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694 lines
27 KiB
694 lines
27 KiB
//===- AffineToStandard.cpp - Lower affine constructs to primitives -------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file lowers affine constructs (If and For statements, AffineApply
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// operations) within a function into their standard If and For equivalent ops.
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//
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//===----------------------------------------------------------------------===//
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#include "mlir/Conversion/AffineToStandard/AffineToStandard.h"
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#include "../PassDetail.h"
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#include "mlir/Dialect/Affine/IR/AffineOps.h"
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#include "mlir/Dialect/SCF/SCF.h"
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#include "mlir/Dialect/StandardOps/IR/Ops.h"
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#include "mlir/Dialect/Vector/VectorOps.h"
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#include "mlir/IR/AffineExprVisitor.h"
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#include "mlir/IR/BlockAndValueMapping.h"
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#include "mlir/IR/Builders.h"
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#include "mlir/IR/IntegerSet.h"
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#include "mlir/IR/MLIRContext.h"
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#include "mlir/Pass/Pass.h"
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#include "mlir/Transforms/DialectConversion.h"
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#include "mlir/Transforms/Passes.h"
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using namespace mlir;
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using namespace mlir::vector;
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namespace {
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/// Visit affine expressions recursively and build the sequence of operations
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/// that correspond to it. Visitation functions return an Value of the
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/// expression subtree they visited or `nullptr` on error.
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class AffineApplyExpander
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: public AffineExprVisitor<AffineApplyExpander, Value> {
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public:
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/// This internal class expects arguments to be non-null, checks must be
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/// performed at the call site.
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AffineApplyExpander(OpBuilder &builder, ValueRange dimValues,
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ValueRange symbolValues, Location loc)
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: builder(builder), dimValues(dimValues), symbolValues(symbolValues),
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loc(loc) {}
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template <typename OpTy> Value buildBinaryExpr(AffineBinaryOpExpr expr) {
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auto lhs = visit(expr.getLHS());
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auto rhs = visit(expr.getRHS());
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if (!lhs || !rhs)
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return nullptr;
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auto op = builder.create<OpTy>(loc, lhs, rhs);
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return op.getResult();
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}
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Value visitAddExpr(AffineBinaryOpExpr expr) {
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return buildBinaryExpr<AddIOp>(expr);
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}
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Value visitMulExpr(AffineBinaryOpExpr expr) {
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return buildBinaryExpr<MulIOp>(expr);
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}
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/// Euclidean modulo operation: negative RHS is not allowed.
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/// Remainder of the euclidean integer division is always non-negative.
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///
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/// Implemented as
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///
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/// a mod b =
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/// let remainder = srem a, b;
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/// negative = a < 0 in
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/// select negative, remainder + b, remainder.
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Value visitModExpr(AffineBinaryOpExpr expr) {
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auto rhsConst = expr.getRHS().dyn_cast<AffineConstantExpr>();
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if (!rhsConst) {
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emitError(
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loc,
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"semi-affine expressions (modulo by non-const) are not supported");
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return nullptr;
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}
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if (rhsConst.getValue() <= 0) {
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emitError(loc, "modulo by non-positive value is not supported");
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return nullptr;
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}
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auto lhs = visit(expr.getLHS());
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auto rhs = visit(expr.getRHS());
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assert(lhs && rhs && "unexpected affine expr lowering failure");
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Value remainder = builder.create<SignedRemIOp>(loc, lhs, rhs);
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Value zeroCst = builder.create<ConstantIndexOp>(loc, 0);
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Value isRemainderNegative =
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builder.create<CmpIOp>(loc, CmpIPredicate::slt, remainder, zeroCst);
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Value correctedRemainder = builder.create<AddIOp>(loc, remainder, rhs);
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Value result = builder.create<SelectOp>(loc, isRemainderNegative,
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correctedRemainder, remainder);
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return result;
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}
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/// Floor division operation (rounds towards negative infinity).
