1 //===-- LiveRangeUtils.h - Live Range modification utilities ----*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 /// This file contains helper functions to modify live ranges. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #ifndef LLVM_LIB_CODEGEN_LIVERANGEUTILS_H 15 #define LLVM_LIB_CODEGEN_LIVERANGEUTILS_H 16 17 #include "llvm/CodeGen/LiveInterval.h" 18 19 namespace llvm { 20 21 /// Helper function that distributes live range value numbers and the 22 /// corresponding segments of a master live range \p LR to a list of newly 23 /// created live ranges \p SplitLRs. \p VNIClasses maps each value number in \p 24 /// LR to 0 meaning it should stay or to 1..N meaning it should go to a specific 25 /// live range in the \p SplitLRs array. 26 template<typename LiveRangeT, typename EqClassesT> 27 static void DistributeRange(LiveRangeT &LR, LiveRangeT *SplitLRs[], 28 EqClassesT VNIClasses) { 29 // Move segments to new intervals. 30 typename LiveRangeT::iterator J = LR.begin(), E = LR.end(); 31 while (J != E && VNIClasses[J->valno->id] == 0) 32 ++J; 33 for (typename LiveRangeT::iterator I = J; I != E; ++I) { 34 if (unsigned eq = VNIClasses[I->valno->id]) { 35 assert((SplitLRs[eq-1]->empty() || SplitLRs[eq-1]->expiredAt(I->start)) && 36 "New intervals should be empty"); 37 SplitLRs[eq-1]->segments.push_back(*I); 38 } else 39 *J++ = *I; 40 } 41 LR.segments.erase(J, E); 42 43 // Transfer VNInfos to their new owners and renumber them. 44 unsigned j = 0, e = LR.getNumValNums(); 45 while (j != e && VNIClasses[j] == 0) 46 ++j; 47 for (unsigned i = j; i != e; ++i) { 48 VNInfo *VNI = LR.getValNumInfo(i); 49 if (unsigned eq = VNIClasses[i]) { 50 VNI->id = SplitLRs[eq-1]->getNumValNums(); 51 SplitLRs[eq-1]->valnos.push_back(VNI); 52 } else { 53 VNI->id = j; 54 LR.valnos[j++] = VNI; 55 } 56 } 57 LR.valnos.resize(j); 58 } 59 60 } // End llvm namespace 61 62 #endif 63
