[llvm-commits] [llvm] r166382 - /llvm/trunk/utils/TableGen/CodeGenInstruction.cpp

[Lang Hames]

Author: lhames
Date: Sat Oct 20 17:44:13 2012
New Revision: 166382

URL: http://llvm.org/viewvc/llvm-project?rev=166382&view=rev
Log:
Allow the commuted form of tied-operand constraints in tablegen ("$dst = $src",
rather than "$src = $dst").

Modified:
    llvm/trunk/utils/TableGen/CodeGenInstruction.cpp

Modified: llvm/trunk/utils/TableGen/CodeGenInstruction.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/utils/TableGen/CodeGenInstruction.cpp?rev=166382&r1=166381&r2=166382&view=diff
==============================================================================
--- llvm/trunk/utils/TableGen/CodeGenInstruction.cpp (original)
+++ llvm/trunk/utils/TableGen/CodeGenInstruction.cpp Sat Oct 20 17:44:13 2012
@@ -233,11 +233,12 @@
   if (wpos == std::string::npos)
     throw "Illegal format for tied-to constraint: '" + CStr + "'";
 
-  std::pair<unsigned,unsigned> SrcOp =
-  Ops.ParseOperandName(Name.substr(wpos), false);
-  if (SrcOp > DestOp)
-    throw "Illegal tied-to operand constraint '" + CStr + "'";
-
+  std::string SrcOpName = Name.substr(wpos);
+  std::pair<unsigned,unsigned> SrcOp = Ops.ParseOperandName(SrcOpName, false);
+  if (SrcOp > DestOp) {
+    std::swap(SrcOp, DestOp);
+    std::swap(SrcOpName, DestOpName);
+  }
 
   unsigned FlatOpNo = Ops.getFlattenedOperandNumber(SrcOp);