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LowerToLLVM.cpp
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//====- LowerToLLVM.cpp - Lowering from CIR to LLVMIR ---------------------===//
//
// Part of the LLVM Project, 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
//
//===----------------------------------------------------------------------===//
//
// This file implements lowering of CIR operations to LLVMIR.
//
//===----------------------------------------------------------------------===//
#include "LoweringHelpers.h"
#include "mlir/Conversion/AffineToStandard/AffineToStandard.h"
#include "mlir/Conversion/ControlFlowToLLVM/ControlFlowToLLVM.h"
#include "mlir/Conversion/FuncToLLVM/ConvertFuncToLLVM.h"
#include "mlir/Conversion/FuncToLLVM/ConvertFuncToLLVMPass.h"
#include "mlir/Conversion/LLVMCommon/TypeConverter.h"
#include "mlir/Conversion/ReconcileUnrealizedCasts/ReconcileUnrealizedCasts.h"
#include "mlir/Conversion/SCFToControlFlow/SCFToControlFlow.h"
#include "mlir/Dialect/DLTI/DLTI.h"
#include "mlir/Dialect/Func/IR/FuncOps.h"
#include "mlir/Dialect/LLVMIR/LLVMAttrs.h"
#include "mlir/Dialect/LLVMIR/LLVMDialect.h"
#include "mlir/Dialect/LLVMIR/LLVMTypes.h"
#include "mlir/Dialect/LLVMIR/Transforms/Passes.h"
#include "mlir/IR/Attributes.h"
#include "mlir/IR/Builders.h"
#include "mlir/IR/BuiltinAttributeInterfaces.h"
#include "mlir/IR/BuiltinAttributes.h"
#include "mlir/IR/BuiltinDialect.h"
#include "mlir/IR/BuiltinOps.h"
#include "mlir/IR/BuiltinTypes.h"
#include "mlir/IR/OpDefinition.h"
#include "mlir/IR/Operation.h"
#include "mlir/IR/Types.h"
#include "mlir/IR/Value.h"
#include "mlir/IR/ValueRange.h"
#include "mlir/IR/Visitors.h"
#include "mlir/Interfaces/DataLayoutInterfaces.h"
#include "mlir/Pass/Pass.h"
#include "mlir/Pass/PassManager.h"
#include "mlir/Support/LLVM.h"
#include "mlir/Support/LogicalResult.h"
#include "mlir/Target/LLVMIR/Dialect/Builtin/BuiltinToLLVMIRTranslation.h"
#include "mlir/Target/LLVMIR/Dialect/LLVMIR/LLVMToLLVMIRTranslation.h"
#include "mlir/Target/LLVMIR/Dialect/OpenMP/OpenMPToLLVMIRTranslation.h"
#include "mlir/Target/LLVMIR/Export.h"
#include "mlir/Transforms/DialectConversion.h"
#include "clang/CIR/Dialect/IR/CIRAttrs.h"
#include "clang/CIR/Dialect/IR/CIRDialect.h"
#include "clang/CIR/Dialect/IR/CIROpsEnums.h"
#include "clang/CIR/Dialect/IR/CIRTypes.h"
#include "clang/CIR/Dialect/Passes.h"
#include "clang/CIR/Passes.h"
#include "llvm/ADT/APInt.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/Twine.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/ErrorHandling.h"
#include <cstdint>
#include <deque>
#include <optional>
#include <set>
using namespace cir;
using namespace llvm;
namespace cir {
namespace direct {
//===----------------------------------------------------------------------===//
// Helper Methods
//===----------------------------------------------------------------------===//
namespace {
/// Walks a region while skipping operations of type `Ops`. This ensures the
/// callback is not applied to said operations and its children.
template <typename... Ops>
void walkRegionSkipping(mlir::Region ®ion,
mlir::function_ref<void(mlir::Operation *)> callback) {
region.walk<mlir::WalkOrder::PreOrder>([&](mlir::Operation *op) {
if (isa<Ops...>(op))
return mlir::WalkResult::skip();
callback(op);
return mlir::WalkResult::advance();
});
}
/// Convert from a CIR comparison kind to an LLVM IR integral comparison kind.
mlir::LLVM::ICmpPredicate
convertCmpKindToICmpPredicate(mlir::cir::CmpOpKind kind, bool isSigned) {
using CIR = mlir::cir::CmpOpKind;
using LLVMICmp = mlir::LLVM::ICmpPredicate;
switch (kind) {
case CIR::eq:
return LLVMICmp::eq;
case CIR::ne:
return LLVMICmp::ne;
case CIR::lt:
return (isSigned ? LLVMICmp::slt : LLVMICmp::ult);
case CIR::le:
return (isSigned ? LLVMICmp::sle : LLVMICmp::ule);
case CIR::gt:
return (isSigned ? LLVMICmp::sgt : LLVMICmp::ugt);
case CIR::ge:
return (isSigned ? LLVMICmp::sge : LLVMICmp::uge);
}
llvm_unreachable("Unknown CmpOpKind");
}
/// Convert from a CIR comparison kind to an LLVM IR floating-point comparison
/// kind.
mlir::LLVM::FCmpPredicate
convertCmpKindToFCmpPredicate(mlir::cir::CmpOpKind kind) {
using CIR = mlir::cir::CmpOpKind;
using LLVMFCmp = mlir::LLVM::FCmpPredicate;
switch (kind) {
case CIR::eq:
return LLVMFCmp::oeq;
case CIR::ne:
return LLVMFCmp::une;
case CIR::lt:
return LLVMFCmp::olt;
case CIR::le:
return LLVMFCmp::ole;
case CIR::gt:
return LLVMFCmp::ogt;
case CIR::ge:
return LLVMFCmp::oge;
}
llvm_unreachable("Unknown CmpOpKind");
}
/// If the given type is a vector type, return the vector's element type.
