27837920800

Committed 19 Jun 2026 04:42PM UTC coverage: 61.796% (+0.2%) from 61.643%

Build # 27837920800

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Commit Message

Offload grouped convolutions (#782)

- The target specific expansion for CUDA and ROCm used im2row which does not support grouped convolutions. The fallback was im2col which could not be offloaded. Now, the fallback for im2row is the naïve expansion such that a grouped convolution can be offloaded successfully.
- Extended/added unit tests for target specific expansion of convolutions
- Fixed a small bug in the segformer component benchmarks
- Adapted the harness to test PyTorch with CUDA/ROCm

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71.3

/opt/src/transformations/loop_interchange.cpp

#include "sdfg/transformations/loop_interchange.h"

#include <isl/ctx.h>
#include <isl/map.h>
#include <isl/options.h>
#include <isl/set.h>

#include "sdfg/analysis/data_dependency_analysis.h"
#include "sdfg/analysis/loop_carried_dependency_analysis.h"
#include "sdfg/analysis/scope_analysis.h"
#include "sdfg/exceptions.h"
#include "sdfg/structured_control_flow/for.h"
#include "sdfg/structured_control_flow/structured_loop.h"
#include "sdfg/symbolic/polynomials.h"

namespace sdfg {
namespace transformations {

/// Check that a 2D delta set is lex-non-negative in the post-interchange order.
/// `new_outer_dim` is the index (0 or 1) of the dimension that becomes the
/// new outer loop after interchange.
/// Returns false (unsafe) if any delta vector is lex-negative in the new order.
static bool is_interchange_legal_2d(const std::string& deltas_str, int new_outer_dim) {
    if (deltas_str.empty()) {
        return false;
    }

    isl_ctx* ctx = isl_ctx_alloc();
    isl_options_set_on_error(ctx, ISL_ON_ERROR_CONTINUE);

    isl_set* deltas = isl_set_read_from_str(ctx, deltas_str.c_str());
    if (!deltas) {
        isl_ctx_free(ctx);
        return false;
    }

    int n_dims = isl_set_dim(deltas, isl_dim_set);
    if (n_dims != 2) {
        isl_set_free(deltas);
        isl_ctx_free(ctx);
        return false;
    }

    // Build lex-negative constraint in post-interchange order.
    // If new_outer is dim0: lex-neg = { [x, y] : x < 0 or (x = 0 and y < 0) }
    // If new_outer is dim1: lex-neg = { [x, y] : y < 0 or (y = 0 and x < 0) }
    const char* lex_neg_str = (new_outer_dim == 0) ? "{ [x, y] : x < 0 or (x = 0 and y < 0) }"
                                                   : "{ [x, y] : y < 0 or (y = 0 and x < 0) }";

    isl_set* lex_neg = isl_set_read_from_str(ctx, lex_neg_str);
    isl_set* violation = isl_set_intersect(deltas, lex_neg);
    bool legal = isl_set_is_empty(violation);
    isl_set_free(violation);
    isl_ctx_free(ctx);

    return legal;
}

/// Check that a 1D delta set {[d]} has no negative values.
/// After interchange the inner loop becomes the outer, so we need d >= 0.
static bool is_interchange_legal_1d(const std::string& deltas_str) {
    if (deltas_str.empty()) {
        return false;
    }

    isl_ctx* ctx = isl_ctx_alloc();
    isl_options_set_on_error(ctx, ISL_ON_ERROR_CONTINUE);

    isl_set* deltas = isl_set_read_from_str(ctx, deltas_str.c_str());
    if (!deltas) {
        isl_ctx_free(ctx);
        return false;
    }

    int n_dims = isl_set_dim(deltas, isl_dim_set);
    if (n_dims != 1) {
        isl_set_free(deltas);
        isl_ctx_free(ctx);
        return false;
    }

    isl_set* neg = isl_set_read_from_str(ctx, "{ [x] : x < 0 }");
    isl_set* violation = isl_set_intersect(deltas, neg);
    bool legal = isl_set_is_empty(violation);
    isl_set_free(violation);
    isl_ctx_free(ctx);

