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Add a new method, described in the comment.
llvm-svn: 19683
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@ -177,6 +177,18 @@ public:
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return 0;
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return 0;
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}
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}
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/// commuteInstruction - If a target has any instructions that are commutable,
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/// but require converting to a different instruction or making non-trivial
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/// changes to commute them, this method can overloaded to do this. The
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/// default implementation of this method simply swaps the first two operands
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/// of MI and returns it.
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///
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/// If a target wants to make more aggressive changes, they can construct and
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/// return a new machine instruction. If an instruction cannot commute, it
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/// can also return null.
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///
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virtual MachineInstr *commuteInstruction(MachineInstr *MI) const;
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/// Insert a goto (unconditional branch) sequence to TMBB, at the
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/// Insert a goto (unconditional branch) sequence to TMBB, at the
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/// end of MBB
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/// end of MBB
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virtual void insertGoto(MachineBasicBlock& MBB,
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virtual void insertGoto(MachineBasicBlock& MBB,
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