text: /*===================== begin_copyright_notice ==================================
  
  Copyright (c) 2017 Intel Corporation
  
  Permission is hereby granted, free of charge, to any person obtaining a
  copy of this software and associated documentation files (the
  "Software"), to deal in the Software without restriction, including
  without limitation the rights to use, copy, modify, merge, publish,
  distribute, sublicense, and/or sell copies of the Software, and to
  permit persons to whom the Software is furnished to do so, subject to
  the following conditions:
  
  The above copyright notice and this permission notice shall be included
  in all copies or substantial portions of the Software.
  
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
  CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  
  
  ======================= end_copyright_notice ==================================*/
  
  #include "Compiler/Optimizer/OpenCLPasses/ImageFuncs/ImageFuncResolution.hpp"
  #include "Compiler/Optimizer/OpenCLPasses/ImageFuncs/ImageFuncsAnalysis.hpp"
  #include "Compiler/Optimizer/OCLBIUtils.h"
  #include "Compiler/IGCPassSupport.h"
  
  #include "common/LLVMWarningsPush.hpp"
  #include <llvmWrapper/IR/Function.h>
  #include <llvm/IR/Instructions.h>
  #include "common/LLVMWarningsPop.hpp"
  
  using namespace llvm;
  using namespace IGC;
  using namespace IGC::IGCMD;
  
  // Register pass to igc-opt
  #define PASS_FLAG "igc-image-func-resolution"
  #define PASS_DESCRIPTION "Resolves image height, width, depth functions"
  #define PASS_CFG_ONLY false
  #define PASS_ANALYSIS false
  IGC_INITIALIZE_PASS_BEGIN(ImageFuncResolution, PASS_FLAG, PASS_DESCRIPTION, PASS_CFG_ONLY, PASS_ANALYSIS)
  IGC_INITIALIZE_PASS_DEPENDENCY(MetaDataUtilsWrapper)
  IGC_INITIALIZE_PASS_DEPENDENCY(CodeGenContextWrapper)
  IGC_INITIALIZE_PASS_END(ImageFuncResolution, PASS_FLAG, PASS_DESCRIPTION, PASS_CFG_ONLY, PASS_ANALYSIS)
  
  char ImageFuncResolution::ID = 0;
  
  ImageFuncResolution::ImageFuncResolution() : FunctionPass(ID), m_implicitArgs()
  {
      initializeImageFuncResolutionPass(*PassRegistry::getPassRegistry());
  }
  
  bool ImageFuncResolution::runOnFunction(Function& F) {
      const MetaDataUtils* pMdUtils = getAnalysis<MetaDataUtilsWrapper>().getMetaDataUtils();
      m_implicitArgs = ImplicitArgs(F, pMdUtils);
      m_changed = false;
      visit(F);
      return m_changed;
  }
  
  void ImageFuncResolution::visitCallInst(CallInst& CI)
  {
      if (!CI.getCalledFunction())
      {
          return;
      }
  
      Value* imageRes = nullptr;
  
      // Add appropriate sequence and image dimension func
      StringRef funcName = CI.getCalledFunction()->getName();
  
