Simplify IntrinsicLowering and clarify that it is only for use by the

[oota-llvm.git] / lib / Target / TargetInstrInfo.cpp

diff --git a/lib/Target/TargetInstrInfo.cpp b/lib/Target/TargetInstrInfo.cpp
index 6377de88655ba0eccafcc4d01d560d4770277b97..d28f1e7c50531ac8985a6bd889e4e598281053ad 100644 (file)
--- a/lib/Target/TargetInstrInfo.cpp
+++ b/lib/Target/TargetInstrInfo.cpp
@@ -38,6 +38,20 @@ TargetInstrInfo::~TargetInstrInfo() {
   TargetInstrDescriptors = NULL; // reset global variable
 }
 
+/// findTiedToSrcOperand - Returns the operand that is tied to the specified
+/// dest operand. Returns -1 if there isn't one.
+int
+TargetInstrInfo::findTiedToSrcOperand(MachineOpCode Opc, unsigned OpNum) const {
+  for (unsigned i = 0, e = getNumOperands(Opc); i != e; ++i) {
+    if (i == OpNum)
+      continue;
+    int ti = getOperandConstraint(Opc, i, TIED_TO);
+    if (ti == (int)OpNum)
+      return i;
+  }
+  return -1;
+}
+
 
 // commuteInstruction - The default implementation of this method just exchanges
 // operand 1 and 2.
@@ -45,7 +59,7 @@ MachineInstr *TargetInstrInfo::commuteInstruction(MachineInstr *MI) const {
   assert(MI->getOperand(1).isRegister() && MI->getOperand(2).isRegister() &&
          "This only knows how to commute register operands so far");
   unsigned Reg1 = MI->getOperand(1).getReg();
-  unsigned Reg2 = MI->getOperand(1).getReg();
+  unsigned Reg2 = MI->getOperand(2).getReg();
   MI->getOperand(2).setReg(Reg1);
   MI->getOperand(1).setReg(Reg2);
   return MI;