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[x86] Switch an if which is trivially true to an assert. NFC 

llvm-svn: 229669
This commit is contained in:
Chandler Carruth 2015-02-18 11:46:27 +00:00
parent 8f3e585b17
commit 811f0ee8c1
1 changed files with 14 additions and 14 deletions
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28
llvm/lib/Target/X86/X86ISelLowering.cpp
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@ -8618,26 +8618,26 @@ static SDValue lowerV2I64VectorShuffle(SDValue Op, SDValue V1, SDValue V2,
DAG.getNode(X86ISD::PSHUFD, SDLoc(Op), MVT::v4i32, V1,
getV4X86ShuffleImm8ForMask(WidenedMask, DAG)));
}
assert((Mask[0] >= 2) + (Mask[1] >= 2) == 1 &&
"Canonicalization ensures we only see shuffles with two inputs.");
// Try to use shift instructions.
if (SDValue Shift =
lowerVectorShuffleAsShift(DL, MVT::v2i64, V1, V2, Mask, DAG))
return Shift;
// If we have a single input from V2 insert that into V1 if we can do so
// cheaply.
if ((Mask[0] >= 2) + (Mask[1] >= 2) == 1) {
if (SDValue Insertion = lowerVectorShuffleAsElementInsertion(
MVT::v2i64, DL, V1, V2, Mask, Subtarget, DAG))
return Insertion;
// Try inverting the insertion since for v2 masks it is easy to do and we
// can't reliably sort the mask one way or the other.
int InverseMask[2] = {Mask[0] < 0 ? -1 : (Mask[0] ^ 2),
Mask[1] < 0 ? -1 : (Mask[1] ^ 2)};
if (SDValue Insertion = lowerVectorShuffleAsElementInsertion(
MVT::v2i64, DL, V2, V1, InverseMask, Subtarget, DAG))
return Insertion;
}
// When loading a scalar and then shuffling it into a vector we can often do
// the insertion cheaply.
if (SDValue Insertion = lowerVectorShuffleAsElementInsertion(
MVT::v2i64, DL, V1, V2, Mask, Subtarget, DAG))
return Insertion;
// Try inverting the insertion since for v2 masks it is easy to do and we
// can't reliably sort the mask one way or the other.
int InverseMask[2] = {Mask[0] < 0 ? -1 : (Mask[0] ^ 2),
Mask[1] < 0 ? -1 : (Mask[1] ^ 2)};
if (SDValue Insertion = lowerVectorShuffleAsElementInsertion(
MVT::v2i64, DL, V2, V1, InverseMask, Subtarget, DAG))
return Insertion;
// We have different paths for blend lowering, but they all must use the
// *exact* same predicate.