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Correctly lower memset / memcpy of undef. It should be a nop. PR6767.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100208 91177308-0d34-0410-b5e6-96231b3b80d8
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@@ -633,15 +633,19 @@ public:
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}
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/// getOptimalMemOpType - Returns the target specific optimal type for load
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/// and store operations as a result of memset, memcpy, and memmove lowering.
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/// If DstAlign is zero that means it's safe to destination alignment can
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/// satisfy any constraint. Similarly if SrcAlign is zero it means there isn't
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/// a need to check it against alignment requirement, probably because the
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/// source does not need to be loaded. It returns EVT::Other if SelectionDAG
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/// should be responsible for determining it.
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/// and store operations as a result of memset, memcpy, and memmove
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/// lowering. If DstAlign is zero that means it's safe to destination
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/// alignment can satisfy any constraint. Similarly if SrcAlign is zero it
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/// means there isn't a need to check it against alignment requirement,
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/// probably because the source does not need to be loaded. If
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/// 'NonScalarIntSafe' is true, that means it's safe to return a
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/// non-scalar-integer type, e.g. empty string source, constant, or loaded
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/// from memory. It returns EVT::Other if SelectionDAG should be responsible
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/// for determining it.
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virtual EVT getOptimalMemOpType(uint64_t Size,
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unsigned DstAlign, unsigned SrcAlign,
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bool SafeToUseFP, SelectionDAG &DAG) const {
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bool NonScalarIntSafe,
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SelectionDAG &DAG) const {
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return MVT::Other;
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}
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