diff options
Diffstat (limited to 'contrib/llvm/lib/Target/X86/X86FrameLowering.h')
| -rw-r--r-- | contrib/llvm/lib/Target/X86/X86FrameLowering.h | 39 |
1 files changed, 32 insertions, 7 deletions
diff --git a/contrib/llvm/lib/Target/X86/X86FrameLowering.h b/contrib/llvm/lib/Target/X86/X86FrameLowering.h index 448a365..5d03b4d 100644 --- a/contrib/llvm/lib/Target/X86/X86FrameLowering.h +++ b/contrib/llvm/lib/Target/X86/X86FrameLowering.h @@ -18,10 +18,6 @@ namespace llvm { -class MCSymbol; -class X86TargetMachine; -class X86Subtarget; - class X86FrameLowering : public TargetFrameLowering { public: explicit X86FrameLowering(StackDirection D, unsigned StackAl, int LAO) @@ -39,12 +35,14 @@ public: /// emitProlog/emitEpilog - These methods insert prolog and epilog code into /// the function. - void emitPrologue(MachineFunction &MF) const override; + void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override; void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override; - void adjustForSegmentedStacks(MachineFunction &MF) const override; + void adjustForSegmentedStacks(MachineFunction &MF, + MachineBasicBlock &PrologueMBB) const override; - void adjustForHiPEPrologue(MachineFunction &MF) const override; + void adjustForHiPEPrologue(MachineFunction &MF, + MachineBasicBlock &PrologueMBB) const override; void processFunctionBeforeCalleeSavedScan(MachineFunction &MF, RegScavenger *RS = nullptr) const override; @@ -81,6 +79,33 @@ public: MachineBasicBlock &MBB, MachineBasicBlock::iterator MI) const override; + /// Check the instruction before/after the passed instruction. If + /// it is an ADD/SUB/LEA instruction it is deleted argument and the + /// stack adjustment is returned as a positive value for ADD/LEA and + /// a negative for SUB. + static int mergeSPUpdates(MachineBasicBlock &MBB, + MachineBasicBlock::iterator &MBBI, + unsigned StackPtr, bool doMergeWithPrevious); + + /// Emit a series of instructions to increment / decrement the stack + /// pointer by a constant value. + static void emitSPUpdate(MachineBasicBlock &MBB, + MachineBasicBlock::iterator &MBBI, unsigned StackPtr, + int64_t NumBytes, bool Is64BitTarget, + bool Is64BitStackPtr, bool UseLEA, + const TargetInstrInfo &TII, + const TargetRegisterInfo &TRI); + + /// Check that LEA can be used on SP in an epilogue sequence for \p MF. + bool canUseLEAForSPInEpilogue(const MachineFunction &MF) const; + + /// Check whether or not the given \p MBB can be used as a epilogue + /// for the target. + /// The epilogue will be inserted before the first terminator of that block. + /// This method is used by the shrink-wrapping pass to decide if + /// \p MBB will be correctly handled by the target. + bool canUseAsEpilogue(const MachineBasicBlock &MBB) const override; + private: /// convertArgMovsToPushes - This method tries to convert a call sequence /// that uses sub and mov instructions to put the argument onto the stack |
