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// Copyright 2022 The Tint Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "src/tint/transform/vectorize_matrix_conversions.h"
#include <tuple>
#include <unordered_map>
#include <utility>
#include "src/tint/program_builder.h"
#include "src/tint/sem/call.h"
#include "src/tint/sem/expression.h"
#include "src/tint/sem/type_conversion.h"
#include "src/tint/type/abstract_numeric.h"
#include "src/tint/utils/hash.h"
#include "src/tint/utils/map.h"
TINT_INSTANTIATE_TYPEINFO(tint::transform::VectorizeMatrixConversions);
namespace tint::transform {
namespace {
bool ShouldRun(const Program* program) {
for (auto* node : program->ASTNodes().Objects()) {
if (auto* sem = program->Sem().Get<sem::Expression>(node)) {
if (auto* call = sem->UnwrapMaterialize()->As<sem::Call>()) {
if (call->Target()->Is<sem::TypeConversion>() && call->Type()->Is<type::Matrix>()) {
auto& args = call->Arguments();
if (args.Length() == 1 && args[0]->Type()->UnwrapRef()->is_float_matrix()) {
return true;
}
}
}
}
}
return false;
}
} // namespace
VectorizeMatrixConversions::VectorizeMatrixConversions() = default;
VectorizeMatrixConversions::~VectorizeMatrixConversions() = default;
Transform::ApplyResult VectorizeMatrixConversions::Apply(const Program* src,
const DataMap&,
DataMap&) const {
if (!ShouldRun(src)) {
return SkipTransform;
}
ProgramBuilder b;
CloneContext ctx{&b, src, /* auto_clone_symbols */ true};
using HelperFunctionKey =
utils::UnorderedKeyWrapper<std::tuple<const type::Matrix*, const type::Matrix*>>;
std::unordered_map<HelperFunctionKey, Symbol> matrix_convs;
ctx.ReplaceAll([&](const ast::CallExpression* expr) -> const ast::CallExpression* {
auto* call = src->Sem().Get(expr)->UnwrapMaterialize()->As<sem::Call>();
auto* ty_conv = call->Target()->As<sem::TypeConversion>();
if (!ty_conv) {
return nullptr;
}
auto* dst_type = call->Type()->As<type::Matrix>();
if (!dst_type) {
return nullptr;
}
auto& args = call->Arguments();
if (args.Length() != 1) {
return nullptr;
}
auto& matrix = args[0];
auto* src_type = matrix->Type()->UnwrapRef()->As<type::Matrix>();
if (!src_type) {
return nullptr;
}
// The source and destination type of a matrix conversion must have a same shape.
if (!(src_type->rows() == dst_type->rows() && src_type->columns() == dst_type->columns())) {
TINT_ICE(Transform, b.Diagnostics())
<< "source and destination matrix has different shape in matrix conversion";
return nullptr;
}
auto build_vectorized_conversion_expression = [&](auto&& src_expression_builder) {
utils::Vector<const ast::Expression*, 4> columns;
for (uint32_t c = 0; c < dst_type->columns(); c++) {
auto* src_matrix_expr = src_expression_builder();
auto* src_column_expr = b.IndexAccessor(src_matrix_expr, b.Expr(tint::AInt(c)));
columns.Push(
b.Construct(CreateASTTypeFor(ctx, dst_type->ColumnType()), src_column_expr));
}
return b.Construct(CreateASTTypeFor(ctx, dst_type), columns);
};
// Replace the matrix conversion to column vector conversions and a matrix construction.
if (!matrix->HasSideEffects()) {
// Simply use the argument's declaration if it has no side effects.
return build_vectorized_conversion_expression([&]() { //
return ctx.Clone(matrix->Declaration());
});
} else {
// If has side effects, use a helper function.
auto fn =
utils::GetOrCreate(matrix_convs, HelperFunctionKey{{src_type, dst_type}}, [&] {
auto name = b.Symbols().New(
"convert_mat" + std::to_string(src_type->columns()) + "x" +
std::to_string(src_type->rows()) + "_" + b.FriendlyName(src_type->type()) +
"_" + b.FriendlyName(dst_type->type()));
b.Func(name,
utils::Vector{
b.Param("value", CreateASTTypeFor(ctx, src_type)),
},
CreateASTTypeFor(ctx, dst_type),
utils::Vector{
b.Return(build_vectorized_conversion_expression([&]() { //
return b.Expr("value");
})),
});
return name;
});
return b.Call(fn, ctx.Clone(args[0]->Declaration()));
}
});
ctx.Clone();
return Program(std::move(b));
}
} // namespace tint::transform