      if (funcName.equals(ImageFuncsAnalysis::GET_IMAGE_HEIGHT))
      {
          imageRes = getImageHeight(CI);
      }
      else if (funcName.equals(ImageFuncsAnalysis::GET_IMAGE_WIDTH))
      {
          imageRes = getImageWidth(CI);
      }
      else if (funcName.equals(ImageFuncsAnalysis::GET_IMAGE_DEPTH))
      {
          imageRes = getImageDepth(CI);
      }
      else if (funcName.equals(ImageFuncsAnalysis::GET_IMAGE_NUM_MIP_LEVELS))
      {
          imageRes = getImageNumMipLevels(CI);
      }
      else if (funcName.equals(ImageFuncsAnalysis::GET_IMAGE_CHANNEL_DATA_TYPE))
      {
          imageRes = getImageChannelDataType(CI);
      }
      else if (funcName.equals(ImageFuncsAnalysis::GET_IMAGE_CHANNEL_ORDER))
      {
          imageRes = getImageChannelOrder(CI);
      }
      else if (funcName.equals(ImageFuncsAnalysis::GET_IMAGE_SRGB_CHANNEL_ORDER))
      {
          imageRes = getImplicitImageArg(CI, ImplicitArg::IMAGE_SRGB_CHANNEL_ORDER);
      }
      else if (funcName.equals(ImageFuncsAnalysis::GET_IMAGE_ARRAY_SIZE))
      {
          imageRes = getImageArraySize(CI);
      }
      else if (funcName.equals(ImageFuncsAnalysis::GET_IMAGE_NUM_SAMPLES))
      {
          imageRes = getImageNumSamples(CI);
      }
      else if (funcName.equals(ImageFuncsAnalysis::GET_SAMPLER_ADDRESS_MODE))
      {
          imageRes = getSamplerAddressMode(CI);
      }
      else if (funcName.equals(ImageFuncsAnalysis::GET_SAMPLER_NORMALIZED_COORDS))
      {
          imageRes = getSamplerNormalizedCoords(CI);
      }
      else if (funcName.equals(ImageFuncsAnalysis::GET_SAMPLER_SNAP_WA_REQUIRED))
      {
          imageRes = getSamplerSnapWARequired(CI);
      }
      else if (funcName.equals(ImageFuncsAnalysis::GET_FLAT_IMAGE_BASEOFFSET))
      {
          imageRes = getImplicitImageArg(CI, ImplicitArg::FLAT_IMAGE_BASEOFFSET);
      }
      else if (funcName.equals(ImageFuncsAnalysis::GET_FLAT_IMAGE_HEIGHT))
      {
          imageRes = getImplicitImageArg(CI, ImplicitArg::FLAT_IMAGE_HEIGHT);
      }
      else if (funcName.equals(ImageFuncsAnalysis::GET_FLAT_IMAGE_WIDTH))
      {
          imageRes = getImplicitImageArg(CI, ImplicitArg::FLAT_IMAGE_WIDTH);
      }
      else if (funcName.equals(ImageFuncsAnalysis::GET_FLAT_IMAGE_PITCH))
      {
          imageRes = getImplicitImageArg(CI, ImplicitArg::FLAT_IMAGE_PITCH);
      }
      else
      {
          // Non image function, do nothing
          return;
      }
  
      // Replace original image dim call instruction by the result of the appropriate sequence
      CI.replaceAllUsesWith(imageRes);
      CI.eraseFromParent();
      m_changed = true;
  }
  
  Value* ImageFuncResolution::getImageHeight(CallInst& CI)
  {
      Argument* arg = getImplicitImageArg(CI, ImplicitArg::IMAGE_HEIGHT);
      return arg;
  }
  
  Value* ImageFuncResolution::getImageWidth(CallInst& CI)
  {
      Argument* arg = getImplicitImageArg(CI, ImplicitArg::IMAGE_WIDTH);
      return arg;
  }
  
  Value* ImageFuncResolution::getImageDepth(CallInst& CI)
  {
      Argument* arg = getImplicitImageArg(CI, ImplicitArg::IMAGE_DEPTH);
      return arg;
  }
  
  Value* ImageFuncResolution::getImageNumMipLevels(CallInst& CI)
  {
      Argument* arg = getImplicitImageArg(CI, ImplicitArg::IMAGE_NUM_MIP_LEVELS);
      return arg;
  }
  
  Value* ImageFuncResolution::getImageChannelDataType(CallInst& CI)
  {
      Argument* arg = getImplicitImageArg(CI, ImplicitArg::IMAGE_CHANNEL_DATA_TYPE);
      return arg;
  }
  
  Value* ImageFuncResolution::getImageChannelOrder(CallInst& CI)
  {
      Argument* arg = getImplicitImageArg(CI, ImplicitArg::IMAGE_CHANNEL_ORDER);
      return arg;
  }
  
  Value* ImageFuncResolution::getImageArraySize(CallInst& CI)
  {
      Argument* arg = getImplicitImageArg(CI, ImplicitArg::IMAGE_ARRAY_SIZE);
      return arg;
  }
  
