/* * 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)