llvm-project/mlir/lib/Dialect/SparseTensor/Transforms/SparseTensorConversion.cpp

315 lines
11 KiB
C++

//===- SparseTensorLowering.cpp - Sparse tensor primitives conversion -----===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// Convert sparse tensor primitives to calls into a runtime support library.
// Note that this is a current implementation choice to keep the conversion
// simple. In principle, these primitives could also be converted to actual
// elaborate IR code that implements the primitives on the selected sparse
// tensor storage schemes.
//
//===----------------------------------------------------------------------===//
#include "mlir/Dialect/LLVMIR/LLVMTypes.h"
#include "mlir/Dialect/MemRef/IR/MemRef.h"
#include "mlir/Dialect/SparseTensor/IR/SparseTensor.h"
#include "mlir/Dialect/SparseTensor/Transforms/Passes.h"
#include "mlir/Dialect/StandardOps/IR/Ops.h"
#include "mlir/Dialect/Tensor/IR/Tensor.h"
#include "mlir/Transforms/DialectConversion.h"
using namespace mlir;
using namespace mlir::sparse_tensor;
namespace {
/// Returns internal type encoding for overhead storage.
static unsigned getOverheadTypeEncoding(unsigned width) {
switch (width) {
default:
return 1;
case 32:
return 2;
case 16:
return 3;
case 8:
return 4;
}
}
/// Returns internal dimension level type encoding.
static unsigned
getDimLevelTypeEncoding(SparseTensorEncodingAttr::DimLevelType dlt) {
switch (dlt) {
case SparseTensorEncodingAttr::DimLevelType::Dense:
return 0;
case SparseTensorEncodingAttr::DimLevelType::Compressed:
return 1;
case SparseTensorEncodingAttr::DimLevelType::Singleton:
return 2;
}
llvm_unreachable("Unknown SparseTensorEncodingAttr::DimLevelType");
}
/// Returns integers of given width and values as a constant tensor.
/// We cast the static shape into a dynamic shape to ensure that the
/// method signature remains uniform accross different tensor dimensions.
static Value getTensor(ConversionPatternRewriter &rewriter, unsigned width,
Location loc, ArrayRef<APInt> values) {
Type etp = rewriter.getIntegerType(width);
unsigned sz = values.size();
RankedTensorType tt1 = RankedTensorType::get({sz}, etp);
RankedTensorType tt2 = RankedTensorType::get({ShapedType::kDynamicSize}, etp);
auto elts =
rewriter.create<ConstantOp>(loc, DenseElementsAttr::get(tt1, values));
return rewriter.create<tensor::CastOp>(loc, tt2, elts);
}
/// Returns function reference (first hit also inserts into module).
static FlatSymbolRefAttr getFunc(Operation *op, StringRef name, Type result,
ValueRange operands) {
MLIRContext *context = op->getContext();
auto module = op->getParentOfType<ModuleOp>();
auto func = module.lookupSymbol<FuncOp>(name);
if (!func) {
OpBuilder moduleBuilder(module.getBodyRegion());
moduleBuilder
.create<FuncOp>(op->getLoc(), name,
FunctionType::get(context, operands.getTypes(), result))
.setPrivate();
}
return SymbolRefAttr::get(context, name);
}
/// Sparse conversion rule for returns.
class SparseReturnConverter : public OpConversionPattern<ReturnOp> {
public:
using OpConversionPattern::OpConversionPattern;
LogicalResult
matchAndRewrite(ReturnOp op, ArrayRef<Value> operands,
ConversionPatternRewriter &rewriter) const override {
rewriter.replaceOpWithNewOp<ReturnOp>(op, operands);
return success();
}
};
/// Sparse conversion rule for dimension accesses.
class SparseTensorToDimSizeConverter
: public OpConversionPattern<tensor::DimOp> {
public:
using OpConversionPattern::OpConversionPattern;
LogicalResult
matchAndRewrite(tensor::DimOp op, ArrayRef<Value> operands,
ConversionPatternRewriter &rewriter) const override {
if (!operands[0].getType().isa<LLVM::LLVMPointerType>())
return failure();
Type resType = op.getType();
StringRef name = "sparseDimSize";
rewriter.replaceOpWithNewOp<CallOp>(
op, resType, getFunc(op, name, resType, operands), operands);
return success();
}
};
/// Sparse conversion rule for the new operator.
class SparseTensorNewConverter : public OpConversionPattern<NewOp> {
using OpConversionPattern::OpConversionPattern;
LogicalResult
matchAndRewrite(NewOp op, ArrayRef<Value> operands,
ConversionPatternRewriter &rewriter) const override {
Location loc = op.getLoc();
Type resType = op.getType();
Type eltType = resType.cast<ShapedType>().getElementType();
MLIRContext *context = op->getContext();
SmallVector<Value, 5> params;
// Sparse encoding.
auto enc = getSparseTensorEncoding(resType);
if (!enc)
return failure();
// User pointer.
params.push_back(operands[0]);
// Sparsity annotations in tensor constant form.
SmallVector<APInt, 4> attrs;
unsigned sz = enc.getDimLevelType().size();
for (unsigned i = 0; i < sz; i++)
attrs.push_back(
APInt(8, getDimLevelTypeEncoding(enc.getDimLevelType()[i])));
params.push_back(getTensor(rewriter, 8, loc, attrs));
// Dimension order permutation array. This is the "identity"
// permutation by default, or otherwise the "reverse" permutation
// of a given ordering, so that indices can be mapped quickly
// to the right position.
