mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-29 10:32:47 +00:00
c9672cb8be
registers for a given virtual register. Reserved registers are filtered from the allocation order, and any valid hint is returned as the first suggestion. For target dependent hints, a number of arcane target hooks are invoked. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121497 91177308-0d34-0410-b5e6-96231b3b80d8
55 lines
1.7 KiB
C++
55 lines
1.7 KiB
C++
//===-- llvm/CodeGen/AllocationOrder.h - Allocation Order -*- C++ -*-------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file implements an allocation order for virtual registers.
|
|
//
|
|
// The preferred allocation order for a virtual register depends on allocation
|
|
// hints and target hooks. The AllocationOrder class encapsulates all of that.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_CODEGEN_ALLOCATIONORDER_H
|
|
#define LLVM_CODEGEN_ALLOCATIONORDER_H
|
|
|
|
namespace llvm {
|
|
|
|
class BitVector;
|
|
class VirtRegMap;
|
|
|
|
class AllocationOrder {
|
|
const unsigned *Begin;
|
|
const unsigned *End;
|
|
const unsigned *Pos;
|
|
const BitVector &Reserved;
|
|
unsigned Hint;
|
|
public:
|
|
|
|
/// AllocationOrder - Create a new AllocationOrder for VirtReg.
|
|
/// @param VirtReg Virtual register to allocate for.
|
|
/// @param VRM Virtual register map for function.
|
|
/// @param ReservedRegs Set of reserved registers as returned by
|
|
/// TargetRegisterInfo::getReservedRegs().
|
|
AllocationOrder(unsigned VirtReg,
|
|
const VirtRegMap &VRM,
|
|
const BitVector &ReservedRegs);
|
|
|
|
/// next - Return the next physical register in the allocation order, or 0.
|
|
/// It is safe to call next again after it returned 0.
|
|
/// It will keep returning 0 until rewind() is called.
|
|
unsigned next();
|
|
|
|
/// rewind - Start over from the beginning.
|
|
void rewind() { Pos = 0; }
|
|
|
|
};
|
|
|
|
} // end namespace llvm
|
|
|
|
#endif
|