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///
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/// For positive divisors, it can be implemented without branching and with a
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/// single division operation as
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///
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/// a floordiv b =
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/// let negative = a < 0 in
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/// let absolute = negative ? -a - 1 : a in
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/// let quotient = absolute / b in
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/// negative ? -quotient - 1 : quotient
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Value visitFloorDivExpr(AffineBinaryOpExpr expr) {
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auto rhsConst = expr.getRHS().dyn_cast<AffineConstantExpr>();
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if (!rhsConst) {
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emitError(
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loc,
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"semi-affine expressions (division by non-const) are not supported");
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return nullptr;
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}
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if (rhsConst.getValue() <= 0) {
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emitError(loc, "division by non-positive value is not supported");
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return nullptr;
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}
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auto lhs = visit(expr.getLHS());
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auto rhs = visit(expr.getRHS());
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assert(lhs && rhs && "unexpected affine expr lowering failure");
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Value zeroCst = builder.create<ConstantIndexOp>(loc, 0);
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Value noneCst = builder.create<ConstantIndexOp>(loc, -1);
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Value negative =
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builder.create<CmpIOp>(loc, CmpIPredicate::slt, lhs, zeroCst);
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Value negatedDecremented = builder.create<SubIOp>(loc, noneCst, lhs);
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Value dividend =
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builder.create<SelectOp>(loc, negative, negatedDecremented, lhs);
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Value quotient = builder.create<SignedDivIOp>(loc, dividend, rhs);
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Value correctedQuotient = builder.create<SubIOp>(loc, noneCst, quotient);
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Value result =
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builder.create<SelectOp>(loc, negative, correctedQuotient, quotient);
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return result;
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}
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/// Ceiling division operation (rounds towards positive infinity).
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///
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/// For positive divisors, it can be implemented without branching and with a
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/// single division operation as
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///
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/// a ceildiv b =
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/// let negative = a <= 0 in
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/// let absolute = negative ? -a : a - 1 in
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/// let quotient = absolute / b in
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/// negative ? -quotient : quotient + 1
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Value visitCeilDivExpr(AffineBinaryOpExpr expr) {
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auto rhsConst = expr.getRHS().dyn_cast<AffineConstantExpr>();
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if (!rhsConst) {
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emitError(loc) << "semi-affine expressions (division by non-const) are "
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"not supported";
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return nullptr;
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}
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if (rhsConst.getValue() <= 0) {
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emitError(loc, "division by non-positive value is not supported");
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return nullptr;
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}
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auto lhs = visit(expr.getLHS());
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auto rhs = visit(expr.getRHS());
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assert(lhs && rhs && "unexpected affine expr lowering failure");
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Value zeroCst = builder.create<ConstantIndexOp>(loc, 0);
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Value oneCst = builder.create<ConstantIndexOp>(loc, 1);
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Value nonPositive =
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builder.create<CmpIOp>(loc, CmpIPredicate::sle, lhs, zeroCst);
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Value negated = builder.create<SubIOp>(loc, zeroCst, lhs);
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Value decremented = builder.create<SubIOp>(loc, lhs, oneCst);
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Value dividend =
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builder.create<SelectOp>(loc, nonPositive, negated, decremented);
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Value quotient = builder.create<SignedDivIOp>(loc, dividend, rhs);
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Value negatedQuotient = builder.create<SubIOp>(loc, zeroCst, quotient);
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Value incrementedQuotient = builder.create<AddIOp>(loc, quotient, oneCst);
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Value result = builder.create<SelectOp>(loc, nonPositive, negatedQuotient,
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incrementedQuotient);
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return result;
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}
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Value visitConstantExpr(AffineConstantExpr expr) {
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auto valueAttr =
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builder.getIntegerAttr(builder.getIndexType(), expr.getValue());
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auto op =
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builder.create<ConstantOp>(loc, builder.getIndexType(), valueAttr);
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return op.getResult();
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}
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Value visitDimExpr(AffineDimExpr expr) {
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assert(expr.getPosition() < dimValues.size() &&
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"affine dim position out of range");
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return dimValues[expr.getPosition()];
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}
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Value visitSymbolExpr(AffineSymbolExpr expr) {
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assert(expr.getPosition() < symbolValues.size() &&
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"symbol dim position out of range");
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return symbolValues[expr.getPosition()];
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}
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private:
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OpBuilder &builder;
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ValueRange dimValues;
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ValueRange symbolValues;
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Location loc;
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};
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} // namespace
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/// Create a sequence of operations that implement the `expr` applied to the
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/// given dimension and symbol values.
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mlir::Value mlir::expandAffineExpr(OpBuilder &builder, Location loc,
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AffineExpr expr, ValueRange dimValues,
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ValueRange symbolValues) {
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return AffineApplyExpander(builder, dimValues, symbolValues, loc).visit(expr);
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}
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/// Create a sequence of operations that implement the `affineMap` applied to
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/// the given `operands` (as it it were an AffineApplyOp).
