From: Andrew Lenharth <andrewl@lenharth.org>
Date: Tue, 7 Oct 2008 18:27:23 +0000 (+0000)
Subject: Use Dan's supperior check
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=2163ca11d576059883d1c289e5c4d8163d123270;p=oota-llvm.git

Use Dan's supperior check

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57255 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
index d4d13c33bb3..8874eb872f6 100644
--- a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
@@ -6441,22 +6441,18 @@ void SelectionDAGLegalize::ExpandOp(SDValue Op, SDValue &Lo, SDValue &Hi){
     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);