1/* 2 * Copyright (C) 2014 Apple Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#ifndef FTLWeightedTarget_h 27#define FTLWeightedTarget_h 28 29#if ENABLE(FTL_JIT) 30 31#include "FTLAbbreviatedTypes.h" 32#include "FTLWeight.h" 33 34namespace JSC { namespace FTL { 35 36class WeightedTarget { 37public: 38 WeightedTarget() 39 : m_target(nullptr) 40 { 41 } 42 43 WeightedTarget(LBasicBlock target, Weight weight) 44 : m_target(target) 45 , m_weight(weight) 46 { 47 } 48 49 WeightedTarget(LBasicBlock target, float weight) 50 : m_target(target) 51 , m_weight(weight) 52 { 53 } 54 55 LBasicBlock target() const { return m_target; } 56 Weight weight() const { return m_weight; } 57 58private: 59 LBasicBlock m_target; 60 Weight m_weight; 61}; 62 63// Helpers for creating weighted targets for statically known (or unknown) branch 64// profiles. 65 66inline WeightedTarget usually(LBasicBlock block) 67{ 68 return WeightedTarget(block, 1); 69} 70 71inline WeightedTarget rarely(LBasicBlock block) 72{ 73 return WeightedTarget(block, 0); 74} 75 76// This means we let LLVM figure it out basic on its static estimates. LLVM's static 77// estimates are usually pretty darn good, so there's generally nothing wrong with 78// using this. 79inline WeightedTarget unsure(LBasicBlock block) 80{ 81 return WeightedTarget(block, Weight()); 82} 83 84} } // namespace JSC::FTL 85 86#endif // ENABLE(FTL_JIT) 87 88#endif // FTLWeightedTarget_h 89 90