ARM backend contribution from Apple.
llvm-svn: 33353
diff --git a/llvm/lib/Target/ARM/ARMSubtarget.cpp b/llvm/lib/Target/ARM/ARMSubtarget.cpp
new file mode 100644
index 0000000..35bb9ac
--- /dev/null
+++ b/llvm/lib/Target/ARM/ARMSubtarget.cpp
@@ -0,0 +1,52 @@
+//===-- ARMSubtarget.cpp - ARM Subtarget Information ------------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by Evan Cheng and is distributed under the
+// University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the ARM specific subclass of TargetSubtarget.
+//
+//===----------------------------------------------------------------------===//
+
+#include "ARMSubtarget.h"
+#include "ARMGenSubtarget.inc"
+#include "llvm/Module.h"
+#include "llvm/Support/CommandLine.h"
+using namespace llvm;
+
+// FIXME: this is temporary.
+static cl::opt<bool> Thumb("enable-thumb",
+ cl::desc("Switch to thumb mode in ARM backend"));
+
+ARMSubtarget::ARMSubtarget(const Module &M, const std::string &FS)
+ : ARMArchVersion(V4T), HasVFP2(false), IsDarwin(false),
+ UseThumbBacktraces(false), IsR9Reserved(false), stackAlignment(8) {
+
+ // Determine default and user specified characteristics
+ std::string CPU = "generic";
+
+ // Parse features string.
+ ParseSubtargetFeatures(FS, CPU);
+
+ IsThumb = Thumb;
+
+ // Set the boolean corresponding to the current target triple, or the default
+ // if one cannot be determined, to true.
+ const std::string& TT = M.getTargetTriple();
+ if (TT.length() > 5) {
+ IsDarwin = TT.find("-darwin") != std::string::npos;
+ } else if (TT.empty()) {
+#if defined(__APPLE__)
+ IsDarwin = true;
+#endif
+ }
+
+ if (IsDarwin) {
+ UseThumbBacktraces = true;
+ IsR9Reserved = true;
+ stackAlignment = 4;
+ }
+}