lib/CodeGen/BasicTargetTransformInfo.cpp

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