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

1 files changed, 10 insertions, 7 deletions

diff --git a/lib/Target/PowerPC/PPCISelLowering.cpp b/lib/Target/PowerPC/PPCISelLowering.cpp
index e67666d..337b0d7 100644
--- a/lib/Target/PowerPC/PPCISelLowering.cpp
+++ b/lib/Target/PowerPC/PPCISelLowering.cpp
@@ -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;