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//===- ControlFlowToSPIRV.cpp - ControlFlow 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 standard dialect to SPIR-V dialect.
//
//===----------------------------------------------------------------------===//
#include "mlir/Conversion/ControlFlowToSPIRV/ControlFlowToSPIRV.h"
#include "mlir/Dialect/ControlFlow/IR/ControlFlowOps.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/IR/PatternMatch.h"
#include "mlir/Transforms/DialectConversion.h"
#include "llvm/Support/FormatVariadic.h"
#define DEBUG_TYPE "cf-to-spirv-pattern"
using namespace mlir;
/// Legailze target block arguments.
static LogicalResult legalizeBlockArguments(Block &block, Operation *op,
PatternRewriter &rewriter,
const TypeConverter &converter) {
auto builder = OpBuilder::atBlockBegin(&block);
for (unsigned i = 0; i < block.getNumArguments(); ++i) {
BlockArgument arg = block.getArgument(i);
if (converter.isLegal(arg.getType()))
continue;
Type ty = arg.getType();
Type newTy = converter.convertType(ty);
if (!newTy) {
return rewriter.notifyMatchFailure(
op, llvm::formatv("failed to legalize type for argument {0})", arg));
}
unsigned argNum = arg.getArgNumber();
Location loc = arg.getLoc();
Value newArg = block.insertArgument(argNum, newTy, loc);
Value convertedValue = converter.materializeSourceConversion(
builder, op->getLoc(), ty, newArg);
if (!convertedValue) {
return rewriter.notifyMatchFailure(
op, llvm::formatv("failed to cast new argument {0} to type {1})",
newArg, ty));
}
arg.replaceAllUsesWith(convertedValue);
block.eraseArgument(argNum + 1);
}
return success();
}
//===----------------------------------------------------------------------===//
// Operation conversion
//===----------------------------------------------------------------------===//
namespace {
/// Converts cf.br to spirv.Branch.
struct BranchOpPattern final : OpConversionPattern<cf::BranchOp> {
using OpConversionPattern::OpConversionPattern;
LogicalResult
matchAndRewrite(cf::BranchOp op, OpAdaptor adaptor,
ConversionPatternRewriter &rewriter) const override {
if (failed(legalizeBlockArguments(*op.getDest(), op, rewriter,
*getTypeConverter())))
return failure();
rewriter.replaceOpWithNewOp<spirv::BranchOp>(op, op.getDest(),
adaptor.getDestOperands());
return success();
}
};
/// Converts cf.cond_br to spirv.BranchConditional.
struct CondBranchOpPattern final : OpConversionPattern<cf::CondBranchOp> {
using OpConversionPattern::OpConversionPattern;
LogicalResult
matchAndRewrite(cf::CondBranchOp op, OpAdaptor adaptor,
ConversionPatternRewriter &rewriter) const override {
if (failed(legalizeBlockArguments(*op.getTrueDest(), op, rewriter,
*getTypeConverter())))
return failure();
if (failed(legalizeBlockArguments(*op.getFalseDest(), op, rewriter,
*getTypeConverter())))
return failure();
rewriter.replaceOpWithNewOp<spirv::BranchConditionalOp>(
op, adaptor.getCondition(), op.getTrueDest(),
adaptor.getTrueDestOperands(), op.getFalseDest(),
adaptor.getFalseDestOperands());
return success();
}
};
} // namespace
//===----------------------------------------------------------------------===//
// Pattern population
//===----------------------------------------------------------------------===//
void mlir::cf::populateControlFlowToSPIRVPatterns(
const SPIRVTypeConverter &typeConverter, RewritePatternSet &patterns) {
MLIRContext *context = patterns.getContext();
patterns.add<BranchOpPattern, CondBranchOpPattern>(typeConverter, context);
}
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