Implement Subtarget support

Implement the X86 Subtarget.

This consolidates the checks for target triple, and setting options based
on target triple into one place.  This allows us to convert the asm printer
and isel over from being littered with "forDarwin", "forCygwin", etc. into
just having the appropriate flags for each subtarget feature controlling
the code for that feature.

This patch also implements indirect external and weak references in the
X86 pattern isel, for darwin.  Next up is to convert over the asm printers
to use this new interface.

llvm-svn: 22389

1 files changed, 22 insertions, 0 deletions

diff --git a/llvm/lib/Target/TargetSubtarget.cpp b/llvm/lib/Target/TargetSubtarget.cpp
new file mode 100644
index 00000000000..ebb13084752
--- /dev/null
+++ b/llvm/lib/Target/TargetSubtarget.cpp
@@ -0,0 +1,22 @@
+//===-- TargetSubtarget.cpp - General Target Information -------------------==//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by Nate Begeman and is distributed under the 
+// University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file describes the general parts of a Subtarget.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Target/TargetSubtarget.h"
+using namespace llvm;
+
+//---------------------------------------------------------------------------
+// TargetSubtarget Class
+//
+TargetSubtarget::TargetSubtarget(const Module &M) {}
+
+TargetSubtarget::~TargetSubtarget() {}