Added canFoldMemoryOperand for PPC.

llvm-svn: 44623

2 files changed, 23 insertions, 0 deletions

diff --git a/llvm/lib/Target/PowerPC/PPCRegisterInfo.cpp b/llvm/lib/Target/PowerPC/PPCRegisterInfo.cpp
index dec49bd16a7..634681cdb4e 100644
--- a/llvm/lib/Target/PowerPC/PPCRegisterInfo.cpp
+++ b/llvm/lib/Target/PowerPC/PPCRegisterInfo.cpp
@@ -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
 //===----------------------------------------------------------------------===//
diff --git a/llvm/lib/Target/PowerPC/PPCRegisterInfo.h b/llvm/lib/Target/PowerPC/PPCRegisterInfo.h
index 687af569717..2106c6e667b 100644
--- a/llvm/lib/Target/PowerPC/PPCRegisterInfo.h
+++ b/llvm/lib/Target/PowerPC/PPCRegisterInfo.h
@@ -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*