libc/test/src/math/exhaustive/log2f_test.cpp

   1 //===-- Exhaustive test for log2f -----------------------------------------===//
   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/log2f.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 LlvmLibcLog2fExhaustiveTest : 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::Log2, x,
  29                                   __llvm_libc::log2f(x), 0.5, rounding);
  30     } while (bits++ < stop);
  31     return result;
  32   }
  33 };
  34
  35 TEST_F(LlvmLibcLog2fExhaustiveTest, RoundNearestTieToEven) {
  36   test_full_range(/*start=*/0U, /*stop=*/0x7f80'0000U,
  37                   mpfr::RoundingMode::Nearest);
  38 }
  39
  40 TEST_F(LlvmLibcLog2fExhaustiveTest, RoundUp) {
  41   test_full_range(/*start=*/0U, /*stop=*/0x7f80'0000U,
  42                   mpfr::RoundingMode::Upward);
  43 }
  44
  45 TEST_F(LlvmLibcLog2fExhaustiveTest, RoundDown) {
  46   test_full_range(/*start=*/0U, /*stop=*/0x7f80'0000U,
  47                   mpfr::RoundingMode::Downward);
  48 }
  49
  50 TEST_F(LlvmLibcLog2fExhaustiveTest, RoundTowardZero) {
  51   test_full_range(/*start=*/0U, /*stop=*/0x7f80'0000U,
  52                   mpfr::RoundingMode::TowardZero);
  53 }