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annotate lib/CodeGen/AllocationOrder.h @ 33:e4204d083e25 LLVM3.5

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LLVM 3.5
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Thu, 12 Dec 2013 14:32:10 +0900
parents 95c75e76d11b
children 54457678186b
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1 //===-- llvm/CodeGen/AllocationOrder.h - Allocation Order -*- C++ -*-------===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 //
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10 // This file implements an allocation order for virtual registers.
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11 //
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12 // The preferred allocation order for a virtual register depends on allocation
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13 // hints and target hooks. The AllocationOrder class encapsulates all of that.
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14 //
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15 //===----------------------------------------------------------------------===//
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16
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17 #ifndef LLVM_CODEGEN_ALLOCATIONORDER_H
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18 #define LLVM_CODEGEN_ALLOCATIONORDER_H
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19
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20 #include "llvm/ADT/ArrayRef.h"
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21 #include "llvm/MC/MCRegisterInfo.h"
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22
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23 namespace llvm {
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24
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25 class RegisterClassInfo;
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26 class VirtRegMap;
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27
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28 class AllocationOrder {
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29 SmallVector<MCPhysReg, 16> Hints;
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30 ArrayRef<MCPhysReg> Order;
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31 int Pos;
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32
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33 public:
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34 /// Create a new AllocationOrder for VirtReg.
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35 /// @param VirtReg Virtual register to allocate for.
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36 /// @param VRM Virtual register map for function.
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37 /// @param RegClassInfo Information about reserved and allocatable registers.
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38 AllocationOrder(unsigned VirtReg,
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39 const VirtRegMap &VRM,
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40 const RegisterClassInfo &RegClassInfo);
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41
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42 /// Get the allocation order without reordered hints.
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43 ArrayRef<MCPhysReg> getOrder() const { return Order; }
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44
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45 /// Return the next physical register in the allocation order, or 0.
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46 /// It is safe to call next() again after it returned 0, it will keep
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47 /// returning 0 until rewind() is called.
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48 unsigned next(unsigned Limit = 0) {
0
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49 if (Pos < 0)
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50 return Hints.end()[Pos++];
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51 if (!Limit)
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52 Limit = Order.size();
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53 while (Pos < int(Limit)) {
0
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54 unsigned Reg = Order[Pos++];
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55 if (!isHint(Reg))
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56 return Reg;
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57 }
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58 return 0;
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59 }
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60
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61 /// As next(), but allow duplicates to be returned, and stop before the
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62 /// Limit'th register in the RegisterClassInfo allocation order.
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63 ///
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64 /// This can produce more than Limit registers if there are hints.
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65 unsigned nextWithDups(unsigned Limit) {
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66 if (Pos < 0)
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67 return Hints.end()[Pos++];
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68 if (Pos < int(Limit))
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69 return Order[Pos++];
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70 return 0;
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71 }
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72
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73 /// Start over from the beginning.
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74 void rewind() { Pos = -int(Hints.size()); }
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75
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76 /// Return true if the last register returned from next() was a preferred register.
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77 bool isHint() const { return Pos <= 0; }
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78
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79 /// Return true if PhysReg is a preferred register.
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80 bool isHint(unsigned PhysReg) const {
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81 return std::find(Hints.begin(), Hints.end(), PhysReg) != Hints.end();
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82 }
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83 };
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84
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85 } // end namespace llvm
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86
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87 #endif