From: Chris Lattner <sabre@nondot.org>
Date: Fri, 7 Jan 2005 22:49:57 +0000 (+0000)
Subject: Fold conditional branches on constants away.
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=5351e9b172962a4f51e6d3b12018dd2de34b2f97;p=oota-llvm.git

Fold conditional branches on constants away.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19360 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index 6ab1d459575..e917350f8c9 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -727,6 +727,12 @@ SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT,
     }
 
     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);