XeVMToLLVM.cpp

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//===-- XeVMToLLVM.cpp - XeVM to LLVM dialect conversion --------*- C++ -*-===//
//
// This file is licensed 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
//
//===----------------------------------------------------------------------===//
 
#include "mlir/Conversion/XeVMToLLVM/XeVMToLLVM.h"
 
#include "mlir/Conversion/ConvertToLLVM/ToLLVMInterface.h"
#include "mlir/Conversion/LLVMCommon/Pattern.h"
#include "mlir/Dialect/LLVMIR/FunctionCallUtils.h"
#include "mlir/Dialect/LLVMIR/LLVMDialect.h"
#include "mlir/Dialect/LLVMIR/XeVMDialect.h"
#include "mlir/Pass/Pass.h"
#include "mlir/Support/LLVM.h"
#include "llvm/Support/FormatVariadic.h"
 
#include "mlir/IR/BuiltinTypes.h"
#include "mlir/IR/Types.h"
 
#include "llvm/ADT/TypeSwitch.h"
 
namespace mlir {
#define GEN_PASS_DEF_CONVERTXEVMTOLLVMPASS
#include "mlir/Conversion/Passes.h.inc"
} // namespace mlir
 
using namespace mlir;
using namespace xevm;
 
namespace {
 
struct LLVMFuncAttributeOptions {
  bool isConvergent = false;
  bool isNoUnwind = false;
  bool isWillReturn = false;
  LLVM::MemoryEffectsAttr memEffectsAttr{};
};
static constexpr LLVMFuncAttributeOptions noUnwindAttrs = {
    false, true, false, {}};
static constexpr LLVMFuncAttributeOptions noUnwindWillReturnAttrs = {
    false, true, true, {}};
static constexpr LLVMFuncAttributeOptions convergentNoUnwindWillReturnAttrs = {
    true, true, true, {}};
 
std::string getTypeMangling(Type ty, bool isUnsigned = false) {
  return TypeSwitch<Type, std::string>(ty)
      .Case([isUnsigned](VectorType ty) -> std::string {
        return "Dv" + std::to_string(ty.getNumElements()) + "_" +
               getTypeMangling(ty.getElementType(), isUnsigned);
      })
      .Case([](Float16Type) -> std::string { return "Dh"; })
      .Case([](Float32Type) -> std::string { return "f"; })
      .Case([](Float64Type) -> std::string { return "d"; })
      .Case([isUnsigned](IntegerType ty) -> std::string {
        switch (ty.getWidth()) {
        case 8:
          return isUnsigned ? "h" : "c";
        case 16:
          return isUnsigned ? "t" : "s";
        case 32:
          return isUnsigned ? "j" : "i";
        case 64:
          return isUnsigned ? "m" : "l";
        default:
          llvm_unreachable("unhandled integer type");
        }
      })
      .Default([](Type) -> std::string {
        llvm_unreachable("unhandled type for mangling");
      });
}
 
std::string mangle(StringRef baseName, ArrayRef<Type> types,
                   ArrayRef<bool> isUnsigned = {}) {
  assert((isUnsigned.empty() || isUnsigned.size() == types.size()) &&
         "Signedness info doesn't match");
  std::string s;
  llvm::raw_string_ostream os(s);
  llvm::SmallDenseMap<Type, unsigned> substitutions;
  os << "_Z" << baseName.size() << baseName;
  for (auto [idx, type] : llvm::enumerate(types)) {
    auto it = substitutions.find(type);
    if (it != substitutions.end()) {
      os << "S";
      // First substitution is `S_`, second is `S0_`, and so on.
      if (unsigned firstIdx = it->getSecond(); firstIdx > 0)
        os << firstIdx - 1;
      os << "_";
    } else {
      if (!type.isIntOrFloat())
        substitutions[type] = substitutions.size();
      os << getTypeMangling(type, isUnsigned.empty() ? false : isUnsigned[idx]);
    }
  }
  return os.str();
}
 