SmallVector<APInt, 4> perm(sz);
AffineMap p = enc.getDimOrdering();
if (p) {
assert(p.isPermutation() && p.getNumResults() == sz);
for (unsigned i = 0; i < sz; i++)
perm[p.getDimPosition(i)] = APInt(64, i);
} else {
for (unsigned i = 0; i < sz; i++)
perm[i] = APInt(64, i);
}
params.push_back(getTensor(rewriter, 64, loc, perm));
// Secondary and primary types encoding.
unsigned secPtr = getOverheadTypeEncoding(enc.getPointerBitWidth());
unsigned secInd = getOverheadTypeEncoding(enc.getIndexBitWidth());
unsigned primary;
if (eltType.isF64())
primary = 1;
else if (eltType.isF32())
primary = 2;
else if (eltType.isInteger(32))
primary = 3;
else if (eltType.isInteger(16))
primary = 4;
else if (eltType.isInteger(8))
primary = 5;
else
return failure();
params.push_back(
rewriter.create<ConstantOp>(loc, rewriter.getI64IntegerAttr(secPtr)));
params.push_back(
rewriter.create<ConstantOp>(loc, rewriter.getI64IntegerAttr(secInd)));
params.push_back(
rewriter.create<ConstantOp>(loc, rewriter.getI64IntegerAttr(primary)));
// Generate the call to create new tensor.
Type ptrType = LLVM::LLVMPointerType::get(IntegerType::get(context, 8));
StringRef name = "newSparseTensor";
rewriter.replaceOpWithNewOp<CallOp>(
op, ptrType, getFunc(op, name, ptrType, params), params);
return success();
}
};
/// Sparse conversion rule for pointer accesses.
class SparseTensorToPointersConverter
: public OpConversionPattern<ToPointersOp> {
public:
using OpConversionPattern::OpConversionPattern;
LogicalResult
matchAndRewrite(ToPointersOp op, ArrayRef<Value> operands,
ConversionPatternRewriter &rewriter) const override {
Type resType = op.getType();
Type eltType = resType.cast<ShapedType>().getElementType();
StringRef name;
if (eltType.isIndex())
name = "sparsePointers";
else if (eltType.isInteger(64))
name = "sparsePointers64";
else if (eltType.isInteger(32))
name = "sparsePointers32";
else if (eltType.isInteger(16))
name = "sparsePointers16";
else if (eltType.isInteger(8))
name = "sparsePointers8";
else
return failure();
rewriter.replaceOpWithNewOp<CallOp>(
op, resType, getFunc(op, name, resType, operands), operands);
return success();
}
};
/// Sparse conversion rule for index accesses.
class SparseTensorToIndicesConverter : public OpConversionPattern<ToIndicesOp> {
public:
using OpConversionPattern::OpConversionPattern;
LogicalResult
matchAndRewrite(ToIndicesOp op, ArrayRef<Value> operands,
ConversionPatternRewriter &rewriter) const override {
Type resType = op.getType();
Type eltType = resType.cast<ShapedType>().getElementType();
StringRef name;
if (eltType.isIndex())
name = "sparseIndices";
else if (eltType.isInteger(64))
name = "sparseIndices64";
else if (eltType.isInteger(32))
name = "sparseIndices32";
else if (eltType.isInteger(16))
name = "sparseIndices16";
else if (eltType.isInteger(8))
name = "sparseIndices8";
else
return failure();
rewriter.replaceOpWithNewOp<CallOp>(
op, resType, getFunc(op, name, resType, operands), operands);
return success();
}
};
/// Sparse conversion rule for value accesses.
class SparseTensorToValuesConverter : public OpConversionPattern<ToValuesOp> {
public:
using OpConversionPattern::OpConversionPattern;
LogicalResult
matchAndRewrite(ToValuesOp op, ArrayRef<Value> operands,
ConversionPatternRewriter &rewriter) const override {
Type resType = op.getType();
Type eltType = resType.cast<ShapedType>().getElementType();
StringRef name;
if (eltType.isF64())
name = "sparseValuesF64";
else if (eltType.isF32())
name = "sparseValuesF32";
else if (eltType.isInteger(32))
name = "sparseValuesI32";
else if (eltType.isInteger(16))
name = "sparseValuesI16";
else if (eltType.isInteger(8))
name = "sparseValuesI8";
else
return failure();
rewriter.replaceOpWithNewOp<CallOp>(
op, resType, getFunc(op, name, resType, operands), operands);
return success();
}
};
/// Sparse conversion rule for tensor reconstruction.
class SparseTensorToTensorConverter : public OpConversionPattern<ToTensorOp> {
public:
using OpConversionPattern::OpConversionPattern;
LogicalResult
// Simply fold the operator into the pointer to the sparse storage scheme.
matchAndRewrite(ToTensorOp op, ArrayRef<Value> operands,
ConversionPatternRewriter &rewriter) const override {
// Check that all arguments of the tensor reconstruction operators are calls
// into the support library that query exactly the same opaque pointer.
Value ptr;
for (Value op : operands) {
if (auto call = op.getDefiningOp<CallOp>()) {
Value arg = call.getOperand(0);
if (!arg.getType().isa<LLVM::LLVMPointerType>())
return failure();
if (!ptr)
ptr = arg;
else if (arg != ptr)
return failure();
}
}
// If a single opaque pointer is found, perform the folding.
if (!ptr)
return failure();
rewriter.replaceOp(op, ptr);
return success();
}
};
} // namespace
/// Populates the given patterns list with conversion rules required for
/// the sparsification of linear algebra operations.
void mlir::populateSparseTensorConversionPatterns(TypeConverter &typeConverter,
RewritePatternSet &patterns) {
patterns.add<SparseReturnConverter, SparseTensorToDimSizeConverter,
SparseTensorNewConverter, SparseTensorToPointersConverter,
SparseTensorToIndicesConverter, SparseTensorToValuesConverter,
SparseTensorToTensorConverter>(typeConverter,
patterns.getContext());
}