[PATCH] D96448: BPF: Implement TTI.IntImmCost() properly

[Yonghong Song via Phabricator via llvm-commits]

This revision was landed with ongoing or failed builds.
This revision was automatically updated to reflect the committed changes.
Closed by commit rGa260ae716030: BPF: Implement TTI.IntImmCost() properly (authored by yonghong-song).

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D96448/new/

https://reviews.llvm.org/D96448

Files:
  llvm/lib/Target/BPF/BPFTargetMachine.cpp
  llvm/lib/Target/BPF/BPFTargetMachine.h
  llvm/lib/Target/BPF/BPFTargetTransformInfo.h


Index: llvm/lib/Target/BPF/BPFTargetTransformInfo.h
===================================================================
--- /dev/null
+++ llvm/lib/Target/BPF/BPFTargetTransformInfo.h
@@ -0,0 +1,49 @@
+//===------ BPFTargetTransformInfo.h - BPF specific TTI ---------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file uses the target's specific information to
+// provide more precise answers to certain TTI queries, while letting the
+// target independent and default TTI implementations handle the rest.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_TARGET_BPF_BPFTARGETTRANSFORMINFO_H
+#define LLVM_LIB_TARGET_BPF_BPFTARGETTRANSFORMINFO_H
+
+#include "BPFTargetMachine.h"
+#include "llvm/Analysis/TargetTransformInfo.h"
+#include "llvm/CodeGen/BasicTTIImpl.h"
+
+namespace llvm {
+class BPFTTIImpl : public BasicTTIImplBase<BPFTTIImpl> {
+  typedef BasicTTIImplBase<BPFTTIImpl> BaseT;
+  typedef TargetTransformInfo TTI;
+  friend BaseT;
+
+  const BPFSubtarget *ST;
+  const BPFTargetLowering *TLI;
+
+  const BPFSubtarget *getST() const { return ST; }
+  const BPFTargetLowering *getTLI() const { return TLI; }
+
+public:
+  explicit BPFTTIImpl(const BPFTargetMachine *TM, const Function &F)
+      : BaseT(TM, F.getParent()->getDataLayout()), ST(TM->getSubtargetImpl(F)),
+        TLI(ST->getTargetLowering()) {}
+
+  int getIntImmCost(const APInt &Imm, Type *Ty, TTI::TargetCostKind CostKind) {
+    if (Imm.getBitWidth() <= 64 && isInt<32>(Imm.getSExtValue()))
+      return TTI::TCC_Free;
+
+    return TTI::TCC_Basic;
+  }
+};
+
+} // end namespace llvm
+
+#endif // LLVM_LIB_TARGET_BPF_BPFTARGETTRANSFORMINFO_H
Index: llvm/lib/Target/BPF/BPFTargetMachine.h
===================================================================
--- llvm/lib/Target/BPF/BPFTargetMachine.h
+++ llvm/lib/Target/BPF/BPFTargetMachine.h
@@ -34,6 +34,8 @@
 
   TargetPassConfig *createPassConfig(PassManagerBase &PM) override;
 
+  TargetTransformInfo getTargetTransformInfo(const Function &F) override;
+
   TargetLoweringObjectFile *getObjFileLowering() const override {
     return TLOF.get();
   }
Index: llvm/lib/Target/BPF/BPFTargetMachine.cpp
===================================================================
--- llvm/lib/Target/BPF/BPFTargetMachine.cpp
+++ llvm/lib/Target/BPF/BPFTargetMachine.cpp
@@ -12,6 +12,7 @@
 
 #include "BPFTargetMachine.h"
 #include "BPF.h"
+#include "BPFTargetTransformInfo.h"
 #include "MCTargetDesc/BPFMCAsmInfo.h"
 #include "TargetInfo/BPFTargetInfo.h"
 #include "llvm/CodeGen/Passes.h"
@@ -145,6 +146,11 @@
   TargetPassConfig::addIRPasses();
 }
 
+TargetTransformInfo
+BPFTargetMachine::getTargetTransformInfo(const Function &F) {
+  return TargetTransformInfo(BPFTTIImpl(this, F));
+}
+
 // Install an instruction selector pass using
 // the ISelDag to gen BPF code.
 bool BPFPassConfig::addInstSelector() {


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