template <bool isLoad, typename OpType>
int32_t getL1CacheControl(OpType op) {
  int32_t control = 0;
  if constexpr (isLoad) {
    switch (*op.getCacheControl()) {
    case LoadCacheControl::L1UC_L2UC_L3UC:
    case LoadCacheControl::L1UC_L2UC_L3C:
    case LoadCacheControl::L1UC_L2C_L3UC:
    case LoadCacheControl::L1UC_L2C_L3C:
      control = 1;
      break;
    case LoadCacheControl::L1C_L2UC_L3UC:
    case LoadCacheControl::L1C_L2UC_L3C:
    case LoadCacheControl::L1C_L2C_L3UC:
    case LoadCacheControl::L1C_L2C_L3C:
      control = 2;
      break;
    case LoadCacheControl::L1S_L2UC_L3UC:
    case LoadCacheControl::L1S_L2UC_L3C:
    case LoadCacheControl::L1S_L2C_L3UC:
    case LoadCacheControl::L1S_L2C_L3C:
      control = 3;
      break;
    case LoadCacheControl::INVALIDATE_READ:
      control = 4;
      break;
    }
  } else {
    switch (*op.getCacheControl()) {
    case StoreCacheControl::L1UC_L2UC_L3UC:
    case StoreCacheControl::L1UC_L2UC_L3WB:
    case StoreCacheControl::L1UC_L2WB_L3UC:
    case StoreCacheControl::L1UC_L2WB_L3WB:
      control = 1;
      break;
    case StoreCacheControl::L1WT_L2UC_L3UC:
    case StoreCacheControl::L1WT_L2UC_L3WB:
    case StoreCacheControl::L1WT_L2WB_L3UC:
    case StoreCacheControl::L1WT_L2WB_L3WB:
      control = 2;
      break;
    case StoreCacheControl::L1S_L2UC_L3UC:
    case StoreCacheControl::L1S_L2UC_L3WB:
    case StoreCacheControl::L1S_L2WB_L3UC:
    case StoreCacheControl::L1S_L2WB_L3WB:
      control = 3;
      break;
    case StoreCacheControl::L1WB_L2UC_L3UC:
    case StoreCacheControl::L1WB_L2WB_L3UC:
    case StoreCacheControl::L1WB_L2UC_L3WB:
      control = 4;
      break;
    }
  }
  return control;
}
 
template <bool isLoad, typename OpType>
int32_t getL3CacheControl(OpType op) {
  int32_t control = 0;
  if constexpr (isLoad) {
    switch (*op.getCacheControl()) {
    case LoadCacheControl::L1UC_L2UC_L3UC:
    case LoadCacheControl::L1UC_L2C_L3UC:
    case LoadCacheControl::L1C_L2UC_L3UC:
    case LoadCacheControl::L1C_L2C_L3UC:
    case LoadCacheControl::L1S_L2UC_L3UC:
    case LoadCacheControl::L1S_L2C_L3UC:
      control = 1;
      break;
    case LoadCacheControl::L1UC_L2UC_L3C:
    case LoadCacheControl::L1UC_L2C_L3C:
    case LoadCacheControl::L1C_L2UC_L3C:
    case LoadCacheControl::L1C_L2C_L3C:
    case LoadCacheControl::L1S_L2UC_L3C:
    case LoadCacheControl::L1S_L2C_L3C:
      control = 2;
      break;
    case LoadCacheControl::INVALIDATE_READ:
      control = 4;
      break;
    }
  } else {
    switch (*op.getCacheControl()) {
    case StoreCacheControl::L1UC_L2UC_L3UC:
    case StoreCacheControl::L1UC_L2WB_L3UC:
    case StoreCacheControl::L1WT_L2UC_L3UC:
    case StoreCacheControl::L1WT_L2WB_L3UC:
    case StoreCacheControl::L1S_L2UC_L3UC:
    case StoreCacheControl::L1S_L2WB_L3UC:
    case StoreCacheControl::L1WB_L2UC_L3UC:
    case StoreCacheControl::L1WB_L2WB_L3UC:
      control = 1;
      break;
    case StoreCacheControl::L1UC_L2UC_L3WB:
    case StoreCacheControl::L1UC_L2WB_L3WB:
    case StoreCacheControl::L1WT_L2UC_L3WB:
    case StoreCacheControl::L1WT_L2WB_L3WB:
    case StoreCacheControl::L1S_L2UC_L3WB:
    case StoreCacheControl::L1S_L2WB_L3WB:
    case StoreCacheControl::L1WB_L2UC_L3WB:
      control = 2;
      break;
    }
  }
  return control;
}
 
