Emit BRCONDTWOWAY when possible.
authorChris Lattner <sabre@nondot.org>
Sat, 9 Apr 2005 03:30:29 +0000 (03:30 +0000)
committerChris Lattner <sabre@nondot.org>
Sat, 9 Apr 2005 03:30:29 +0000 (03:30 +0000)
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21167 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp

index 7c347d0526a62bdc3ed62d545840d4631df3ec84..bfceecb7aafce690526764cb31c339374ba0647b 100644 (file)
@@ -430,7 +430,6 @@ void SelectionDAGLowering::visitBr(BranchInst &I) {
     MachineBasicBlock *Succ1MBB = FuncInfo.MBBMap[I.getSuccessor(1)];
 
     SDOperand Cond = getValue(I.getCondition());
-
     if (Succ1MBB == NextBlock) {
       // If the condition is false, fall through.  This means we should branch
       // if the condition is true to Succ #0.
@@ -444,12 +443,12 @@ void SelectionDAGLowering::visitBr(BranchInst &I) {
       DAG.setRoot(DAG.getNode(ISD::BRCOND, MVT::Other, getRoot(),
                              Cond, DAG.getBasicBlock(Succ1MBB)));
     } else {
-      // Neither edge is a fall through.  If the comparison is true, jump to
-      // Succ#0, otherwise branch unconditionally to succ #1.
-      DAG.setRoot(DAG.getNode(ISD::BRCOND, MVT::Other, getRoot(),
-                             Cond, DAG.getBasicBlock(Succ0MBB)));
-      DAG.setRoot(DAG.getNode(ISD::BR, MVT::Other, getRoot(),
-                             DAG.getBasicBlock(Succ1MBB)));
+      std::vector<SDOperand> Ops;
+      Ops.push_back(getRoot());
+      Ops.push_back(Cond);
+      Ops.push_back(DAG.getBasicBlock(Succ0MBB));
+      Ops.push_back(DAG.getBasicBlock(Succ1MBB));
+      DAG.setRoot(DAG.getNode(ISD::BRCONDTWOWAY, MVT::Other, Ops));
     }
   }
 }