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Add Target hook to duplicate machine instructions.

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Some instructions refer to unique labels, and so cannot be trivially cloned
with CloneMachineInstr.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92873 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2010-01-06 23:47:07 +00:00
parent ce3e769c15
commit 30ac0467ce
6 changed files with 151 additions and 22 deletions
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8
include/llvm/Target/TargetInstrInfo.h
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@@ -232,6 +232,12 @@ public:
const MachineInstr *Orig,
const TargetRegisterInfo *TRI) const = 0;
/// duplicate - Create a duplicate of the Orig instruction in MF. This is like
/// MachineFunction::CloneMachineInstr(), but the target may update operands
/// that are required to be unique.
virtual MachineInstr *duplicate(MachineInstr *Orig,
MachineFunction &MF) const = 0;
/// convertToThreeAddress - This method must be implemented by targets that
/// set the M_CONVERTIBLE_TO_3_ADDR flag. When this flag is set, the target
/// may be able to convert a two-address instruction into one or more true
@@ -560,6 +566,8 @@ public:
unsigned DestReg, unsigned SubReg,
const MachineInstr *Orig,
const TargetRegisterInfo *TRI) const;
virtual MachineInstr *duplicate(MachineInstr *Orig,
MachineFunction &MF) const;
virtual bool isIdentical(const MachineInstr *MI,
const MachineInstr *Other,
const MachineRegisterInfo *MRI) const;