template <bool isLoad, typename OpType>
static std::optional<ArrayAttr>
getCacheControlMetadata(ConversionPatternRewriter &rewriter, OpType op) {
  if (!op.getCacheControl())
    return {};
  constexpr int32_t decorationCacheControlArity{4};
  constexpr int32_t loadCacheControlKey{6442};
  constexpr int32_t storeCacheControlKey{6443};
  const int32_t controlKey{isLoad ? loadCacheControlKey : storeCacheControlKey};
  SmallVector<int32_t, decorationCacheControlArity> decorationsL1{
      controlKey, 0, getL1CacheControl<isLoad, OpType>(op), 0};
  SmallVector<int32_t, decorationCacheControlArity> decorationsL3{
      controlKey, 1, getL3CacheControl<isLoad, OpType>(op), 0};
  auto arrayAttrL1 = rewriter.getI32ArrayAttr(decorationsL1);
  auto arrayAttrL3 = rewriter.getI32ArrayAttr(decorationsL3);
 
  SmallVector<Attribute, 2> combinedAttrs = {arrayAttrL1, arrayAttrL3};
  return rewriter.getArrayAttr(combinedAttrs);
}
 
static LLVM::CallOp createDeviceFunctionCall(
    ConversionPatternRewriter &rewriter, StringRef funcName, Type retType,
    ArrayRef<Type> argTypes, ArrayRef<Value> args,
    mlir::ArrayRef<std::pair<unsigned, mlir::StringRef>> paramAttrs,
    LLVMFuncAttributeOptions funcAttributeOptions, Operation *op) {
  auto moduleOp = op->getParentWithTrait<OpTrait::SymbolTable>();
  assert(moduleOp && "Expecting module");
  Location loc = op->getLoc();
 
  auto funcOpRes =
      LLVM::lookupOrCreateFn(rewriter, moduleOp, funcName, argTypes, retType);
  assert(!failed(funcOpRes));
  LLVM::LLVMFuncOp funcOp = funcOpRes.value();
  funcOp.setCConv(LLVM::cconv::CConv::SPIR_FUNC);
  funcOp.setConvergent(funcAttributeOptions.isConvergent);
  funcOp.setNoUnwind(funcAttributeOptions.isNoUnwind);
  funcOp.setWillReturn(funcAttributeOptions.isWillReturn);
 
  if (funcAttributeOptions.memEffectsAttr)
    funcOp.setMemoryEffectsAttr(funcAttributeOptions.memEffectsAttr);
 
  for (auto [idx, attrName] : paramAttrs)
    funcOp.setArgAttr(idx, attrName, rewriter.getUnitAttr());
 
  auto callOp = LLVM::CallOp::create(rewriter, loc, funcOp, args);
  callOp->setAttrs(funcOp->getAttrs());
 
  return callOp;
}
 
class MMAToOCLPattern : public OpConversionPattern<xevm::MMAOp> {
  using OpConversionPattern::OpConversionPattern;
  LogicalResult
  matchAndRewrite(xevm::MMAOp op, xevm::MMAOp::Adaptor adaptor,
                  ConversionPatternRewriter &rewriter) const override {
    if (!op.getC()) {
      return rewriter.notifyMatchFailure(op, "OCL requires C operand");
    }
    auto precisionA = op.getTypes().getA();
    auto precisionB = op.getTypes().getB();
    auto precisionC = op.getTypes().getC();
    auto precisionD = op.getTypes().getD();
    if (precisionC != precisionD) {
      return rewriter.notifyMatchFailure(op, "type of C and D need to match");
    }
    if (precisionC != xevm::ElemType::S32 &&
        precisionC != xevm::ElemType::F32 &&
        precisionC != xevm::ElemType::F16 &&
        precisionC != xevm::ElemType::BF16) {
      return rewriter.notifyMatchFailure(
          op, "type of C and D must be S32, F32, F16 or BF16");
    }
    if (precisionA == xevm::ElemType::S32 ||
        precisionA == xevm::ElemType::F32) {
      return rewriter.notifyMatchFailure(op, "type of A cannot be S32 or F32");
    }
    if (precisionB == xevm::ElemType::S32 ||
        precisionB == xevm::ElemType::F32) {
      return rewriter.notifyMatchFailure(op, "type of B cannot be S32 or F32");
    }
    constexpr uint32_t bitWidthPackedA{16};
    constexpr uint32_t bitWidthPackedB{32};
    auto loc = op.getLoc();
 
