diff options
| -rw-r--r-- | include/llvm/Constants.h | 6 | ||||
| -rw-r--r-- | lib/VMCore/Constants.cpp | 16 |
2 files changed, 22 insertions, 0 deletions
diff --git a/include/llvm/Constants.h b/include/llvm/Constants.h index dd85b43bc7..e8ded56dcf 100644 --- a/include/llvm/Constants.h +++ b/include/llvm/Constants.h @@ -358,6 +358,12 @@ public: /// created as ConstantAggregateZero objects. virtual bool isNullValue() const { return false; } + /// This function will return true iff every element in this packed constant + /// is set to all ones. + /// @returns true iff this constant's emements are all set to all ones. + /// @brief Determine if the value is all ones. + virtual bool isAllOnesValue() const; + virtual void destroyConstant(); virtual void replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U); diff --git a/lib/VMCore/Constants.cpp b/lib/VMCore/Constants.cpp index c2332c6e61..50b8982278 100644 --- a/lib/VMCore/Constants.cpp +++ b/lib/VMCore/Constants.cpp @@ -1166,6 +1166,22 @@ void ConstantPacked::destroyConstant() { destroyConstantImpl(); } +/// This function will return true iff every element in this packed constant +/// is set to all ones. +/// @returns true iff this constant's emements are all set to all ones. +/// @brief Determine if the value is all ones. +bool ConstantPacked::isAllOnesValue() const { + // Check out first element. + const Constant *Elt = getOperand(0); + const ConstantInt *CI = dyn_cast<ConstantInt>(Elt); + if (!CI || !CI->isAllOnesValue()) return false; + // Then make sure all remaining elements point to the same value. + for (unsigned I = 1, E = getNumOperands(); I < E; ++I) { + if (getOperand(I) != Elt) return false; + } + return true; +} + //---- ConstantPointerNull::get() implementation... // |