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Update comment, replace theoretically impossible check with an assert.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70391 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -317,13 +317,13 @@ namespace ISD {
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/// IDX, which must be a multiple of the result vector length.
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EXTRACT_SUBVECTOR,
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/// VECTOR_SHUFFLE(VEC1, VEC2, SHUFFLEVEC) - Returns a vector, of the same
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/// type as VEC1/VEC2. SHUFFLEVEC is a BUILD_VECTOR of constant int values
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/// (maybe of an illegal datatype) or undef that indicate which value each
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/// result element will get. The elements of VEC1/VEC2 are enumerated in
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/// order. This is quite similar to the Altivec 'vperm' instruction, except
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/// that the indices must be constants and are in terms of the element size
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/// of VEC1/VEC2, not in terms of bytes.
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/// VECTOR_SHUFFLE(VEC1, VEC2) - Returns a vector, of the same type as
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/// VEC1/VEC2. A VECTOR_SHUFFLE node also contains an array of constant int
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/// values that indicate which value (or undef) each result element will
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/// get. These constant ints are accessible through the
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/// ShuffleVectorSDNode class. This is quite similar to the Altivec
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/// 'vperm' instruction, except that the indices must be constants and are
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/// in terms of the element size of VEC1/VEC2, not in terms of bytes.
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VECTOR_SHUFFLE,
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/// SCALAR_TO_VECTOR(VAL) - This represents the operation of loading a
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@ -5731,9 +5731,7 @@ bool ShuffleVectorSDNode::isSplatMask(const int *Mask, MVT VT) {
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for (i = 0, e = VT.getVectorNumElements(); i != e && Mask[i] < 0; ++i)
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/* search */;
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// If we hit the end of the mask looking for a non-undef value, return false.
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if (i == e)
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return false;
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assert(i != e && "VECTOR_SHUFFLE node with all undef indices!");
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// Make sure all remaining elements are either undef or the same as the first
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// non-undef value.
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