/// Otherwise return the given type unchanged.
mlir::Type elementTypeIfVector(mlir::Type type) {
if (auto VecType = type.dyn_cast<mlir::cir::VectorType>()) {
return VecType.getEltType();
}
return type;
}
} // namespace
//===----------------------------------------------------------------------===//
// Visitors for Lowering CIR Const Attributes
//===----------------------------------------------------------------------===//
/// Switches on the type of attribute and calls the appropriate conversion.
inline mlir::Value
lowerCirAttrAsValue(mlir::Operation *parentOp, mlir::Attribute attr,
mlir::ConversionPatternRewriter &rewriter,
const mlir::TypeConverter *converter);
/// IntAttr visitor.
inline mlir::Value
lowerCirAttrAsValue(mlir::Operation *parentOp, mlir::cir::IntAttr intAttr,
mlir::ConversionPatternRewriter &rewriter,
const mlir::TypeConverter *converter) {
auto loc = parentOp->getLoc();
return rewriter.create<mlir::LLVM::ConstantOp>(
loc, converter->convertType(intAttr.getType()), intAttr.getValue());
}
/// BoolAttr visitor.
inline mlir::Value
lowerCirAttrAsValue(mlir::Operation *parentOp, mlir::cir::BoolAttr boolAttr,
mlir::ConversionPatternRewriter &rewriter,
const mlir::TypeConverter *converter) {
auto loc = parentOp->getLoc();
return rewriter.create<mlir::LLVM::ConstantOp>(
loc, converter->convertType(boolAttr.getType()), boolAttr.getValue());
}
/// ConstPtrAttr visitor.
inline mlir::Value
lowerCirAttrAsValue(mlir::Operation *parentOp, mlir::cir::ConstPtrAttr ptrAttr,
mlir::ConversionPatternRewriter &rewriter,
const mlir::TypeConverter *converter) {
auto loc = parentOp->getLoc();
if (ptrAttr.isNullValue()) {
return rewriter.create<mlir::LLVM::ZeroOp>(
loc, converter->convertType(ptrAttr.getType()));
}
mlir::Value ptrVal = rewriter.create<mlir::LLVM::ConstantOp>(
loc, rewriter.getI64Type(), ptrAttr.getValue());
return rewriter.create<mlir::LLVM::IntToPtrOp>(
loc, converter->convertType(ptrAttr.getType()), ptrVal);
}
/// FPAttr visitor.
inline mlir::Value
lowerCirAttrAsValue(mlir::Operation *parentOp, mlir::cir::FPAttr fltAttr,
mlir::ConversionPatternRewriter &rewriter,
const mlir::TypeConverter *converter) {
auto loc = parentOp->getLoc();
return rewriter.create<mlir::LLVM::ConstantOp>(
loc, converter->convertType(fltAttr.getType()), fltAttr.getValue());
}
/// ZeroAttr visitor.
inline mlir::Value
lowerCirAttrAsValue(mlir::Operation *parentOp, mlir::cir::ZeroAttr zeroAttr,
mlir::ConversionPatternRewriter &rewriter,
const mlir::TypeConverter *converter) {
auto loc = parentOp->getLoc();
return rewriter.create<mlir::cir::ZeroInitConstOp>(
loc, converter->convertType(zeroAttr.getType()));
}
/// ConstStruct visitor.
mlir::Value lowerCirAttrAsValue(mlir::Operation *parentOp,
mlir::cir::ConstStructAttr constStruct,
mlir::ConversionPatternRewriter &rewriter,
const mlir::TypeConverter *converter) {
auto llvmTy = converter->convertType(constStruct.getType());
auto loc = parentOp->getLoc();
mlir::Value result = rewriter.create<mlir::LLVM::UndefOp>(loc, llvmTy);
// Iteratively lower each constant element of the struct.
for (auto [idx, elt] : llvm::enumerate(constStruct.getMembers())) {
mlir::Value init = lowerCirAttrAsValue(parentOp, elt, rewriter, converter);
result = rewriter.create<mlir::LLVM::InsertValueOp>(loc, result, init, idx);
}
return result;
}
// VTableAttr visitor.
mlir::Value lowerCirAttrAsValue(mlir::Operation *parentOp,
mlir::cir::VTableAttr vtableArr,
mlir::ConversionPatternRewriter &rewriter,
const mlir::TypeConverter *converter) {
auto llvmTy = converter->convertType(vtableArr.getType());
auto loc = parentOp->getLoc();
mlir::Value result = rewriter.create<mlir::LLVM::UndefOp>(loc, llvmTy);
for (auto [idx, elt] : llvm::enumerate(vtableArr.getVtableData())) {
mlir::Value init = lowerCirAttrAsValue(parentOp, elt, rewriter, converter);
result = rewriter.create<mlir::LLVM::InsertValueOp>(loc, result, init, idx);
}
return result;
}
// TypeInfoAttr visitor.
