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f864a32c13
This will become necessary in a subsequent change to make this method merge adjacent stack adjustments, i.e. it might erase the previous and/or next instruction. It also greatly simplifies the calls to this function from Prolog- EpilogInserter. Previously, that had a bunch of logic to resume iteration after the call; now it just continues with the returned iterator. Note that this changes the behaviour of PEI a little. Previously, it attempted to re-visit the new instruction created by eliminateCallFramePseudoInstr(). That code was added in r36625, but I can't see any reason for it: the new instructions will obviously not be pseudo instructions, they will not have FrameIndex operands, and we have already accounted for the stack adjustment. Differential Revision: http://reviews.llvm.org/D18627 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@265036 91177308-0d34-0410-b5e6-96231b3b80d8
64 lines
2.3 KiB
C++
64 lines
2.3 KiB
C++
//===-- XCoreFrameLowering.h - Frame info for XCore Target ------*- 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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// This file contains XCore frame information that doesn't fit anywhere else
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// cleanly...
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_XCORE_XCOREFRAMELOWERING_H
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#define LLVM_LIB_TARGET_XCORE_XCOREFRAMELOWERING_H
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#include "llvm/Target/TargetFrameLowering.h"
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#include "llvm/Target/TargetMachine.h"
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namespace llvm {
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class XCoreSubtarget;
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class XCoreFrameLowering: public TargetFrameLowering {
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public:
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XCoreFrameLowering(const XCoreSubtarget &STI);
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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,
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MachineBasicBlock &MBB) const override;
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void emitEpilogue(MachineFunction &MF,
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MachineBasicBlock &MBB) const override;
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bool spillCalleeSavedRegisters(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MI,
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const std::vector<CalleeSavedInfo> &CSI,
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const TargetRegisterInfo *TRI) const override;
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bool restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MI,
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const std::vector<CalleeSavedInfo> &CSI,
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const TargetRegisterInfo *TRI) const override;
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MachineBasicBlock::iterator
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eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
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MachineBasicBlock::iterator I) 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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void processFunctionBeforeFrameFinalized(MachineFunction &MF,
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RegScavenger *RS = nullptr) const override;
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//! Stack slot size (4 bytes)
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static int stackSlotSize() {
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return 4;
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}
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};
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}
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#endif
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