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a36268215f
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 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@242165 91177308-0d34-0410-b5e6-96231b3b80d8
61 lines
2.0 KiB
C++
61 lines
2.0 KiB
C++
//===-- SparcFrameLowering.h - Define frame lowering for Sparc --*- C++ -*-===//
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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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//
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_SPARC_SPARCFRAMELOWERING_H
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#define LLVM_LIB_TARGET_SPARC_SPARCFRAMELOWERING_H
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#include "Sparc.h"
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#include "llvm/Target/TargetFrameLowering.h"
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namespace llvm {
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class SparcSubtarget;
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class SparcFrameLowering : public TargetFrameLowering {
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public:
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explicit SparcFrameLowering(const SparcSubtarget &ST);
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/// emitProlog/emitEpilog - These methods insert prolog and epilog code into
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/// the function.
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void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
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void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
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void
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eliminateCallFramePseudoInstr(MachineFunction &MF,
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MachineBasicBlock &MBB,
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MachineBasicBlock::iterator I) const override;
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bool hasReservedCallFrame(const MachineFunction &MF) const override;
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bool hasFP(const MachineFunction &MF) const override;
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void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
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RegScavenger *RS = nullptr) const override;
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private:
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// Remap input registers to output registers for leaf procedure.
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void remapRegsForLeafProc(MachineFunction &MF) const;
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// Returns true if MF is a leaf procedure.
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bool isLeafProc(MachineFunction &MF) const;
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// Emits code for adjusting SP in function prologue/epilogue.
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void emitSPAdjustment(MachineFunction &MF,
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MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MBBI,
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int NumBytes, unsigned ADDrr, unsigned ADDri) const;
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};
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} // End llvm namespace
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#endif
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