mlir::Value lowerCirAttrAsValue(mlir::Operation *parentOp,
mlir::cir::TypeInfoAttr typeinfoArr,
mlir::ConversionPatternRewriter &rewriter,
const mlir::TypeConverter *converter) {
auto llvmTy = converter->convertType(typeinfoArr.getType());
auto loc = parentOp->getLoc();
mlir::Value result = rewriter.create<mlir::LLVM::UndefOp>(loc, llvmTy);
for (auto [idx, elt] : llvm::enumerate(typeinfoArr.getData())) {
mlir::Value init = lowerCirAttrAsValue(parentOp, elt, rewriter, converter);
result = rewriter.create<mlir::LLVM::InsertValueOp>(loc, result, init, idx);
}
return result;
}
// ConstArrayAttr visitor
mlir::Value lowerCirAttrAsValue(mlir::Operation *parentOp,
mlir::cir::ConstArrayAttr constArr,
mlir::ConversionPatternRewriter &rewriter,
const mlir::TypeConverter *converter) {
auto llvmTy = converter->convertType(constArr.getType());
auto loc = parentOp->getLoc();
mlir::Value result;
if (auto zeros = constArr.getTrailingZerosNum()) {
auto arrayTy = constArr.getType();
result = rewriter.create<mlir::cir::ZeroInitConstOp>(
loc, converter->convertType(arrayTy));
} else {
result = rewriter.create<mlir::LLVM::UndefOp>(loc, llvmTy);
}
// Iteratively lower each constant element of the array.
if (auto arrayAttr = constArr.getElts().dyn_cast<mlir::ArrayAttr>()) {
for (auto [idx, elt] : llvm::enumerate(arrayAttr)) {
mlir::Value init =
lowerCirAttrAsValue(parentOp, elt, rewriter, converter);
result =
rewriter.create<mlir::LLVM::InsertValueOp>(loc, result, init, idx);
}
}
// TODO(cir): this diverges from traditional lowering. Normally the string
// would be a global constant that is memcopied.
else if (auto strAttr = constArr.getElts().dyn_cast<mlir::StringAttr>()) {
auto arrayTy = strAttr.getType().dyn_cast<mlir::cir::ArrayType>();
assert(arrayTy && "String attribute must have an array type");
auto eltTy = arrayTy.getEltType();
for (auto [idx, elt] : llvm::enumerate(strAttr)) {
auto init = rewriter.create<mlir::LLVM::ConstantOp>(
loc, converter->convertType(eltTy), elt);
result =
rewriter.create<mlir::LLVM::InsertValueOp>(loc, result, init, idx);
}
} else {
llvm_unreachable("unexpected ConstArrayAttr elements");
}
return result;
}
// GlobalViewAttr visitor.
mlir::Value lowerCirAttrAsValue(mlir::Operation *parentOp,
mlir::cir::GlobalViewAttr globalAttr,
mlir::ConversionPatternRewriter &rewriter,
const mlir::TypeConverter *converter) {
auto module = parentOp->getParentOfType<mlir::ModuleOp>();
mlir::Type sourceType;
llvm::StringRef symName;
auto *sourceSymbol =
mlir::SymbolTable::lookupSymbolIn(module, globalAttr.getSymbol());
if (auto llvmSymbol = dyn_cast<mlir::LLVM::GlobalOp>(sourceSymbol)) {
sourceType = llvmSymbol.getType();
symName = llvmSymbol.getSymName();
} else if (auto cirSymbol = dyn_cast<mlir::cir::GlobalOp>(sourceSymbol)) {
sourceType = converter->convertType(cirSymbol.getSymType());
symName = cirSymbol.getSymName();
} else if (auto llvmFun = dyn_cast<mlir::LLVM::LLVMFuncOp>(sourceSymbol)) {
sourceType = llvmFun.getFunctionType();
symName = llvmFun.getSymName();
} else if (auto fun = dyn_cast<mlir::cir::FuncOp>(sourceSymbol)) {
sourceType = converter->convertType(fun.getFunctionType());
symName = fun.getSymName();
} else {
llvm_unreachable("Unexpected GlobalOp type");
}
auto loc = parentOp->getLoc();
mlir::Value addrOp = rewriter.create<mlir::LLVM::AddressOfOp>(
loc, mlir::LLVM::LLVMPointerType::get(rewriter.getContext()), symName);
if (globalAttr.getIndices()) {
llvm::SmallVector<mlir::LLVM::GEPArg> indices;
for (auto idx : globalAttr.getIndices()) {
auto intAttr = dyn_cast<mlir::IntegerAttr>(idx);
assert(intAttr && "index must be integers");
indices.push_back(intAttr.getValue().getSExtValue());
}
auto resTy = addrOp.getType();
auto eltTy = converter->convertType(sourceType);
addrOp = rewriter.create<mlir::LLVM::GEPOp>(loc, resTy, eltTy, addrOp,
indices, true);
}
auto ptrTy = globalAttr.getType().dyn_cast<mlir::cir::PointerType>();
assert(ptrTy && "Expecting pointer type in GlobalViewAttr");
auto llvmEltTy = converter->convertType(ptrTy.getPointee());
if (llvmEltTy == sourceType)
return addrOp;
auto llvmDstTy = converter->convertType(globalAttr.getType());
return rewriter.create<mlir::LLVM::BitcastOp>(parentOp->getLoc(), llvmDstTy,
addrOp);
}
/// Switches on the type of attribute and calls the appropriate conversion.