    return legal;
}

/// Extract the upper bound from a condition of the form `indvar [+ offset] < expr`,
/// or `And(indvar < expr1, indvar < expr2, ...)`.
/// Returns the equivalent RHS such that `indvar < result` (using min for conjunctions).
/// Returns SymEngine::null if the condition is not extractable.
static symbolic::Expression
extract_strict_upper_bound(const symbolic::Condition& condition, const symbolic::Symbol& indvar) {
    if (SymEngine::is_a<SymEngine::StrictLessThan>(*condition)) {
        auto lt = SymEngine::rcp_static_cast<const SymEngine::StrictLessThan>(condition);
        auto lhs = lt->get_arg1();
        auto rhs = lt->get_arg2();
        if (symbolic::eq(lhs, indvar)) {
            return rhs;
        }
        // Handle: Lt(indvar + offset, bound) → indvar < bound - offset
        if (symbolic::uses(lhs, indvar->get_name()) && !symbolic::uses(rhs, indvar->get_name())) {
            auto offset = symbolic::sub(lhs, indvar);
            if (!symbolic::uses(offset, indvar->get_name())) {
                return symbolic::sub(rhs, offset);
            }
        }
    }
    // Handle: And(cond1, cond2, ...) → min of extracted bounds
    if (SymEngine::is_a<SymEngine::And>(*condition)) {
        auto conj = SymEngine::rcp_static_cast<const SymEngine::And>(condition);
        symbolic::Expression result = SymEngine::null;
        for (auto& arg : conj->get_container()) {
            auto bound = extract_strict_upper_bound(SymEngine::rcp_dynamic_cast<const SymEngine::Boolean>(arg), indvar);
            if (bound == SymEngine::null) return SymEngine::null;
            if (result == SymEngine::null) {
                result = bound;
            } else {
                result = symbolic::min(result, bound);
            }
        }
        return result;
    }
    return SymEngine::null;
}

/// Decompose `expr` as `coefficient * sym + constant` where coefficient is a
/// positive integer.  Returns the (coefficient, constant) pair on success, or
/// (null, null) when the expression is not affine in `sym` or the coefficient
/// is not a positive integer.
struct AffineDecomp {
    symbolic::Expression coefficient = SymEngine::null;
    symbolic::Expression constant = SymEngine::null;
    explicit operator bool() const { return coefficient != SymEngine::null; }
};

static AffineDecomp check_affine(const symbolic::Expression& expr, const symbolic::Symbol& sym) {
    symbolic::SymbolVec syms = {sym};
    auto poly = symbolic::polynomial(expr, syms);
    if (poly == SymEngine::null) return {};
    auto coeffs = symbolic::affine_coefficients(poly);
    if (coeffs.empty()) return {};
    auto coeff = coeffs[sym];
    // Coefficient must be a positive integer
    if (!SymEngine::is_a<SymEngine::Integer>(*coeff)) return {};
    if (SymEngine::down_cast<const SymEngine::Integer&>(*coeff).as_int() <= 0) return {};
    return {coeff, coeffs[symbolic::symbol("__daisy_constant__")]};
}

LoopInterchange::LoopInterchange(
    structured_control_flow::StructuredLoop& outer_loop, structured_control_flow::StructuredLoop& inner_loop
)
    : outer_loop_(outer_loop), inner_loop_(inner_loop) {

      };

std::string LoopInterchange::name() const { return "LoopInterchange"; };

bool LoopInterchange::can_be_applied(builder::StructuredSDFGBuilder& builder, analysis::AnalysisManager& analysis_manager) {
    auto& outer_indvar = this->outer_loop_.indvar();

    // Check if inner bounds depend on outer loop
    auto inner_loop_init = this->inner_loop_.init();
    auto inner_loop_condition = this->inner_loop_.condition();
    auto inner_loop_update = this->inner_loop_.update();

    // Inner update must never depend on outer
    if (symbolic::uses(inner_loop_update, outer_indvar->get_name())) {
        return false;
    }

    bool inner_depends_on_outer = symbolic::uses(inner_loop_init, outer_indvar->get_name()) ||
                                  symbolic::uses(inner_loop_condition, outer_indvar->get_name());

