[NVPTX] Add an NVPTX-specific TargetTransformInfo

Summary:
It currently only implements hasBranchDivergence, and will be extended
in later diffs.

Split from D6188.

Test Plan: make check-all

Reviewers: jholewinski

Reviewed By: jholewinski

Subscribers: llvm-commits, meheff, eliben, jholewinski

Differential Revision: http://reviews.llvm.org/D6195

llvm-svn: 221619

llvm/lib/Target/NVPTX/CMakeLists.txt

@@ -9,27 +9,28 @@ tablegen(LLVM NVPTXGenSubtargetInfo.inc -gen-subtarget)
 add_public_tablegen_target(NVPTXCommonTableGen)
 
 set(NVPTXCodeGen_sources
-  NVPTXFavorNonGenericAddrSpaces.cpp
-  NVPTXFrameLowering.cpp
-  NVPTXInstrInfo.cpp
-  NVPTXISelDAGToDAG.cpp
-  NVPTXISelLowering.cpp
-  NVPTXRegisterInfo.cpp
-  NVPTXSubtarget.cpp
-  NVPTXTargetMachine.cpp
-  NVPTXLowerAggrCopies.cpp
-  NVPTXutil.cpp
   NVPTXAllocaHoisting.cpp
   NVPTXAsmPrinter.cpp
-  NVPTXUtilities.cpp
-  NVVMReflect.cpp
-  NVPTXGenericToNVVM.cpp
   NVPTXAssignValidGlobalNames.cpp
-  NVPTXPrologEpilogPass.cpp
+  NVPTXFavorNonGenericAddrSpaces.cpp
-  NVPTXMCExpr.cpp
+  NVPTXFrameLowering.cpp
-  NVPTXReplaceImageHandles.cpp
+  NVPTXGenericToNVVM.cpp
+  NVPTXISelDAGToDAG.cpp
+  NVPTXISelLowering.cpp
   NVPTXImageOptimizer.cpp
+  NVPTXInstrInfo.cpp
+  NVPTXLowerAggrCopies.cpp
   NVPTXLowerStructArgs.cpp
+  NVPTXMCExpr.cpp
+  NVPTXPrologEpilogPass.cpp
+  NVPTXRegisterInfo.cpp
+  NVPTXReplaceImageHandles.cpp
+  NVPTXSubtarget.cpp
+  NVPTXTargetMachine.cpp
+  NVPTXTargetTransformInfo.cpp
+  NVPTXUtilities.cpp
+  NVPTXutil.cpp
+  NVVMReflect.cpp
   )
 
 add_llvm_target(NVPTXCodeGen ${NVPTXCodeGen_sources})

llvm/lib/Target/NVPTX/NVPTX.h

@@ -59,6 +59,7 @@ inline static const char *NVPTXCondCodeToString(NVPTXCC::CondCodes CC) {
   llvm_unreachable("Unknown condition code");
 }
 
+ImmutablePass *createNVPTXTargetTransformInfoPass(const NVPTXTargetMachine *TM);
 FunctionPass *
 createNVPTXISelDag(NVPTXTargetMachine &TM, llvm::CodeGenOpt::Level OptLevel);
 ModulePass *createNVPTXAssignValidGlobalNamesPass();

llvm/lib/Target/NVPTX/NVPTXTargetMachine.cpp

@@ -121,6 +121,14 @@ TargetPassConfig *NVPTXTargetMachine::createPassConfig(PassManagerBase &PM) {
   return PassConfig;
 }
 
+void NVPTXTargetMachine::addAnalysisPasses(PassManagerBase &PM) {
+  // Add first the target-independent BasicTTI pass, then our NVPTX pass. This
+  // allows the NVPTX pass to delegate to the target independent layer when
+  // appropriate.
+  PM.add(createBasicTargetTransformInfoPass(this));
+  PM.add(createNVPTXTargetTransformInfoPass(this));
+}
+
 void NVPTXPassConfig::addIRPasses() {
   // The following passes are known to not play well with virtual regs hanging
   // around after register allocation (which in our case, is *all* registers).

