-//===-- ConstantFolding.h - Analyze constant folding possibilities --------===//
+//===-- ConstantFolding.h - Fold instructions into constants --------------===//
//
// The LLVM Compiler Infrastructure
//
//
//===----------------------------------------------------------------------===//
//
-// This family of functions determines the possibility of performing constant
-// folding.
+// This file declares routines for folding instructions into constants.
+//
+// Also, to supplement the basic VMCore ConstantExpr simplifications,
+// this file declares some additional folding routines that can make use of
+// TargetData information. These functions cannot go in VMCore due to library
+// dependency issues.
//
//===----------------------------------------------------------------------===//
class TargetData;
class Function;
class Type;
- class LLVMContext;
/// ConstantFoldInstruction - Attempt to constant fold the specified
/// instruction. If successful, the constant result is returned, if not, null
/// is returned. Note that this function can only fail when attempting to fold
/// instructions like loads and stores, which have no constant expression form.
///
-Constant *ConstantFoldInstruction(Instruction *I, LLVMContext* Context,
- const TargetData *TD = 0);
+Constant *ConstantFoldInstruction(Instruction *I, const TargetData *TD = 0);
/// ConstantFoldConstantExpression - Attempt to fold the constant expression
/// using the specified TargetData. If successful, the constant result is
/// result is returned, if not, null is returned.
-Constant *ConstantFoldConstantExpression(ConstantExpr *CE, LLVMContext* Context,
+Constant *ConstantFoldConstantExpression(const ConstantExpr *CE,
const TargetData *TD = 0);
/// ConstantFoldInstOperands - Attempt to constant fold an instruction with the
/// form.
///
Constant *ConstantFoldInstOperands(unsigned Opcode, const Type *DestTy,
- Constant*const * Ops, unsigned NumOps,
- LLVMContext* Context,
+ Constant *const *Ops, unsigned NumOps,
const TargetData *TD = 0);
/// ConstantFoldCompareInstOperands - Attempt to constant fold a compare
/// returns a constant expression of the specified operands.
///
Constant *ConstantFoldCompareInstOperands(unsigned Predicate,
- Constant*const * Ops, unsigned NumOps,
- LLVMContext* Context,
+ Constant *LHS, Constant *RHS,
const TargetData *TD = 0);
+/// ConstantFoldLoadFromConstPtr - Return the value that a load from C would
+/// produce if it is constant and determinable. If this is not determinable,
+/// return null.
+Constant *ConstantFoldLoadFromConstPtr(Constant *C, const TargetData *TD = 0);
/// ConstantFoldLoadThroughGEPConstantExpr - Given a constant and a
/// getelementptr constantexpr, return the constant value being addressed by the
/// constant expression, or null if something is funny and we can't decide.
-Constant *ConstantFoldLoadThroughGEPConstantExpr(Constant *C, ConstantExpr *CE,
- LLVMContext* Context);
+Constant *ConstantFoldLoadThroughGEPConstantExpr(Constant *C, ConstantExpr *CE);
/// canConstantFoldCallTo - Return true if its even possible to fold a call to
/// the specified function.
/// ConstantFoldCall - Attempt to constant fold a call to the specified function
/// with the specified arguments, returning null if unsuccessful.
Constant *
-ConstantFoldCall(Function *F, Constant* const* Operands, unsigned NumOperands);
+ConstantFoldCall(Function *F, Constant *const *Operands, unsigned NumOperands);
}
#endif