diff options
Diffstat (limited to 'llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index 8337d763acd..32b9fa4ec35 100644 --- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -7422,6 +7422,8 @@ SDValue DAGCombiner::visitBUILD_VECTOR(SDNode *N) { // will be type-legalized to complex code sequences. // We perform this optimization only before the operation legalizer because we // may introduce illegal operations. + // Create a new simpler BUILD_VECTOR sequence which other optimizations can + // turn into a single shuffle instruction. if ((Level == AfterLegalizeVectorOps || Level == AfterLegalizeTypes) && ValidTypes) { bool isLE = TLI.isLittleEndian(); @@ -7462,6 +7464,8 @@ SDValue DAGCombiner::visitBUILD_VECTOR(SDNode *N) { SDValue BV = DAG.getNode(ISD::BUILD_VECTOR, N->getDebugLoc(), VecVT, &Ops[0], Ops.size()); + // The new BUILD_VECTOR node has the potential to be further optimized. + AddToWorkList(BV.getNode()); // Bitcast to the desired type. return DAG.getNode(ISD::BITCAST, dl, N->getValueType(0), BV); } |
