[llvm-commits] [llvm] r93251 - in /llvm/trunk: include/llvm/Transforms/Utils/Local.h lib/Transforms/Utils/Local.cpp

[Chris Lattner]

Author: lattner
Date: Tue Jan 12 13:40:54 2010
New Revision: 93251

URL: http://llvm.org/viewvc/llvm-project?rev=93251&view=rev
Log:
add a helper function.

Modified:
    llvm/trunk/include/llvm/Transforms/Utils/Local.h
    llvm/trunk/lib/Transforms/Utils/Local.cpp

Modified: llvm/trunk/include/llvm/Transforms/Utils/Local.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/Transforms/Utils/Local.h?rev=93251&r1=93250&r2=93251&view=diff

==============================================================================
--- llvm/trunk/include/llvm/Transforms/Utils/Local.h (original)
+++ llvm/trunk/include/llvm/Transforms/Utils/Local.h Tue Jan 12 13:40:54 2010
@@ -74,6 +74,14 @@
 /// too, recursively.  Return true if the PHI node is actually deleted.
 bool RecursivelyDeleteDeadPHINode(PHINode *PN);
 
+  
+/// SimplifyInstructionsInBlock - Scan the specified basic block and try to
+/// simplify any instructions in it and recursively delete dead instructions.
+///
+/// This returns true if it changed the code, note that it can delete
+/// instructions in other blocks as well in this block.
+bool SimplifyInstructionsInBlock(BasicBlock *BB, const TargetData *TD = 0);
+    
 //===----------------------------------------------------------------------===//
 //  Control Flow Graph Restructuring.
 //

Modified: llvm/trunk/lib/Transforms/Utils/Local.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Utils/Local.cpp?rev=93251&r1=93250&r2=93251&view=diff

==============================================================================
--- llvm/trunk/lib/Transforms/Utils/Local.cpp (original)
+++ llvm/trunk/lib/Transforms/Utils/Local.cpp Tue Jan 12 13:40:54 2010
@@ -335,6 +335,30 @@
   return Changed;
 }
 
+/// SimplifyInstructionsInBlock - Scan the specified basic block and try to
+/// simplify any instructions in it and recursively delete dead instructions.
+///
+/// This returns true if it changed the code, note that it can delete
+/// instructions in other blocks as well in this block.
+bool llvm::SimplifyInstructionsInBlock(BasicBlock *BB, const TargetData *TD) {
+  bool MadeChange = false;
+  for (BasicBlock::iterator BI = BB->begin(), E = BB->end(); BI != E; ) {
+    Instruction *Inst = BI++;
+    
+    if (Value *V = SimplifyInstruction(Inst, TD)) {
+      WeakVH BIHandle(BI);
+      ReplaceAndSimplifyAllUses(Inst, V, TD);
+      MadeChange = true;
+      if (BIHandle == 0)
+        BI = BB->begin();
+      continue;
+    }
+    
+    MadeChange |= RecursivelyDeleteTriviallyDeadInstructions(Inst);
+  }
+  return MadeChange;
+}
+
 //===----------------------------------------------------------------------===//
 //  Control Flow Graph Restructuring.
 //