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7271ac2c03
SystemZ wants normal register scavenging slots, as close to the stack or frame pointer as possible. The only reason it was using custom code was because PrologEpilogInserter assumed an x86-like layout, where the frame pointer is at the opposite end of the frame from the stack pointer. This meant that when frame pointer elimination was disabled, the slots ended up being as close as possible to the incoming stack pointer, which is the opposite of what we want on SystemZ. This patch adds a new knob to say which layout is used and converts SystemZ to use target-independent scavenging slots. It's one of the pieces needed to support frame-to-frame MVCs, where two slots might be required. The ABI requires us to allocate 160 bytes for calls, so one approach would be to use that area as temporary spill space instead. It would need some surgery to make sure that the slot isn't live across a call though. I stuck to the "isFPCloseToIncomingSP - ..." style comment on the "do what the surrounding code does" principle. The FP case is already covered by several Systemz/frame-* tests, which fail without the PrologueEpilogueInserter change, so no new ones are needed. No behavioural change intended. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185696 91177308-0d34-0410-b5e6-96231b3b80d8
79 lines
3.0 KiB
C++
79 lines
3.0 KiB
C++
//===-- SystemZFrameLowering.h - Frame lowering for SystemZ -----*- 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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#ifndef SYSTEMZFRAMELOWERING_H
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#define SYSTEMZFRAMELOWERING_H
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#include "SystemZSubtarget.h"
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#include "llvm/ADT/IndexedMap.h"
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#include "llvm/Target/TargetFrameLowering.h"
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namespace llvm {
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class SystemZTargetMachine;
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class SystemZSubtarget;
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class SystemZFrameLowering : public TargetFrameLowering {
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IndexedMap<unsigned> RegSpillOffsets;
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protected:
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const SystemZTargetMachine &TM;
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const SystemZSubtarget &STI;
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public:
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SystemZFrameLowering(const SystemZTargetMachine &tm,
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const SystemZSubtarget &sti);
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// Override TargetFrameLowering.
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virtual bool isFPCloseToIncomingSP() const LLVM_OVERRIDE { return false; }
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virtual const SpillSlot *getCalleeSavedSpillSlots(unsigned &NumEntries) const
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LLVM_OVERRIDE;
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virtual void
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processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
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RegScavenger *RS) const LLVM_OVERRIDE;
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virtual bool
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spillCalleeSavedRegisters(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MBBI,
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const std::vector<CalleeSavedInfo> &CSI,
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const TargetRegisterInfo *TRI) const
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LLVM_OVERRIDE;
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virtual bool
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restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MBBII,
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const std::vector<CalleeSavedInfo> &CSI,
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const TargetRegisterInfo *TRI) const
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LLVM_OVERRIDE;
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virtual void processFunctionBeforeFrameFinalized(MachineFunction &MF,
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RegScavenger *RS) const;
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virtual void emitPrologue(MachineFunction &MF) const LLVM_OVERRIDE;
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virtual void emitEpilogue(MachineFunction &MF,
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MachineBasicBlock &MBB) const LLVM_OVERRIDE;
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virtual bool hasFP(const MachineFunction &MF) const LLVM_OVERRIDE;
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virtual int getFrameIndexOffset(const MachineFunction &MF,
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int FI) const LLVM_OVERRIDE;
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virtual bool hasReservedCallFrame(const MachineFunction &MF) const
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LLVM_OVERRIDE;
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virtual void
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eliminateCallFramePseudoInstr(MachineFunction &MF,
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MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MI) const
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LLVM_OVERRIDE;
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// Return the number of bytes in the callee-allocated part of the frame.
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uint64_t getAllocatedStackSize(const MachineFunction &MF) const;
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// Return the byte offset from the incoming stack pointer of Reg's
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// ABI-defined save slot. Return 0 if no slot is defined for Reg.
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unsigned getRegSpillOffset(unsigned Reg) const {
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return RegSpillOffsets[Reg];
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}
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};
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} // end namespace llvm
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#endif
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