  Value* ImageFuncResolution::getImageNumSamples(CallInst& CI)
  {
      Argument* arg = getImplicitImageArg(CI, ImplicitArg::IMAGE_NUM_SAMPLES);
      return arg;
  }
  
  Value* ImageFuncResolution::getSamplerAddressMode(CallInst& CI)
  {
      MetaDataUtils* pMdUtils = getAnalysis<MetaDataUtilsWrapper>().getMetaDataUtils();
      ModuleMetaData* modMD = getAnalysis<MetaDataUtilsWrapper>().getModuleMetaData();
  
      Value* sampler = CImagesBI::CImagesUtils::traceImageOrSamplerArgument(&CI, 0, pMdUtils, modMD);
      assert(sampler != nullptr && "Sampler untraceable for ImplicitArg::SAMPLER_ADDRESS");
      if (isa<Argument>(sampler))
      {
          Argument* arg = getImplicitImageArg(CI, ImplicitArg::SAMPLER_ADDRESS);
          return arg;
      }
      else
      {
          llvm::Function* pFunc = CI.getParent()->getParent();
  
          assert(isa<ConstantInt>(sampler) && "Sampler must be a constant integer");
          InlineSamplerState samplerStateAddressMode{ cast<ConstantInt>(sampler)->getZExtValue() };
          uint64_t samplerVal = 0;
          uint samplerValue = int_cast<unsigned int>(cast<ConstantInt>(sampler)->getZExtValue());
          if (modMD->FuncMD.find(pFunc) != modMD->FuncMD.end())
          {
              FunctionMetaData funcMD = modMD->FuncMD[pFunc];
              ResourceAllocMD resAllocMD = funcMD.resAllocMD;
              for (auto i = resAllocMD.inlineSamplersMD.begin(), e = resAllocMD.inlineSamplersMD.end(); i != e; i++)
              {
                  IGC::InlineSamplersMD inlineSamplerMD = *i;
                  if (samplerValue == inlineSamplerMD.m_Value)
                  {
                      InlineSamplerState samplerState{ static_cast<uint64_t>(samplerValue) };
                      samplerVal = inlineSamplerMD.addressMode;
                  }
              }
          }
          return ConstantInt::get(CI.getType(), samplerVal);
      }
  }
  
  Value* ImageFuncResolution::getSamplerNormalizedCoords(CallInst& CI)
  {
      MetaDataUtils* pMdUtils = getAnalysis<MetaDataUtilsWrapper>().getMetaDataUtils();
      ModuleMetaData* modMD = getAnalysis<MetaDataUtilsWrapper>().getModuleMetaData();
      Value* sampler = CImagesBI::CImagesUtils::traceImageOrSamplerArgument(&CI, 0, pMdUtils, modMD);
      if (sampler == nullptr)
      {
          // TODO: For now disable WA if unable to trace sampler argument.
          // Will need to rework WA to add support for indirect sampler case.
          return ConstantInt::get(CI.getType(), 0);
      }
      else if (isa<Argument>(sampler))
      {
          Argument* arg = getImplicitImageArg(CI, ImplicitArg::SAMPLER_NORMALIZED);
          return arg;
      }
      else
      {
          llvm::Function* pFunc = CI.getParent()->getParent();
          assert(isa<ConstantInt>(sampler) && "Sampler must be a constant integer");
  
          uint64_t samplerVal = 0;
          uint samplerValue = int_cast<unsigned int>(cast<ConstantInt>(sampler)->getZExtValue());
  
          if (modMD->FuncMD.find(pFunc) != modMD->FuncMD.end())
          {
              FunctionMetaData funcMD = modMD->FuncMD[pFunc];
              ResourceAllocMD resAllocMD = funcMD.resAllocMD;
              for (auto i = resAllocMD.inlineSamplersMD.begin(), e = resAllocMD.inlineSamplersMD.end(); i != e; ++i)
              {
                  IGC::InlineSamplersMD inlineSamplerMD = *i;
                  if (samplerValue == inlineSamplerMD.m_Value)
                  {
                      InlineSamplerState samplerState{ static_cast<uint64_t>(samplerValue) };
                      samplerVal = inlineSamplerMD.NormalizedCoords;
                  }
              }
          }
          return ConstantInt::get(CI.getType(), samplerVal);
      }
  }
  
