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Add a FIXME about the VECTOR_SHUFFLE evil hack.

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llvm-svn: 47676
This commit is contained in:
Duncan Sands 2008-02-27 17:39:13 +00:00
parent 8dc3548bdf
commit 0139087442
1 changed files with 2 additions and 0 deletions
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lib/CodeGen/SelectionDAG/LegalizeTypesSplit.cpp
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@ -547,6 +547,8 @@ SDOperand DAGTypeLegalizer::SplitOp_VECTOR_SHUFFLE(SDNode *N, unsigned OpNo) {
// If the element type is not legal, find a larger legal type to use for
// the BUILD_VECTOR operands. This is an ugly hack, but seems to work!
// FIXME: The real solution is to change VECTOR_SHUFFLE into a variadic
// node where the shuffle mask is a list of integer operands, #2 .. #2+n.
for (MVT::SimpleValueType OpVT = EltVT; OpVT <= MVT::LAST_INTEGER_VALUETYPE;
// Integer values types are consecutively numbered. Exploit this.
OpVT = MVT::SimpleValueType(OpVT + 1)) {