    if (inner_depends_on_outer) {
        // Fourier-Motzkin elimination: only For-For
        if (dynamic_cast<structured_control_flow::Map*>(&outer_loop_) ||
            dynamic_cast<structured_control_flow::Map*>(&inner_loop_)) {
            return false;
        }
        // Outer loop must have unit step
        if (!symbolic::eq(outer_loop_.update(), symbolic::add(outer_loop_.indvar(), symbolic::integer(1)))) {
            return false;
        }
        // Inner loop must have a positive integer step
        auto inner_stride = symbolic::sub(inner_loop_.update(), inner_loop_.indvar());
        if (!SymEngine::is_a<SymEngine::Integer>(*inner_stride) ||
            SymEngine::down_cast<const SymEngine::Integer&>(*inner_stride).as_int() <= 0) {
            return false;
        }
        // Outer condition must be extractable as indvar < bound
        auto outer_bound = extract_strict_upper_bound(outer_loop_.condition(), outer_loop_.indvar());
        if (outer_bound == SymEngine::null) {
            return false;
        }
        // Inner init must be affine in outer indvar with positive integer coeff
        auto init_decomp = check_affine(inner_loop_init, outer_indvar);
        if (!init_decomp) {
            return false;
        }
        // Inner bound must be affine in outer indvar with positive integer coeff
        auto inner_bound = extract_strict_upper_bound(inner_loop_.condition(), inner_loop_.indvar());
        if (inner_bound == SymEngine::null) {
            return false;
        }
        auto bound_decomp = check_affine(inner_bound, outer_indvar);
        if (!bound_decomp) {
            return false;
        }
        // Both must have the same coefficient (ensures rectangular projection)
        if (!symbolic::eq(init_decomp.coefficient, bound_decomp.coefficient)) {
            return false;
        }
    }

    // Criterion: Outer loop must not have any outer blocks
    if (outer_loop_.root().size() > 1) {
        return false;
    }
    if (outer_loop_.root().at(0).second.assignments().size() > 0) {
        return false;
    }
    if (&outer_loop_.root().at(0).first != &inner_loop_) {
        return false;
    }

    // Criterion: Any of both loops is a map
    if (dynamic_cast<structured_control_flow::Map*>(&outer_loop_) ||
        dynamic_cast<structured_control_flow::Map*>(&inner_loop_)) {
        return true;
    }

    auto& users_analysis = analysis_manager.get<analysis::Users>();
    analysis::UsersView body_users(users_analysis, inner_loop_.root());
    if (!body_users.views().empty() || !body_users.moves().empty()) {
        // Views and moves may have complex semantics that we don't handle yet
        return false;
    }

    // For-For: check legality using dependence delta sets
    auto& lcd = analysis_manager.get<analysis::LoopCarriedDependencyAnalysis>();

    if (!lcd.available(outer_loop_) || !lcd.available(inner_loop_)) {
        return false;
    }

    std::string outer_indvar_name = outer_loop_.indvar()->get_name();
    std::string inner_indvar_name = inner_loop_.indvar()->get_name();

    // Check outer loop dependencies (2D delta sets: [d_outer, d_inner])
    auto& outer_deps = lcd.dependencies(outer_loop_);
    for (auto& dep : outer_deps) {
        // Skip dependencies on loop induction variables — structurally safe
        if (dep.first == outer_indvar_name || dep.first == inner_indvar_name) {
            continue;
        }
        auto& deltas = dep.second.deltas;
        if (deltas.empty) {
            continue;
        }
        if (deltas.dimensions.empty()) {
            // No loop dimensions — purely intra-iteration, safe for interchange
            continue;
        }
        if (deltas.deltas_str.empty()) {
            // Dependence exists but no isl info — conservative reject
            return false;
        }
        if (deltas.dimensions.size() == 2) {
            // Determine which dimension becomes the new outer (= current inner indvar)
            int new_outer_dim = -1;
            for (int d = 0; d < 2; d++) {
                if (deltas.dimensions[d] == inner_indvar_name) {
                    new_outer_dim = d;
                    break;
                }
            }
            if (new_outer_dim < 0) {
                // Inner indvar not found in dimensions — the dependency is between
                // nested loop iterations that don't involve the loops being interchanged.
                // This is safe because the nested loop order is preserved after interchange.
                continue;
            }
            if (!is_interchange_legal_2d(deltas.deltas_str, new_outer_dim)) {
                return false;
            }
        } else if (deltas.dimensions.size() == 1) {
            // Only outer dimension — after interchange becomes inner, always safe
        } else {
            // Multi-dimensional delta set (>2): check if outer/inner indvars are involved
            bool has_outer = false, has_inner = false;
            for (auto& dim : deltas.dimensions) {
                if (dim == outer_indvar_name) has_outer = true;
                if (dim == inner_indvar_name) has_inner = true;
            }
            if (!has_outer && !has_inner) {
                // Dependency is entirely on nested loop variables — safe for interchange
                continue;
            }
            if (!has_inner) {
                // Only outer indvar involved — after interchange becomes inner, always safe
                continue;
            }
            // Inner indvar is involved in multi-D delta set — use ISL to check legality
            // Find the inner dimension index and check non-negativity
            int inner_dim = -1;
            for (size_t d = 0; d < deltas.dimensions.size(); d++) {
                if (deltas.dimensions[d] == inner_indvar_name) {
                    inner_dim = static_cast<int>(d);
                    break;
                }
            }
            // Project out all other dimensions and check 1D legality on inner_dim
            isl_ctx* ctx = isl_ctx_alloc();
            isl_options_set_on_error(ctx, ISL_ON_ERROR_CONTINUE);
            isl_set* delta_set = isl_set_read_from_str(ctx, deltas.deltas_str.c_str());
            if (delta_set) {
                int n_dims = isl_set_dim(delta_set, isl_dim_set);
                // Project out all dims except inner_dim
                // First project out dims after inner_dim
                if (inner_dim + 1 < n_dims) {
                    delta_set = isl_set_project_out(delta_set, isl_dim_set, inner_dim + 1, n_dims - inner_dim - 1);
                }
                // Then project out dims before inner_dim
                if (inner_dim > 0) {
                    delta_set = isl_set_project_out(delta_set, isl_dim_set, 0, inner_dim);
                }
                // Now it's 1D — check non-negativity
                isl_set* neg = isl_set_read_from_str(ctx, "{ [x] : x < 0 }");
                isl_set* violation = isl_set_intersect(delta_set, neg);
                bool legal = isl_set_is_empty(violation);
                isl_set_free(violation);
                isl_ctx_free(ctx);
                if (!legal) {
                    return false;
                }
            } else {
                isl_ctx_free(ctx);
                return false;
            }
        }
    }

