[llvm-commits] [llvm] r44623 - in /llvm/trunk/lib/Target/PowerPC: PPCRegisterInfo.cpp PPCRegisterInfo.h

[Evan Cheng]

Author: evancheng
Date: Wed Dec  5 12:41:29 2007
New Revision: 44623

URL: http://llvm.org/viewvc/llvm-project?rev=44623&view=rev
Log:
Added canFoldMemoryOperand for PPC.

Modified:
    llvm/trunk/lib/Target/PowerPC/PPCRegisterInfo.cpp
    llvm/trunk/lib/Target/PowerPC/PPCRegisterInfo.h

Modified: llvm/trunk/lib/Target/PowerPC/PPCRegisterInfo.cpp
URL: 
http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/PowerPC/PPCRegisterInfo.cpp?rev=44623&r1=44622&r2=44623&view=diff

==============================================================================
--- llvm/trunk/lib/Target/PowerPC/PPCRegisterInfo.cpp (original)
+++ llvm/trunk/lib/Target/PowerPC/PPCRegisterInfo.cpp Wed Dec  5 12:41:29 2007
@@ -613,6 +613,26 @@
   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
 
//===----------------------------------------------------------------------===//

Modified: llvm/trunk/lib/Target/PowerPC/PPCRegisterInfo.h
URL: 
http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/PowerPC/PPCRegisterInfo.h?rev=44623&r1=44622&r2=44623&view=diff

==============================================================================
--- llvm/trunk/lib/Target/PowerPC/PPCRegisterInfo.h (original)
+++ llvm/trunk/lib/Target/PowerPC/PPCRegisterInfo.h Wed Dec  5 12:41:29 2007
@@ -75,6 +75,9 @@
     return 0;
   }
 
+  virtual bool canFoldMemoryOperand(MachineInstr *MI,
+                                    SmallVectorImpl<unsigned> &Ops) const;
+
   const unsigned *getCalleeSavedRegs(const MachineFunction* MF = 0) const;
 
   const TargetRegisterClass* const*


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