1 files changed, 49 insertions, 0 deletions
diff --git a/lib/CodeGen/Passes.cpp b/lib/CodeGen/Passes.cpp
new file mode 100644
index 0000000000..a6ba12072e
--- /dev/null
+++ b/lib/CodeGen/Passes.cpp
@@ -0,0 +1,49 @@
+//===-- Passes.cpp - Target independent code generation passes ------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines interfaces to access the target independent code
+// generation passes provided by the LLVM backend.
+//
+//===---------------------------------------------------------------------===//
+
+#include "llvm/CodeGen/Passes.h"
+#include "llvm/Support/CommandLine.h"
+#include <iostream>
+using namespace llvm;
+
+namespace {
+  enum RegAllocName { simple, local, linearscan };
+
+  cl::opt<RegAllocName>
+  RegAlloc(
+    "regalloc",
+    cl::desc("Register allocator to use: (default = linearscan)"),
+    cl::Prefix,
+    cl::values(
+       clEnumVal(simple,        "  simple register allocator"),
+       clEnumVal(local,         "  local register allocator"),
+       clEnumVal(linearscan,    "  linear scan register allocator"),
+       clEnumValEnd),
+    cl::init(linearscan));
+}
+
+FunctionPass *llvm::createRegisterAllocator() {
+  switch (RegAlloc) {
+  default:
+    std::cerr << "no register allocator selected";
+    abort();
+  case simple:
+    return createSimpleRegisterAllocator();
+  case local:
+    return createLocalRegisterAllocator();
+  case linearscan:
+    return createLinearScanRegisterAllocator();
+  }
+}
+