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Optional<SmallVector<Value, 8>> mlir::expandAffineMap(OpBuilder &builder,
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Location loc,
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AffineMap affineMap,
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ValueRange operands) {
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auto numDims = affineMap.getNumDims();
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auto expanded = llvm::to_vector<8>(
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llvm::map_range(affineMap.getResults(),
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[numDims, &builder, loc, operands](AffineExpr expr) {
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return expandAffineExpr(builder, loc, expr,
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operands.take_front(numDims),
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operands.drop_front(numDims));
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}));
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if (llvm::all_of(expanded, [](Value v) { return v; }))
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return expanded;
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return None;
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}
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/// Given a range of values, emit the code that reduces them with "min" or "max"
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/// depending on the provided comparison predicate. The predicate defines which
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/// comparison to perform, "lt" for "min", "gt" for "max" and is used for the
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/// `cmpi` operation followed by the `select` operation:
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///
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/// %cond = cmpi "predicate" %v0, %v1
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/// %result = select %cond, %v0, %v1
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///
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/// Multiple values are scanned in a linear sequence. This creates a data
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/// dependences that wouldn't exist in a tree reduction, but is easier to
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/// recognize as a reduction by the subsequent passes.
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static Value buildMinMaxReductionSeq(Location loc, CmpIPredicate predicate,
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ValueRange values, OpBuilder &builder) {
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assert(!llvm::empty(values) && "empty min/max chain");
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auto valueIt = values.begin();
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Value value = *valueIt++;
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for (; valueIt != values.end(); ++valueIt) {
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auto cmpOp = builder.create<CmpIOp>(loc, predicate, value, *valueIt);
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value = builder.create<SelectOp>(loc, cmpOp.getResult(), value, *valueIt);
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}
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return value;
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}
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/// Emit instructions that correspond to computing the maximum value among the
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/// values of a (potentially) multi-output affine map applied to `operands`.
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static Value lowerAffineMapMax(OpBuilder &builder, Location loc, AffineMap map,
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ValueRange operands) {
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if (auto values = expandAffineMap(builder, loc, map, operands))
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return buildMinMaxReductionSeq(loc, CmpIPredicate::sgt, *values, builder);
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return nullptr;
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}
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/// Emit instructions that correspond to computing the minimum value among the
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/// values of a (potentially) multi-output affine map applied to `operands`.
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static Value lowerAffineMapMin(OpBuilder &builder, Location loc, AffineMap map,
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ValueRange operands) {
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if (auto values = expandAffineMap(builder, loc, map, operands))
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return buildMinMaxReductionSeq(loc, CmpIPredicate::slt, *values, builder);
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return nullptr;
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}
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/// Emit instructions that correspond to the affine map in the upper bound
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/// applied to the respective operands, and compute the minimum value across
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/// the results.
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Value mlir::lowerAffineUpperBound(AffineForOp op, OpBuilder &builder) {
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return lowerAffineMapMin(builder, op.getLoc(), op.getUpperBoundMap(),
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op.getUpperBoundOperands());
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}
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/// Emit instructions that correspond to the affine map in the lower bound
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/// applied to the respective operands, and compute the maximum value across
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/// the results.
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Value mlir::lowerAffineLowerBound(AffineForOp op, OpBuilder &builder) {
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return lowerAffineMapMax(builder, op.getLoc(), op.getLowerBoundMap(),
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op.getLowerBoundOperands());
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}
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namespace {
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class AffineMinLowering : public OpRewritePattern<AffineMinOp> {
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public:
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using OpRewritePattern<AffineMinOp>::OpRewritePattern;
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LogicalResult matchAndRewrite(AffineMinOp op,
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PatternRewriter &rewriter) const override {
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Value reduced =
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lowerAffineMapMin(rewriter, op.getLoc(), op.map(), op.operands());
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if (!reduced)
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return failure();
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rewriter.replaceOp(op, reduced);
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return success();
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}
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};
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class AffineMaxLowering : public OpRewritePattern<AffineMaxOp> {
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public:
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using OpRewritePattern<AffineMaxOp>::OpRewritePattern;
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LogicalResult matchAndRewrite(AffineMaxOp op,
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PatternRewriter &rewriter) const override {
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Value reduced =
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lowerAffineMapMax(rewriter, op.getLoc(), op.map(), op.operands());
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if (!reduced)
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return failure();
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rewriter.replaceOp(op, reduced);
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return success();
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}
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};
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/// Affine yields ops are removed.
