing::mpfr;
  20
  21 struct LlvmLibcExpfExhaustiveTest : public LlvmLibcExhaustiveTest<uint32_t> {
  22   bool check(uint32_t start, uint32_t stop,
  23              mpfr::RoundingMode rounding) override {
  24     mpfr::ForceRoundingMode r(rounding);
  25     uint32_t bits = start;
  26     bool result = true;
  27     do {
  28       FPBits xbits(bits);
  29       float x = float(xbits);
  30       result &= TEST_MPFR_MATCH(mpfr::Operation::Exp, x, __llvm_libc::expf(x),
  31                                 0.5, rounding);
  32     } while (bits++ < stop);
  33     return result;
  34   }
  35 };
  36
  37 // Range: [0, 89];
  38 static constexpr uint32_t POS_START = 0x0000'0000U;
  39 static constexpr uint32_t POS_STOP = 0x42b2'0000U;
  40
  41 TEST_F(LlvmLibcExpfExhaustiveTest, PostiveRangeRoundNearestTieToEven) {
  42   test_full_range(POS_START, POS_STOP, mpfr::RoundingMode::Nearest);
  43 }
  44
  45 TEST_F(LlvmLibcExpfExhaustiveTest, PostiveRangeRoundUp) {
  46   test_full_range(POS_START, POS_STOP, mpfr::RoundingMode::Upward);
  47 }
  48
  49 TEST_F(LlvmLibcExpfExhaustiveTest, PostiveRangeRoundDown) {
  50   test_full_range(POS_START, POS_STOP, mpfr::RoundingMode::Downward);
  51 }
  52
  53 TEST_F(LlvmLibcExpfExhaustiveTest, PostiveRangeRoundTowardZero) {
  54   test_full_range(POS_START, POS_STOP, mpfr::RoundingMode::TowardZero);
  55 }
  56
  57 // Range: [-104, 0];
  58 static constexpr uint32_t NEG_START = 0x8000'0000U;
  59 static constexpr uint32_t NEG_STOP = 0xc2d0'0000U;
  60
  61 TEST_F(LlvmLibcExpfExhaustiveTest, NegativeRangeRoundNearestTieToEven) {
  62   test_full_range(NEG_START, NEG_STOP, mpfr::RoundingMode::Nearest);
  63 }
  64
  65 TEST_F(LlvmLibcExpfExhaustiveTest, NegativeRangeRoundUp) {
  66   test_full_range(NEG_START, NEG_STOP, mpfr::RoundingMode::Upward);
  67 }
  68
  69 TEST_F(LlvmLibcExpfExhaustiveTest, NegativeRangeRoundDown) {
  70   test_full_range(NEG_START, NEG_STOP, mpfr::RoundingMode::Downward);
  71 }
  72
  73 TEST_F(LlvmLibcExpfExhaustiveTest, NegativeRangeRoundTowardZero) {
  74   test_full_range(NEG_START, NEG_STOP, mpfr::RoundingMode::TowardZero);
  75 }