add the start of a class used to handle phi translation in memdep and

[oota-llvm.git] / include / llvm / Analysis / InstructionSimplify.h

diff --git a/include/llvm/Analysis/InstructionSimplify.h b/include/llvm/Analysis/InstructionSimplify.h
index 2398cf694fa831ef24f39f275686415b07fff7d4..13314e6ea0e5e129b38a19882bf880e3bc2c5bdd 100644 (file)
--- a/include/llvm/Analysis/InstructionSimplify.h
+++ b/include/llvm/Analysis/InstructionSimplify.h
@@ -17,9 +17,14 @@
 #define LLVM_ANALYSIS_INSTRUCTIONSIMPLIFY_H
 
 namespace llvm {
+  class Instruction;
   class Value;
   class TargetData;
-  
+
+  /// SimplifyAddInst - Given operands for an Add, see if we can
+  /// fold the result.  If not, this returns null.
+  Value *SimplifyAddInst(Value *LHS, Value *RHS, bool isNSW, bool isNUW,
+                         const TargetData *TD = 0);
   
   /// SimplifyAndInst - Given operands for an And, see if we can
   /// fold the result.  If not, this returns null.
@@ -42,6 +47,11 @@ namespace llvm {
                           const TargetData *TD = 0);
   
 
+  /// SimplifyGEPInst - Given operands for an GetElementPtrInst, see if we can
+  /// fold the result.  If not, this returns null.
+  Value *SimplifyGEPInst(Value * const *Ops, unsigned NumOps,
+                         const TargetData *TD = 0);
+  
   //=== Helper functions for higher up the class hierarchy.
   
   
@@ -55,6 +65,19 @@ namespace llvm {
   Value *SimplifyBinOp(unsigned Opcode, Value *LHS, Value *RHS, 
                        const TargetData *TD = 0);
   
+  /// SimplifyInstruction - See if we can compute a simplified version of this
+  /// instruction.  If not, this returns null.
+  Value *SimplifyInstruction(Instruction *I, const TargetData *TD = 0);
+  
+  
+  /// ReplaceAndSimplifyAllUses - Perform From->replaceAllUsesWith(To) and then
+  /// delete the From instruction.  In addition to a basic RAUW, this does a
+  /// recursive simplification of the updated instructions.  This catches
+  /// things where one simplification exposes other opportunities.  This only
+  /// simplifies and deletes scalar operations, it does not change the CFG.
+  ///
+  void ReplaceAndSimplifyAllUses(Instruction *From, Value *To,
+                                 const TargetData *TD = 0);
 } // end namespace llvm
 
 #endif