llvm/lib/CodeGen/BasicTargetTransformInfo.cpp

   1 //===- BasicTargetTransformInfo.cpp - Basic target-independent TTI impl ---===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 /// \file
   9 /// This file provides the implementation of a basic TargetTransformInfo pass
  10 /// predicated on the target abstractions present in the target independent
  11 /// code generator. It uses these (primarily TargetLowering) to model as much
  12 /// of the TTI query interface as possible. It is included by most targets so
  13 /// that they can specialize only a small subset of the query space.
  14 ///
  15 //===----------------------------------------------------------------------===//
  16
  17 #include "llvm/CodeGen/BasicTTIImpl.h"
  18 #include "llvm/CodeGen/TargetSubtargetInfo.h"
  19 #include "llvm/IR/Function.h"
  20 #include "llvm/Support/CommandLine.h"
  21 #include "llvm/Target/TargetMachine.h"
  22
  23 using namespace llvm;
  24
  25 // This flag is used by the template base class for BasicTTIImpl, and here to
  26 // provide a definition.
  27 cl::opt<unsigned>
  28 llvm::PartialUnrollingThreshold("partial-unrolling-threshold", cl::init(0),
  29                                 cl::desc("Threshold for partial unrolling"),
  30                                 cl::Hidden);
  31
  32 BasicTTIImpl::BasicTTIImpl(const TargetMachine *TM, const Function &F)
  33     : BaseT(TM, F.getParent()->getDataLayout()), ST(TM->getSubtargetImpl(F)),
  34       TLI(ST->getTargetLowering()) {}