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class AffineYieldOpLowering : public OpRewritePattern<AffineYieldOp> {
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public:
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using OpRewritePattern<AffineYieldOp>::OpRewritePattern;
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LogicalResult matchAndRewrite(AffineYieldOp op,
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PatternRewriter &rewriter) const override {
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rewriter.replaceOpWithNewOp<scf::YieldOp>(op);
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return success();
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}
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};
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class AffineForLowering : public OpRewritePattern<AffineForOp> {
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public:
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using OpRewritePattern<AffineForOp>::OpRewritePattern;
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LogicalResult matchAndRewrite(AffineForOp op,
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PatternRewriter &rewriter) const override {
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Location loc = op.getLoc();
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Value lowerBound = lowerAffineLowerBound(op, rewriter);
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Value upperBound = lowerAffineUpperBound(op, rewriter);
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Value step = rewriter.create<ConstantIndexOp>(loc, op.getStep());
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auto f = rewriter.create<scf::ForOp>(loc, lowerBound, upperBound, step);
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rewriter.eraseBlock(f.getBody());
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rewriter.inlineRegionBefore(op.region(), f.region(), f.region().end());
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rewriter.eraseOp(op);
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return success();
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}
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};
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/// Convert an `affine.parallel` (loop nest) operation into a `scf.parallel`
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/// operation.
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class AffineParallelLowering : public OpRewritePattern<AffineParallelOp> {
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public:
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using OpRewritePattern<AffineParallelOp>::OpRewritePattern;
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LogicalResult matchAndRewrite(AffineParallelOp op,
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PatternRewriter &rewriter) const override {
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Location loc = op.getLoc();
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SmallVector<Value, 8> steps;
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SmallVector<Value, 8> upperBoundTuple;
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SmallVector<Value, 8> lowerBoundTuple;
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// Finding lower and upper bound by expanding the map expression.
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// Checking if expandAffineMap is not giving NULL.
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Optional<SmallVector<Value, 8>> upperBound = expandAffineMap(
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rewriter, loc, op.upperBoundsMap(), op.getUpperBoundsOperands());
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Optional<SmallVector<Value, 8>> lowerBound = expandAffineMap(
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rewriter, loc, op.lowerBoundsMap(), op.getLowerBoundsOperands());
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if (!lowerBound || !upperBound)
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return failure();
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upperBoundTuple = *upperBound;
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lowerBoundTuple = *lowerBound;
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steps.reserve(op.steps().size());
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for (Attribute step : op.steps())
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steps.push_back(rewriter.create<ConstantIndexOp>(
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loc, step.cast<IntegerAttr>().getInt()));
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// Creating empty scf.parallel op body with appropriate bounds.
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auto parallelOp = rewriter.create<scf::ParallelOp>(loc, lowerBoundTuple,
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upperBoundTuple, steps);
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rewriter.eraseBlock(parallelOp.getBody());
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rewriter.inlineRegionBefore(op.region(), parallelOp.region(),
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parallelOp.region().end());
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rewriter.eraseOp(op);
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return success();
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}
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};
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class AffineIfLowering : public OpRewritePattern<AffineIfOp> {
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public:
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using OpRewritePattern<AffineIfOp>::OpRewritePattern;
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LogicalResult matchAndRewrite(AffineIfOp op,
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PatternRewriter &rewriter) const override {
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auto loc = op.getLoc();
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// Now we just have to handle the condition logic.
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auto integerSet = op.getIntegerSet();
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Value zeroConstant = rewriter.create<ConstantIndexOp>(loc, 0);
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SmallVector<Value, 8> operands(op.getOperands());
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auto operandsRef = llvm::makeArrayRef(operands);
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// Calculate cond as a conjunction without short-circuiting.
