[llvm-commits] [llvm] r60405 - in /llvm/trunk: include/llvm/Value.h lib/VMCore/Value.cpp

[Chris Lattner]

Author: lattner
Date: Tue Dec  2 01:16:45 2008
New Revision: 60405

URL: http://llvm.org/viewvc/llvm-project?rev=60405&view=rev
Log:
add a little helper function that does PHI translation.

Modified:
    llvm/trunk/include/llvm/Value.h
    llvm/trunk/lib/VMCore/Value.cpp

Modified: llvm/trunk/include/llvm/Value.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/Value.h?rev=60405&r1=60404&r2=60405&view=diff

==============================================================================
--- llvm/trunk/include/llvm/Value.h (original)
+++ llvm/trunk/include/llvm/Value.h Tue Dec  2 01:16:45 2008
@@ -242,6 +242,17 @@
   const Value *getUnderlyingObject() const {
     return const_cast<Value*>(this)->getUnderlyingObject();
   }
+  
+  /// DoPHITranslation - If this value is a PHI node with CurBB as a its parent,
+  /// return the value in the PHI node corresponding to PredBB.  If not, return
+  /// ourself.  This is useful if you want to know the value something has in a
+  /// predecessor block.
+  Value *DoPHITranslation(const BasicBlock *CurBB, const BasicBlock *PredBB);
+
+  const Value *DoPHITranslation(const BasicBlock *CurBB,
+                                const BasicBlock *PredBB) const{
+    return const_cast<Value*>(this)->DoPHITranslation(CurBB, PredBB);
+  }
 };
 
 inline std::ostream &operator<<(std::ostream &OS, const Value &V) {

Modified: llvm/trunk/lib/VMCore/Value.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/VMCore/Value.cpp?rev=60405&r1=60404&r2=60405&view=diff

==============================================================================
--- llvm/trunk/lib/VMCore/Value.cpp (original)
+++ llvm/trunk/lib/VMCore/Value.cpp Tue Dec  2 01:16:45 2008
@@ -358,6 +358,19 @@
   return this;
 }
 
+/// DoPHITranslation - If this value is a PHI node with CurBB as a its parent,
+/// return the value in the PHI node corresponding to PredBB.  If not, return
+/// ourself.  This is useful if you want to know the value something has in a
+/// predecessor block.
+Value *Value::DoPHITranslation(const BasicBlock *CurBB, 
+                               const BasicBlock *PredBB) {
+  PHINode *PN = dyn_cast<PHINode>(this);
+  if (PN && PN->getParent() == CurBB)
+    return PN->getIncomingValueForBlock(PredBB);
+  return this;
+}
+
+
 //===----------------------------------------------------------------------===//
 //                                 User Class
 //===----------------------------------------------------------------------===//