[ARM64][MC] Set the default CPU to cyclone when initilizating the MC layer.

This matches that ARM64Subtarget does for now.

This is related to <rdar://problem/16573920>

llvm-svn: 206211

1 files changed, 6 insertions, 0 deletions

diff --git a/llvm/lib/Target/ARM64/MCTargetDesc/ARM64MCTargetDesc.cpp b/llvm/lib/Target/ARM64/MCTargetDesc/ARM64MCTargetDesc.cpp
index 8d54412f531..3ce3b6575ec 100644
--- a/llvm/lib/Target/ARM64/MCTargetDesc/ARM64MCTargetDesc.cpp
+++ b/llvm/lib/Target/ARM64/MCTargetDesc/ARM64MCTargetDesc.cpp
@@ -43,6 +43,12 @@ static MCInstrInfo *createARM64MCInstrInfo() {
 static MCSubtargetInfo *createARM64MCSubtargetInfo(StringRef TT, StringRef CPU,
                                                    StringRef FS) {
   MCSubtargetInfo *X = new MCSubtargetInfo();
+
+  // FIXME: Make this darwin-only.
+  if (CPU.empty())
+    // We default to Cyclone for now, on Darwin.
+    CPU = "cyclone";
+
   InitARM64MCSubtargetInfo(X, TT, CPU, FS);
   return X;
 }