/* * Copyright (C) 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 "CPU.h" #include "Options.h" namespace JSC { namespace B3 { namespace Air { class Code; // This implements the Poletto and Sarkar register allocator called "linear scan": // http://dl.acm.org/citation.cfm?id=330250 // // This is not Air's primary register allocator. We use it only when running at optLevel<2. // That's not the default level. This register allocator is optimized primarily for running // quickly. It's expected that improvements to this register allocator should focus on improving // its execution time without much regard for the quality of generated code. If you want good // code, use graph coloring. // // For Air's primary register allocator, see AirAllocateRegistersByGraphColoring.h|cpp. // // This also does stack allocation as an afterthought. It does not do any spill coalescing. void allocateRegistersAndStackByLinearScan(Code&); } } } // namespace JSC::B3::Air #endif // ENABLE(B3_JIT)