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/*
* Copyright (C) 2023 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* License header from dragonbox
* https://github.com/jk-jeon/dragonbox/blob/master/LICENSE-Boost
* https://github.com/jk-jeon/dragonbox/blob/master/LICENSE-Apache2-LLVM
*/
#pragma once
#include <wtf/Int128.h>
namespace WTF {
namespace dragonbox {
namespace detail {
////////////////////////////////////////////////////////////////////////////////////////
// Utilities for wide unsigned integer arithmetic.
////////////////////////////////////////////////////////////////////////////////////////
namespace wuint {
inline constexpr uint64_t umul64(uint32_t x, uint32_t y) noexcept
{
return x * static_cast<uint64_t>(y);
}
// Get 128-bit result of multiplication of two 64-bit unsigned integers.
inline constexpr UInt128 umul128(uint64_t x, uint64_t y) noexcept
{
return static_cast<UInt128>(x) * static_cast<UInt128>(y);
}
inline constexpr uint64_t umul128_upper64(uint64_t x, uint64_t y) noexcept
{
return static_cast<uint64_t>((static_cast<UInt128>(x) * static_cast<UInt128>(y)) >> 64);
}
// Get upper 128-bits of multiplication of a 64-bit unsigned integer and a 128-bit
// unsigned integer.
inline constexpr UInt128 umul192_upper128(uint64_t x, UInt128 y) noexcept
{
uint64_t y_high = static_cast<uint64_t>(y >> 64);
uint64_t y_low = static_cast<uint64_t>(y);
auto r = umul128(x, y_high);
r = r + static_cast<UInt128>(umul128_upper64(x, y_low));
return r;
}
// Get upper 64-bits of multiplication of a 32-bit unsigned integer and a 64-bit
// unsigned integer.
inline constexpr uint64_t umul96_upper64(uint32_t x, uint64_t y) noexcept
{
return umul128_upper64(static_cast<uint64_t>(x) << 32, y);
}
// Get lower 128-bits of multiplication of a 64-bit unsigned integer and a 128-bit
// unsigned integer.
inline constexpr UInt128 umul192_lower128(uint64_t x, UInt128 y) noexcept
{
return static_cast<UInt128>(x) * y;
}
// Get lower 64-bits of multiplication of a 32-bit unsigned integer and a 64-bit
// unsigned integer.
constexpr uint64_t umul96_lower64(uint32_t x, uint64_t y) noexcept
{
return static_cast<uint64_t>(x) * y;
}
} // namespace wuint
} // namespace detail
} // namespace dragonbox
} // namespace WTF
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