Martin Kustermann
a64b06ec83
Issue https://dart-review.googlesource.com/c/sdk/+/115701 Change-Id: Ib579f0bbc8d694aec74afd837217316a10baf910 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/115707 Commit-Queue: Martin Kustermann <kustermann@google.com> Reviewed-by: Ryan Macnak <rmacnak@google.com> Reviewed-by: Daco Harkes <dacoharkes@google.com>
68 lines
1.6 KiB
C++
68 lines
1.6 KiB
C++
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#ifndef RUNTIME_PLATFORM_UTILS_WIN_H_
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#define RUNTIME_PLATFORM_UTILS_WIN_H_
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#if !defined(RUNTIME_PLATFORM_UTILS_H_)
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#error Do not include utils_win.h directly; use utils.h instead.
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#endif
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#include <intrin.h>
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#include <stdlib.h>
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namespace dart {
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inline int Utils::CountLeadingZeros(uword x) {
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unsigned long position; // NOLINT
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#if defined(ARCH_IS_32_BIT)
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_BitScanReverse(&position, x);
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#elif defined(ARCH_IS_64_BIT)
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_BitScanReverse64(&position, x);
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#else
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#error Architecture is not 32-bit or 64-bit.
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#endif
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return kBitsPerWord - static_cast<int>(position) - 1;
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}
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inline int Utils::CountTrailingZeros(uword x) {
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unsigned long result; // NOLINT
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#if defined(ARCH_IS_32_BIT)
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_BitScanForward(&result, x);
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#elif defined(ARCH_IS_64_BIT)
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_BitScanForward64(&result, x);
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#else
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#error Architecture is not 32-bit or 64-bit.
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#endif
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return static_cast<int>(result);
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}
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inline uint16_t Utils::HostToBigEndian16(uint16_t value) {
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return _byteswap_ushort(value);
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}
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inline uint32_t Utils::HostToBigEndian32(uint32_t value) {
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return _byteswap_ulong(value);
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}
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inline uint64_t Utils::HostToBigEndian64(uint64_t value) {
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return _byteswap_uint64(value);
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}
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inline uint16_t Utils::HostToLittleEndian16(uint16_t value) {
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return value;
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}
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inline uint32_t Utils::HostToLittleEndian32(uint32_t value) {
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return value;
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}
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inline uint64_t Utils::HostToLittleEndian64(uint64_t value) {
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return value;
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}
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} // namespace dart
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#endif // RUNTIME_PLATFORM_UTILS_WIN_H_
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