Avoid using f64 to lower memcpy from constant string. It's cheaper to use i32 store of immediates.

llvm-svn: 100751

1 files changed, 5 insertions, 2 deletions

diff --git a/llvm/lib/Target/PowerPC/PPCISelLowering.cpp b/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
index 9cd01be54e4..992cc5a95cf 100644
--- a/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
+++ b/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
@@ -5547,11 +5547,14 @@ PPCTargetLowering::isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const {
 /// 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.
+/// from memory. 'MemcpyStrSrc' indicates whether the memcpy source is
+/// constant so it does not need to be loaded.
+/// It returns EVT::Other if SelectionDAG should be responsible for
+/// determining the type.
 EVT PPCTargetLowering::getOptimalMemOpType(uint64_t Size,
                                            unsigned DstAlign, unsigned SrcAlign,
                                            bool NonScalarIntSafe,
+                                           bool MemcpyStrSrc,
                                            SelectionDAG &DAG) const {
   if (this->PPCSubTarget.isPPC64()) {
     return MVT::i64;