    auto castIfNeeded = [&](Value val, Type packedType) -> Value {
      VectorType origTy = cast<VectorType>(val.getType());
      const uint32_t vecBitSize =
          origTy.getNumElements() *
          origTy.getElementType().getIntOrFloatBitWidth();
      VectorType newTy = VectorType::get(
          vecBitSize / packedType.getIntOrFloatBitWidth(), packedType);
      if (origTy != newTy)
        val = LLVM::BitcastOp::create(rewriter, loc, newTy, val);
      return val;
    };
 
    Value a = op.getA();
    Type packedAType = (op.getTypes().getA() == xevm::ElemType::TF32)
                           ? cast<Type>(rewriter.getF32Type())
                           : rewriter.getIntegerType(bitWidthPackedA);
    a = castIfNeeded(a, packedAType);
 
    Value b = op.getB();
    Type packedBType = (op.getTypes().getB() == xevm::ElemType::TF32)
                           ? cast<Type>(rewriter.getF32Type())
                           : rewriter.getIntegerType(bitWidthPackedB);
    b = castIfNeeded(b, packedBType);
 
    Value c = op.getC();
    VectorType cOrigTy = cast<VectorType>(c.getType());
    VectorType resOrigTy = cast<VectorType>(op->getResultTypes()[0]);
    assert(cOrigTy == resOrigTy && "Accumulator and result type mismatch");
    // OCL builtins encode bfloat16 as int16
    VectorType cTy =
        cOrigTy.getElementType().isBF16()
            ? VectorType::get(cOrigTy.getShape(), rewriter.getIntegerType(16))
            : cOrigTy;
    VectorType resTy = cTy;
    if (cOrigTy != cTy)
      c = LLVM::BitcastOp::create(rewriter, loc, cTy, c);
 
    constexpr int32_t systolicDepth{8};
    std::string fnName =
        llvm::formatv("intel_sub_group_{0}_{1}_matrix_mad_k{2}",
                      stringifyElemType(op.getTypes().getA()).str(),
                      stringifyElemType(op.getTypes().getB()).str(),
                      systolicDepth *
                          getNumOperandsPerDword(op.getTypes().getA()))
            .str();
    SmallVector<Type> argTypes{a.getType(), b.getType(), cTy};
    fnName = mangle(fnName, argTypes);
    SmallVector<Value> args{a, b, c};
 
    auto memAttr = rewriter.getAttr<LLVM::MemoryEffectsAttr>(
        /*other=*/LLVM::ModRefInfo::NoModRef,
        /*argMem=*/LLVM::ModRefInfo::NoModRef,
        /*inaccessibleMem=*/LLVM::ModRefInfo::NoModRef);
    auto funcAttrs = convergentNoUnwindWillReturnAttrs;
    funcAttrs.memEffectsAttr = memAttr;
    Value result =
        createDeviceFunctionCall(rewriter, fnName, resTy, argTypes, args, {},
                                 funcAttrs, op.getOperation())
            ->getResult(0);
 
    if (resOrigTy != resTy)
      result = LLVM::BitcastOp::create(rewriter, loc, resOrigTy, result);
 
    rewriter.replaceOp(op, result);
    return success();
  }
 
private:
  static unsigned getNumOperandsPerDword(xevm::ElemType pTy) {
    switch (pTy) {
    case xevm::ElemType::TF32:
      return 1;
    case xevm::ElemType::BF16:
    case xevm::ElemType::F16:
      return 2;
    case xevm::ElemType::U8:
    case xevm::ElemType::S8:
      return 4;
    default:
      llvm_unreachable("unsupported xevm::ElemType");
    }
  }
};
 
