[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
diff --git a/llvm/lib/Target/NVPTX/NVPTXTargetTransformInfo.cpp b/llvm/lib/Target/NVPTX/NVPTXTargetTransformInfo.cpp
new file mode 100644
index 0000000..b3a5b60
--- /dev/null
+++ b/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; }