mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
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91 lines
3.2 KiB
C++
91 lines
3.2 KiB
C++
/*
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* Copyright (C) 2015-2017 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#if ENABLE(B3_JIT)
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#include "AirOpcode.h"
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namespace JSC::B3::Air {
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inline Air::Opcode moveForType(Type type)
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{
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switch (type.kind()) {
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case Int32:
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return Move32;
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case Int64:
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RELEASE_ASSERT(is64Bit());
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return Move;
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case Float:
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return MoveFloat;
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case Double:
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return MoveDouble;
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case Void:
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case Tuple:
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break;
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}
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RELEASE_ASSERT_NOT_REACHED();
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return Air::Oops;
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}
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inline Air::Opcode relaxedMoveForType(Type type)
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{
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switch (type.kind()) {
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case Int32:
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case Int64:
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// For Int32, we could return Move or Move32. It's a trade-off.
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//
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// Move32: Using Move32 guarantees that we use the narrower move, but in cases where the
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// register allocator can't prove that the variables involved are 32-bit, this will
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// disable coalescing.
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//
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// Move: Using Move guarantees that the register allocator can coalesce normally, but in
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// cases where it can't prove that the variables are 32-bit and it doesn't coalesce,
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// this will force us to use a full 64-bit Move instead of the slightly cheaper
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// 32-bit Move32.
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//
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// Coalescing is a lot more profitable than turning Move into Move32. So, it's better to
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// use Move here because in cases where the register allocator cannot prove that
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// everything is 32-bit, we still get coalescing.
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return Move;
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case Float:
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// MoveFloat is always coalescable and we never convert MoveDouble to MoveFloat, so we
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// should use MoveFloat when we know that the temporaries involved are 32-bit.
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return MoveFloat;
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case Double:
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return MoveDouble;
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case Void:
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case Tuple:
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break;
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}
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RELEASE_ASSERT_NOT_REACHED();
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return Air::Oops;
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}
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} // namespace JSC::B3::Air
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#endif // ENABLE(B3_JIT)
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