class PrefetchToOCLPattern : public OpConversionPattern<PrefetchOp> {
  using OpConversionPattern::OpConversionPattern;
  LogicalResult
  matchAndRewrite(PrefetchOp op, PrefetchOp::Adaptor adaptor,
                  ConversionPatternRewriter &rewriter) const override {
    auto loc = op.getLoc();
    const std::string fnName{"_Z8prefetchPU3AS1Kcm"};
    Value one =
        LLVM::ConstantOp::create(rewriter, loc, rewriter.getI64Type(), 1);
    SmallVector<Value> args{op.getPtr(), one};
    SmallVector<Type> argTypes;
    for (auto arg : args)
      argTypes.push_back(arg.getType());
    auto funcAttr = noUnwindAttrs;
    auto memAttr = rewriter.getAttr<LLVM::MemoryEffectsAttr>(
        /*other=*/LLVM::ModRefInfo::NoModRef,
        /*argMem=*/LLVM::ModRefInfo::Ref,
        /*inaccessibleMem=*/LLVM::ModRefInfo::NoModRef);
    funcAttr.memEffectsAttr = memAttr;
 
    LLVM::CallOp call = createDeviceFunctionCall(
        rewriter, fnName, LLVM::LLVMVoidType::get(rewriter.getContext()),
        argTypes, args, {}, funcAttr, op.getOperation());
    if (std::optional<ArrayAttr> optCacheControls =
            getCacheControlMetadata<true>(rewriter, op))
      call->setAttr(XeVMDialect::getCacheControlsAttrName(), *optCacheControls);
    rewriter.eraseOp(op);
    return success();
  }
};
 
class MemfenceToOCLPattern : public OpConversionPattern<MemfenceOp> {
  using OpConversionPattern::OpConversionPattern;
  LogicalResult
  matchAndRewrite(MemfenceOp op, MemfenceOp::Adaptor adaptor,
                  ConversionPatternRewriter &rewriter) const override {
    auto loc = op.getLoc();
    const std::string fnName{"atomic_work_item_fence"};
    int memScope, addrSpace;
    switch (op.getAddrspace()) {
    case xevm::AddrSpace::SHARED:
      addrSpace = 1; // CLK_LOCAL_MEM_FENCE
      break;
    case xevm::AddrSpace::GLOBAL:
      addrSpace = 2; // CLK_GLOBAL_MEM_FENCE
      break;
    default:
      // GENERIC is not supported in OpenCL
      return rewriter.notifyMatchFailure(
          op, "Fence only supports global and shared address spaces.");
    }
    switch (op.getScope()) {
    case xevm::MemScope::WORKGROUP:
      memScope = 1;
      break;
    case xevm::MemScope::DEVICE:
      memScope = 2;
      break;
    default:
      // CLUSTER and SYSTEM are not supported in OpenCL
      return rewriter.notifyMatchFailure(
          op, "Fence only supports workgroup and device memory scopes.");
    }
    Type i32Type = rewriter.getI32Type();
    Value acqRel = LLVM::ConstantOp::create(rewriter, loc, i32Type, 4);
    Value memScopeConst =
        LLVM::ConstantOp::create(rewriter, loc, i32Type, memScope);
    Value addrSpaceConst =
        LLVM::ConstantOp::create(rewriter, loc, i32Type, addrSpace);
    SmallVector<Value> args{addrSpaceConst, acqRel, memScopeConst};
    SmallVector<Type> argTypes{3, i32Type};
    createDeviceFunctionCall(rewriter, mangle(fnName, argTypes),
                             LLVM::LLVMVoidType::get(rewriter.getContext()),
                             argTypes, args, {}, noUnwindAttrs,
                             op.getOperation());
    rewriter.eraseOp(op);
    return success();
  }
};
template <typename OpType>
class LoadStorePrefetchToOCLPattern : public OpConversionPattern<OpType> {
  using OpConversionPattern<OpType>::OpConversionPattern;
  LogicalResult
  matchAndRewrite(OpType op, typename OpType::Adaptor adaptor,
                  ConversionPatternRewriter &rewriter) const override {
    constexpr bool isLoad = std::is_same_v<OpType, BlockLoad2dOp>;
    constexpr bool isPrefetch = std::is_same_v<OpType, BlockPrefetch2dOp>;
 
