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[X86] SimplifyMultipleUseDemandedBitsForTargetNode - use getTargetShuffleInputs with KnownUndef/Zero results. 

llvm-svn: 374725
This commit is contained in:
Simon Pilgrim 2019-10-13 17:03:11 +00:00
parent e4c58db8bc
commit 3efafd6c38
1 changed files with 11 additions and 12 deletions
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23
llvm/lib/Target/X86/X86ISelLowering.cpp
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@ -34952,9 +34952,11 @@ SDValue X86TargetLowering::SimplifyMultipleUseDemandedBitsForTargetNode(
}
}
APInt ShuffleUndef, ShuffleZero;
SmallVector<int, 16> ShuffleMask;
SmallVector<SDValue, 2> ShuffleOps;
if (getTargetShuffleInputs(Op, ShuffleOps, ShuffleMask, DAG, Depth)) {
if (getTargetShuffleInputs(Op, DemandedElts, ShuffleOps, ShuffleMask,
ShuffleUndef, ShuffleZero, DAG, Depth, false)) {
// If all the demanded elts are from one operand and are inline,
// then we can use the operand directly.
int NumOps = ShuffleOps.size();
@ -34963,15 +34965,17 @@ SDValue X86TargetLowering::SimplifyMultipleUseDemandedBitsForTargetNode(
return VT.getSizeInBits() == V.getValueSizeInBits();
})) {
if (DemandedElts.isSubsetOf(ShuffleUndef))
return DAG.getUNDEF(VT);
if (DemandedElts.isSubsetOf(ShuffleUndef | ShuffleZero))
return getZeroVector(VT.getSimpleVT(), Subtarget, DAG, SDLoc(Op));
// Bitmask that indicates which ops have only been accessed 'inline'.
APInt IdentityOp = APInt::getAllOnesValue(NumOps);
bool AllUndef = true;
for (int i = 0; i != NumElts; ++i) {
int M = ShuffleMask[i];
if (SM_SentinelUndef == M || !DemandedElts[i])
if (!DemandedElts[i] || ShuffleUndef[i])
continue;
AllUndef = false;
int Op = M / NumElts;
int Index = M % NumElts;
if (M < 0 || Index != i) {
@ -34982,16 +34986,11 @@ SDValue X86TargetLowering::SimplifyMultipleUseDemandedBitsForTargetNode(
if (IdentityOp == 0)
break;
}
if (AllUndef)
return DAG.getUNDEF(VT);
assert((IdentityOp == 0 || IdentityOp.countPopulation() == 1) &&
"Multiple identity shuffles detected");
for (int i = 0; i != NumOps; ++i)
if (IdentityOp[i])
return DAG.getBitcast(VT, ShuffleOps[i]);
if (IdentityOp != 0)
return DAG.getBitcast(VT, ShuffleOps[IdentityOp.countTrailingZeros()]);
}
}