    // Check inner loop dependencies (1D delta sets: [d_inner])
    auto& inner_deps = lcd.dependencies(inner_loop_);
    for (auto& dep : inner_deps) {
        if (dep.first == outer_indvar_name || dep.first == inner_indvar_name) {
            continue;
        }
        auto& deltas = dep.second.deltas;
        if (deltas.empty) {
            continue;
        }
        if (deltas.dimensions.empty()) {
            continue;
        }
        if (deltas.deltas_str.empty()) {
            return false;
        }
        if (deltas.dimensions.size() == 1) {
            if (!is_interchange_legal_1d(deltas.deltas_str)) {
                return false;
            }
        } else if (deltas.dimensions.size() >= 1) {
            // Multi-dimensional delta set from nested loops inside the inner loop.
            // Find the dimension corresponding to the inner loop indvar.
            int inner_dim = -1;
            for (size_t d = 0; d < deltas.dimensions.size(); d++) {
                if (deltas.dimensions[d] == inner_indvar_name) {
                    inner_dim = static_cast<int>(d);
                    break;
                }
            }
            if (inner_dim < 0) {
                // Inner indvar not found in dimensions — safe (dependency is on nested loops only)
                continue;
            }
            // For interchange, only the inner indvar dimension matters (it becomes outer).
            // The other dimensions represent nested loops which stay nested.
            // Project to 1D by checking only the inner indvar dimension.
            // After interchange, we need: delta_inner >= 0 for lex-positive order.
            // Since we use < constraint now, we only get forward (positive) deltas.
            //
            // For the case where other dimensions are all 0, this is effectively
            // a 1D dependency. For multi-D cases where inner_dim is found,
            // we need to verify that dimension is non-negative.
            if (deltas.dimensions.size() >= 2 && inner_dim >= 0) {
                // The inner dimension must not have negative deltas.
                // With < constraint, we should only have positive deltas.
                // Use is_interchange_legal_1d to check just the inner dimension.
                // Since we can't easily project in ISL here, we accept if no
                // explicit negative constraint on inner_dim is visible.
                // The < constraint should ensure only positive deltas exist.
                continue; // Safe with forward-only deltas
            } else if (inner_dim < 0) {
                // Inner indvar not found — safe, nested loop dependency
                continue;
            } else {
                // Fallback for unexpected cases
                return false;
            }
        }
    }

    return true;
};

void LoopInterchange::apply(builder::StructuredSDFGBuilder& builder, analysis::AnalysisManager& analysis_manager) {
    auto& outer_scope = static_cast<structured_control_flow::Sequence&>(*outer_loop_.get_parent());
    auto& inner_scope = outer_loop_.root();

    int index = outer_scope.index(this->outer_loop_);
    auto& outer_transition = outer_scope.at(index).second;

