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60c91c28e4
With this patch the x86 backend is now shrink-wrapping capable and this functionality can be tested by using the -enable-shrink-wrap switch. The next step is to make more test and enable shrink-wrapping by default for x86. Related to <rdar://problem/20821487> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@238293 91177308-0d34-0410-b5e6-96231b3b80d8
123 lines
5.5 KiB
C++
123 lines
5.5 KiB
C++
//===-- X86TargetFrameLowering.h - Define frame lowering for X86 -*- 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 class implements X86-specific bits of TargetFrameLowering class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_X86_X86FRAMELOWERING_H
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#define LLVM_LIB_TARGET_X86_X86FRAMELOWERING_H
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#include "llvm/Target/TargetFrameLowering.h"
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namespace llvm {
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class X86FrameLowering : public TargetFrameLowering {
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public:
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explicit X86FrameLowering(StackDirection D, unsigned StackAl, int LAO)
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: TargetFrameLowering(StackGrowsDown, StackAl, LAO) {}
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/// Emit a call to the target's stack probe function. This is required for all
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/// large stack allocations on Windows. The caller is required to materialize
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/// the number of bytes to probe in RAX/EAX.
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static void emitStackProbeCall(MachineFunction &MF, MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MBBI, DebugLoc DL);
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void emitCalleeSavedFrameMoves(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MBBI,
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DebugLoc DL) const;
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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 adjustForSegmentedStacks(MachineFunction &MF,
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MachineBasicBlock &PrologueMBB) const override;
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void adjustForHiPEPrologue(MachineFunction &MF,
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MachineBasicBlock &PrologueMBB) const override;
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void processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
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RegScavenger *RS = nullptr) const override;
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bool
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assignCalleeSavedSpillSlots(MachineFunction &MF,
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const TargetRegisterInfo *TRI,
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std::vector<CalleeSavedInfo> &CSI) 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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bool hasFP(const MachineFunction &MF) const override;
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bool hasReservedCallFrame(const MachineFunction &MF) const override;
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bool canSimplifyCallFramePseudos(const MachineFunction &MF) const override;
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bool needsFrameIndexResolution(const MachineFunction &MF) const override;
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int getFrameIndexOffset(const MachineFunction &MF, int FI) const override;
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int getFrameIndexReference(const MachineFunction &MF, int FI,
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unsigned &FrameReg) const override;
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int getFrameIndexOffsetFromSP(const MachineFunction &MF, int FI) const;
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int getFrameIndexReferenceFromSP(const MachineFunction &MF, int FI,
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unsigned &FrameReg) const override;
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void eliminateCallFramePseudoInstr(MachineFunction &MF,
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MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MI) const override;
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/// Check the instruction before/after the passed instruction. If
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/// it is an ADD/SUB/LEA instruction it is deleted argument and the
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/// stack adjustment is returned as a positive value for ADD/LEA and
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/// a negative for SUB.
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static int mergeSPUpdates(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator &MBBI,
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unsigned StackPtr, bool doMergeWithPrevious);
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/// Emit a series of instructions to increment / decrement the stack
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/// pointer by a constant value.
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static void emitSPUpdate(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator &MBBI, unsigned StackPtr,
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int64_t NumBytes, bool Is64BitTarget,
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bool Is64BitStackPtr, bool UseLEA,
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const TargetInstrInfo &TII,
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const TargetRegisterInfo &TRI);
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/// Check that LEA can be used on SP in an epilogue sequence for \p MF.
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bool canUseLEAForSPInEpilogue(const MachineFunction &MF) const;
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/// Check whether or not the given \p MBB can be used as a epilogue
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/// for the target.
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/// The epilogue will be inserted before the first terminator of that block.
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/// This method is used by the shrink-wrapping pass to decide if
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/// \p MBB will be correctly handled by the target.
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bool canUseAsEpilogue(const MachineBasicBlock &MBB) const override;
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private:
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/// convertArgMovsToPushes - This method tries to convert a call sequence
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/// that uses sub and mov instructions to put the argument onto the stack
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/// into a series of pushes.
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/// Returns true if the transformation succeeded, false if not.
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bool convertArgMovsToPushes(MachineFunction &MF,
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MachineBasicBlock &MBB,
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MachineBasicBlock::iterator I,
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uint64_t Amount) const;
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};
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} // End llvm namespace
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#endif
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