llvm::TargetLowering::SimplifyDemandedBits

Synopses

Declared in <llvm/CodeGen/TargetLowering.h>

Simplify Op using only its demanded bits, or compute its known bits.

bool
SimplifyDemandedBits(
    SDValue Op,
    APInt const& DemandedBits,
    DAGCombinerInfo& DCI) const;

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Simplify Op using only its demanded bits, or compute its known bits.

bool
SimplifyDemandedBits(
    SDValue Op,
    APInt const& DemandedBits,
    APInt const& DemandedElts,
    DAGCombinerInfo& DCI) const;

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Simplify Op using only its demanded bits, or compute its known bits.

bool
SimplifyDemandedBits(
    SDValue Op,
    APInt const& DemandedBits,
    KnownBits& Known,
    TargetLoweringOpt& TLO,
    unsigned int Depth = 0,
    bool AssumeSingleUse = false) const;

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Simplify Op using only its demanded bits, or compute its known bits.

bool
SimplifyDemandedBits(
    SDValue Op,
    APInt const& DemandedBits,
    APInt const& DemandedElts,
    KnownBits& Known,
    TargetLoweringOpt& TLO,
    unsigned int Depth = 0,
    bool AssumeSingleUse = false) const;

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Return Value

True if simplify Op using only its demanded bits, or compute its known bits.

Parameters

Name	Description
Op	SDNode or value being queried.
DemandedBits	Bit mask of bits that are demanded.
DCI	DAG combiner info.
DemandedElts	Mask of vector elements that are demanded.
Known	Known-bits or known-FP-class result to fill.
TLO	Target lowering optimization state.
Depth	Recursion depth limit for the analysis.
AssumeSingleUse	Whether a single use may be assumed.