test/src/math/acoshf_test.cpp

//===-- Unittests for acoshf ----------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#include "src/__support/FPUtil/FPBits.h"
#include "src/errno/libc_errno.h"
#include "src/math/acoshf.h"
#include "test/UnitTest/FPMatcher.h"
#include "test/UnitTest/Test.h"
#include "utils/MPFRWrapper/MPFRUtils.h"
#include <math.h>

#include <errno.h>
#include <stdint.h>

using FPBits_t = __llvm_libc::fputil::FPBits<float>;

namespace mpfr = __llvm_libc::testing::mpfr;

DECLARE_SPECIAL_CONSTANTS(float)

TEST(LlvmLibcAcoshfTest, SpecialNumbers) {
  libc_errno = 0;

  EXPECT_FP_EQ(aNaN, __llvm_libc::acoshf(aNaN));
  EXPECT_MATH_ERRNO(0);

  EXPECT_FP_EQ(aNaN, __llvm_libc::acoshf(0.0f));
  EXPECT_MATH_ERRNO(EDOM);

  EXPECT_FP_EQ(0.0f, __llvm_libc::acoshf(1.0f));
  EXPECT_MATH_ERRNO(0);

  EXPECT_FP_EQ(inf, __llvm_libc::acoshf(inf));
  EXPECT_MATH_ERRNO(0);

  EXPECT_FP_EQ(aNaN, __llvm_libc::acoshf(neg_inf));
  EXPECT_MATH_ERRNO(EDOM);
}

TEST(LlvmLibcAcoshfTest, InFloatRange) {
  constexpr uint32_t COUNT = 100'000;
  constexpr uint32_t STEP = UINT32_MAX / COUNT;
  for (uint32_t i = 0, v = 0; i <= COUNT; ++i, v += STEP) {
    float x = float(FPBits_t(v));
    if (isnan(x) || isinf(x))
      continue;
    ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Acosh, x,
                                   __llvm_libc::acoshf(x), 0.5);
  }
}

TEST(LlvmLibcAcoshfTest, SpecificBitPatterns) {
  constexpr int N = 12;
  constexpr uint32_t INPUTS[N] = {
      0x3f800000, // x = 1.0f
      0x45abaf26, // x = 0x1.575e4cp12f
      0x49d29048, // x = 0x1.a5209p20f
      0x4bdd65a5, // x = 0x1.bacb4ap24f
      0x4c803f2c, // x = 0x1.007e58p26f
      0x4f8ffb03, // x = 0x1.1ff606p32f
      0x5c569e88, // x = 0x1.ad3d1p57f
      0x5e68984e, // x = 0x1.d1309cp61f
      0x655890d3, // x = 0x1.b121a6p75f
      0x65de7ca6, // x = 0x1.bcf94cp76f
      0x6eb1a8ec, // x = 0x1.6351d8p94f
      0x7997f30a, // x = 0x1.2fe614p116f
  };

  for (int i = 0; i < N; ++i) {
    float x = float(FPBits_t(INPUTS[i]));
    EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Acosh, x,
                                   __llvm_libc::acoshf(x), 0.5);
  }
}