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Value cond = nullptr;
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for (unsigned i = 0, e = integerSet.getNumConstraints(); i < e; ++i) {
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AffineExpr constraintExpr = integerSet.getConstraint(i);
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bool isEquality = integerSet.isEq(i);
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// Build and apply an affine expression
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auto numDims = integerSet.getNumDims();
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Value affResult = expandAffineExpr(rewriter, loc, constraintExpr,
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operandsRef.take_front(numDims),
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operandsRef.drop_front(numDims));
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if (!affResult)
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return failure();
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auto pred = isEquality ? CmpIPredicate::eq : CmpIPredicate::sge;
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Value cmpVal =
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rewriter.create<CmpIOp>(loc, pred, affResult, zeroConstant);
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cond =
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cond ? rewriter.create<AndOp>(loc, cond, cmpVal).getResult() : cmpVal;
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}
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cond = cond ? cond
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: rewriter.create<ConstantIntOp>(loc, /*value=*/1, /*width=*/1);
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bool hasElseRegion = !op.elseRegion().empty();
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auto ifOp = rewriter.create<scf::IfOp>(loc, cond, hasElseRegion);
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rewriter.inlineRegionBefore(op.thenRegion(), &ifOp.thenRegion().back());
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rewriter.eraseBlock(&ifOp.thenRegion().back());
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if (hasElseRegion) {
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rewriter.inlineRegionBefore(op.elseRegion(), &ifOp.elseRegion().back());
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rewriter.eraseBlock(&ifOp.elseRegion().back());
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}
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// Ok, we're done!
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rewriter.eraseOp(op);
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return success();
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}
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};
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/// Convert an "affine.apply" operation into a sequence of arithmetic
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/// operations using the StandardOps dialect.
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class AffineApplyLowering : public OpRewritePattern<AffineApplyOp> {
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public:
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using OpRewritePattern<AffineApplyOp>::OpRewritePattern;
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LogicalResult matchAndRewrite(AffineApplyOp op,
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PatternRewriter &rewriter) const override {
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auto maybeExpandedMap =
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expandAffineMap(rewriter, op.getLoc(), op.getAffineMap(),
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llvm::to_vector<8>(op.getOperands()));
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if (!maybeExpandedMap)
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return failure();
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rewriter.replaceOp(op, *maybeExpandedMap);
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return success();
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}
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};
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/// Apply the affine map from an 'affine.load' operation to its operands, and
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/// feed the results to a newly created 'std.load' operation (which replaces the
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/// original 'affine.load').
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class AffineLoadLowering : public OpRewritePattern<AffineLoadOp> {
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public:
|
|
using OpRewritePattern<AffineLoadOp>::OpRewritePattern;
|
|
|
|
LogicalResult matchAndRewrite(AffineLoadOp op,
|
|
PatternRewriter &rewriter) const override {
|
|
// Expand affine map from 'affineLoadOp'.
|
|
SmallVector<Value, 8> indices(op.getMapOperands());
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|
auto resultOperands =
|
|
expandAffineMap(rewriter, op.getLoc(), op.getAffineMap(), indices);
|
|
if (!resultOperands)
|
|
return failure();
|
|
|
|
// Build std.load memref[expandedMap.results].
|
|
rewriter.replaceOpWithNewOp<LoadOp>(op, op.getMemRef(), *resultOperands);
|
|
return success();
|
|
}
|
|
};
|
|
|
|
/// Apply the affine map from an 'affine.prefetch' operation to its operands,
|
|
/// and feed the results to a newly created 'std.prefetch' operation (which
|
|
/// replaces the original 'affine.prefetch').
|
|
class AffinePrefetchLowering : public OpRewritePattern<AffinePrefetchOp> {
|
|
public:
|
|
using OpRewritePattern<AffinePrefetchOp>::OpRewritePattern;
|
|
|
|
LogicalResult matchAndRewrite(AffinePrefetchOp op,
|
|
PatternRewriter &rewriter) const override {
|
|
// Expand affine map from 'affinePrefetchOp'.
|
|
SmallVector<Value, 8> indices(op.getMapOperands());
|
|
auto resultOperands =
|
|
expandAffineMap(rewriter, op.getLoc(), op.getAffineMap(), indices);
|
|
if (!resultOperands)
|
|
return failure();
|
|
|
|
// Build std.prefetch memref[expandedMap.results].
|
|
rewriter.replaceOpWithNewOp<PrefetchOp>(op, op.memref(), *resultOperands,
|
|
op.isWrite(), op.localityHint(),
|
|
op.isDataCache());
|
|
return success();
|
|
}
|
|
};
|
|
|
|
/// Apply the affine map from an 'affine.store' operation to its operands, and
|
|
/// feed the results to a newly created 'std.store' operation (which replaces
|
|
/// the original 'affine.store').
|
|
class AffineStoreLowering : public OpRewritePattern<AffineStoreOp> {
|
|
public:
|
|
using OpRewritePattern<AffineStoreOp>::OpRewritePattern;
|
|
|
|
LogicalResult matchAndRewrite(AffineStoreOp op,
|
|
PatternRewriter &rewriter) const override {
|
|
// Expand affine map from 'affineStoreOp'.
