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Simplify and document the new interface

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11524 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-02-17 05:54:26 +00:00
parent 0f9c491abc
commit 8026a6982e
1 changed files with 8 additions and 7 deletions
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15
include/llvm/Target/MRegisterInfo.h
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@ -242,16 +242,17 @@ public:
const TargetRegisterClass *RC) const = 0;
virtual bool canFoldMemoryOperand(MachineInstr* MI, unsigned i) const {
/// foldMemoryOperand - If this target supports it, fold a load or store of
/// the specified stack slot into the specified machine instruction for the
/// specified operand. If this is possible, the target should perform the
/// folding and return true, otherwise it should return false. If it folds
/// the instruction, it is likely that the MachineInstruction the iterator
/// references has been changed.
virtual bool foldMemoryOperand(MachineBasicBlock::iterator &MI,
unsigned OpNum, int FrameIndex) const {
return false;
}
virtual int foldMemoryOperand(MachineInstr* MI,
unsigned i,
int FrameIndex) const {
return 0;
}
/// getCallFrameSetup/DestroyOpcode - These methods return the opcode of the
/// frame setup/destroy instructions if they exist (-1 otherwise). Some
/// targets use pseudo instructions in order to abstract away the difference