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Correctly lower memset / memcpy of undef. It should be a nop. PR6767.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100208 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2010-04-02 19:36:14 +00:00
parent cf5862d8ac
commit f28f8bc40e
8 changed files with 94 additions and 55 deletions
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lib/Target/PowerPC/PPCISelLowering.cpp
+10 -7
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@@ -5540,15 +5540,18 @@ PPCTargetLowering::isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const {
}
/// getOptimalMemOpType - Returns the target specific optimal type for load
/// and store operations as a result of memset, memcpy, and memmove lowering.
/// If DstAlign is zero that means it's safe to destination alignment can
/// satisfy any constraint. Similarly if SrcAlign is zero it means there
/// isn't a need to check it against alignment requirement, probably because
/// the source does not need to be loaded. It returns EVT::Other if
/// SelectionDAG should be responsible for determining it.
/// and store operations as a result of memset, memcpy, and memmove
/// lowering. If DstAlign is zero that means it's safe to destination
/// alignment can satisfy any constraint. Similarly if SrcAlign is zero it
/// means there isn't a need to check it against alignment requirement,
/// probably because the source does not need to be loaded. If
/// 'NonScalarIntSafe' is true, that means it's safe to return a
/// non-scalar-integer type, e.g. empty string source, constant, or loaded
/// from memory. It returns EVT::Other if SelectionDAG should be responsible
/// for determining it.
EVT PPCTargetLowering::getOptimalMemOpType(uint64_t Size,
unsigned DstAlign, unsigned SrcAlign,
bool SafeToUseFP,
bool NonScalarIntSafe,
SelectionDAG &DAG) const {
if (this->PPCSubTarget.isPPC64()) {
return MVT::i64;