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Merged
mborland merged 3 commits into from
Mar 31, 2026
Merged

Update vendored version of int128 #1353

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626fb24
Update vendored version of int128
mborland Mar 31, 2026
58ce113
Fix or ignore new GCC warnings
mborland Mar 31, 2026
51f3cdd
Clang doesn't know useless-cast
mborland Mar 31, 2026
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56 changes: 28 additions & 28 deletions include/boost/decimal/detail/int128/bit.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -5,69 +5,69 @@
#ifndef BOOST_DECIMAL_DETAIL_INT128_BIT_HPP
#define BOOST_DECIMAL_DETAIL_INT128_BIT_HPP

#include "int128.hpp"
#include "detail/config.hpp"
#include "detail/clz.hpp"
#include "detail/ctz.hpp"
#include <boost/decimal/detail/int128/int128.hpp>
#include <boost/decimal/detail/int128/detail/config.hpp>
#include <boost/decimal/detail/int128/detail/clz.hpp>
#include <boost/decimal/detail/int128/detail/ctz.hpp>

namespace boost {
namespace int128 {

constexpr bool has_single_bit(const uint128_t x) noexcept
BOOST_DECIMAL_DETAIL_INT128_EXPORT BOOST_DECIMAL_DETAIL_INT128_HOST_DEVICE constexpr bool has_single_bit(const uint128_t x) noexcept
{
return x && !(x & (x - 1U));
}

constexpr int countl_zero(const uint128_t x) noexcept
BOOST_DECIMAL_DETAIL_INT128_EXPORT BOOST_DECIMAL_DETAIL_INT128_HOST_DEVICE constexpr int countl_zero(const uint128_t x) noexcept
{
return x.high == 0 ? 64 + detail::countl_zero(x.low) : detail::countl_zero(x.high);
}

constexpr int countl_one(const uint128_t x) noexcept
BOOST_DECIMAL_DETAIL_INT128_EXPORT BOOST_DECIMAL_DETAIL_INT128_HOST_DEVICE constexpr int countl_one(const uint128_t x) noexcept
{
return countl_zero(~x);
}

constexpr int bit_width(const uint128_t x) noexcept
BOOST_DECIMAL_DETAIL_INT128_EXPORT BOOST_DECIMAL_DETAIL_INT128_HOST_DEVICE constexpr int bit_width(const uint128_t x) noexcept
{
return x ? 128 - countl_zero(x) : 0;
}

constexpr uint128_t bit_ceil(const uint128_t x) noexcept
BOOST_DECIMAL_DETAIL_INT128_EXPORT BOOST_DECIMAL_DETAIL_INT128_HOST_DEVICE constexpr uint128_t bit_ceil(const uint128_t x) noexcept
{
return x <= 1U ? static_cast<uint128_t>(1) : static_cast<uint128_t>(1) << bit_width(x - 1U);
}

constexpr uint128_t bit_floor(const uint128_t x) noexcept
BOOST_DECIMAL_DETAIL_INT128_EXPORT BOOST_DECIMAL_DETAIL_INT128_HOST_DEVICE constexpr uint128_t bit_floor(const uint128_t x) noexcept
{
return x > 0U ? static_cast<uint128_t>(1) << (bit_width(x) - 1U) : static_cast<uint128_t>(0);
}

constexpr int countr_zero(const uint128_t x) noexcept
BOOST_DECIMAL_DETAIL_INT128_EXPORT BOOST_DECIMAL_DETAIL_INT128_HOST_DEVICE constexpr int countr_zero(const uint128_t x) noexcept
{
return x.low == 0 ? 64 + detail::countr_zero(x.high) : detail::countr_zero(x.low);
}

constexpr int countr_one(const uint128_t x) noexcept
BOOST_DECIMAL_DETAIL_INT128_EXPORT BOOST_DECIMAL_DETAIL_INT128_HOST_DEVICE constexpr int countr_one(const uint128_t x) noexcept
{
return countr_zero(~x);
}