  Value* ImageFuncResolution::getSamplerSnapWARequired(CallInst& CI)
  {
      MetaDataUtils* pMdUtils = getAnalysis<MetaDataUtilsWrapper>().getMetaDataUtils();
      ModuleMetaData* modMD = getAnalysis<MetaDataUtilsWrapper>().getModuleMetaData();
      Value* sampler = CImagesBI::CImagesUtils::traceImageOrSamplerArgument(&CI, 0, pMdUtils, modMD);
      if (sampler == nullptr)
      {
          // TODO: For now disable WA if unable to trace sampler argument.
          // Will need to rework WA to add support for indirect sampler case.
          return ConstantInt::get(CI.getType(), 0);
      }
      else if (isa<Argument>(sampler))
      {
          Argument* arg = getImplicitImageArg(CI, ImplicitArg::SAMPLER_SNAP_WA);
          return arg;
      }
      else
      {
          assert(isa<ConstantInt>(sampler) && "Sampler must be a constant integer");
  
          llvm::Function* pFunc = CI.getParent()->getParent();
  
          bool snapWARequired = false;
          uint samplerVal = int_cast<unsigned int>(cast<ConstantInt>(sampler)->getZExtValue());
  
          if (modMD->FuncMD.find(pFunc) != modMD->FuncMD.end())
          {
              FunctionMetaData funcMD = modMD->FuncMD[pFunc];
              ResourceAllocMD resAllocMD = funcMD.resAllocMD;
              for (auto i = resAllocMD.inlineSamplersMD.begin(), e = resAllocMD.inlineSamplersMD.end(); i != e; ++i)
              {
                  InlineSamplersMD inlineSamplerMD = *i;
                  if (samplerVal == inlineSamplerMD.m_Value)
                  {
                      InlineSamplerState samplerState{ static_cast<uint64_t>(samplerVal) };
                      bool anyAddressModeClamp =
                          inlineSamplerMD.TCXAddressMode == iOpenCL::SAMPLER_TEXTURE_ADDRESS_MODE_BORDER ||
                          inlineSamplerMD.TCYAddressMode == iOpenCL::SAMPLER_TEXTURE_ADDRESS_MODE_BORDER ||
                          inlineSamplerMD.TCZAddressMode == iOpenCL::SAMPLER_TEXTURE_ADDRESS_MODE_BORDER;
                      bool anyMapFilterModeNearest =
                          inlineSamplerMD.MagFilterType == iOpenCL::SAMPLER_MAPFILTER_POINT ||
                          inlineSamplerMD.MinFilterType == iOpenCL::SAMPLER_MAPFILTER_POINT;
                      snapWARequired = anyAddressModeClamp &&
                          anyMapFilterModeNearest &&
                          !inlineSamplerMD.NormalizedCoords;
                  }
              }
          }
          return ConstantInt::get(CI.getType(), snapWARequired ? -1 : 0);
      }
  }
  
  Argument* ImageFuncResolution::getImplicitImageArg(CallInst& CI, ImplicitArg::ArgType argType) {
      // Only images that are arguments are supported!
      Argument* image = cast<Argument>(CImagesBI::CImagesUtils::traceImageOrSamplerArgument(&CI, 0));
  
      unsigned int numImplicitArgs = m_implicitArgs.size();
      unsigned int implicitArgIndex = m_implicitArgs.getImageArgIndex(argType, image);
  
      Function* pFunc = CI.getParent()->getParent();
      unsigned int implicitArgIndexInFunc = IGCLLVM::GetFuncArgSize(pFunc) - numImplicitArgs + implicitArgIndex;
  
      Function::arg_iterator arg = pFunc->arg_begin();
      for (unsigned int i = 0; i < implicitArgIndexInFunc; ++i, ++arg);
  
      return &(*arg);
  }
  