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// Copyright 2023 The Dawn & Tint Authors
//
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#include "src/tint/lang/core/ir/transform/vectorize_scalar_matrix_constructors.h"
#include <utility>
#include "src/tint/lang/core/ir/builder.h"
#include "src/tint/lang/core/ir/module.h"
#include "src/tint/lang/core/ir/validator.h"
using namespace tint::core::fluent_types; // NOLINT
using namespace tint::core::number_suffixes; // NOLINT
namespace tint::core::ir::transform {
namespace {
/// PIMPL state for the transform.
struct State {
/// The IR module.
Module& ir;
/// The IR builder.
Builder b{ir};
/// The type manager.
core::type::Manager& ty{ir.Types()};
/// Process the module.
void Process() {
// Find and replace matrix constructors that take scalar operands.
Vector<Construct*, 8> worklist;
for (auto inst : ir.Instructions()) {
if (auto* construct = inst->As<Construct>()) {
if (construct->Result(0)->Type()->As<type::Matrix>()) {
if (construct->Operands().Length() > 0 &&
construct->Operands()[0]->Type()->Is<type::Scalar>()) {
b.InsertBefore(construct, [&] { //
ReplaceConstructor(construct);
});
}
}
}
}
}
/// Replace a matrix construct instruction.
/// @param construct the instruction to replace
void ReplaceConstructor(Construct* construct) {
auto* mat = construct->Result(0)->Type()->As<type::Matrix>();
auto* col = mat->ColumnType();
const auto& scalars = construct->Operands();
// Collect consecutive scalars into column vectors.
Vector<Value*, 4> columns;
for (uint32_t c = 0; c < mat->columns(); c++) {
Vector<Value*, 4> values;
for (uint32_t r = 0; r < col->Width(); r++) {
values.Push(scalars[c * col->Width() + r]);
}
columns.Push(b.Construct(col, std::move(values))->Result(0));
}
// Construct the matrix from the column vectors and replace the original instruction.
auto* replacement = b.Construct(mat, std::move(columns))->Result(0);
construct->Result(0)->ReplaceAllUsesWith(replacement);
construct->Destroy();
}
};
} // namespace
Result<SuccessType> VectorizeScalarMatrixConstructors(Module& ir) {
auto result = ValidateAndDumpIfNeeded(ir, "VectorizeScalarMatrixConstructors transform");
if (result != Success) {
return result;
}
State{ir}.Process();
return Success;
}
} // namespace tint::core::ir::transform