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Added canFoldMemoryOperand for PPC.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44623 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2007-12-05 18:41:29 +00:00
parent 7db2811f6e
commit 8c24e74b02
2 changed files with 23 additions and 0 deletions
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20
lib/Target/PowerPC/PPCRegisterInfo.cpp
View File

@ -613,6 +613,26 @@ MachineInstr *PPCRegisterInfo::foldMemoryOperand(MachineInstr *MI,
return NewMI;
}
bool PPCRegisterInfo::canFoldMemoryOperand(MachineInstr *MI,
SmallVectorImpl<unsigned> &Ops) const {
if (Ops.size() != 1) return NULL;
// Make sure this is a reg-reg copy. Note that we can't handle MCRF, because
// it takes more than one instruction to store it.
unsigned Opc = MI->getOpcode();
if ((Opc == PPC::OR &&
MI->getOperand(1).getReg() == MI->getOperand(2).getReg()))
return true;
else if ((Opc == PPC::OR8 &&
MI->getOperand(1).getReg() == MI->getOperand(2).getReg()))
return true;
else if (Opc == PPC::FMRD || Opc == PPC::FMRS)
return true;
return false;
}
//===----------------------------------------------------------------------===//
// Stack Frame Processing methods
//===----------------------------------------------------------------------===//

3
lib/Target/PowerPC/PPCRegisterInfo.h
View File

@ -75,6 +75,9 @@ public:
return 0;
}
virtual bool canFoldMemoryOperand(MachineInstr *MI,
SmallVectorImpl<unsigned> &Ops) const;
const unsigned *getCalleeSavedRegs(const MachineFunction* MF = 0) const;
const TargetRegisterClass* const*