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a1514e24cc
missed in the first pass because the script didn't yet handle include guards. Note that the script is now able to handle all of these headers without manual edits. =] git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169224 91177308-0d34-0410-b5e6-96231b3b80d8
66 lines
2.1 KiB
C++
66 lines
2.1 KiB
C++
//===-- llvm/CodeGen/AllocationOrder.cpp - Allocation Order ---------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements an allocation order for virtual registers.
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//
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// The preferred allocation order for a virtual register depends on allocation
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// hints and target hooks. The AllocationOrder class encapsulates all of that.
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "regalloc"
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#include "AllocationOrder.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineRegisterInfo.h"
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#include "llvm/CodeGen/RegisterClassInfo.h"
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#include "llvm/CodeGen/VirtRegMap.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Target/TargetMachine.h"
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using namespace llvm;
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// Compare VirtRegMap::getRegAllocPref().
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AllocationOrder::AllocationOrder(unsigned VirtReg,
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const VirtRegMap &VRM,
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const RegisterClassInfo &RegClassInfo)
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: Pos(0) {
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const MachineFunction &MF = VRM.getMachineFunction();
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const TargetRegisterInfo *TRI = &VRM.getTargetRegInfo();
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Order = RegClassInfo.getOrder(MF.getRegInfo().getRegClass(VirtReg));
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TRI->getRegAllocationHints(VirtReg, Order, Hints, MF, &VRM);
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DEBUG({
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if (!Hints.empty()) {
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dbgs() << "hints:";
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for (unsigned I = 0, E = Hints.size(); I != E; ++I)
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dbgs() << ' ' << PrintReg(Hints[I], TRI);
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dbgs() << '\n';
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}
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});
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}
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bool AllocationOrder::isHint(unsigned PhysReg) const {
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return std::find(Hints.begin(), Hints.end(), PhysReg) != Hints.end();
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}
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unsigned AllocationOrder::next() {
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if (Pos < Hints.size())
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return Hints[Pos++];
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ArrayRef<MCPhysReg>::iterator I = Order.begin() + (Pos - Hints.size());
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ArrayRef<MCPhysReg>::iterator E = Order.end();
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while (I != E) {
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unsigned Reg = *I++;
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++Pos;
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if (!isHint(Reg))
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return Reg;
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}
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return 0;
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}
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