TargetSchedModel interface. To be implemented...

llvm-svn: 163934

3 files changed, 39 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/CMakeLists.txt b/llvm/lib/CodeGen/CMakeLists.txt
index 386509b702e..96c82c06692 100644
--- a/llvm/lib/CodeGen/CMakeLists.txt
+++ b/llvm/lib/CodeGen/CMakeLists.txt
@@ -102,6 +102,7 @@ add_llvm_library(LLVMCodeGen
   TargetInstrInfoImpl.cpp
   TargetLoweringObjectFileImpl.cpp
   TargetOptionsImpl.cpp
+  TargetSchedule.cpp
   TwoAddressInstructionPass.cpp
   UnreachableBlockElim.cpp
   VirtRegMap.cpp
diff --git a/llvm/lib/CodeGen/TargetSchedule.cpp b/llvm/lib/CodeGen/TargetSchedule.cpp
new file mode 100644
index 00000000000..42effb415b7
--- /dev/null
+++ b/llvm/lib/CodeGen/TargetSchedule.cpp
@@ -0,0 +1,32 @@
+//===-- llvm/Target/TargetSchedule.cpp - Sched Machine Model ----*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements a wrapper around MCSchedModel that allows the interface
+// to benefit from information currently only available in TargetInstrInfo.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/CodeGen/TargetSchedule.h"
+#include "llvm/Target/TargetInstrInfo.h"
+#include "llvm/Target/TargetSubtargetInfo.h"
+#include "llvm/Support/CommandLine.h"
+
+using namespace llvm;
+
+static cl::opt<bool> EnableSchedModel("schedmodel", cl::Hidden, cl::init(false),
+  cl::desc("Use TargetSchedModel for latency lookup"));
+
+void TargetSchedModel::init(const MCSchedModel &sm,
+                            const TargetSubtargetInfo *sti,
+                            const TargetInstrInfo *tii) {
+  SchedModel = sm;
+  STI = sti;
+  TII = tii;
+  STI->initInstrItins(InstrItins);
+}
diff --git a/llvm/lib/MC/MCSubtargetInfo.cpp b/llvm/lib/MC/MCSubtargetInfo.cpp
index 98206596952..47735a492de 100644
--- a/llvm/lib/MC/MCSubtargetInfo.cpp
+++ b/llvm/lib/MC/MCSubtargetInfo.cpp
@@ -101,3 +101,9 @@ MCSubtargetInfo::getInstrItineraryForCPU(StringRef CPU) const {
   const MCSchedModel *SchedModel = getSchedModelForCPU(CPU);
   return InstrItineraryData(SchedModel, Stages, OperandCycles, ForwardingPaths);
 }
+
+/// Initialize an InstrItineraryData instance.
+void MCSubtargetInfo::initInstrItins(InstrItineraryData &InstrItins) const {
+  InstrItins =
+    InstrItineraryData(0, Stages, OperandCycles, ForwardingPaths);
+}