    auto loc = op.getLoc();
    VectorType vecType;
    bool packReg = false;
    bool transpose = false;
    if constexpr (isLoad) {
      vecType = op.getRes().getType();
      packReg = op.getPackRegister();
      transpose = op.getTranspose();
    } else if constexpr (!isPrefetch) {
      vecType = op.getStoredVal().getType();
    }
 
    auto i32Type = rewriter.getI32Type();
    Value byteCoord =
        LLVM::UndefOp::create(rewriter, loc, VectorType::get(2, i32Type));
    Value zero = LLVM::ConstantOp::create(rewriter, loc, i32Type, 0);
    Value one = LLVM::ConstantOp::create(rewriter, loc, i32Type, 1);
    byteCoord = LLVM::InsertElementOp::create(
        rewriter, loc, VectorType::get(2, i32Type), byteCoord, op.getX(), zero);
    byteCoord = LLVM::InsertElementOp::create(
        rewriter, loc, VectorType::get(2, i32Type), byteCoord, op.getY(), one);
    SmallVector<Value> args{op.getPtr(), op.getBaseWidth(), op.getBaseHeight(),
                            op.getBasePitch(), byteCoord};
    SmallVector<Type> retTypes;
    Value spvLoadDstPtr;
    std::string funcName{"intel_sub_group_2d_block_"};
    std::string bitWidthId;
    LLVMFuncAttributeOptions funcAttr{noUnwindWillReturnAttrs};
    SmallVector<std::pair<unsigned, StringRef>, 4> paramAttrs;
    if constexpr (isPrefetch) { // Prefetch
      funcName += "prefetch";
      paramAttrs = {std::make_pair(0, LLVM::LLVMDialect::getNonNullAttrName())};
      auto memAttr = rewriter.getAttr<LLVM::MemoryEffectsAttr>(
          /*other=*/LLVM::ModRefInfo::NoModRef,
          /*argMem=*/LLVM::ModRefInfo::Ref,
          /*inaccessibleMem=*/LLVM::ModRefInfo::NoModRef);
      funcAttr = noUnwindAttrs;
      funcAttr.memEffectsAttr = memAttr;
    } else {
      auto vecElemType = vecType.getElementType();
      auto vecElemBitWidth = vecElemType.getIntOrFloatBitWidth();
      Value numElems = LLVM::ConstantOp::create(rewriter, loc, i32Type,
                                                vecType.getNumElements());
      auto dstOrSrcPtr = LLVM::AllocaOp::create(
          rewriter, loc, LLVM::LLVMPointerType::get(rewriter.getContext()),
          vecElemType, numElems);
      args.push_back(dstOrSrcPtr);
      if constexpr (isLoad) { // Load
        funcName += "read";
        bitWidthId = getTypeMangling(vecElemType, /*isUnsigned=*/true);
        if (packReg)
          funcName += "_transform";
        else if (transpose)
          funcName += "_transpose";
        spvLoadDstPtr = dstOrSrcPtr;
        retTypes.push_back(vecType);
        paramAttrs = {
            std::make_pair(0, LLVM::LLVMDialect::getNonNullAttrName()),
            std::make_pair(0, LLVM::LLVMDialect::getReadonlyAttrName()),
            std::make_pair(5, LLVM::LLVMDialect::getNonNullAttrName()),
            std::make_pair(5, LLVM::LLVMDialect::getWriteOnlyAttrName()),
        };
      } else { // Store
        funcName += "write";
        bitWidthId = (vecElemBitWidth == 32)
                         ? "j"
                         : ((vecElemBitWidth == 16) ? "t" : "h");
        LLVM::StoreOp::create(rewriter, loc, op.getStoredVal(), dstOrSrcPtr);
        paramAttrs = {
            std::make_pair(0, LLVM::LLVMDialect::getNonNullAttrName()),
            std::make_pair(0, LLVM::LLVMDialect::getWriteOnlyAttrName()),
            std::make_pair(5, LLVM::LLVMDialect::getNonNullAttrName()),
            std::make_pair(5, LLVM::LLVMDialect::getReadonlyAttrName()),
        };
      }
    }
 
