Fix a fixme in CondPropagate.cpp by moving a PhiNode optimization into

BasicBlock's removePredecessor routine.  This requires shuffling around
the definition and implementation of hasContantValue from Utils.h,cpp into
Instructions.h,cpp


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22664 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 0 insertions, 34 deletions

diff --git a/lib/Transforms/Utils/Local.cpp b/lib/Transforms/Utils/Local.cpp
index 4ce9d8f11a..9744af3c60 100644
--- a/lib/Transforms/Utils/Local.cpp
+++ b/lib/Transforms/Utils/Local.cpp
@@ -406,37 +406,3 @@ bool llvm::dceInstruction(BasicBlock::iterator &BBI) {
   }
   return false;
 }
-
-//===----------------------------------------------------------------------===//
-//  PHI Instruction Simplification
-//
-
-/// hasConstantValue - If the specified PHI node always merges together the same
-/// value, return the value, otherwise return null.
-///
-Value *llvm::hasConstantValue(PHINode *PN) {
-  // If the PHI node only has one incoming value, eliminate the PHI node...
-  if (PN->getNumIncomingValues() == 1)
-    return PN->getIncomingValue(0);
-
-  // Otherwise if all of the incoming values are the same for the PHI, replace
-  // the PHI node with the incoming value.
-  //
-  Value *InVal = 0;
-  for (unsigned i = 0, e = PN->getNumIncomingValues(); i != e; ++i)
-    if (PN->getIncomingValue(i) != PN &&  // Not the PHI node itself...
-        !isa<UndefValue>(PN->getIncomingValue(i)))
-      if (InVal && PN->getIncomingValue(i) != InVal)
-        return 0;  // Not the same, bail out.
-      else
-        InVal = PN->getIncomingValue(i);
-
-  // The only case that could cause InVal to be null is if we have a PHI node
-  // that only has entries for itself.  In this case, there is no entry into the
-  // loop, so kill the PHI.
-  //
-  if (InVal == 0) InVal = UndefValue::get(PN->getType());
-
-  // All of the incoming values are the same, return the value now.
-  return InVal;
-}