inline mlir::Value
lowerCirAttrAsValue(mlir::Operation *parentOp, mlir::Attribute attr,
mlir::ConversionPatternRewriter &rewriter,
const mlir::TypeConverter *converter) {
if (const auto intAttr = attr.dyn_cast<mlir::cir::IntAttr>())
return lowerCirAttrAsValue(parentOp, intAttr, rewriter, converter);
if (const auto fltAttr = attr.dyn_cast<mlir::cir::FPAttr>())
return lowerCirAttrAsValue(parentOp, fltAttr, rewriter, converter);
if (const auto ptrAttr = attr.dyn_cast<mlir::cir::ConstPtrAttr>())
return lowerCirAttrAsValue(parentOp, ptrAttr, rewriter, converter);
if (const auto constStruct = attr.dyn_cast<mlir::cir::ConstStructAttr>())
return lowerCirAttrAsValue(parentOp, constStruct, rewriter, converter);
if (const auto constArr = attr.dyn_cast<mlir::cir::ConstArrayAttr>())
return lowerCirAttrAsValue(parentOp, constArr, rewriter, converter);
if (const auto boolAttr = attr.dyn_cast<mlir::cir::BoolAttr>())
return lowerCirAttrAsValue(parentOp, boolAttr, rewriter, converter);
if (const auto zeroAttr = attr.dyn_cast<mlir::cir::ZeroAttr>())
return lowerCirAttrAsValue(parentOp, zeroAttr, rewriter, converter);
if (const auto globalAttr = attr.dyn_cast<mlir::cir::GlobalViewAttr>())
return lowerCirAttrAsValue(parentOp, globalAttr, rewriter, converter);
if (const auto vtableAttr = attr.dyn_cast<mlir::cir::VTableAttr>())
return lowerCirAttrAsValue(parentOp, vtableAttr, rewriter, converter);
if (const auto typeinfoAttr = attr.dyn_cast<mlir::cir::TypeInfoAttr>())
return lowerCirAttrAsValue(parentOp, typeinfoAttr, rewriter, converter);
llvm_unreachable("unhandled attribute type");
}
//===----------------------------------------------------------------------===//
mlir::LLVM::Linkage convertLinkage(mlir::cir::GlobalLinkageKind linkage) {
using CIR = mlir::cir::GlobalLinkageKind;
using LLVM = mlir::LLVM::Linkage;
switch (linkage) {
case CIR::AvailableExternallyLinkage:
return LLVM::AvailableExternally;
case CIR::CommonLinkage:
return LLVM::Common;
case CIR::ExternalLinkage:
return LLVM::External;
case CIR::ExternalWeakLinkage:
return LLVM::ExternWeak;
case CIR::InternalLinkage:
return LLVM::Internal;
case CIR::LinkOnceAnyLinkage:
return LLVM::Linkonce;
case CIR::LinkOnceODRLinkage:
return LLVM::LinkonceODR;
case CIR::PrivateLinkage:
return LLVM::Private;
case CIR::WeakAnyLinkage:
return LLVM::Weak;
case CIR::WeakODRLinkage:
return LLVM::WeakODR;
};
}
class CIRCopyOpLowering : public mlir::OpConversionPattern<mlir::cir::CopyOp> {
public:
using mlir::OpConversionPattern<mlir::cir::CopyOp>::OpConversionPattern;
mlir::LogicalResult
matchAndRewrite(mlir::cir::CopyOp op, OpAdaptor adaptor,
mlir::ConversionPatternRewriter &rewriter) const override {
const mlir::Value length = rewriter.create<mlir::LLVM::ConstantOp>(
op.getLoc(), rewriter.getI32Type(), op.getLength());
rewriter.replaceOpWithNewOp<mlir::LLVM::MemcpyOp>(
op, adaptor.getDst(), adaptor.getSrc(), length, /*isVolatile=*/false);
return mlir::success();
}
};
class CIRMemCpyOpLowering
: public mlir::OpConversionPattern<mlir::cir::MemCpyOp> {
public:
using mlir::OpConversionPattern<mlir::cir::MemCpyOp>::OpConversionPattern;
mlir::LogicalResult
matchAndRewrite(mlir::cir::MemCpyOp op, OpAdaptor adaptor,
mlir::ConversionPatternRewriter &rewriter) const override {
rewriter.replaceOpWithNewOp<mlir::LLVM::MemcpyOp>(
op, adaptor.getDst(), adaptor.getSrc(), adaptor.getLen(),
/*isVolatile=*/false);
return mlir::success();
}
};
static mlir::Value getLLVMIntCast(mlir::ConversionPatternRewriter &rewriter,
mlir::Value llvmSrc,
mlir::IntegerType llvmDstIntTy,
bool isUnsigned, uint64_t cirDstIntWidth) {
auto cirSrcWidth = llvmSrc.getType().cast<mlir::IntegerType>().getWidth();
if (cirSrcWidth == cirDstIntWidth)
return llvmSrc;
auto loc = llvmSrc.getLoc();
if (cirSrcWidth < cirDstIntWidth) {
if (isUnsigned)
return rewriter.create<mlir::LLVM::ZExtOp>(loc, llvmDstIntTy, llvmSrc);
return rewriter.create<mlir::LLVM::SExtOp>(loc, llvmDstIntTy, llvmSrc);
}
// Otherwise truncate
return rewriter.create<mlir::LLVM::TruncOp>(loc, llvmDstIntTy, llvmSrc);
}
class CIRPtrStrideOpLowering
: public mlir::OpConversionPattern<mlir::cir::PtrStrideOp> {
public:
using mlir::OpConversionPattern<mlir::cir::PtrStrideOp>::OpConversionPattern;
mlir::LogicalResult
matchAndRewrite(mlir::cir::PtrStrideOp ptrStrideOp, OpAdaptor adaptor,
mlir::ConversionPatternRewriter &rewriter) const override {
auto *tc = getTypeConverter();
const auto resultTy = tc->convertType(ptrStrideOp.getType());
auto elementTy = tc->convertType(ptrStrideOp.getElementTy());
auto *ctx = elementTy.getContext();
// void and function types doesn't really have a layout to use in GEPs,
// make it i8 instead.
if (elementTy.isa<mlir::LLVM::LLVMVoidType>() ||
elementTy.isa<mlir::LLVM::LLVMFunctionType>())
elementTy = mlir::IntegerType::get(elementTy.getContext(), 8,
mlir::IntegerType::Signless);
// Zero-extend, sign-extend or trunc the pointer value.
