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Update comment, replace theoretically impossible check with an assert.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70391 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nate Begeman
2009-04-29 18:13:31 +00:00
parent c9cf35055f
commit a641575828
2 changed files with 8 additions and 10 deletions
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14
include/llvm/CodeGen/SelectionDAGNodes.h
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@@ -317,13 +317,13 @@ namespace ISD {
/// IDX, which must be a multiple of the result vector length. /// IDX, which must be a multiple of the result vector length.
EXTRACT_SUBVECTOR, EXTRACT_SUBVECTOR,
/// VECTOR_SHUFFLE(VEC1, VEC2, SHUFFLEVEC) - Returns a vector, of the same /// VECTOR_SHUFFLE(VEC1, VEC2) - Returns a vector, of the same type as
/// type as VEC1/VEC2. SHUFFLEVEC is a BUILD_VECTOR of constant int values /// VEC1/VEC2. A VECTOR_SHUFFLE node also contains an array of constant int
/// (maybe of an illegal datatype) or undef that indicate which value each /// values that indicate which value (or undef) each result element will
/// result element will get. The elements of VEC1/VEC2 are enumerated in /// get. These constant ints are accessible through the
/// order. This is quite similar to the Altivec 'vperm' instruction, except /// ShuffleVectorSDNode class. This is quite similar to the Altivec
/// that the indices must be constants and are in terms of the element size /// 'vperm' instruction, except that the indices must be constants and are
/// of VEC1/VEC2, not in terms of bytes. /// in terms of the element size of VEC1/VEC2, not in terms of bytes.
VECTOR_SHUFFLE, VECTOR_SHUFFLE,
/// SCALAR_TO_VECTOR(VAL) - This represents the operation of loading a /// SCALAR_TO_VECTOR(VAL) - This represents the operation of loading a

4
lib/CodeGen/SelectionDAG/SelectionDAG.cpp
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@@ -5731,9 +5731,7 @@ bool ShuffleVectorSDNode::isSplatMask(const int *Mask, MVT VT) {
for (i = 0, e = VT.getVectorNumElements(); i != e && Mask[i] < 0; ++i) for (i = 0, e = VT.getVectorNumElements(); i != e && Mask[i] < 0; ++i)
/* search */; /* search */;
// If we hit the end of the mask looking for a non-undef value, return false. assert(i != e && "VECTOR_SHUFFLE node with all undef indices!");
if (i == e)
return false;
// Make sure all remaining elements are either undef or the same as the first // Make sure all remaining elements are either undef or the same as the first
// non-undef value. // non-undef value.