d20c54cbdb
When using `llvm.returnaddress` intrinsic, special handling is required for the spill of the `RA` register. Otherwise it will cause the verifier fail in some cases (e.g. pr17377.c of the GCC C Torture Suite). Specifically: ``` *** Bad machine code: Using an undefined physical register *** - function: f - basic block: %bb.0 entry (0xd94d18) - instruction: ST_D killed $r1, $r22, -40 :: (store (s64) into %stack.2) - operand 0: killed $r1 ``` Reviewed By: SixWeining Differential Revision: https://reviews.llvm.org/D137387
66 lines
2.7 KiB
C++
66 lines
2.7 KiB
C++
//=- LoongArchFrameLowering.h - TargetFrameLowering for LoongArch -*- C++ -*--//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This class implements LoongArch-specific bits of TargetFrameLowering class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_LOONGARCH_LOONGARCHFRAMELOWERING_H
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#define LLVM_LIB_TARGET_LOONGARCH_LOONGARCHFRAMELOWERING_H
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#include "llvm/CodeGen/TargetFrameLowering.h"
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namespace llvm {
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class LoongArchSubtarget;
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class LoongArchFrameLowering : public TargetFrameLowering {
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const LoongArchSubtarget &STI;
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public:
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explicit LoongArchFrameLowering(const LoongArchSubtarget &STI)
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: TargetFrameLowering(StackGrowsDown,
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/*StackAlignment=*/Align(16),
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/*LocalAreaOffset=*/0),
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STI(STI) {}
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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 determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
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RegScavenger *RS) const override;
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void processFunctionBeforeFrameFinalized(MachineFunction &MF,
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RegScavenger *RS) const override;
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bool hasReservedCallFrame(const MachineFunction &MF) const override;
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MachineBasicBlock::iterator
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eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MI) const override;
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bool spillCalleeSavedRegisters(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MI,
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ArrayRef<CalleeSavedInfo> CSI,
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const TargetRegisterInfo *TRI) const override;
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StackOffset getFrameIndexReference(const MachineFunction &MF, int FI,
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Register &FrameReg) const override;
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bool hasFP(const MachineFunction &MF) const override;
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bool hasBP(const MachineFunction &MF) const;
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uint64_t getFirstSPAdjustAmount(const MachineFunction &MF,
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bool IsPrologue = false) const;
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private:
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void determineFrameLayout(MachineFunction &MF) const;
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void adjustReg(MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI,
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const DebugLoc &DL, Register DestReg, Register SrcReg,
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int64_t Val, MachineInstr::MIFlag Flag) const;
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};
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} // end namespace llvm
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#endif // LLVM_LIB_TARGET_LOONGARCH_LOONGARCHFRAMELOWERING_H
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