auto index = adaptor.getStride();
auto width = index.getType().cast<mlir::IntegerType>().getWidth();
mlir::DataLayout LLVMLayout(
index.getDefiningOp()->getParentOfType<mlir::ModuleOp>());
auto layoutWidth =
LLVMLayout.getTypeIndexBitwidth(adaptor.getBase().getType());
if (layoutWidth && width != *layoutWidth) {
// If the index comes from a subtraction, make sure the extension happens
// before it. To achieve that, look at unary minus, which already got
// lowered to "sub 0, x".
auto sub = dyn_cast<mlir::LLVM::SubOp>(index.getDefiningOp());
auto unary =
dyn_cast<mlir::cir::UnaryOp>(ptrStrideOp.getStride().getDefiningOp());
bool rewriteSub =
unary && unary.getKind() == mlir::cir::UnaryOpKind::Minus && sub;
if (rewriteSub)
index = index.getDefiningOp()->getOperand(1);
// Handle the cast
auto llvmDstType = mlir::IntegerType::get(ctx, *layoutWidth);
index = getLLVMIntCast(rewriter, index, llvmDstType,
ptrStrideOp.getStride().getType().isUnsigned(),
*layoutWidth);
// Rewrite the sub in front of extensions/trunc
if (rewriteSub) {
index = rewriter.create<mlir::LLVM::SubOp>(
index.getLoc(), index.getType(),
rewriter.create<mlir::LLVM::ConstantOp>(
index.getLoc(), index.getType(),
mlir::IntegerAttr::get(index.getType(), 0)),
index);
sub->erase();
}
}
rewriter.replaceOpWithNewOp<mlir::LLVM::GEPOp>(
ptrStrideOp, resultTy, elementTy, adaptor.getBase(), index);
return mlir::success();
}
};
class CIRBrCondOpLowering
: public mlir::OpConversionPattern<mlir::cir::BrCondOp> {
public:
using mlir::OpConversionPattern<mlir::cir::BrCondOp>::OpConversionPattern;
mlir::LogicalResult
matchAndRewrite(mlir::cir::BrCondOp brOp, OpAdaptor adaptor,
mlir::ConversionPatternRewriter &rewriter) const override {
mlir::Value i1Condition;
if (auto defOp = adaptor.getCond().getDefiningOp()) {
if (auto zext = dyn_cast<mlir::LLVM::ZExtOp>(defOp)) {
if (zext->use_empty() &&
zext->getOperand(0).getType() == rewriter.getI1Type()) {
i1Condition = zext->getOperand(0);
rewriter.eraseOp(zext);
}
}
}
if (!i1Condition)
i1Condition = rewriter.create<mlir::LLVM::TruncOp>(
brOp.getLoc(), rewriter.getI1Type(), adaptor.getCond());
rewriter.replaceOpWithNewOp<mlir::LLVM::CondBrOp>(
brOp, i1Condition, brOp.getDestTrue(), adaptor.getDestOperandsTrue(),
brOp.getDestFalse(), adaptor.getDestOperandsFalse());
return mlir::success();
}
};
class CIRCastOpLowering : public mlir::OpConversionPattern<mlir::cir::CastOp> {
public:
using mlir::OpConversionPattern<mlir::cir::CastOp>::OpConversionPattern;
inline mlir::Type convertTy(mlir::Type ty) const {
return getTypeConverter()->convertType(ty);
}
mlir::LogicalResult
matchAndRewrite(mlir::cir::CastOp castOp, OpAdaptor adaptor,
mlir::ConversionPatternRewriter &rewriter) const override {
// For arithmetic conversions, LLVM IR uses the same instruction to convert
// both individual scalars and entire vectors. This lowering pass handles
// both situations.
auto src = adaptor.getSrc();
switch (castOp.getKind()) {
case mlir::cir::CastKind::array_to_ptrdecay: {
const auto ptrTy = castOp.getType().cast<mlir::cir::PointerType>();
auto sourceValue = adaptor.getOperands().front();
auto targetType = convertTy(ptrTy);
auto elementTy = convertTy(ptrTy.getPointee());
auto offset = llvm::SmallVector<mlir::LLVM::GEPArg>{0};
rewriter.replaceOpWithNewOp<mlir::LLVM::GEPOp>(
castOp, targetType, elementTy, sourceValue, offset);
break;
}
case mlir::cir::CastKind::int_to_bool: {
auto zero = rewriter.create<mlir::cir::ConstantOp>(
src.getLoc(), castOp.getSrc().getType(),
mlir::cir::IntAttr::get(castOp.getSrc().getType(), 0));
rewriter.replaceOpWithNewOp<mlir::cir::CmpOp>(
castOp, mlir::cir::BoolType::get(getContext()),
mlir::cir::CmpOpKind::ne, castOp.getSrc(), zero);
break;
}
case mlir::cir::CastKind::integral: {
auto srcType = castOp.getSrc().getType();
auto dstType = castOp.getResult().getType();
auto llvmSrcVal = adaptor.getOperands().front();
auto llvmDstType = getTypeConverter()->convertType(dstType);
mlir::cir::IntType srcIntType =
elementTypeIfVector(srcType).cast<mlir::cir::IntType>();
mlir::cir::IntType dstIntType =
elementTypeIfVector(dstType).cast<mlir::cir::IntType>();
rewriter.replaceOp(castOp,
getLLVMIntCast(rewriter, llvmSrcVal,
llvmDstType.cast<mlir::IntegerType>(),
srcIntType.isUnsigned(),
dstIntType.getWidth()));
break;
}
case mlir::cir::CastKind::floating: {
auto llvmSrcVal = adaptor.getOperands().front();
