lib/Target/TargetMachine.cpp

   1 //===-- TargetMachine.cpp - General Target Information ---------------------==//
   2 //
   3 // This file describes the general parts of a Target machine.
   4 // This file also implements MachineCacheInfo.
   5 //
   6 //===----------------------------------------------------------------------===//
   7
   8 #include "llvm/Target/TargetMachine.h"
   9 #include "llvm/Target/MachineCacheInfo.h"
  10 #include "llvm/Type.h"
  11
  12 //---------------------------------------------------------------------------
  13 // class TargetMachine
  14 //
  15 // Purpose:
  16 //   Machine description.
  17 //
  18 //---------------------------------------------------------------------------
  19
  20
  21 // function TargetMachine::findOptimalStorageSize
  22 //
  23 // Purpose:
  24 //   This default implementation assumes that all sub-word data items use
  25 //   space equal to optSizeForSubWordData, and all other primitive data
  26 //   items use space according to the type.
  27 //
  28 unsigned TargetMachine::findOptimalStorageSize(const Type *Ty) const {
  29   // Round integral values smaller than SubWordDataSize up to SubWordDataSize
  30   if (Ty->isIntegral() &&
  31       Ty->getPrimitiveSize() < DataLayout.getSubWordDataSize())
  32     return DataLayout.getSubWordDataSize();
  33
  34   return DataLayout.getTypeSize(Ty);
  35 }
  36
  37
  38 //---------------------------------------------------------------------------
  39 // class MachineCacheInfo
  40 //
  41 // Purpose:
  42 //   Describes properties of the target cache architecture.
  43 //---------------------------------------------------------------------------
  44
  45 void MachineCacheInfo::Initialize() {
  46   numLevels = 2;
  47   cacheLineSizes.push_back(16);  cacheLineSizes.push_back(32);
  48   cacheSizes.push_back(1 << 15); cacheSizes.push_back(1 << 20);
  49   cacheAssoc.push_back(1);       cacheAssoc.push_back(4);
  50 }