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// Copyright 2021 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_scalar_matrix_initializers.h"
#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_initializer.h"
#include "src/tint/type/abstract_numeric.h"
#include "src/tint/utils/map.h"
TINT_INSTANTIATE_TYPEINFO(tint::transform::VectorizeScalarMatrixInitializers);
namespace tint::transform {
namespace {
bool ShouldRun(const Program* program) {
for (auto* node : program->ASTNodes().Objects()) {
if (auto* call = program->Sem().Get<sem::Call>(node)) {
if (call->Target()->Is<sem::TypeInitializer>() && call->Type()->Is<type::Matrix>()) {
auto& args = call->Arguments();
if (!args.IsEmpty() && args[0]->Type()->UnwrapRef()->is_scalar()) {
return true;
}
}
}
}
return false;
}
} // namespace
VectorizeScalarMatrixInitializers::VectorizeScalarMatrixInitializers() = default;
VectorizeScalarMatrixInitializers::~VectorizeScalarMatrixInitializers() = default;
Transform::ApplyResult VectorizeScalarMatrixInitializers::Apply(const Program* src,
const DataMap&,
DataMap&) const {
if (!ShouldRun(src)) {
return SkipTransform;
}
ProgramBuilder b;
CloneContext ctx{&b, src, /* auto_clone_symbols */ true};
std::unordered_map<const type::Matrix*, Symbol> scalar_inits;
ctx.ReplaceAll([&](const ast::CallExpression* expr) -> const ast::CallExpression* {
auto* call = src->Sem().Get(expr)->UnwrapMaterialize()->As<sem::Call>();
auto* ty_init = call->Target()->As<sem::TypeInitializer>();
if (!ty_init) {
return nullptr;
}
auto* mat_type = call->Type()->As<type::Matrix>();
if (!mat_type) {
return nullptr;
}
auto& args = call->Arguments();
if (args.IsEmpty()) {
return nullptr;
}
// If the argument type is a matrix, then this is an identity / conversion initializer.
// If the argument type is a vector, then we're already column vectors.
// If the argument type is abstract, then we're const-expression and there's no need to
// adjust this, as it'll be constant folded by the backend.
if (args[0]
->Type()
->UnwrapRef()
->IsAnyOf<type::Matrix, type::Vector, type::AbstractNumeric>()) {
return nullptr;
}
// Constructs a matrix using vector columns, with the elements constructed using the
// 'element(uint32_t c, uint32_t r)' callback.
auto build_mat = [&](auto&& element) {
utils::Vector<const ast::Expression*, 4> columns;
for (uint32_t c = 0; c < mat_type->columns(); c++) {
utils::Vector<const ast::Expression*, 4> row_values;
for (uint32_t r = 0; r < mat_type->rows(); r++) {
row_values.Push(element(c, r));
}
// Construct the column vector.
columns.Push(b.vec(CreateASTTypeFor(ctx, mat_type->type()), mat_type->rows(),
std::move(row_values)));
}
return b.Construct(CreateASTTypeFor(ctx, mat_type), columns);
};
if (args.Length() == 1) {
// Generate a helper function for constructing the matrix.
// This is done to ensure that the single argument value is only evaluated once, and
// with the correct expression evaluation order.
auto fn = utils::GetOrCreate(scalar_inits, mat_type, [&] {
auto name = b.Symbols().New("build_mat" + std::to_string(mat_type->columns()) +
"x" + std::to_string(mat_type->rows()));
b.Func(name,
utils::Vector{
// Single scalar parameter
b.Param("value", CreateASTTypeFor(ctx, mat_type->type())),
},
CreateASTTypeFor(ctx, mat_type),
utils::Vector{
b.Return(build_mat([&](uint32_t, uint32_t) { //
return b.Expr("value");
})),
});
return name;
});
return b.Call(fn, ctx.Clone(args[0]->Declaration()));
}
if (args.Length() == mat_type->columns() * mat_type->rows()) {
return build_mat([&](uint32_t c, uint32_t r) {
return ctx.Clone(args[c * mat_type->rows() + r]->Declaration());
});
}
TINT_ICE(Transform, b.Diagnostics())
<< "matrix initializer has unexpected number of arguments";
return nullptr;
});
ctx.Clone();
return Program(std::move(b));
}
} // namespace tint::transform