Today the front-ends (llvm-gcc and clang) generate multiple llvm.dbg.compile_units...

[oota-llvm.git] / lib / Analysis / ConstantFolding.cpp

diff --git a/lib/Analysis/ConstantFolding.cpp b/lib/Analysis/ConstantFolding.cpp
index 43597c85f16237ad35b4229c584eacd0d1b3ce3d..ea559c1010eac0927d1adb28a8e54889622c3bdd 100644 (file)
--- a/lib/Analysis/ConstantFolding.cpp
+++ b/lib/Analysis/ConstantFolding.cpp
@@ -87,7 +87,7 @@ static bool IsConstantOffsetFromGlobal(Constant *C, GlobalValue *&GV,
 
 
 /// SymbolicallyEvaluateBinop - One of Op0/Op1 is a constant expression.
-/// Attempt to symbolically evaluate the result of  a binary operator merging
+/// Attempt to symbolically evaluate the result of a binary operator merging
 /// these together.  If target data info is available, it is provided as TD, 
 /// otherwise TD is null.
 static Constant *SymbolicallyEvaluateBinop(unsigned Opc, Constant *Op0,
@@ -113,7 +113,6 @@ static Constant *SymbolicallyEvaluateBinop(unsigned Opc, Constant *Op0,
       }
   }
     
-  // TODO: Fold icmp setne/seteq as well.
   return 0;
 }
 
@@ -281,7 +280,7 @@ static Constant *FoldBitCast(Constant *C, const Type *DestTy,
 Constant *llvm::ConstantFoldInstruction(Instruction *I, const TargetData *TD) {
   if (PHINode *PN = dyn_cast<PHINode>(I)) {
     if (PN->getNumIncomingValues() == 0)
-      return Constant::getNullValue(PN->getType());
+      return UndefValue::get(PN->getType());
 
     Constant *Result = dyn_cast<Constant>(PN->getIncomingValue(0));
     if (Result == 0) return 0;
@@ -358,6 +357,8 @@ Constant *llvm::ConstantFoldInstOperands(unsigned Opcode, const Type *DestTy,
     return 0;
   case Instruction::ICmp:
   case Instruction::FCmp:
+  case Instruction::VICmp:
+  case Instruction::VFCmp:
     assert(0 &&"This function is invalid for compares: no predicate specified");
   case Instruction::PtrToInt:
     // If the input is a inttoptr, eliminate the pair.  This requires knowing
@@ -366,16 +367,31 @@ Constant *llvm::ConstantFoldInstOperands(unsigned Opcode, const Type *DestTy,
       if (TD && CE->getOpcode() == Instruction::IntToPtr) {
         Constant *Input = CE->getOperand(0);
         unsigned InWidth = Input->getType()->getPrimitiveSizeInBits();
-        Constant *Mask = 
-          ConstantInt::get(APInt::getLowBitsSet(InWidth,
-                                                TD->getPointerSizeInBits()));
-        Input = ConstantExpr::getAnd(Input, Mask);
+        if (TD->getPointerSizeInBits() < InWidth) {
+          Constant *Mask = 
+            ConstantInt::get(APInt::getLowBitsSet(InWidth,
+                                                  TD->getPointerSizeInBits()));
+          Input = ConstantExpr::getAnd(Input, Mask);
+        }
         // Do a zext or trunc to get to the dest size.
         return ConstantExpr::getIntegerCast(Input, DestTy, false);
       }
     }
     return ConstantExpr::getCast(Opcode, Ops[0], DestTy);
   case Instruction::IntToPtr:
+    // If the input is a ptrtoint, turn the pair into a ptr to ptr bitcast if
+    // the int size is >= the ptr size.  This requires knowing the width of a
+    // pointer, so it can't be done in ConstantExpr::getCast.
+    if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Ops[0])) {
+      if (TD && CE->getOpcode() == Instruction::PtrToInt &&
+          TD->getPointerSizeInBits() <=
+          CE->getType()->getPrimitiveSizeInBits()) {
+        Constant *Input = CE->getOperand(0);
+        Constant *C = FoldBitCast(Input, DestTy, *TD);
+        return C ? C : ConstantExpr::getBitCast(Input, DestTy);
+      }
+    }
+    return ConstantExpr::getCast(Opcode, Ops[0], DestTy);
   case Instruction::Trunc:
   case Instruction::ZExt:
   case Instruction::SExt:
@@ -473,7 +489,7 @@ Constant *llvm::ConstantFoldCompareInstOperands(unsigned Predicate,
       }
     }
   }
-  return ConstantExpr::getCompare(Predicate, Ops[0], Ops[1]); 
+  return ConstantExpr::getCompare(Predicate, Ops[0], Ops[1]);
 }