//===-- Unittests for roundl ----------------------------------------------===//
//
// 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/math/roundl.h"
#include "utils/FPUtil/FPBits.h"
#include "utils/FPUtil/TestHelpers.h"
#include "utils/MPFRWrapper/MPFRUtils.h"
#include "utils/UnitTest/Test.h"
#include <math.h>

using FPBits = __llvm_libc::fputil::FPBits<long double>;

namespace mpfr = __llvm_libc::testing::mpfr;

DECLARE_SPECIAL_CONSTANTS(long double)

TEST(LlvmLibcRoundlTest, SpecialNumbers) {
  EXPECT_FP_EQ(zero, __llvm_libc::roundl(zero));
  EXPECT_FP_EQ(negZero, __llvm_libc::roundl(negZero));

  EXPECT_FP_EQ(inf, __llvm_libc::roundl(inf));
  EXPECT_FP_EQ(negInf, __llvm_libc::roundl(negInf));

  EXPECT_FP_EQ(aNaN, __llvm_libc::roundl(aNaN));
}

TEST(LlvmLibcRoundlTest, RoundedNumbers) {
  EXPECT_FP_EQ(1.0l, __llvm_libc::roundl(1.0l));
  EXPECT_FP_EQ(-1.0l, __llvm_libc::roundl(-1.0l));
  EXPECT_FP_EQ(10.0l, __llvm_libc::roundl(10.0l));
  EXPECT_FP_EQ(-10.0l, __llvm_libc::roundl(-10.0l));
  EXPECT_FP_EQ(1234.0l, __llvm_libc::roundl(1234.0l));
  EXPECT_FP_EQ(-1234.0l, __llvm_libc::roundl(-1234.0l));
}

TEST(LlvmLibcRoundlTest, Fractions) {
  EXPECT_FP_EQ(1.0l, __llvm_libc::roundl(0.5l));
  EXPECT_FP_EQ(-1.0l, __llvm_libc::roundl(-0.5l));
  EXPECT_FP_EQ(0.0l, __llvm_libc::roundl(0.115l));
  EXPECT_FP_EQ(-0.0l, __llvm_libc::roundl(-0.115l));
  EXPECT_FP_EQ(1.0l, __llvm_libc::roundl(0.715l));
  EXPECT_FP_EQ(-1.0l, __llvm_libc::roundl(-0.715l));
  EXPECT_FP_EQ(1.0l, __llvm_libc::roundl(1.3l));
  EXPECT_FP_EQ(-1.0l, __llvm_libc::roundl(-1.3l));
  EXPECT_FP_EQ(2.0l, __llvm_libc::roundl(1.5l));
  EXPECT_FP_EQ(-2.0l, __llvm_libc::roundl(-1.5l));
  EXPECT_FP_EQ(2.0l, __llvm_libc::roundl(1.75l));
  EXPECT_FP_EQ(-2.0l, __llvm_libc::roundl(-1.75l));
  EXPECT_FP_EQ(10.0l, __llvm_libc::roundl(10.32l));
  EXPECT_FP_EQ(-10.0l, __llvm_libc::roundl(-10.32l));
  EXPECT_FP_EQ(11.0l, __llvm_libc::roundl(10.65l));
  EXPECT_FP_EQ(-11.0l, __llvm_libc::roundl(-10.65l));
  EXPECT_FP_EQ(1234.0l, __llvm_libc::roundl(1234.38l));
  EXPECT_FP_EQ(-1234.0l, __llvm_libc::roundl(-1234.38l));
  EXPECT_FP_EQ(1235.0l, __llvm_libc::roundl(1234.96l));
  EXPECT_FP_EQ(-1235.0l, __llvm_libc::roundl(-1234.96l));
}

TEST(LlvmLibcRoundlTest, InLongDoubleRange) {
  using UIntType = FPBits::UIntType;
  constexpr UIntType count = 10000000;
  constexpr UIntType step = UIntType(-1) / count;
  for (UIntType i = 0, v = 0; i <= count; ++i, v += step) {
    long double x = FPBits(v);
    if (isnan(x) || isinf(x))
      continue;

    ASSERT_MPFR_MATCH(mpfr::Operation::Round, x, __llvm_libc::roundl(x), 0.0);
  }
}