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Replace some explicit checks with asserts for conditions that should never happen.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154305 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Craig Topper 2012-04-09 05:16:56 +00:00
parent ab5a55e118
commit ae1bec52f7
1 changed files with 7 additions and 14 deletions
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21
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -7698,8 +7698,7 @@ SDValue DAGCombiner::visitVECTOR_SHUFFLE(SDNode *N) {
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
assert(N0.getValueType().getVectorNumElements() == NumElts &&
"Vector shuffle must be normalized in DAG");
assert(N0.getValueType() == VT && "Vector shuffle must be normalized in DAG");
// Canonicalize shuffle undef, undef -> undef
if (N0.getOpcode() == ISD::UNDEF && N1.getOpcode() == ISD::UNDEF)
@ -7804,27 +7803,21 @@ SDValue DAGCombiner::visitVECTOR_SHUFFLE(SDNode *N) {
if (N0.getOperand(1).getOpcode() != ISD::UNDEF)
return SDValue();
// The incoming shuffle must be of the same type as the result of the current
// shuffle.
if (OtherSV->getOperand(0).getValueType() != VT)
return SDValue();
EVT InVT = N0.getValueType();
int InNumElts = InVT.getVectorNumElements();
// The incoming shuffle must be of the same type as the result of the
// current shuffle.
assert(OtherSV->getOperand(0).getValueType() == VT &&
"Shuffle types don't match");
for (unsigned i = 0; i != NumElts; ++i) {
int Idx = SVN->getMaskElt(i);
// If we access the second (undef) operand then this index can be
// canonicalized to undef as well.
if (Idx >= InNumElts)
Idx = -1;
assert(Idx < (int)NumElts && "Index references undef operand");
// Next, this index comes from the first value, which is the incoming
// shuffle. Adopt the incoming index.
if (Idx >= 0)
Idx = OtherSV->getMaskElt(Idx);
// The combined shuffle must map each index to itself.
if ((unsigned)Idx != i && Idx != -1)
if (Idx >= 0 && (unsigned)Idx != i)
return SDValue();
}