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14b971e075
This changes TargetFrameLowering::processFunctionBeforeCalleeSavedScan(): - Rename the function to determineCalleeSaves() - Pass a bitset of callee saved registers by reference, thus avoiding the function-global PhysRegUsed bitset in MachineRegisterInfo. - Without PhysRegUsed the implementation is fine tuned to not save physcial registers which are only read but never modified. Related to rdar://21539507 Differential Revision: http://reviews.llvm.org/D10909 llvm-svn: 242165
41 lines
1.5 KiB
C++
41 lines
1.5 KiB
C++
//===-- BPFFrameLowering.cpp - BPF Frame Information ----------------------===//
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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 contains the BPF implementation of TargetFrameLowering class.
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//
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//===----------------------------------------------------------------------===//
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#include "BPFFrameLowering.h"
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#include "BPFInstrInfo.h"
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#include "BPFSubtarget.h"
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#include "llvm/CodeGen/MachineFrameInfo.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineInstrBuilder.h"
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#include "llvm/CodeGen/MachineRegisterInfo.h"
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using namespace llvm;
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bool BPFFrameLowering::hasFP(const MachineFunction &MF) const { return true; }
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void BPFFrameLowering::emitPrologue(MachineFunction &MF,
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MachineBasicBlock &MBB) const {}
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void BPFFrameLowering::emitEpilogue(MachineFunction &MF,
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MachineBasicBlock &MBB) const {}
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void BPFFrameLowering::determineCalleeSaves(MachineFunction &MF,
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BitVector &SavedRegs,
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RegScavenger *RS) const {
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TargetFrameLowering::determineCalleeSaves(MF, SavedRegs, RS);
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SavedRegs.reset(BPF::R6);
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SavedRegs.reset(BPF::R7);
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SavedRegs.reset(BPF::R8);
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SavedRegs.reset(BPF::R9);
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}
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