56 lines
1.9 KiB
C++
56 lines
1.9 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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#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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using namespace llvm;
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#define DEBUG_TYPE "regalloc"
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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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const LiveRegMatrix *Matrix)
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: Pos(0), HardHints(false) {
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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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if (TRI->getRegAllocationHints(VirtReg, Order, Hints, MF, &VRM, Matrix))
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HardHints = true;
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rewind();
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LLVM_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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#ifndef NDEBUG
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for (unsigned I = 0, E = Hints.size(); I != E; ++I)
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assert(is_contained(Order, Hints[I]) &&
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"Target hint is outside allocation order.");
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#endif
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}
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