diff --git a/include/llvm/Constants.h b/include/llvm/Constants.h index 04cad0b1b7e..f06d15e26d7 100644 --- a/include/llvm/Constants.h +++ b/include/llvm/Constants.h @@ -559,6 +559,19 @@ public: const Type *Ty ///< The type to which cast should be made ); + /// @brief Create a ZExt, Bitcast or Trunc for integer -> integer casts + static Constant *getIntegerCast( + Constant *C, ///< The integer constant to be casted + const Type *Ty, ///< The integer type to cast to + bool isSigned ///< Whether C should be treated as signed or not + ); + + /// @brief Create a FPExt, Bitcast or FPTrunc for fp -> fp casts + static Constant *getFPCast( + Constant *C, ///< The integer constant to be casted + const Type *Ty ///< The integer type to cast to + ); + static Constant *getCast(Constant *C, const Type *Ty); /// @brief Return true if this is a convert constant expression diff --git a/lib/VMCore/Constants.cpp b/lib/VMCore/Constants.cpp index b59341d9272..2aa0524dfd0 100644 --- a/lib/VMCore/Constants.cpp +++ b/lib/VMCore/Constants.cpp @@ -1514,6 +1514,29 @@ Constant *ConstantExpr::getPointerCast(Constant *S, const Type *Ty) { return getCast(Instruction::BitCast, S, Ty); } +Constant *ConstantExpr::getIntegerCast(Constant *C, const Type *Ty, + bool isSigned) { + assert(C->getType()->isIntegral() && Ty->isIntegral() && "Invalid cast"); + unsigned SrcBits = C->getType()->getPrimitiveSizeInBits(); + unsigned DstBits = Ty->getPrimitiveSizeInBits(); + Instruction::CastOps opcode = + (SrcBits == DstBits ? Instruction::BitCast : + (SrcBits > DstBits ? Instruction::Trunc : + (isSigned ? Instruction::SExt : Instruction::ZExt))); + return getCast(opcode, C, Ty); +} + +Constant *ConstantExpr::getFPCast(Constant *C, const Type *Ty) { + assert(C->getType()->isFloatingPoint() && Ty->isFloatingPoint() && + "Invalid cast"); + unsigned SrcBits = C->getType()->getPrimitiveSizeInBits(); + unsigned DstBits = Ty->getPrimitiveSizeInBits(); + Instruction::CastOps opcode = + (SrcBits == DstBits ? Instruction::BitCast : + (SrcBits > DstBits ? Instruction::FPTrunc : Instruction::FPExt)); + return getCast(opcode, C, Ty); +} + Constant *ConstantExpr::getTrunc(Constant *C, const Type *Ty) { assert(C->getType()->isInteger() && "Trunc operand must be integer"); assert(Ty->isIntegral() && "Trunc produces only integral");