diff options
| -rw-r--r-- | lib/VMCore/ConstantFold.cpp | 83 |
1 files changed, 30 insertions, 53 deletions
diff --git a/lib/VMCore/ConstantFold.cpp b/lib/VMCore/ConstantFold.cpp index 29910b7..8af5b89 100644 --- a/lib/VMCore/ConstantFold.cpp +++ b/lib/VMCore/ConstantFold.cpp @@ -680,66 +680,43 @@ Constant *llvm::ConstantFoldCastInstruction(unsigned opc, const Constant *V, switch (opc) { case Instruction::FPTrunc: case Instruction::FPExt: - return ConstantFP::get(DestTy, cast<ConstantFP>(V)->getValue()); - case Instruction::FPToUI: { - double dVal = cast<ConstantFP>(V)->getValue(); - uint64_t iVal = (uint64_t) dVal; - return ConstantIntegral::get(DestTy, iVal); - } - case Instruction::FPToSI: { - double dVal = cast<ConstantFP>(V)->getValue(); - int64_t iVal = (int64_t) dVal; - return ConstantIntegral::get(DestTy, iVal); - } - case Instruction::IntToPtr: //always treated as unsigned - if (V->isNullValue()) // Is it a FP or Integral null value? + if (const ConstantFP *FPC = dyn_cast<ConstantFP>(V)) + return ConstantFP::get(DestTy, FPC->getValue()); + return 0; // Can't fold. + case Instruction::FPToUI: + if (const ConstantFP *FPC = dyn_cast<ConstantFP>(V)) + return ConstantIntegral::get(DestTy,(uint64_t) FPC->getValue()); + return 0; // Can't fold. + case Instruction::FPToSI: + if (const ConstantFP *FPC = dyn_cast<ConstantFP>(V)) + return ConstantIntegral::get(DestTy,(int64_t) FPC->getValue()); + return 0; // Can't fold. + case Instruction::IntToPtr: //always treated as unsigned + if (V->isNullValue()) // Is it an integral null value? return ConstantPointerNull::get(cast<PointerType>(DestTy)); - return 0; // Other pointer types cannot be casted - case Instruction::PtrToInt: // always treated as unsigned - if (V->isNullValue()) + return 0; // Other pointer types cannot be casted + case Instruction::PtrToInt: // always treated as unsigned + if (V->isNullValue()) // is it a null pointer value? return ConstantIntegral::get(DestTy, 0); - return 0; // Other pointer types cannot be casted - case Instruction::UIToFP: { - // First, extract the unsigned integer value - uint64_t Val; - if (isa<ConstantInt>(V)) - Val = cast<ConstantIntegral>(V)->getZExtValue(); - else if (const ConstantBool *CB = dyn_cast<ConstantBool>(V)) - Val = CB->getValue() ? 1 : 0; - // Now generate the equivalent floating point value - double dVal = (double) Val; - return ConstantFP::get(DestTy, dVal); - } - case Instruction::SIToFP: { - // First, extract the signed integer value - int64_t Val; - if (isa<ConstantInt>(V)) - Val = cast<ConstantIntegral>(V)->getSExtValue(); - else if (const ConstantBool *CB = dyn_cast<ConstantBool>(V)) - Val = CB->getValue() ? -1 : 0; - // Now generate the equivalent floating point value - double dVal = (double) Val; - return ConstantFP::get(DestTy, dVal); - } + return 0; // Other pointer types cannot be casted + case Instruction::UIToFP: + if (const ConstantIntegral *CI = dyn_cast<ConstantIntegral>(V)) + return ConstantFP::get(DestTy, double(CI->getZExtValue())); + return 0; + case Instruction::SIToFP: + if (const ConstantIntegral *CI = dyn_cast<ConstantIntegral>(V)) + return ConstantFP::get(DestTy, double(CI->getSExtValue())); + return 0; case Instruction::ZExt: - // Handle trunc directly here if it is a ConstantIntegral. - if (isa<ConstantInt>(V)) - return ConstantInt::get(DestTy, cast<ConstantInt>(V)->getZExtValue()); - else if (const ConstantBool *CB = dyn_cast<ConstantBool>(V)) - return ConstantInt::get(DestTy, CB->getValue() ? 1 : 0); + if (const ConstantIntegral *CI = dyn_cast<ConstantIntegral>(V)) + return ConstantInt::get(DestTy, CI->getZExtValue()); return 0; case Instruction::SExt: - // A SExt always produces a signed value so we need to cast the value - // now before we try to cast it to the destiniation type. - if (isa<ConstantInt>(V)) - return ConstantInt::get(DestTy, cast<ConstantInt>(V)->getSExtValue()); - else if (const ConstantBool *CB = dyn_cast<ConstantBool>(V)) - return ConstantInt::get(DestTy, CB->getValue() ? -1 : 0); + if (const ConstantIntegral *CI = dyn_cast<ConstantIntegral>(V)) + return ConstantInt::get(DestTy, CI->getSExtValue()); return 0; case Instruction::Trunc: - // We just handle trunc directly here. The code below doesn't work for - // trunc to bool. - if (const ConstantInt *CI = dyn_cast<ConstantInt>(V)) + if (const ConstantInt *CI = dyn_cast<ConstantInt>(V)) // Can't trunc a bool return ConstantIntegral::get(DestTy, CI->getZExtValue()); return 0; case Instruction::BitCast: |