¶void computeKnownBits(
    const llvm::Value* V,
    llvm::KnownBits& Known,
    const llvm::DataLayout& DL,
    unsigned int Depth = 0,
    llvm::AssumptionCache* AC = nullptr,
    const llvm::Instruction* CxtI = nullptr,
    const llvm::DominatorTree* DT = nullptr,
    llvm::OptimizationRemarkEmitter* ORE =
        nullptr,
    bool UseInstrInfo = true)

Description

Determine which bits of V are known to be either zero or one and return them in the KnownZero/KnownOne bit sets. This function is defined on values with integer type, values with pointer type, and vectors of integers. In the case where V is a vector, the 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.

Declared at: llvm/include/llvm/Analysis/ValueTracking.h:54

Parameters

const llvm::Value* V

llvm::KnownBits& Known

const llvm::DataLayout& DL

unsigned int Depth = 0

llvm::AssumptionCache* AC = nullptr

const llvm::Instruction* CxtI = nullptr

const llvm::DominatorTree* DT = nullptr

llvm::OptimizationRemarkEmitter* ORE = nullptr

bool UseInstrInfo = true