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Implement createIntegerCast and createFPCast factory methods for handling

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integer and floating point cast creation. createIntegerCast generates
ZExt/SExt, BitCast or Trunc. createFPCast generates FPExt, Bitcast, or
FPTrunc.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32456 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Spencer 2006-12-12 00:49:44 +00:00
parent 4fbcdf61e8
commit 6d81a7d2ae
2 changed files with 86 additions and 0 deletions
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34
include/llvm/InstrTypes.h
View File

@ -339,6 +339,40 @@ public:
Instruction *InsertBefore = 0 ///< Place to insert the instruction
);
/// @brief Create a ZExt, BitCast, or Trunc for int -> int casts.
static CastInst *createIntegerCast(
Value *S, ///< The pointer value to be casted (operand 0)
const Type *Ty, ///< The type to which cast should be made
bool isSigned, ///< Whether to regard S as signed or not
const std::string &Name = "", ///< Name for the instruction
Instruction *InsertBefore = 0 ///< Place to insert the instruction
);
/// @brief Create a ZExt, BitCast, or Trunc for int -> int casts.
static CastInst *createIntegerCast(
Value *S, ///< The integer value to be casted (operand 0)
const Type *Ty, ///< The integer type to which operand is casted
bool isSigned, ///< Whether to regard S as signed or not
const std::string &Name, ///< The name for the instruction
BasicBlock *InsertAtEnd ///< The block to insert the instruction into
);
/// @brief Create an FPExt, BitCast, or FPTrunc for fp -> fp casts
static CastInst *createFPCast(
Value *S, ///< The floating point value to be casted
const Type *Ty, ///< The floating point type to cast to
const std::string &Name = "", ///< Name for the instruction
Instruction *InsertBefore = 0 ///< Place to insert the instruction
);
/// @brief Create an FPExt, BitCast, or FPTrunc for fp -> fp casts
static CastInst *createFPCast(
Value *S, ///< The floating point value to be casted
const Type *Ty, ///< The floating point type to cast to
const std::string &Name, ///< The name for the instruction
BasicBlock *InsertAtEnd ///< The block to insert the instruction into
);
/// @brief Create a SExt or BitCast cast instruction
static CastInst *createSExtOrBitCast(
Value *S, ///< The value to be casted (operand 0)

52
lib/VMCore/Instructions.cpp
View File

@ -1580,6 +1580,58 @@ CastInst *CastInst::createPointerCast(Value *S, const Type *Ty,
return create(Instruction::BitCast, S, Ty, Name, InsertBefore);
}
CastInst *CastInst::createIntegerCast(Value *C, const Type *Ty,
bool isSigned, const std::string &Name,
Instruction *InsertBefore) {
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 create(opcode, C, Ty, Name, InsertBefore);
}
CastInst *CastInst::createIntegerCast(Value *C, const Type *Ty,
bool isSigned, const std::string &Name,
BasicBlock *InsertAtEnd) {
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 create(opcode, C, Ty, Name, InsertAtEnd);
}
CastInst *CastInst::createFPCast(Value *C, const Type *Ty,
const std::string &Name,
Instruction *InsertBefore) {
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 create(opcode, C, Ty, Name, InsertBefore);
}
CastInst *CastInst::createFPCast(Value *C, const Type *Ty,
const std::string &Name,
BasicBlock *InsertAtEnd) {
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 create(opcode, C, Ty, Name, InsertAtEnd);
}
// Provide a way to get a "cast" where the cast opcode is inferred from the
// types and size of the operand. This, basically, is a parallel of the
// logic in the checkCast function below. This axiom should hold: