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/*
* Copyright (C) 2022 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:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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 APPLE INC. ``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 APPLE INC. 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.
*/
#pragma once
#include "CPU.h"
#include <wtf/PrintStream.h>
namespace JSC {
enum class Width : uint8_t {
Width8 = 0,
Width16,
Width32,
Width64,
Width128,
};
static constexpr Width Width8 = Width::Width8;
static constexpr Width Width16 = Width::Width16;
static constexpr Width Width32 = Width::Width32;
static constexpr Width Width64 = Width::Width64;
static constexpr Width Width128 = Width::Width128;
enum class PreservedWidth : uint8_t {
PreservesNothing = 0,
Preserves64 = 1,
};
static constexpr PreservedWidth PreservesNothing = PreservedWidth::PreservesNothing;
static constexpr PreservedWidth Preserves64 = PreservedWidth::Preserves64;
ALWAYS_INLINE constexpr Width widthForBytes(unsigned bytes)
{
switch (bytes) {
case 0:
case 1:
return Width8;
case 2:
return Width16;
case 3:
case 4:
return Width32;
case 5:
case 6:
case 7:
case 8:
return Width64;
default:
return Width128;
}
}
ALWAYS_INLINE constexpr unsigned bytesForWidth(Width width)
{
return 1 << static_cast<uint8_t>(width);
}
ALWAYS_INLINE constexpr unsigned alignmentForWidth(Width width)
{
switch (width) {
case Width8:
return 1;
case Width16:
return 2;
case Width32:
return 4;
case Width64:
return 8;
case Width128:
return 8;
}
RELEASE_ASSERT_NOT_REACHED();
return 0;
}
inline constexpr uint64_t mask(Width width)
{
switch (width) {
case Width8:
return 0x00000000000000ffllu;
case Width16:
return 0x000000000000ffffllu;
case Width32:
return 0x00000000ffffffffllu;
case Width64:
return 0xffffffffffffffffllu;
case Width128:
RELEASE_ASSERT_NOT_REACHED();
return 0;
}
RELEASE_ASSERT_NOT_REACHED();
return 0;
}
constexpr Width pointerWidth()
{
if (isAddress64Bit())
return Width64;
return Width32;
}
constexpr Width registerWidth()
{
if (isRegister64Bit())
return Width64;
return Width32;
}
inline Width canonicalWidth(Width width)
{
return std::max(Width32, width);
}
inline bool isCanonicalWidth(Width width)
{
return width >= Width32;
}
} // namespace JSC
namespace WTF {
void printInternal(PrintStream& out, JSC::Width width);
} // namespace WTF
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