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//===- FuncToSPIRV.cpp - Func to SPIR-V Patterns ------------------===//
//
// 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 patterns to convert Func dialect to SPIR-V dialect.
//
//===----------------------------------------------------------------------===//
#include "mlir/Conversion/FuncToSPIRV/FuncToSPIRV.h"
#include "../SPIRVCommon/Pattern.h"
#include "mlir/Dialect/Func/IR/FuncOps.h"
#include "mlir/Dialect/SPIRV/IR/SPIRVDialect.h"
#include "mlir/Dialect/SPIRV/IR/SPIRVOps.h"
#include "mlir/Dialect/SPIRV/Transforms/SPIRVConversion.h"
#include "mlir/Dialect/SPIRV/Utils/LayoutUtils.h"
#include "mlir/IR/AffineMap.h"
#include "mlir/Support/LogicalResult.h"
#include "llvm/Support/Debug.h"
#define DEBUG_TYPE "func-to-spirv-pattern"
using namespace mlir;
//===----------------------------------------------------------------------===//
// Operation conversion
//===----------------------------------------------------------------------===//
// Note that DRR cannot be used for the patterns in this file: we may need to
// convert type along the way, which requires ConversionPattern. DRR generates
// normal RewritePattern.
namespace {
/// Converts func.return to spirv.Return.
class ReturnOpPattern final : public OpConversionPattern<func::ReturnOp> {
public:
using OpConversionPattern<func::ReturnOp>::OpConversionPattern;
LogicalResult
matchAndRewrite(func::ReturnOp returnOp, OpAdaptor adaptor,
ConversionPatternRewriter &rewriter) const override {
if (returnOp.getNumOperands() > 1)
return failure();
if (returnOp.getNumOperands() == 1) {
rewriter.replaceOpWithNewOp<spirv::ReturnValueOp>(
returnOp, adaptor.getOperands()[0]);
} else {
rewriter.replaceOpWithNewOp<spirv::ReturnOp>(returnOp);
}
return success();
}
};
/// Converts func.call to spirv.FunctionCall.
class CallOpPattern final : public OpConversionPattern<func::CallOp> {
public:
using OpConversionPattern<func::CallOp>::OpConversionPattern;
LogicalResult
matchAndRewrite(func::CallOp callOp, OpAdaptor adaptor,
ConversionPatternRewriter &rewriter) const override {
// multiple results func was not converted to spirv.func
if (callOp.getNumResults() > 1)
return failure();
if (callOp.getNumResults() == 1) {
auto resultType =
getTypeConverter()->convertType(callOp.getResult(0).getType());
if (!resultType)
return failure();
rewriter.replaceOpWithNewOp<spirv::FunctionCallOp>(
callOp, resultType, adaptor.getOperands(), callOp->getAttrs());
} else {
rewriter.replaceOpWithNewOp<spirv::FunctionCallOp>(
callOp, TypeRange(), adaptor.getOperands(), callOp->getAttrs());
}
return success();
}
};
} // namespace
//===----------------------------------------------------------------------===//
// Pattern population
//===----------------------------------------------------------------------===//
void mlir::populateFuncToSPIRVPatterns(SPIRVTypeConverter &typeConverter,
RewritePatternSet &patterns) {
MLIRContext *context = patterns.getContext();
patterns.add<ReturnOpPattern, CallOpPattern>(typeConverter, context);
}
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