[llvm-commits] [llvm] r57255 - /llvm/trunk/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp

[Andrew Lenharth]

Author: alenhar2
Date: Tue Oct  7 13:27:23 2008
New Revision: 57255

URL: http://llvm.org/viewvc/llvm-project?rev=57255&view=rev
Log:
Use Dan's supperior check

Modified:
    llvm/trunk/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp

Modified: llvm/trunk/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp?rev=57255&r1=57254&r2=57255&view=diff

==============================================================================
--- llvm/trunk/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp (original)
+++ llvm/trunk/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp Tue Oct  7 13:27:23 2008
@@ -6441,22 +6441,18 @@
     LoOps[1] = RHSL;
     HiOps[0] = LHSH;
     HiOps[1] = RHSH;
+
     //cascaded check to see if any smaller size has a a carry flag.
     unsigned OpV = Node->getOpcode() == ISD::ADD ? ISD::ADDC : ISD::SUBC;
     bool hasCarry = false;
-    if (NVT == MVT::i64)
-      hasCarry = TLI.isOperationLegal(OpV, MVT::i64)
-        | TLI.isOperationLegal(OpV, MVT::i32)
-        | TLI.isOperationLegal(OpV, MVT::i16)
-        | TLI.isOperationLegal(OpV, MVT::i8);
-    if (NVT == MVT::i32)
-      hasCarry = TLI.isOperationLegal(OpV, MVT::i32)
-        | TLI.isOperationLegal(OpV, MVT::i16)
-        | TLI.isOperationLegal(OpV, MVT::i8);
-    if (NVT == MVT::i16)
-      hasCarry = TLI.isOperationLegal(OpV, MVT::i16)
-        | TLI.isOperationLegal(OpV, MVT::i8);
-      
+    for (unsigned BitSize = NVT.getSizeInBits(); BitSize != 0; BitSize /= 2) {
+      MVT AVT = MVT::getIntegerVT(BitSize);
+      if (TLI.isOperationLegal(OpV, AVT)) {
+        hasCarry = true;
+        break;
+      }
+    }
+
     if(hasCarry) {
       if (Node->getOpcode() == ISD::ADD) {
         Lo = DAG.getNode(ISD::ADDC, VTList, LoOps, 2);