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//===- StdExpandDivs.cpp - Code to prepare Std for lowering Divs to LLVM -===//
//
// 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 Std transformations to expand Divs operation to help for the
// lowering to LLVM. Currently implemented transformations are Ceil and Floor
// for Signed Integers.
//
//===----------------------------------------------------------------------===//
#include "mlir/Dialect/MemRef/Transforms/Passes.h"
#include "mlir/Dialect/Arith/IR/Arith.h"
#include "mlir/Dialect/Arith/Transforms/Passes.h"
#include "mlir/Dialect/MemRef/IR/MemRef.h"
#include "mlir/Dialect/MemRef/Transforms/Transforms.h"
#include "mlir/IR/TypeUtilities.h"
#include "mlir/Transforms/DialectConversion.h"
#include "llvm/ADT/STLExtras.h"
namespace mlir {
namespace memref {
#define GEN_PASS_DEF_EXPANDOPS
#include "mlir/Dialect/MemRef/Transforms/Passes.h.inc"
} // namespace memref
} // namespace mlir
using namespace mlir;
namespace {
/// Converts `atomic_rmw` that cannot be lowered to a simple atomic op with
/// AtomicRMWOpLowering pattern, such as minimum and maximum operations for
/// floating-point numbers, to `memref.generic_atomic_rmw` with the expanded
/// code.
///
/// %x = atomic_rmw maximumf %fval, %F[%i] : (f32, memref<10xf32>) -> f32
///
/// will be lowered to
///
/// %x = memref.generic_atomic_rmw %F[%i] : memref<10xf32> {
/// ^bb0(%current: f32):
/// %1 = arith.maximumf %current, %fval : f32
/// memref.atomic_yield %1 : f32
/// }
struct AtomicRMWOpConverter : public OpRewritePattern<memref::AtomicRMWOp> {
public:
using OpRewritePattern::OpRewritePattern;
LogicalResult matchAndRewrite(memref::AtomicRMWOp op,
PatternRewriter &rewriter) const final {
auto loc = op.getLoc();
auto genericOp = rewriter.create<memref::GenericAtomicRMWOp>(
loc, op.getMemref(), op.getIndices());
OpBuilder bodyBuilder =
OpBuilder::atBlockEnd(genericOp.getBody(), rewriter.getListener());
Value lhs = genericOp.getCurrentValue();
Value rhs = op.getValue();
Value arithOp =
mlir::arith::getReductionOp(op.getKind(), bodyBuilder, loc, lhs, rhs);
bodyBuilder.create<memref::AtomicYieldOp>(loc, arithOp);
rewriter.replaceOp(op, genericOp.getResult());
return success();
}
};
/// Converts `memref.reshape` that has a target shape of a statically-known
/// size to `memref.reinterpret_cast`.
struct MemRefReshapeOpConverter : public OpRewritePattern<memref::ReshapeOp> {
public:
using OpRewritePattern::OpRewritePattern;
LogicalResult matchAndRewrite(memref::ReshapeOp op,
PatternRewriter &rewriter) const final {
auto shapeType = cast<MemRefType>(op.getShape().getType());
if (!shapeType.hasStaticShape())
return failure();
int64_t rank = cast<MemRefType>(shapeType).getDimSize(0);
SmallVector<OpFoldResult, 4> sizes, strides;
sizes.resize(rank);
strides.resize(rank);
Location loc = op.getLoc();
Value stride = rewriter.create<arith::ConstantIndexOp>(loc, 1);
for (int i = rank - 1; i >= 0; --i) {
Value size;
// Load dynamic sizes from the shape input, use constants for static dims.
if (op.getType().isDynamicDim(i)) {
Value index = rewriter.create<arith::ConstantIndexOp>(loc, i);
size = rewriter.create<memref::LoadOp>(loc, op.getShape(), index);
if (!isa<IndexType>(size.getType()))
size = rewriter.create<arith::IndexCastOp>(
loc, rewriter.getIndexType(), size);
sizes[i] = size;
} else {
auto sizeAttr = rewriter.getIndexAttr(op.getType().getDimSize(i));
size = rewriter.create<arith::ConstantOp>(loc, sizeAttr);
sizes[i] = sizeAttr;
}
strides[i] = stride;
if (i > 0)
stride = rewriter.create<arith::MulIOp>(loc, stride, size);
}
rewriter.replaceOpWithNewOp<memref::ReinterpretCastOp>(
op, op.getType(), op.getSource(), /*offset=*/rewriter.getIndexAttr(0),
sizes, strides);
return success();
}
};
struct ExpandOpsPass : public memref::impl::ExpandOpsBase<ExpandOpsPass> {
void runOnOperation() override {
MLIRContext &ctx = getContext();
RewritePatternSet patterns(&ctx);
memref::populateExpandOpsPatterns(patterns);
ConversionTarget target(ctx);
target.addLegalDialect<arith::ArithDialect, memref::MemRefDialect>();
target.addDynamicallyLegalOp<memref::AtomicRMWOp>(
[](memref::AtomicRMWOp op) {
constexpr std::array shouldBeExpandedKinds = {
arith::AtomicRMWKind::maximumf, arith::AtomicRMWKind::minimumf,
arith::AtomicRMWKind::minnumf, arith::AtomicRMWKind::maxnumf};
return !llvm::is_contained(shouldBeExpandedKinds, op.getKind());
});
target.addDynamicallyLegalOp<memref::ReshapeOp>([](memref::ReshapeOp op) {
return !cast<MemRefType>(op.getShape().getType()).hasStaticShape();
});
if (failed(applyPartialConversion(getOperation(), target,
std::move(patterns))))
signalPassFailure();
}
};
} // namespace
void mlir::memref::populateExpandOpsPatterns(RewritePatternSet &patterns) {
patterns.add<AtomicRMWOpConverter, MemRefReshapeOpConverter>(
patterns.getContext());
}
std::unique_ptr<Pass> mlir::memref::createExpandOpsPass() {
return std::make_unique<ExpandOpsPass>();
}
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