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//===- ConvertToReplicatedConstantCompositePass.cpp -----------------------===//
//
// 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 a pass to convert a splat composite spirv.Constant and
// spirv.SpecConstantComposite to spirv.EXT.ConstantCompositeReplicate and
// spirv.EXT.SpecConstantCompositeReplicate respectively.
//
//===----------------------------------------------------------------------===//
#include "mlir/Dialect/SPIRV/IR/SPIRVOps.h"
#include "mlir/Dialect/SPIRV/Transforms/Passes.h"
#include "mlir/Transforms/WalkPatternRewriteDriver.h"
namespace mlir::spirv {
#define GEN_PASS_DEF_SPIRVREPLICATEDCONSTANTCOMPOSITEPASS
#include "mlir/Dialect/SPIRV/Transforms/Passes.h.inc"
namespace {
static Type getArrayElemType(Attribute attr) {
if (auto typedAttr = dyn_cast<TypedAttr>(attr)) {
return typedAttr.getType();
}
if (auto arrayAttr = dyn_cast<ArrayAttr>(attr)) {
return ArrayType::get(getArrayElemType(arrayAttr[0]), arrayAttr.size());
}
return nullptr;
}
static std::pair<Attribute, uint32_t>
getSplatAttrAndNumElements(Attribute valueAttr, Type valueType) {
auto compositeType = dyn_cast_or_null<spirv::CompositeType>(valueType);
if (!compositeType)
return {nullptr, 1};
if (auto splatAttr = dyn_cast<SplatElementsAttr>(valueAttr)) {
return {splatAttr.getSplatValue<Attribute>(), splatAttr.size()};
}
if (auto arrayAttr = dyn_cast<ArrayAttr>(valueAttr)) {
if (llvm::all_equal(arrayAttr)) {
Attribute attr = arrayAttr[0];
uint32_t numElements = arrayAttr.size();
// Find the inner-most splat value for array of composites
auto [newAttr, newNumElements] =
getSplatAttrAndNumElements(attr, getArrayElemType(attr));
if (newAttr) {
attr = newAttr;
numElements *= newNumElements;
}
return {attr, numElements};
}
}
return {nullptr, 1};
}
struct ConstantOpConversion final : OpRewritePattern<spirv::ConstantOp> {
using Base::Base;
LogicalResult matchAndRewrite(spirv::ConstantOp op,
PatternRewriter &rewriter) const override {
auto [attr, numElements] =
getSplatAttrAndNumElements(op.getValue(), op.getType());
if (!attr)
return rewriter.notifyMatchFailure(op, "composite is not splat");
if (numElements == 1)
return rewriter.notifyMatchFailure(op,
"composite has only one constituent");
rewriter.replaceOpWithNewOp<spirv::EXTConstantCompositeReplicateOp>(
op, op.getType(), attr);
return success();
}
};
struct SpecConstantCompositeOpConversion final
: OpRewritePattern<spirv::SpecConstantCompositeOp> {
using Base::Base;
LogicalResult matchAndRewrite(spirv::SpecConstantCompositeOp op,
PatternRewriter &rewriter) const override {
auto compositeType = dyn_cast_or_null<spirv::CompositeType>(op.getType());
if (!compositeType)
return rewriter.notifyMatchFailure(op, "not a composite constant");
ArrayAttr constituents = op.getConstituents();
if (constituents.size() == 1)
return rewriter.notifyMatchFailure(op,
"composite has only one consituent");
if (!llvm::all_equal(constituents))
return rewriter.notifyMatchFailure(op, "composite is not splat");
auto splatConstituent = dyn_cast<FlatSymbolRefAttr>(constituents[0]);
if (!splatConstituent)
return rewriter.notifyMatchFailure(
op, "expected flat symbol reference for splat constituent");
rewriter.replaceOpWithNewOp<spirv::EXTSpecConstantCompositeReplicateOp>(
op, TypeAttr::get(op.getType()), op.getSymNameAttr(), splatConstituent);
return success();
}
};
struct ConvertToReplicatedConstantCompositePass final
: spirv::impl::SPIRVReplicatedConstantCompositePassBase<
ConvertToReplicatedConstantCompositePass> {
void runOnOperation() override {
MLIRContext *context = &getContext();
RewritePatternSet patterns(context);
patterns.add<ConstantOpConversion, SpecConstantCompositeOpConversion>(
context);
walkAndApplyPatterns(getOperation(), std::move(patterns));
}
};
} // namespace
} // namespace mlir::spirv
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