|
|
SmallVector<Value, 8> indices(op.getMapOperands());
|
|
auto maybeExpandedMap =
|
|
expandAffineMap(rewriter, op.getLoc(), op.getAffineMap(), indices);
|
|
if (!maybeExpandedMap)
|
|
return failure();
|
|
|
|
// Build std.store valueToStore, memref[expandedMap.results].
|
|
rewriter.replaceOpWithNewOp<StoreOp>(op, op.getValueToStore(),
|
|
op.getMemRef(), *maybeExpandedMap);
|
|
return success();
|
|
}
|
|
};
|
|
|
|
/// Apply the affine maps from an 'affine.dma_start' operation to each of their
|
|
/// respective map operands, and feed the results to a newly created
|
|
/// 'std.dma_start' operation (which replaces the original 'affine.dma_start').
|
|
class AffineDmaStartLowering : public OpRewritePattern<AffineDmaStartOp> {
|
|
public:
|
|
using OpRewritePattern<AffineDmaStartOp>::OpRewritePattern;
|
|
|
|
LogicalResult matchAndRewrite(AffineDmaStartOp op,
|
|
PatternRewriter &rewriter) const override {
|
|
SmallVector<Value, 8> operands(op.getOperands());
|
|
auto operandsRef = llvm::makeArrayRef(operands);
|
|
|
|
// Expand affine map for DMA source memref.
|
|
auto maybeExpandedSrcMap = expandAffineMap(
|
|
rewriter, op.getLoc(), op.getSrcMap(),
|
|
operandsRef.drop_front(op.getSrcMemRefOperandIndex() + 1));
|
|
if (!maybeExpandedSrcMap)
|
|
return failure();
|
|
// Expand affine map for DMA destination memref.
|
|
auto maybeExpandedDstMap = expandAffineMap(
|
|
rewriter, op.getLoc(), op.getDstMap(),
|
|
operandsRef.drop_front(op.getDstMemRefOperandIndex() + 1));
|
|
if (!maybeExpandedDstMap)
|
|
return failure();
|
|
// Expand affine map for DMA tag memref.
|
|
auto maybeExpandedTagMap = expandAffineMap(
|
|
rewriter, op.getLoc(), op.getTagMap(),
|
|
operandsRef.drop_front(op.getTagMemRefOperandIndex() + 1));
|
|
if (!maybeExpandedTagMap)
|
|
return failure();
|
|
|
|
// Build std.dma_start operation with affine map results.
|
|
rewriter.replaceOpWithNewOp<DmaStartOp>(
|
|
op, op.getSrcMemRef(), *maybeExpandedSrcMap, op.getDstMemRef(),
|
|
*maybeExpandedDstMap, op.getNumElements(), op.getTagMemRef(),
|
|
*maybeExpandedTagMap, op.getStride(), op.getNumElementsPerStride());
|
|
return success();
|
|
}
|
|
};
|
|
|
|
/// Apply the affine map from an 'affine.dma_wait' operation tag memref,
|
|
/// and feed the results to a newly created 'std.dma_wait' operation (which
|
|
/// replaces the original 'affine.dma_wait').
|
|
class AffineDmaWaitLowering : public OpRewritePattern<AffineDmaWaitOp> {
|
|
public:
|
|
using OpRewritePattern<AffineDmaWaitOp>::OpRewritePattern;
|
|
|
|
LogicalResult matchAndRewrite(AffineDmaWaitOp op,
|
|
PatternRewriter &rewriter) const override {
|
|
// Expand affine map for DMA tag memref.
|
|
SmallVector<Value, 8> indices(op.getTagIndices());
|
|
auto maybeExpandedTagMap =
|
|
expandAffineMap(rewriter, op.getLoc(), op.getTagMap(), indices);
|
|
if (!maybeExpandedTagMap)
|
|
return failure();
|
|
|
|
// Build std.dma_wait operation with affine map results.
|
|
rewriter.replaceOpWithNewOp<DmaWaitOp>(
|
|
op, op.getTagMemRef(), *maybeExpandedTagMap, op.getNumElements());
|
|
return success();
|
|
}
|
|
};
|
|
|
|
/// Apply the affine map from an 'affine.vector_load' operation to its operands,
|
|
/// and feed the results to a newly created 'vector.transfer_read' operation
|
|
/// (which replaces the original 'affine.vector_load').
