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AirHelpers.h
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90 lines (82 loc) · 3.18 KB
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/*
* Copyright (C) 2015-2017 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
#if ENABLE(B3_JIT)
#include "AirOpcode.h"
namespace JSC::B3::Air {
inline Air::Opcode moveForType(Type type)
{
switch (type.kind()) {
case Int32:
return Move32;
case Int64:
RELEASE_ASSERT(is64Bit());
return Move;
case Float:
return MoveFloat;
case Double:
return MoveDouble;
case Void:
case Tuple:
break;
}
RELEASE_ASSERT_NOT_REACHED();
return Air::Oops;
}
inline Air::Opcode relaxedMoveForType(Type type)
{
switch (type.kind()) {
case Int32:
case Int64:
// For Int32, we could return Move or Move32. It's a trade-off.
//
// Move32: Using Move32 guarantees that we use the narrower move, but in cases where the
// register allocator can't prove that the variables involved are 32-bit, this will
// disable coalescing.
//
// Move: Using Move guarantees that the register allocator can coalesce normally, but in
// cases where it can't prove that the variables are 32-bit and it doesn't coalesce,
// this will force us to use a full 64-bit Move instead of the slightly cheaper
// 32-bit Move32.
//
// Coalescing is a lot more profitable than turning Move into Move32. So, it's better to
// use Move here because in cases where the register allocator cannot prove that
// everything is 32-bit, we still get coalescing.
return Move;
case Float:
// MoveFloat is always coalescable and we never convert MoveDouble to MoveFloat, so we
// should use MoveFloat when we know that the temporaries involved are 32-bit.
return MoveFloat;
case Double:
return MoveDouble;
case Void:
case Tuple:
break;
}
RELEASE_ASSERT_NOT_REACHED();
return Air::Oops;
}
} // namespace JSC::B3::Air
#endif // ENABLE(B3_JIT)