Adding files for Microchip's PIC16 target.

A brief description about PIC16:
===============================
PIC16 is an 8-bit microcontroller with only one 8-bit register which is the 
accumulator. All arithmetic/load/store operations are 8-bit only.
The architecture has two address spaces: program and data. The program memory 
is divided into 2K pages and the data memory is divided into banks of 128 byte, with only 80 usable bytes, resulting in an non-contiguous data memory. 

It supports direct data memory access (by specifying the address as part of the instruction) and indirect data and program memory access (in an unorthodox fashion which utilize a 16 bit pointer register). 

Two classes of registers exist: (8-bit class which is only one
accumulator) (16-bit class, which contains one or more 16 bit
pointer(s))



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51027 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 27 insertions, 0 deletions

diff --git a/lib/Target/PIC16/PIC16Subtarget.cpp b/lib/Target/PIC16/PIC16Subtarget.cpp
new file mode 100644
index 0000000..77448a7
--- /dev/null
+++ b/lib/Target/PIC16/PIC16Subtarget.cpp
@@ -0,0 +1,27 @@
+//===- PIC16Subtarget.cpp - PIC16 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 PIC16 specific subclass of TargetSubtarget.
+//
+//===----------------------------------------------------------------------===//
+
+#include "PIC16Subtarget.h"
+#include "PIC16.h"
+#include "PIC16GenSubtarget.inc"
+using namespace llvm;
+
+PIC16Subtarget::PIC16Subtarget(const TargetMachine &TM, const Module &M, 
+                             const std::string &FS) 
+  :IsPIC16Old(false)
+{
+  std::string CPU = "generic";
+
+  // Parse features string.
+  ParseSubtargetFeatures(FS, CPU);
+}