auto llvmDstTy =
getTypeConverter()->convertType(castOp.getResult().getType());
auto srcTy = elementTypeIfVector(castOp.getSrc().getType());
auto dstTy = elementTypeIfVector(castOp.getResult().getType());
if (!dstTy.isa<mlir::cir::CIRFPTypeInterface>() ||
!srcTy.isa<mlir::cir::CIRFPTypeInterface>())
return castOp.emitError()
<< "NYI cast from " << srcTy << " to " << dstTy;
auto getFloatWidth = [](mlir::Type ty) -> unsigned {
return ty.cast<mlir::cir::CIRFPTypeInterface>().getWidth();
};
if (getFloatWidth(srcTy) > getFloatWidth(dstTy))
rewriter.replaceOpWithNewOp<mlir::LLVM::FPTruncOp>(castOp, llvmDstTy,
llvmSrcVal);
else
rewriter.replaceOpWithNewOp<mlir::LLVM::FPExtOp>(castOp, llvmDstTy,
llvmSrcVal);
return mlir::success();
}
case mlir::cir::CastKind::int_to_ptr: {
auto dstTy = castOp.getType().cast<mlir::cir::PointerType>();
auto llvmSrcVal = adaptor.getOperands().front();
auto llvmDstTy = getTypeConverter()->convertType(dstTy);
rewriter.replaceOpWithNewOp<mlir::LLVM::IntToPtrOp>(castOp, llvmDstTy,
llvmSrcVal);
return mlir::success();
}
case mlir::cir::CastKind::ptr_to_int: {
auto dstTy = castOp.getType().cast<mlir::cir::IntType>();
auto llvmSrcVal = adaptor.getOperands().front();
auto llvmDstTy = getTypeConverter()->convertType(dstTy);
rewriter.replaceOpWithNewOp<mlir::LLVM::PtrToIntOp>(castOp, llvmDstTy,
llvmSrcVal);
return mlir::success();
}
case mlir::cir::CastKind::float_to_bool: {
auto dstTy = castOp.getType().cast<mlir::cir::BoolType>();
auto llvmSrcVal = adaptor.getOperands().front();
auto llvmDstTy = getTypeConverter()->convertType(dstTy);
auto kind = mlir::LLVM::FCmpPredicate::une;
// Check if float is not equal to zero.
auto zeroFloat = rewriter.create<mlir::LLVM::ConstantOp>(
castOp.getLoc(), llvmSrcVal.getType(),
mlir::FloatAttr::get(llvmSrcVal.getType(), 0.0));
// Extend comparison result to either bool (C++) or int (C).
mlir::Value cmpResult = rewriter.create<mlir::LLVM::FCmpOp>(
castOp.getLoc(), kind, llvmSrcVal, zeroFloat);
rewriter.replaceOpWithNewOp<mlir::LLVM::ZExtOp>(castOp, llvmDstTy,
cmpResult);
return mlir::success();
}
case mlir::cir::CastKind::bool_to_int: {
auto dstTy = castOp.getType().cast<mlir::cir::IntType>();
auto llvmSrcVal = adaptor.getOperands().front();
auto llvmSrcTy = llvmSrcVal.getType().cast<mlir::IntegerType>();
auto llvmDstTy =
getTypeConverter()->convertType(dstTy).cast<mlir::IntegerType>();
if (llvmSrcTy.getWidth() == llvmDstTy.getWidth())
rewriter.replaceOpWithNewOp<mlir::LLVM::BitcastOp>(castOp, llvmDstTy,
llvmSrcVal);
else
rewriter.replaceOpWithNewOp<mlir::LLVM::ZExtOp>(castOp, llvmDstTy,
llvmSrcVal);
return mlir::success();
}
case mlir::cir::CastKind::bool_to_float: {
auto dstTy = castOp.getType();
auto llvmSrcVal = adaptor.getOperands().front();
auto llvmDstTy = getTypeConverter()->convertType(dstTy);
rewriter.replaceOpWithNewOp<mlir::LLVM::UIToFPOp>(castOp, llvmDstTy,
llvmSrcVal);
return mlir::success();
}
case mlir::cir::CastKind::int_to_float: {
auto dstTy = castOp.getType();
auto llvmSrcVal = adaptor.getOperands().front();
auto llvmDstTy = getTypeConverter()->convertType(dstTy);
if (elementTypeIfVector(castOp.getSrc().getType())
.cast<mlir::cir::IntType>()
.isSigned())
rewriter.replaceOpWithNewOp<mlir::LLVM::SIToFPOp>(castOp, llvmDstTy,
llvmSrcVal);
else
rewriter.replaceOpWithNewOp<mlir::LLVM::UIToFPOp>(castOp, llvmDstTy,
llvmSrcVal);
return mlir::success();
}
case mlir::cir::CastKind::float_to_int: {
auto dstTy = castOp.getType();
auto llvmSrcVal = adaptor.getOperands().front();
auto llvmDstTy = getTypeConverter()->convertType(dstTy);
if (elementTypeIfVector(castOp.getResult().getType())
.cast<mlir::cir::IntType>()
.isSigned())
rewriter.replaceOpWithNewOp<mlir::LLVM::FPToSIOp>(castOp, llvmDstTy,
llvmSrcVal);
else
rewriter.replaceOpWithNewOp<mlir::LLVM::FPToUIOp>(castOp, llvmDstTy,
llvmSrcVal);
return mlir::success();
}
case mlir::cir::CastKind::bitcast: {
auto dstTy = castOp.getType();
auto llvmSrcVal = adaptor.getOperands().front();
auto llvmDstTy = getTypeConverter()->convertType(dstTy);
rewriter.replaceOpWithNewOp<mlir::LLVM::BitcastOp>(castOp, llvmDstTy,
llvmSrcVal);
return mlir::success();
}
case mlir::cir::CastKind::ptr_to_bool: {
auto null = rewriter.create<mlir::cir::ConstantOp>(
src.getLoc(), castOp.getSrc().getType(),
mlir::cir::ConstPtrAttr::get(getContext(), castOp.getSrc().getType(),
0));
