tvl-depot/absl/random/internal/wide_multiply.h
Abseil Team 12bc53e031 Export of internal Abseil changes
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c99f979ad34f155fbeeea69b88bdc7458d89a21c by Derek Mauro <dmauro@google.com>:

Remove a floating point division by zero test.

This isn't testing behavior related to the library, and MSVC warns
about it in opt mode.

PiperOrigin-RevId: 285220804

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68b015491f0dbf1ab547994673281abd1f34cd4b by Gennadiy Rozental <rogeeff@google.com>:

This CL introduces following changes to the class FlagImpl:
* We eliminate the CommandLineFlagLocks struct. Instead callback guard and callback function are combined into a single CallbackData struct, while primary data lock is stored separately.
* CallbackData member of class FlagImpl is initially set to be nullptr and is only allocated and initialized when a flag's callback is being set. For most flags we do not pay for the extra space and extra absl::Mutex now.
* Primary data guard is stored in data_guard_ data member. This is a properly aligned character buffer of necessary size. During initialization of the flag we construct absl::Mutex in this space using placement new call.
* We now avoid extra value copy after successful attempt to parse value out of string. Instead we swap flag's current value with tentative value we just produced.

PiperOrigin-RevId: 285132636

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ed45d118fb818969eb13094cf7827c885dfc562c by Tom Manshreck <shreck@google.com>:

Change null-term* (and nul-term*) to NUL-term* in comments

PiperOrigin-RevId: 285036610

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729619017944db895ce8d6d29c1995aa2e5628a5 by Derek Mauro <dmauro@google.com>:

Use the Posix implementation of thread identity on MinGW.
Some versions of MinGW suffer from thread_local bugs.

PiperOrigin-RevId: 285022920

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39a25493503c76885bc3254c28f66a251c5b5bb0 by Greg Falcon <gfalcon@google.com>:

Implementation detail change.

Add further ABSL_NAMESPACE_BEGIN and _END annotation macros to files in Abseil.

PiperOrigin-RevId: 285012012
GitOrigin-RevId: c99f979ad34f155fbeeea69b88bdc7458d89a21c
Change-Id: I4c85d3704e45d11a9ac50d562f39640a6adbedc1
2019-12-12 15:37:13 -05:00

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3.7 KiB
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// Copyright 2017 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef ABSL_RANDOM_INTERNAL_WIDE_MULTIPLY_H_
#define ABSL_RANDOM_INTERNAL_WIDE_MULTIPLY_H_
#include <cstdint>
#include <limits>
#include <type_traits>
#if (defined(_WIN32) || defined(_WIN64)) && defined(_M_IA64)
#include <intrin.h> // NOLINT(build/include_order)
#pragma intrinsic(_umul128)
#define ABSL_INTERNAL_USE_UMUL128 1
#endif
#include "absl/base/config.h"
#include "absl/base/internal/bits.h"
#include "absl/numeric/int128.h"
#include "absl/random/internal/traits.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace random_internal {
// Helper object to multiply two 64-bit values to a 128-bit value.
// MultiplyU64ToU128 multiplies two 64-bit values to a 128-bit value.
// If an intrinsic is available, it is used, otherwise use native 32-bit
// multiplies to construct the result.
inline uint128 MultiplyU64ToU128(uint64_t a, uint64_t b) {
#if defined(ABSL_HAVE_INTRINSIC_INT128)
return uint128(static_cast<__uint128_t>(a) * b);
#elif defined(ABSL_INTERNAL_USE_UMUL128)
// uint64_t * uint64_t => uint128 multiply using imul intrinsic on MSVC.
uint64_t high = 0;
const uint64_t low = _umul128(a, b, &high);
return absl::MakeUint128(high, low);
#else
// uint128(a) * uint128(b) in emulated mode computes a full 128-bit x 128-bit
// multiply. However there are many cases where that is not necessary, and it
// is only necessary to support a 64-bit x 64-bit = 128-bit multiply. This is
// for those cases.
const uint64_t a00 = static_cast<uint32_t>(a);
const uint64_t a32 = a >> 32;
const uint64_t b00 = static_cast<uint32_t>(b);
const uint64_t b32 = b >> 32;
const uint64_t c00 = a00 * b00;
const uint64_t c32a = a00 * b32;
const uint64_t c32b = a32 * b00;
const uint64_t c64 = a32 * b32;
const uint32_t carry =
static_cast<uint32_t>(((c00 >> 32) + static_cast<uint32_t>(c32a) +
static_cast<uint32_t>(c32b)) >>
32);
return absl::MakeUint128(c64 + (c32a >> 32) + (c32b >> 32) + carry,
c00 + (c32a << 32) + (c32b << 32));
#endif
}
// wide_multiply<T> multiplies two N-bit values to a 2N-bit result.
template <typename UIntType>
struct wide_multiply {
static constexpr size_t kN = std::numeric_limits<UIntType>::digits;
using input_type = UIntType;
using result_type = typename random_internal::unsigned_bits<kN * 2>::type;
static result_type multiply(input_type a, input_type b) {
return static_cast<result_type>(a) * b;
}
static input_type hi(result_type r) { return r >> kN; }
static input_type lo(result_type r) { return r; }
static_assert(std::is_unsigned<UIntType>::value,
"Class-template wide_multiply<> argument must be unsigned.");
};
#ifndef ABSL_HAVE_INTRINSIC_INT128
template <>
struct wide_multiply<uint64_t> {
using input_type = uint64_t;
using result_type = uint128;
static result_type multiply(uint64_t a, uint64_t b) {
return MultiplyU64ToU128(a, b);
}
static uint64_t hi(result_type r) { return Uint128High64(r); }
static uint64_t lo(result_type r) { return Uint128Low64(r); }
};
#endif
} // namespace random_internal
ABSL_NAMESPACE_END
} // namespace absl
#endif // ABSL_RANDOM_INTERNAL_WIDE_MULTIPLY_H_