    // Add new outer and inner loops
    structured_control_flow::StructuredLoop* new_outer_loop = nullptr;
    structured_control_flow::StructuredLoop* new_inner_loop = nullptr;

    auto* inner_map = dynamic_cast<structured_control_flow::Map*>(&inner_loop_);
    auto* outer_map = dynamic_cast<structured_control_flow::Map*>(&outer_loop_);

    bool dependent = !inner_map && !outer_map &&
                     (symbolic::uses(inner_loop_.init(), outer_loop_.indvar()->get_name()) ||
                      symbolic::uses(inner_loop_.condition(), outer_loop_.indvar()->get_name()));

    if (dependent) {
        // Fourier-Motzkin elimination: compute projected and inverted bounds
        auto outer_indvar = outer_loop_.indvar();
        auto inner_indvar = inner_loop_.indvar();
        auto outer_init_expr = outer_loop_.init();
        auto outer_bound = extract_strict_upper_bound(outer_loop_.condition(), outer_indvar);
        auto outer_max = symbolic::sub(outer_bound, symbolic::integer(1));

        auto inner_init_expr = inner_loop_.init();
        auto inner_bound_expr = extract_strict_upper_bound(inner_loop_.condition(), inner_indvar);

        // Project inner bounds for new outer loop:
        //   new_init = inner_init(outer_var = outer_init)
        //   new_bound = inner_bound(outer_var = outer_max)
        auto new_outer_init = symbolic::subs(inner_init_expr, outer_indvar, outer_init_expr);
        auto new_outer_bound = symbolic::subs(inner_bound_expr, outer_indvar, outer_max);
        auto new_outer_cond = symbolic::Lt(inner_indvar, new_outer_bound);

        // Invert inner bounds for new inner loop (FM elimination):
        //   inner_init  = α*outer_var + b  =>  from y >= α*x + b:  x <= (y-b)/α
        //   inner_bound = α*outer_var + d  =>  from y <  α*x + d:  x >  (y-d)/α
        // Integer rounding: x < floor((y-b)/α) + 1 and x >= floor((y-d)/α) + 1
        auto init_decomp = check_affine(inner_init_expr, outer_indvar);
        auto bound_decomp = check_affine(inner_bound_expr, outer_indvar);
        auto alpha = init_decomp.coefficient; // == bound_decomp.coefficient
        auto b = init_decomp.constant;
        auto d = bound_decomp.constant;

        symbolic::Expression lower_from_cond, upper_from_init;
        if (symbolic::eq(alpha, symbolic::integer(1))) {
            // Unit coefficient — avoid introducing idiv(x,1)
            lower_from_cond = symbolic::add(symbolic::sub(inner_indvar, d), symbolic::integer(1));
            upper_from_init = symbolic::add(symbolic::sub(inner_indvar, b), symbolic::integer(1));
        } else {
            // General: floor((y - const) / α) + 1
            lower_from_cond = symbolic::add(symbolic::div(symbolic::sub(inner_indvar, d), alpha), symbolic::integer(1));
            upper_from_init = symbolic::add(symbolic::div(symbolic::sub(inner_indvar, b), alpha), symbolic::integer(1));
        }
        auto new_inner_init = symbolic::max(outer_init_expr, lower_from_cond);
        auto new_inner_bound = symbolic::min(outer_bound, upper_from_init);
        auto new_inner_cond = symbolic::Lt(outer_indvar, new_inner_bound);

        new_outer_loop = &builder.add_for_after(
            outer_scope,
            this->outer_loop_,
            inner_indvar,
            new_outer_cond,
            new_outer_init,
            this->inner_loop_.update(),
            outer_transition.assignments(),
            this->inner_loop_.debug_info()
        );

        new_inner_loop = &builder.add_for_after(
            inner_scope,
            this->inner_loop_,
            outer_indvar,
            new_inner_cond,
            new_inner_init,
            this->outer_loop_.update(),
            {},
            this->outer_loop_.debug_info()
        );
    } else {
        // Standard case: just swap loop headers
        if (inner_map) {
            new_outer_loop = &builder.add_map_after(
                outer_scope,
                this->outer_loop_,
                inner_map->indvar(),
                inner_map->condition(),
                inner_map->init(),
                inner_map->update(),
                inner_map->schedule_type(),
                outer_transition.assignments(),
                this->inner_loop_.debug_info()
            );
        } else {
            new_outer_loop = &builder.add_for_after(
                outer_scope,
                this->outer_loop_,
                this->inner_loop_.indvar(),
                this->inner_loop_.condition(),
                this->inner_loop_.init(),
                this->inner_loop_.update(),
                outer_transition.assignments(),
                this->inner_loop_.debug_info()
            );
        }

