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[DAGCombine] visitEXTRACT_SUBVECTOR - add TODO for extract_subvector(bitcast()) support

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We support 'big to little' (e.g. extract_subvector(v16i8 bitcast(v2i64))) but not 'little to big' cases  (e.g. extract_subvector(v2i64 bitcast(v16i8)))

llvm-svn: 364405
This commit is contained in:
Simon Pilgrim 2019-06-26 11:17:38 +00:00
parent 6dcbb3161e
commit a6319e5f83
1 changed files with 1 additions and 0 deletions
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llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -18132,6 +18132,7 @@ SDValue DAGCombiner::visitEXTRACT_SUBVECTOR(SDNode *N) {
return DAG.getBitcast(NVT, NewExtract);
}
}
// TODO - handle (DestNumElts % SrcNumElts) == 0
}
// Combine: