Add an intrinsic and codegen support for fused multiply-accumulate. The intent

[oota-llvm.git] / lib / CodeGen / Passes.cpp

diff --git a/lib/CodeGen/Passes.cpp b/lib/CodeGen/Passes.cpp
index bdcac4c6d12f9cb9fe9f63bc9fa8d1ce1639fae7..315aedddb9ef199e3951e49d83d2e906a423b626 100644 (file)
--- 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
@@ -12,36 +12,62 @@
 //
 //===---------------------------------------------------------------------===//
 
+#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 };
-
-  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 global register allocator"),
-                      0),
-           cl::init(local));
-}
+//===---------------------------------------------------------------------===//
+///
+/// RegisterRegAlloc class - Track the registration of register allocators.
+///
+//===---------------------------------------------------------------------===//
+MachinePassRegistry RegisterRegAlloc::Registry;
 
-FunctionPass *llvm::createRegisterAllocator() {
-  switch (RegAlloc) {
-  default:
-    std::cerr << "no register allocator selected";
-    abort();
-  case simple:
-    return createSimpleRegisterAllocator();
-  case local:
-    return createLocalRegisterAllocator();
-  case linearscan:
+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);
+  }
+
+  // This forces linking of the linear scan register allocator,
+  // so -regalloc=linearscan still works in clang.
+  if (Ctor == createLinearScanRegisterAllocator)
     return createLinearScanRegisterAllocator();
+
+  if (Ctor != createDefaultRegisterAllocator)
+    return Ctor();
+
+  // When the 'default' allocator is requested, pick one based on OptLevel.
+  switch (OptLevel) {
+  case CodeGenOpt::None:
+    return createFastRegisterAllocator();
+  default:
+    return createGreedyRegisterAllocator();
   }
 }
-