rewriter.replaceOpWithNewOp<mlir::cir::CmpOp>(
castOp, mlir::cir::BoolType::get(getContext()),
mlir::cir::CmpOpKind::ne, castOp.getSrc(), null);
break;
}
}
return mlir::success();
}
};
class CIRReturnLowering
: public mlir::OpConversionPattern<mlir::cir::ReturnOp> {
public:
using OpConversionPattern<mlir::cir::ReturnOp>::OpConversionPattern;
mlir::LogicalResult
matchAndRewrite(mlir::cir::ReturnOp op, OpAdaptor adaptor,
mlir::ConversionPatternRewriter &rewriter) const override {
rewriter.replaceOpWithNewOp<mlir::func::ReturnOp>(op,
adaptor.getOperands());
return mlir::LogicalResult::success();
}
};
struct ConvertCIRToLLVMPass
: public mlir::PassWrapper<ConvertCIRToLLVMPass,
mlir::OperationPass<mlir::ModuleOp>> {
void getDependentDialects(mlir::DialectRegistry ®istry) const override {
registry.insert<mlir::BuiltinDialect, mlir::DLTIDialect,
mlir::LLVM::LLVMDialect, mlir::func::FuncDialect>();
}
void runOnOperation() final;
virtual StringRef getArgument() const override { return "cir-flat-to-llvm"; }
};
class CIRCallLowering : public mlir::OpConversionPattern<mlir::cir::CallOp> {
public:
using OpConversionPattern<mlir::cir::CallOp>::OpConversionPattern;
mlir::LogicalResult
matchAndRewrite(mlir::cir::CallOp op, OpAdaptor adaptor,
mlir::ConversionPatternRewriter &rewriter) const override {
llvm::SmallVector<mlir::Type, 8> llvmResults;
auto cirResults = op.getResultTypes();
auto *converter = getTypeConverter();
if (converter->convertTypes(cirResults, llvmResults).failed())
return mlir::failure();
if (auto callee = op.getCalleeAttr()) { // direct call
rewriter.replaceOpWithNewOp<mlir::LLVM::CallOp>(
op, llvmResults, op.getCalleeAttr(), adaptor.getOperands());
} else { // indirect call
assert(op.getOperands().size() &&
"operands list must no be empty for the indirect call");
auto typ = op.getOperands().front().getType();
assert(isa<mlir::cir::PointerType>(typ) && "expected pointer type");
auto ptyp = dyn_cast<mlir::cir::PointerType>(typ);
auto ftyp = dyn_cast<mlir::cir::FuncType>(ptyp.getPointee());
assert(ftyp && "expected a pointer to a function as the first operand");
rewriter.replaceOpWithNewOp<mlir::LLVM::CallOp>(
op,
dyn_cast<mlir::LLVM::LLVMFunctionType>(converter->convertType(ftyp)),
adaptor.getOperands());
}
return mlir::success();
}
};
class CIRAllocaLowering
: public mlir::OpConversionPattern<mlir::cir::AllocaOp> {
public:
using OpConversionPattern<mlir::cir::AllocaOp>::OpConversionPattern;
mlir::LogicalResult
matchAndRewrite(mlir::cir::AllocaOp op, OpAdaptor adaptor,
mlir::ConversionPatternRewriter &rewriter) const override {
mlir::Value size =
op.isDynamic()
? adaptor.getDynAllocSize()
: rewriter.create<mlir::LLVM::ConstantOp>(
op.getLoc(),
typeConverter->convertType(rewriter.getIndexType()),
rewriter.getIntegerAttr(rewriter.getIndexType(), 1));
auto elementTy = getTypeConverter()->convertType(op.getAllocaType());
auto resultTy = mlir::LLVM::LLVMPointerType::get(getContext());
rewriter.replaceOpWithNewOp<mlir::LLVM::AllocaOp>(
op, resultTy, elementTy, size, op.getAlignmentAttr().getInt());
return mlir::success();
}
};
static mlir::LLVM::AtomicOrdering
getLLVMMemOrder(std::optional<mlir::cir::MemOrder> &memorder) {
if (!memorder)
return mlir::LLVM::AtomicOrdering::not_atomic;
switch (*memorder) {
case mlir::cir::MemOrder::Relaxed:
return mlir::LLVM::AtomicOrdering::monotonic;
case mlir::cir::MemOrder::Consume:
case mlir::cir::MemOrder::Acquire:
return mlir::LLVM::AtomicOrdering::acquire;
case mlir::cir::MemOrder::Release:
return mlir::LLVM::AtomicOrdering::release;
case mlir::cir::MemOrder::AcquireRelease:
return mlir::LLVM::AtomicOrdering::acq_rel;
case mlir::cir::MemOrder::SequentiallyConsistent:
return mlir::LLVM::AtomicOrdering::seq_cst;
}
llvm_unreachable("unknown memory order");
}
class CIRLoadLowering : public mlir::OpConversionPattern<mlir::cir::LoadOp> {
public:
using OpConversionPattern<mlir::cir::LoadOp>::OpConversionPattern;
mlir::LogicalResult
matchAndRewrite(mlir::cir::LoadOp op, OpAdaptor adaptor,
mlir::ConversionPatternRewriter &rewriter) const override {
const auto llvmTy =
getTypeConverter()->convertType(op.getResult().getType());
unsigned alignment = 0;
auto memorder = op.getMemOrder();
auto ordering = getLLVMMemOrder(memorder);
// FIXME: right now we only pass in the alignment when the memory access
// is atomic, we should always pass it instead.
