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// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
#include <intrin.h>
#include <stdlib.h>
namespace dart {
inline int Utils::CountTrailingZeros(uword x) {
unsigned long result; // NOLINT
#if defined(ARCH_IS_32_BIT)
_BitScanReverse(&result, x);
#elif defined(ARCH_IS_64_BIT)
_BitScanReverse64(&result, x);
#error Architecture is not 32-bit or 64-bit.
return static_cast<int>(result);
inline uint16_t Utils::HostToBigEndian16(uint16_t value) {
return _byteswap_ushort(value);
inline uint32_t Utils::HostToBigEndian32(uint32_t value) {
return _byteswap_ulong(value);
inline uint64_t Utils::HostToBigEndian64(uint64_t value) {
return _byteswap_uint64(value);
inline uint16_t Utils::HostToLittleEndian16(uint16_t value) {
return value;
inline uint32_t Utils::HostToLittleEndian32(uint32_t value) {
return value;
inline uint64_t Utils::HostToLittleEndian64(uint64_t value) {
return value;
} // namespace dart