commit 5c66e45b9218fc9abbcbffcc81a8f04365ae4d50
author Chris Lattner <sabre@nondot.org> Fri Jan 07 22:49:57 2005 +0000
committer Chris Lattner <sabre@nondot.org> Fri Jan 07 22:49:57 2005 +0000
tree 1c4aa360d480ee9496b2d6b071c5b9747adac471
parent cda3efa6e514d2ae499617c506723d082f5cd7b0

Fold conditional branches on constants away.

llvm-svn: 19360

llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp

diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index 6ab1d45..e917350 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -727,6 +727,12 @@
     }
 
     break;
+  case ISD::BRCOND:
+    if (N2C)
+      if (N2C->getValue()) // Unconditional branch
+        return getNode(ISD::BR, MVT::Other, N1, N3);
+      else
+        return N1;         // Never-taken branch
   }
 
   SDNode *N = new SDNode(Opcode, N1, N2, N3);