llvm/lib/Target/NVPTX/NVPTXTargetMachine.h

@@ -49,6 +49,9 @@ public:
     return true;
   }
 
+  /// \brief Register NVPTX analysis passes with a pass manager.
+  void addAnalysisPasses(PassManagerBase &PM) override;
+
 }; // NVPTXTargetMachine.
 
 class NVPTXTargetMachine32 : public NVPTXTargetMachine {

llvm/lib/Target/NVPTX/NVPTXTargetTransformInfo.cpp

@@ -0,0 +1,90 @@
+//===-- NVPTXTargetTransformInfo.cpp - NVPTX specific TTI pass ---------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// \file
+// This file implements a TargetTransformInfo analysis pass specific to the
+// NVPTX target machine. It uses the target's detailed information to provide
+// more precise answers to certain TTI queries, while letting the target
+// independent and default TTI implementations handle the rest.
+//
+//===----------------------------------------------------------------------===//
+
+#include "NVPTXTargetMachine.h"
+#include "llvm/Analysis/LoopInfo.h"
+#include "llvm/Analysis/TargetTransformInfo.h"
+#include "llvm/Analysis/ValueTracking.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Target/CostTable.h"
+#include "llvm/Target/TargetLowering.h"
+using namespace llvm;
+
+#define DEBUG_TYPE "NVPTXtti"
+
+// Declare the pass initialization routine locally as target-specific passes
+// don't have a target-wide initialization entry point, and so we rely on the
+// pass constructor initialization.
+namespace llvm {
+void initializeNVPTXTTIPass(PassRegistry &);
+}
+
+namespace {
+
+class NVPTXTTI final : public ImmutablePass, public TargetTransformInfo {
+  const NVPTXTargetMachine *TM;
+  const NVPTXSubtarget *ST;
+  const NVPTXTargetLowering *TLI;
+
+  /// Estimate the overhead of scalarizing an instruction. Insert and Extract
+  /// are set if the result needs to be inserted and/or extracted from vectors.
+  unsigned getScalarizationOverhead(Type *Ty, bool Insert, bool Extract) const;
+
+public:
+  NVPTXTTI() : ImmutablePass(ID), TM(nullptr), ST(nullptr), TLI(nullptr) {
+    llvm_unreachable("This pass cannot be directly constructed");
+  }
+
+  NVPTXTTI(const NVPTXTargetMachine *TM)
+      : ImmutablePass(ID), TM(TM), ST(TM->getSubtargetImpl()),
+        TLI(TM->getSubtargetImpl()->getTargetLowering()) {
+    initializeNVPTXTTIPass(*PassRegistry::getPassRegistry());
+  }
+
+  void initializePass() override { pushTTIStack(this); }
+
+  void getAnalysisUsage(AnalysisUsage &AU) const override {
+    TargetTransformInfo::getAnalysisUsage(AU);
+  }
+
+  /// Pass identification.
+  static char ID;
+
+  /// Provide necessary pointer adjustments for the two base classes.
+  void *getAdjustedAnalysisPointer(const void *ID) override {
+    if (ID == &TargetTransformInfo::ID)
+      return (TargetTransformInfo *)this;
+    return this;
+  }
+
+  bool hasBranchDivergence() const override;
+
+  /// @}
+};
+
+} // end anonymous namespace
+
+INITIALIZE_AG_PASS(NVPTXTTI, TargetTransformInfo, "NVPTXtti",
+                   "NVPTX Target Transform Info", true, true, false)
+char NVPTXTTI::ID = 0;
+
+ImmutablePass *
+llvm::createNVPTXTargetTransformInfoPass(const NVPTXTargetMachine *TM) {
+  return new NVPTXTTI(TM);
+}
+
+bool NVPTXTTI::hasBranchDivergence() const { return true; }