X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FCodeGen%2FPasses.cpp;h=3489db2e9f4f966a401ff9c7ac1ccbf1e58b2f62;hb=98ec91ea80e042907aac8d3cbd9614d29f6cba45;hp=f5cd6066e416af235e48ca14faa39952b8b9d12b;hpb=0bafa9818baafc969359a668245cff7d95268931;p=oota-llvm.git

diff --git a/lib/CodeGen/Passes.cpp b/lib/CodeGen/Passes.cpp
index f5cd6066e41..3489db2e9f4 100644
--- a/lib/CodeGen/Passes.cpp
+++ b/lib/CodeGen/Passes.cpp
@@ -1,10 +1,10 @@
 //===-- 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
@@ -12,41 +12,57 @@
 //
 //===---------------------------------------------------------------------===//
 
+#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(linearscan));
-}
+//===---------------------------------------------------------------------===//
+///
+/// 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();
   }
 }
-