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[TargetLowering] SimplifyDemandedBits - Remove GetDemandedSrcMask lambda. NFCI.

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An older version of this could return false but now that this always succeeds we can just inline and simplify it.

llvm-svn: 357999
This commit is contained in:
Simon Pilgrim 2019-04-09 12:29:26 +00:00
parent 9185492178
commit 502506a124
1 changed files with 22 additions and 29 deletions

51
lib/CodeGen/SelectionDAG/TargetLowering.cpp

@ -1402,37 +1402,30 @@ bool TargetLowering::SimplifyDemandedBits(
if (SrcVT.isVector() && NumSrcEltBits > 1 &&
(BitWidth % NumSrcEltBits) == 0 &&
TLO.DAG.getDataLayout().isLittleEndian()) {
auto GetDemandedSrcMask = [&](APInt &DemandedSrcBits,
APInt &DemandedSrcElts) -> bool {
unsigned Scale = BitWidth / NumSrcEltBits;
unsigned NumSrcElts = SrcVT.getVectorNumElements();
DemandedSrcBits = APInt::getNullValue(NumSrcEltBits);
DemandedSrcElts = APInt::getNullValue(NumSrcElts);
for (unsigned i = 0; i != Scale; ++i) {
unsigned Offset = i * NumSrcEltBits;
APInt Sub = DemandedBits.extractBits(NumSrcEltBits, Offset);
if (!Sub.isNullValue()) {
DemandedSrcBits |= Sub;
for (unsigned j = 0; j != NumElts; ++j)
if (DemandedElts[j])
DemandedSrcElts.setBit((j * Scale) + i);
}
unsigned Scale = BitWidth / NumSrcEltBits;
unsigned NumSrcElts = SrcVT.getVectorNumElements();
APInt DemandedSrcBits = APInt::getNullValue(NumSrcEltBits);
APInt DemandedSrcElts = APInt::getNullValue(NumSrcElts);
for (unsigned i = 0; i != Scale; ++i) {
unsigned Offset = i * NumSrcEltBits;
APInt Sub = DemandedBits.extractBits(NumSrcEltBits, Offset);
if (!Sub.isNullValue()) {
DemandedSrcBits |= Sub;
for (unsigned j = 0; j != NumElts; ++j)
if (DemandedElts[j])
DemandedSrcElts.setBit((j * Scale) + i);
}
return true;
};
APInt DemandedSrcBits, DemandedSrcElts;
if (GetDemandedSrcMask(DemandedSrcBits, DemandedSrcElts)) {
APInt KnownSrcUndef, KnownSrcZero;
if (SimplifyDemandedVectorElts(Src, DemandedSrcElts, KnownSrcUndef,
KnownSrcZero, TLO, Depth + 1))
return true;
KnownBits KnownSrcBits;
if (SimplifyDemandedBits(Src, DemandedSrcBits, DemandedSrcElts,
KnownSrcBits, TLO, Depth + 1))
return true;
}
APInt KnownSrcUndef, KnownSrcZero;
if (SimplifyDemandedVectorElts(Src, DemandedSrcElts, KnownSrcUndef,
KnownSrcZero, TLO, Depth + 1))
return true;
KnownBits KnownSrcBits;
if (SimplifyDemandedBits(Src, DemandedSrcBits, DemandedSrcElts,
KnownSrcBits, TLO, Depth + 1))
return true;
}
// If this is a bitcast, let computeKnownBits handle it. Only do this on a