constexpr uint128_t rotl(const uint128_t x, const int s) noexcept
BOOST_DECIMAL_DETAIL_INT128_EXPORT BOOST_DECIMAL_DETAIL_INT128_HOST_DEVICE constexpr uint128_t rotl(const uint128_t x, const int s) noexcept
{
constexpr auto mask {127U};
return x << (static_cast<unsigned>(s) & mask) | x >> (static_cast<unsigned>(-s) & mask);
}

constexpr uint128_t rotr(const uint128_t x, const int s) noexcept
BOOST_DECIMAL_DETAIL_INT128_EXPORT BOOST_DECIMAL_DETAIL_INT128_HOST_DEVICE constexpr uint128_t rotr(const uint128_t x, const int s) noexcept
{
constexpr auto mask {127U};
return x >> (static_cast<unsigned>(s) & mask) | x << (static_cast<unsigned>(-s) & mask);
}

#if BOOST_DECIMAL_DETAIL_INT128_HAS_BUILTIN(__builtin_popcountll)
#if BOOST_DECIMAL_DETAIL_INT128_HAS_BUILTIN(__builtin_popcountll) && !(defined(__CUDACC__) && defined(BOOST_DECIMAL_DETAIL_INT128_ENABLE_CUDA))

constexpr int popcount(const uint128_t x) noexcept
BOOST_DECIMAL_DETAIL_INT128_EXPORT BOOST_DECIMAL_DETAIL_INT128_HOST_DEVICE constexpr int popcount(const uint128_t x) noexcept
{
return __builtin_popcountll(x.high) + __builtin_popcountll(x.low);
}
Expand All @@ -76,7 +76,7 @@ constexpr int popcount(const uint128_t x) noexcept

namespace impl {

constexpr int popcount_impl(std::uint64_t x) noexcept
BOOST_DECIMAL_DETAIL_INT128_HOST_DEVICE constexpr int popcount_impl(std::uint64_t x) noexcept
{
x = x - ((x >> 1U) & UINT64_C(0x5555555555555555));
x = (x & UINT64_C(0x3333333333333333)) + ((x >> 2U) & UINT64_C(0x3333333333333333));
Expand All @@ -89,7 +89,7 @@ constexpr int popcount_impl(std::uint64_t x) noexcept

#if defined(_M_AMD64) && !defined(BOOST_DECIMAL_DETAIL_INT128_NO_CONSTEVAL_DETECTION) && !BOOST_DECIMAL_DETAIL_INT128_HAS_BUILTIN(__builtin_popcountll)

constexpr int popcount(const uint128_t x) noexcept
BOOST_DECIMAL_DETAIL_INT128_EXPORT BOOST_DECIMAL_DETAIL_INT128_HOST_DEVICE constexpr int popcount(const uint128_t x) noexcept
{
if (BOOST_DECIMAL_DETAIL_INT128_IS_CONSTANT_EVALUATED(x))
{
Expand All @@ -111,7 +111,7 @@ constexpr int popcount(const uint128_t x) noexcept

#elif defined(_M_IX86) && !defined(BOOST_DECIMAL_DETAIL_INT128_NO_CONSTEVAL_DETECTION) && !BOOST_DECIMAL_DETAIL_INT128_HAS_BUILTIN(__builtin_popcountll)

constexpr int popcount(const uint128_t x) noexcept
BOOST_DECIMAL_DETAIL_INT128_EXPORT BOOST_DECIMAL_DETAIL_INT128_HOST_DEVICE constexpr int popcount(const uint128_t x) noexcept
{
if (BOOST_DECIMAL_DETAIL_INT128_IS_CONSTANT_EVALUATED(x))
{
Expand Down Expand Up @@ -139,18 +139,18 @@ constexpr int popcount(const uint128_t x) noexcept
}
}

