Analog Devices Blackfin back-end.

Generate code for the Blackfin family of DSPs from Analog Devices:

  http://www.analog.com/en/embedded-processing-dsp/blackfin/processors/index.html
  
We aim to be compatible with the exsisting GNU toolchain found at:

  http://blackfin.uclinux.org/gf/project/toolchain
  
The back-end is experimental.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77897 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/Blackfin/BlackfinSubtarget.cpp b/lib/Target/Blackfin/BlackfinSubtarget.cpp
new file mode 100644
index 0000000..cf14b10
--- /dev/null
+++ b/lib/Target/Blackfin/BlackfinSubtarget.cpp
@@ -0,0 +1,26 @@
+//===- BlackfinSubtarget.cpp - BLACKFIN Subtarget Information -------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the blackfin specific subclass of TargetSubtarget.
+//
+//===----------------------------------------------------------------------===//
+
+#include "BlackfinSubtarget.h"
+#include "BlackfinGenSubtarget.inc"
+
+using namespace llvm;
+
+BlackfinSubtarget::BlackfinSubtarget(const TargetMachine &TM,
+                                     const Module &M,
+                                     const std::string &FS) {
+  std::string CPU = "generic";
+
+  // Parse features string.
+  ParseSubtargetFeatures(FS, CPU);
+}