    funcName =
        llvm::formatv("{0}_{1}b_{2}r{3}x{4}c", funcName, op.getElemSizeInBits(),
                      op.getTileHeight(), op.getTileWidth(), op.getVBlocks())
            .str();
    std::string prefetchCode("");
    if (!isPrefetch)
      prefetchCode += "P";
    funcName = llvm::formatv("_Z{0}{1}PU3AS1viiiDv2_i{2}{3}", funcName.size(),
                             funcName, prefetchCode, bitWidthId)
                   .str();
    SmallVector<Type> argTypes;
    for (auto arg : args) {
      argTypes.push_back(arg.getType());
    }
    LLVM::CallOp call = createDeviceFunctionCall(
        rewriter, funcName, LLVM::LLVMVoidType::get(rewriter.getContext()),
        argTypes, args, paramAttrs, funcAttr, op.getOperation());
    if (std::optional<ArrayAttr> optCacheControls =
            getCacheControlMetadata < isLoad || isPrefetch > (rewriter, op)) {
      call->setAttr(XeVMDialect::getCacheControlsAttrName(), *optCacheControls);
    }
    if constexpr (isLoad)
      rewriter.replaceOp(
          op, LLVM::LoadOp::create(rewriter, loc, vecType, spvLoadDstPtr));
    else
      rewriter.eraseOp(op);
    return success();
  }
};
 
//===----------------------------------------------------------------------===//
// Pass Definition
//===----------------------------------------------------------------------===//
 
struct ConvertXeVMToLLVMPass
    : public impl::ConvertXeVMToLLVMPassBase<ConvertXeVMToLLVMPass> {
  using Base::Base;
 
  void getDependentDialects(DialectRegistry &registry) const override {
    registry.insert<LLVM::LLVMDialect, XeVMDialect>();
  }
 
  void runOnOperation() override {
    ConversionTarget target(getContext());
    target.addLegalDialect<LLVM::LLVMDialect>();
    target.addIllegalDialect<XeVMDialect>();
    RewritePatternSet patterns(&getContext());
    populateXeVMToLLVMConversionPatterns(patterns);
    if (failed(applyPartialConversion(getOperation(), target,
                                      std::move(patterns))))
      signalPassFailure();
  }
};
} // namespace
 
//===----------------------------------------------------------------------===//
// ConvertToLLVMPatternInterface implementation
//===----------------------------------------------------------------------===//
 
namespace {
/// Implement the interface to convert XeVM to LLVM.
struct XeVMToLLVMDialectInterface : public ConvertToLLVMPatternInterface {
  using ConvertToLLVMPatternInterface::ConvertToLLVMPatternInterface;
  void loadDependentDialects(MLIRContext *context) const final {
    context->loadDialect<LLVM::LLVMDialect>();
  }
 
  /// Hook for derived dialect interface to provide conversion patterns
  /// and mark dialect legal for the conversion target.
  void populateConvertToLLVMConversionPatterns(
      ConversionTarget &target, LLVMTypeConverter &typeConverter,
      RewritePatternSet &patterns) const final {
    populateXeVMToLLVMConversionPatterns(patterns);
  }
};
} // namespace
 
//===----------------------------------------------------------------------===//
// Pattern Population
//===----------------------------------------------------------------------===//
 
void ::mlir::populateXeVMToLLVMConversionPatterns(RewritePatternSet &patterns) {
  patterns.add<LoadStorePrefetchToOCLPattern<BlockLoad2dOp>,
               LoadStorePrefetchToOCLPattern<BlockStore2dOp>,
               LoadStorePrefetchToOCLPattern<BlockPrefetch2dOp>,
               MMAToOCLPattern, MemfenceToOCLPattern, PrefetchToOCLPattern>(
      patterns.getContext());
}
 
void ::mlir::registerConvertXeVMToLLVMInterface(DialectRegistry &registry) {
  registry.addExtension(+[](MLIRContext *ctx, XeVMDialect *dialect) {
    dialect->addInterfaces<XeVMToLLVMDialectInterface>();
  });
}