diff options
Diffstat (limited to 'include/llvm/Analysis/ValueTracking.h')
| -rw-r--r-- | include/llvm/Analysis/ValueTracking.h | 23 |
1 files changed, 19 insertions, 4 deletions
diff --git a/include/llvm/Analysis/ValueTracking.h b/include/llvm/Analysis/ValueTracking.h index 5f5f77a..212b5d1 100644 --- a/include/llvm/Analysis/ValueTracking.h +++ b/include/llvm/Analysis/ValueTracking.h @@ -23,20 +23,33 @@ namespace llvm { class Instruction; class APInt; class TargetData; + class LLVMContext; /// ComputeMaskedBits - Determine which of the bits specified in Mask are /// known to be either zero or one and return them in the KnownZero/KnownOne /// bit sets. This code only analyzes bits in Mask, in order to short-circuit /// processing. + /// + /// This function is defined on values with integer type, values with pointer + /// type (but only if TD is non-null), and vectors of integers. In the case + /// where V is a vector, the mask, known zero, and known one values are the + /// same width as the vector element, and the bit is set only if it is true + /// for all of the elements in the vector. void ComputeMaskedBits(Value *V, const APInt &Mask, APInt &KnownZero, - APInt &KnownOne, TargetData *TD = 0, + APInt &KnownOne, const TargetData *TD = 0, unsigned Depth = 0); /// MaskedValueIsZero - Return true if 'V & Mask' is known to be zero. We use /// this predicate to simplify operations downstream. Mask is known to be /// zero for bits that V cannot have. + /// + /// This function is defined on values with integer type, values with pointer + /// type (but only if TD is non-null), and vectors of integers. In the case + /// where V is a vector, the mask, known zero, and known one values are the + /// same width as the vector element, and the bit is set only if it is true + /// for all of the elements in the vector. bool MaskedValueIsZero(Value *V, const APInt &Mask, - TargetData *TD = 0, unsigned Depth = 0); + const TargetData *TD = 0, unsigned Depth = 0); /// ComputeNumSignBits - Return the number of times the sign bit of the @@ -47,7 +60,7 @@ namespace llvm { /// /// 'Op' must have a scalar integer type. /// - unsigned ComputeNumSignBits(Value *Op, TargetData *TD = 0, + unsigned ComputeNumSignBits(Value *Op, const TargetData *TD = 0, unsigned Depth = 0); /// CannotBeNegativeZero - Return true if we can prove that the specified FP @@ -64,14 +77,16 @@ namespace llvm { Value *FindInsertedValue(Value *V, const unsigned *idx_begin, const unsigned *idx_end, + LLVMContext &Context, Instruction *InsertBefore = 0); /// This is a convenience wrapper for finding values indexed by a single index /// only. inline Value *FindInsertedValue(Value *V, const unsigned Idx, + LLVMContext &Context, Instruction *InsertBefore = 0) { const unsigned Idxs[1] = { Idx }; - return FindInsertedValue(V, &Idxs[0], &Idxs[1], InsertBefore); + return FindInsertedValue(V, &Idxs[0], &Idxs[1], Context, InsertBefore); } /// GetConstantStringInfo - This function computes the length of a |
