1 //===-- llvm/CodeGen/AllocationOrder.cpp - Allocation Order ---------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements an allocation order for virtual registers.
12 // The preferred allocation order for a virtual register depends on allocation
13 // hints and target hooks. The AllocationOrder class encapsulates all of that.
15 //===----------------------------------------------------------------------===//
17 #define DEBUG_TYPE "regalloc"
18 #include "AllocationOrder.h"
19 #include "llvm/CodeGen/MachineFunction.h"
20 #include "llvm/CodeGen/MachineRegisterInfo.h"
21 #include "llvm/CodeGen/RegisterClassInfo.h"
22 #include "llvm/CodeGen/VirtRegMap.h"
23 #include "llvm/Support/Debug.h"
24 #include "llvm/Support/raw_ostream.h"
28 // Compare VirtRegMap::getRegAllocPref().
29 AllocationOrder::AllocationOrder(unsigned VirtReg,
30 const VirtRegMap &VRM,
31 const RegisterClassInfo &RegClassInfo)
33 const MachineFunction &MF = VRM.getMachineFunction();
34 const TargetRegisterInfo *TRI = &VRM.getTargetRegInfo();
35 Order = RegClassInfo.getOrder(MF.getRegInfo().getRegClass(VirtReg));
36 TRI->getRegAllocationHints(VirtReg, Order, Hints, MF, &VRM);
42 for (unsigned I = 0, E = Hints.size(); I != E; ++I)
43 dbgs() << ' ' << PrintReg(Hints[I], TRI);
48 for (unsigned I = 0, E = Hints.size(); I != E; ++I)
49 assert(std::find(Order.begin(), Order.end(), Hints[I]) != Order.end() &&
50 "Target hint is outside allocation order.");