-//===-- Passes.cpp - Target independent code generation passes -*- C++ -*-===//
+//===-- Passes.cpp - Target independent code generation passes ------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file 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/RegAllocRegistry.h"
#include "llvm/CodeGen/Passes.h"
-#include "Support/CommandLine.h"
-
-namespace {
- enum RegAllocName { simple, local };
-
- cl::opt<RegAllocName>
- RegAlloc("regalloc",
- cl::desc("Register allocator to use: (default = simple)"),
- cl::Prefix,
- cl::values(clEnumVal(simple, " simple register allocator"),
- clEnumVal(local, " local register allocator"),
- 0),
- cl::init(local));
-}
-FunctionPass *createRegisterAllocator()
-{
- switch (RegAlloc) {
- case simple:
- return createSimpleRegisterAllocator();
- case local:
- return createLocalRegisterAllocator();
+using namespace llvm;
+
+//===---------------------------------------------------------------------===//
+///
+/// RegisterRegAlloc class - Track the registration of register allocators.
+///
+//===---------------------------------------------------------------------===//
+MachinePassRegistry RegisterRegAlloc::Registry;
+
+static FunctionPass *createDefaultRegisterAllocator() { return 0; }
+static RegisterRegAlloc
+defaultRegAlloc("default",
+ "pick register allocator based on -O option",
+ createDefaultRegisterAllocator);
+
+//===---------------------------------------------------------------------===//
+///
+/// RegAlloc command line options.
+///
+//===---------------------------------------------------------------------===//
+static cl::opt<RegisterRegAlloc::FunctionPassCtor, false,
+ RegisterPassParser<RegisterRegAlloc> >
+RegAlloc("regalloc",
+ cl::init(&createDefaultRegisterAllocator),
+ cl::desc("Register allocator to use"));
+
+
+//===---------------------------------------------------------------------===//
+///
+/// createRegisterAllocator - choose the appropriate register allocator.
+///
+//===---------------------------------------------------------------------===//
+FunctionPass *llvm::createRegisterAllocator(CodeGenOpt::Level OptLevel) {
+ RegisterRegAlloc::FunctionPassCtor Ctor = RegisterRegAlloc::getDefault();
+
+ if (!Ctor) {
+ Ctor = RegAlloc;
+ RegisterRegAlloc::setDefault(RegAlloc);
+ }
+
+ if (Ctor != createDefaultRegisterAllocator)
+ return Ctor();
+
+ // When the 'default' allocator is requested, pick one based on OptLevel.
+ switch (OptLevel) {
+ case CodeGenOpt::None:
+ return createFastRegisterAllocator();
default:
- assert(0 && "no register allocator selected");
- return 0; // not reached
+ return createLinearScanRegisterAllocator();
}
}