It is illegal for PHI nodes to have zero values, delete the code to handle them

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4071 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp
index f0e639742dc2a97dc71ff9da1a133b2fa304a2ac..74a1496bfac1ab5db53a141229af6638daa012bb 100644 (file)
--- a/lib/Transforms/Scalar/InstructionCombining.cpp
+++ b/lib/Transforms/Scalar/InstructionCombining.cpp
@@ -630,8 +630,6 @@ Instruction *InstCombiner::visitCastInst(CastInst &CI) {
 //
 Instruction *InstCombiner::visitPHINode(PHINode &PN) {
   // If the PHI node only has one incoming value, eliminate the PHI node...
-  if (PN.getNumIncomingValues() == 0)
-    return ReplaceInstUsesWith(PN, Constant::getNullValue(PN.getType()));
   if (PN.getNumIncomingValues() == 1)
     return ReplaceInstUsesWith(PN, PN.getIncomingValue(0));