if (ordering != mlir::LLVM::AtomicOrdering::not_atomic) {
mlir::DataLayout layout(op->getParentOfType<mlir::ModuleOp>());
alignment = (unsigned)layout.getTypeABIAlignment(llvmTy);
}
// TODO: nontemporal, invariant, syncscope.
rewriter.replaceOpWithNewOp<mlir::LLVM::LoadOp>(
op, llvmTy, adaptor.getAddr(), /* alignment */ alignment,
op.getIsVolatile(), /* nontemporal */ false,
/* invariant */ false, ordering);
return mlir::LogicalResult::success();
}
};
class CIRStoreLowering : public mlir::OpConversionPattern<mlir::cir::StoreOp> {
public:
using OpConversionPattern<mlir::cir::StoreOp>::OpConversionPattern;
mlir::LogicalResult
matchAndRewrite(mlir::cir::StoreOp op, OpAdaptor adaptor,
mlir::ConversionPatternRewriter &rewriter) const override {
unsigned alignment = 0;
auto memorder = op.getMemOrder();
auto ordering = getLLVMMemOrder(memorder);
// FIXME: right now we only pass in the alignment when the memory access
// is atomic, we should always pass it instead.
if (ordering != mlir::LLVM::AtomicOrdering::not_atomic) {
const auto llvmTy =
getTypeConverter()->convertType(op.getValue().getType());
mlir::DataLayout layout(op->getParentOfType<mlir::ModuleOp>());
alignment = (unsigned)layout.getTypeABIAlignment(llvmTy);
}
// TODO: nontemporal, syncscope.
rewriter.replaceOpWithNewOp<mlir::LLVM::StoreOp>(
op, adaptor.getValue(), adaptor.getAddr(), alignment,
op.getIsVolatile(), /* nontemporal */ false, ordering);
return mlir::LogicalResult::success();
}
};
mlir::DenseElementsAttr
convertStringAttrToDenseElementsAttr(mlir::cir::ConstArrayAttr attr,
mlir::Type type) {
auto values = llvm::SmallVector<mlir::APInt, 8>{};
auto stringAttr = attr.getElts().dyn_cast<mlir::StringAttr>();
assert(stringAttr && "expected string attribute here");
for (auto element : stringAttr)
values.push_back({8, (uint64_t)element});
return mlir::DenseElementsAttr::get(
mlir::RankedTensorType::get({(int64_t)values.size()}, type),
llvm::ArrayRef(values));
}
template <typename StorageTy> StorageTy getZeroInitFromType(mlir::Type Ty);
template <> mlir::APInt getZeroInitFromType(mlir::Type Ty) {
assert(Ty.isa<mlir::cir::IntType>() && "expected int type");
auto IntTy = Ty.cast<mlir::cir::IntType>();
return mlir::APInt::getZero(IntTy.getWidth());
}
template <> mlir::APFloat getZeroInitFromType(mlir::Type Ty) {
assert((Ty.isa<mlir::cir::SingleType, mlir::cir::DoubleType>()) &&
"only float and double supported");
if (Ty.isF32() || Ty.isa<mlir::cir::SingleType>())
return mlir::APFloat(0.f);
if (Ty.isF64() || Ty.isa<mlir::cir::DoubleType>())
return mlir::APFloat(0.0);
llvm_unreachable("NYI");
}
// return the nested type and quantity of elements for cir.array type.
// e.g: for !cir.array<!cir.array<!s32i x 3> x 1>
// it returns !s32i as return value and stores 3 to elemQuantity.
mlir::Type getNestedTypeAndElemQuantity(mlir::Type Ty, unsigned &elemQuantity) {
assert(Ty.isa<mlir::cir::ArrayType>() && "expected ArrayType");
elemQuantity = 1;
mlir::Type nestTy = Ty;
while (auto ArrTy = nestTy.dyn_cast<mlir::cir::ArrayType>()) {
nestTy = ArrTy.getEltType();
elemQuantity *= ArrTy.getSize();
}
return nestTy;
}
template <typename AttrTy, typename StorageTy>
void convertToDenseElementsAttrImpl(mlir::cir::ConstArrayAttr attr,
llvm::SmallVectorImpl<StorageTy> &values) {
auto arrayAttr = attr.getElts().cast<mlir::ArrayAttr>();
for (auto eltAttr : arrayAttr) {
if (auto valueAttr = eltAttr.dyn_cast<AttrTy>()) {
values.push_back(valueAttr.getValue());
} else if (auto subArrayAttr =
eltAttr.dyn_cast<mlir::cir::ConstArrayAttr>()) {
convertToDenseElementsAttrImpl<AttrTy>(subArrayAttr, values);
} else if (auto zeroAttr = eltAttr.dyn_cast<mlir::cir::ZeroAttr>()) {
unsigned numStoredZeros = 0;
auto nestTy =
getNestedTypeAndElemQuantity(zeroAttr.getType(), numStoredZeros);
values.insert(values.end(), numStoredZeros,
getZeroInitFromType<StorageTy>(nestTy));
} else {
llvm_unreachable("unknown element in ConstArrayAttr");
}
}
// Only fill in trailing zeros at the local cir.array level where the element
// type isn't another array (for the mult-dim case).
auto numTrailingZeros = attr.getTrailingZerosNum();
if (numTrailingZeros) {
auto localArrayTy = attr.getType().dyn_cast<mlir::cir::ArrayType>();
assert(localArrayTy && "expected !cir.array");
auto nestTy = localArrayTy.getEltType();
if (!nestTy.isa<mlir::cir::ArrayType>())
values.insert(values.end(), localArrayTy.getSize() - numTrailingZeros,
getZeroInitFromType<StorageTy>(nestTy));
}
}