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Simplify and document the new interface
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11524 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -242,16 +242,17 @@ public:
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const TargetRegisterClass *RC) const = 0;
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virtual bool canFoldMemoryOperand(MachineInstr* MI, unsigned i) const {
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/// foldMemoryOperand - If this target supports it, fold a load or store of
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/// the specified stack slot into the specified machine instruction for the
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/// specified operand. If this is possible, the target should perform the
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/// folding and return true, otherwise it should return false. If it folds
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/// the instruction, it is likely that the MachineInstruction the iterator
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/// references has been changed.
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virtual bool foldMemoryOperand(MachineBasicBlock::iterator &MI,
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unsigned OpNum, int FrameIndex) const {
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return false;
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}
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virtual int foldMemoryOperand(MachineInstr* MI,
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unsigned i,
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int FrameIndex) const {
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return 0;
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}
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/// getCallFrameSetup/DestroyOpcode - These methods return the opcode of the
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/// frame setup/destroy instructions if they exist (-1 otherwise). Some
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/// targets use pseudo instructions in order to abstract away the difference
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