|
|
class AffineVectorLoadLowering : public OpRewritePattern<AffineVectorLoadOp> {
|
|
public:
|
|
using OpRewritePattern<AffineVectorLoadOp>::OpRewritePattern;
|
|
|
|
LogicalResult matchAndRewrite(AffineVectorLoadOp op,
|
|
PatternRewriter &rewriter) const override {
|
|
// Expand affine map from 'affineVectorLoadOp'.
|
|
SmallVector<Value, 8> indices(op.getMapOperands());
|
|
auto resultOperands =
|
|
expandAffineMap(rewriter, op.getLoc(), op.getAffineMap(), indices);
|
|
if (!resultOperands)
|
|
return failure();
|
|
|
|
// Build vector.transfer_read memref[expandedMap.results].
|
|
rewriter.replaceOpWithNewOp<TransferReadOp>(
|
|
op, op.getVectorType(), op.getMemRef(), *resultOperands);
|
|
return success();
|
|
}
|
|
};
|
|
|
|
/// Apply the affine map from an 'affine.vector_store' operation to its
|
|
/// operands, and feed the results to a newly created 'vector.transfer_write'
|
|
/// operation (which replaces the original 'affine.vector_store').
|
|
class AffineVectorStoreLowering : public OpRewritePattern<AffineVectorStoreOp> {
|
|
public:
|
|
using OpRewritePattern<AffineVectorStoreOp>::OpRewritePattern;
|
|
|
|
LogicalResult matchAndRewrite(AffineVectorStoreOp op,
|
|
PatternRewriter &rewriter) const override {
|
|
// Expand affine map from 'affineVectorStoreOp'.
|
|
SmallVector<Value, 8> indices(op.getMapOperands());
|
|
auto maybeExpandedMap =
|
|
expandAffineMap(rewriter, op.getLoc(), op.getAffineMap(), indices);
|
|
if (!maybeExpandedMap)
|
|
return failure();
|
|
|
|
rewriter.replaceOpWithNewOp<TransferWriteOp>(
|
|
op, op.getValueToStore(), op.getMemRef(), *maybeExpandedMap);
|
|
return success();
|
|
}
|
|
};
|
|
|
|
} // end namespace
|
|
|
|
void mlir::populateAffineToStdConversionPatterns(
|
|
OwningRewritePatternList &patterns, MLIRContext *ctx) {
|
|
// clang-format off
|
|
patterns.insert<
|
|
AffineApplyLowering,
|
|
AffineDmaStartLowering,
|
|
AffineDmaWaitLowering,
|
|
AffineLoadLowering,
|
|
AffineMinLowering,
|
|
AffineMaxLowering,
|
|
AffineParallelLowering,
|
|
AffinePrefetchLowering,
|
|
AffineStoreLowering,
|
|
AffineForLowering,
|
|
AffineIfLowering,
|
|
AffineYieldOpLowering>(ctx);
|
|
// clang-format on
|
|
}
|
|
|
|
void mlir::populateAffineToVectorConversionPatterns(
|
|
OwningRewritePatternList &patterns, MLIRContext *ctx) {
|
|
// clang-format off
|
|
patterns.insert<
|
|
AffineVectorLoadLowering,
|
|
AffineVectorStoreLowering>(ctx);
|
|
// clang-format on
|
|
}
|
|
|
|
namespace {
|
|
class LowerAffinePass : public ConvertAffineToStandardBase<LowerAffinePass> {
|
|
void runOnOperation() override {
|
|
OwningRewritePatternList patterns;
|
|
populateAffineToStdConversionPatterns(patterns, &getContext());
|
|
populateAffineToVectorConversionPatterns(patterns, &getContext());
|
|
ConversionTarget target(getContext());
|
|
target
|
|
.addLegalDialect<scf::SCFDialect, StandardOpsDialect, VectorDialect>();
|
|
if (failed(applyPartialConversion(getOperation(), target,
|
|
std::move(patterns))))
|
|
signalPassFailure();
|
|
}
|
|
};
|
|
} // namespace
|
|
|
|
/// Lowers If and For operations within a function into their lower level CFG
|
|
/// equivalent blocks.
|
|
std::unique_ptr<Pass> mlir::createLowerAffinePass() {
|
|
return std::make_unique<LowerAffinePass>();
|
|
}
|