Revert my last couple of patches. They appear to have broken bison.

llvm-svn: 94841

1 files changed, 10 insertions, 36 deletions

diff --git a/llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp b/llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp
index f06cd12ffce..47c37c46587 100644
--- a/llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp
@@ -633,42 +633,16 @@ Instruction *InstCombiner::visitCallInst(CallInst &CI) {
     break;
   }
   case Intrinsic::objectsize: {
-    const Type *ReturnTy = CI.getType();
-    Value *Op1 = II->getOperand(1);
-    
-    // If we're a constant expr then we just return the number of bytes
-    // left in whatever we're indexing.  Since it's constant there's no
-    // need for maximum or minimum bytes.
-    if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Op1)) {
-      // If this isn't a GEP give up.
-      if (CE->getOpcode() != Instruction::GetElementPtr) return 0;
-      
-      const PointerType *ObjTy = 
-        reinterpret_cast<const PointerType*>(CE->getOperand(0)->getType());
-
-      if (const ArrayType *AT = dyn_cast<ArrayType>(ObjTy->getElementType())) {
-        
-        // Deal with multi-dimensional arrays
-        const ArrayType *SAT = AT;
-        while ((AT = dyn_cast<ArrayType>(AT->getElementType())))
-          SAT = AT;
-        
-        size_t numElems = SAT->getNumElements();
-        // We return the remaining bytes, so grab the size of an element
-        // in bytes.
-        size_t sizeofElem = SAT->getElementType()->getPrimitiveSizeInBits() / 8;
-
-        ConstantInt *Const = 
-          cast<ConstantInt>(CE->getOperand(CE->getNumOperands() - 1));
-        size_t indx = Const->getZExtValue();
-        return ReplaceInstUsesWith(CI,
-                      ConstantInt::get(ReturnTy,
-                                       ((numElems - indx) * sizeofElem)));
-      }
-    }
-
-    // TODO: Add more Instruction types here.
-    
+    ConstantInt *Const = cast<ConstantInt>(II->getOperand(2));
+    const Type *Ty = CI.getType();
+
+    // 0 is maximum number of bytes left, 1 is minimum number of bytes left.
+    // TODO: actually add these values, the current return values are "don't
+    // know".
+    if (Const->getZExtValue() == 0)
+      return ReplaceInstUsesWith(CI, Constant::getAllOnesValue(Ty));
+    else
+      return ReplaceInstUsesWith(CI, ConstantInt::get(Ty, 0));
   }
   }