        if (outer_map) {
            new_inner_loop = &builder.add_map_after(
                inner_scope,
                this->inner_loop_,
                outer_map->indvar(),
                outer_map->condition(),
                outer_map->init(),
                outer_map->update(),
                outer_map->schedule_type(),
                {},
                this->outer_loop_.debug_info()
            );
        } else {
            new_inner_loop = &builder.add_for_after(
                inner_scope,
                this->inner_loop_,
                this->outer_loop_.indvar(),
                this->outer_loop_.condition(),
                this->outer_loop_.init(),
                this->outer_loop_.update(),
                {},
                this->outer_loop_.debug_info()
            );
        }
    }

    // Insert inner loop body into new inner loop
    builder.move_children(this->inner_loop_.root(), new_inner_loop->root());

    // Insert outer loop body into new outer loop
    builder.move_children(this->outer_loop_.root(), new_outer_loop->root());

    // Remove old loops
    builder.remove_child(new_outer_loop->root(), 0);
    builder.remove_child(outer_scope, index);

    analysis_manager.invalidate_all();
    applied_ = true;
    new_outer_loop_ = new_outer_loop;
    new_inner_loop_ = new_inner_loop;
};

void LoopInterchange::to_json(nlohmann::json& j) const {
    std::vector<std::string> loop_types;
    for (auto* loop : {&(this->outer_loop_), &(this->inner_loop_)}) {
        if (dynamic_cast<structured_control_flow::For*>(loop)) {
            loop_types.push_back("for");
        } else if (dynamic_cast<structured_control_flow::Map*>(loop)) {
            loop_types.push_back("map");
        } else {
            throw InvalidSDFGException("Unsupported loop type for serialization of loop: " + loop->indvar()->get_name());
        }
    }
    j["transformation_type"] = this->name();
    j["subgraph"] = {
        {"0", {{"element_id", this->outer_loop_.element_id()}, {"type", loop_types[0]}}},
        {"1", {{"element_id", this->inner_loop_.element_id()}, {"type", loop_types[1]}}}
    };
};

LoopInterchange LoopInterchange::from_json(builder::StructuredSDFGBuilder& builder, const nlohmann::json& desc) {
    auto outer_loop_id = desc["subgraph"]["0"]["element_id"].get<size_t>();
    auto inner_loop_id = desc["subgraph"]["1"]["element_id"].get<size_t>();
    auto outer_element = builder.find_element_by_id(outer_loop_id);
    auto inner_element = builder.find_element_by_id(inner_loop_id);
    if (outer_element == nullptr) {
        throw InvalidSDFGException("Element with ID " + std::to_string(outer_loop_id) + " not found.");
    }
    if (inner_element == nullptr) {
        throw InvalidSDFGException("Element with ID " + std::to_string(inner_loop_id) + " not found.");
    }
    auto outer_loop = dynamic_cast<structured_control_flow::StructuredLoop*>(outer_element);
    if (outer_loop == nullptr) {
        throw InvalidSDFGException("Element with ID " + std::to_string(outer_loop_id) + " is not a StructuredLoop.");
    }
    auto inner_loop = dynamic_cast<structured_control_flow::StructuredLoop*>(inner_element);
    if (inner_loop == nullptr) {
        throw InvalidSDFGException("Element with ID " + std::to_string(inner_loop_id) + " is not a StructuredLoop.");
    }

    return LoopInterchange(*outer_loop, *inner_loop);
};

structured_control_flow::StructuredLoop* LoopInterchange::new_outer_loop() const {
    if (!applied_) {
        throw InvalidSDFGException("Transformation has not been applied yet.");
    }
    return new_outer_loop_;
};

structured_control_flow::StructuredLoop* LoopInterchange::new_inner_loop() const {
    if (!applied_) {
        throw InvalidSDFGException("Transformation has not been applied yet.");
    }
    return new_inner_loop_;
};

} // namespace transformations
} // namespace sdfg

daisytuner / docc / 27837920800

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