#elif !BOOST_DECIMAL_DETAIL_INT128_HAS_BUILTIN(__builtin_popcountll)
#elif !BOOST_DECIMAL_DETAIL_INT128_HAS_BUILTIN(__builtin_popcountll) || (defined(__CUDACC__) && defined(BOOST_DECIMAL_DETAIL_INT128_ENABLE_CUDA))

constexpr int popcount(const uint128_t x) noexcept
BOOST_DECIMAL_DETAIL_INT128_EXPORT BOOST_DECIMAL_DETAIL_INT128_HOST_DEVICE constexpr int popcount(const uint128_t x) noexcept
{
return impl::popcount_impl(x.high) + impl::popcount_impl(x.low);
}

#endif

#if BOOST_DECIMAL_DETAIL_INT128_HAS_BUILTIN(__builtin_bswap64)
#if BOOST_DECIMAL_DETAIL_INT128_HAS_BUILTIN(__builtin_bswap64) && !(defined(__CUDACC__) && defined(BOOST_DECIMAL_DETAIL_INT128_ENABLE_CUDA))

constexpr uint128_t byteswap(const uint128_t x) noexcept
BOOST_DECIMAL_DETAIL_INT128_EXPORT BOOST_DECIMAL_DETAIL_INT128_HOST_DEVICE constexpr uint128_t byteswap(const uint128_t x) noexcept
{
return {__builtin_bswap64(x.low), __builtin_bswap64(x.high)};
}
Expand All @@ -159,14 +159,14 @@ constexpr uint128_t byteswap(const uint128_t x) noexcept

namespace impl {

constexpr std::uint64_t byteswap_impl(const std::uint64_t x) noexcept
BOOST_DECIMAL_DETAIL_INT128_EXPORT BOOST_DECIMAL_DETAIL_INT128_HOST_DEVICE constexpr std::uint64_t byteswap_impl(const std::uint64_t x) noexcept
{
const auto step32 {x << 32U | x >> 32U};
const auto step16 {(step32 & UINT64_C(0x0000FFFF0000FFFF)) << 16U | (step32 & UINT64_C(0xFFFF0000FFFF0000)) >> 16U};
return (step16 & UINT64_C(0x00FF00FF00FF00FF)) << 8U | (step16 & UINT64_C(0xFF00FF00FF00FF00)) >> 8U;
}

constexpr uint128_t byteswap_impl(const uint128_t x) noexcept
BOOST_DECIMAL_DETAIL_INT128_EXPORT BOOST_DECIMAL_DETAIL_INT128_HOST_DEVICE constexpr uint128_t byteswap_impl(const uint128_t x) noexcept
{
return {byteswap_impl(x.low), byteswap_impl(x.high)};
}
Expand All @@ -175,7 +175,7 @@ constexpr uint128_t byteswap_impl(const uint128_t x) noexcept

#if defined(_MSC_VER) && !defined(BOOST_DECIMAL_DETAIL_INT128_NO_CONSTEVAL_DETECTION) && !BOOST_DECIMAL_DETAIL_INT128_HAS_BUILTIN(__builtin_bswap64)

constexpr uint128_t byteswap(const uint128_t x) noexcept
BOOST_DECIMAL_DETAIL_INT128_EXPORT BOOST_DECIMAL_DETAIL_INT128_HOST_DEVICE constexpr uint128_t byteswap(const uint128_t x) noexcept
{
if (BOOST_DECIMAL_DETAIL_INT128_IS_CONSTANT_EVALUATED(x))
{
Expand All @@ -187,9 +187,9 @@ constexpr uint128_t byteswap(const uint128_t x) noexcept
}
}

#elif !BOOST_DECIMAL_DETAIL_INT128_HAS_BUILTIN(__builtin_bswap64)
#elif !BOOST_DECIMAL_DETAIL_INT128_HAS_BUILTIN(__builtin_bswap64) || (defined(__CUDACC__) && defined(BOOST_DECIMAL_DETAIL_INT128_ENABLE_CUDA))

constexpr uint128_t byteswap(const uint128_t x) noexcept
BOOST_DECIMAL_DETAIL_INT128_EXPORT BOOST_DECIMAL_DETAIL_INT128_HOST_DEVICE constexpr uint128_t byteswap(const uint128_t x) noexcept
{
return impl::byteswap_impl(x);
}
Expand Down
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