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[X86] Resolve KnownUndef/KnownZero bits into target shuffle masks in helper. NFCI. 

llvm-svn: 374878
This commit is contained in:
Simon Pilgrim 2019-10-15 11:13:51 +00:00
parent ed29dbaafa
commit 70778444c7
1 changed files with 18 additions and 9 deletions
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27
llvm/lib/Target/X86/X86ISelLowering.cpp
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@ -6807,6 +6807,22 @@ static bool getTargetShuffleAndZeroables(SDValue N, SmallVectorImpl<int> &Mask,
return true;
}
// Replace target shuffle mask elements with known undef/zero sentinels.
static void resolveTargetShuffleAndZeroables(SmallVectorImpl<int> &Mask,
const APInt &KnownUndef,
const APInt &KnownZero) {
unsigned NumElts = Mask.size();
assert(KnownUndef.getBitWidth() == NumElts &&
KnownZero.getBitWidth() == NumElts && "Shuffle mask size mismatch");
for (unsigned i = 0; i != NumElts; ++i) {
if (KnownUndef[i])
Mask[i] = SM_SentinelUndef;
else if (KnownZero[i])
Mask[i] = SM_SentinelZero;
}
}
// Forward declaration (for getFauxShuffleMask recursive check).
// TODO: Use DemandedElts variant.
static bool getTargetShuffleInputs(SDValue Op, SmallVectorImpl<SDValue> &Inputs,
@ -7256,15 +7272,8 @@ static bool getTargetShuffleInputs(SDValue Op, const APInt &DemandedElts,
return false;
if (getTargetShuffleAndZeroables(Op, Mask, Inputs, KnownUndef, KnownZero)) {
for (int i = 0, e = Mask.size(); i != e; ++i) {
int &M = Mask[i];
if (M < 0 || !ResolveKnownElts)
continue;
if (KnownUndef[i])
M = SM_SentinelUndef;
else if (KnownZero[i])
M = SM_SentinelZero;
}
if (ResolveKnownElts)
resolveTargetShuffleAndZeroables(Mask, KnownUndef, KnownZero);
return true;
}
if (getFauxShuffleMask(Op, DemandedElts, Mask, Inputs, DAG, Depth,