//===-- 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 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
//
//===---------------------------------------------------------------------===//
+#include "llvm/CodeGen/RegAllocRegistry.h"
#include "llvm/CodeGen/Passes.h"
-#include "Support/CommandLine.h"
-#include <iostream>
+
using namespace llvm;
-namespace {
- enum RegAllocName { simple, local, linearscan, iterativescan };
-
- 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"),
- clEnumVal(linearscan, " linear scan register allocator"),
- clEnumVal(iterativescan, " iterative scan register allocator"),
- clEnumValEnd),
- cl::init(local));
-}
+//===---------------------------------------------------------------------===//
+///
+/// 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();
-FunctionPass *llvm::createRegisterAllocator() {
- switch (RegAlloc) {
+ 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:
- std::cerr << "no register allocator selected";
- abort();
- case simple:
- return createSimpleRegisterAllocator();
- case local:
- return createLocalRegisterAllocator();
- case linearscan:
return createLinearScanRegisterAllocator();
- case iterativescan:
- return createIterativeScanRegisterAllocator();
}
}
-