sdfg::transformations::TrivialLoopElimination Class Reference

Eliminates a trivial map, i.e., a map executing exactly one iteration. More...

#include <sdfg/transformations/trivial_loop_elimination.h>

Inheritance diagram for sdfg::transformations::TrivialLoopElimination:

Public Member Functions
	TrivialLoopElimination (structured_control_flow::Map &loop)
virtual std::string	name () const override
	Get the name of this transformation.
virtual bool	can_be_applied (builder::StructuredSDFGBuilder &builder, analysis::AnalysisManager &analysis_manager) override
	Check if this transformation can be safely applied.
virtual void	apply (builder::StructuredSDFGBuilder &builder, analysis::AnalysisManager &analysis_manager) override
	Apply this transformation to the SDFG.
virtual void	to_json (nlohmann::json &j) const override
	Serialize this transformation to JSON.
Public Member Functions inherited from sdfg::transformations::Transformation
virtual	~Transformation ()=default
virtual void	set_report (PassReportConsumer *report)
	Set the report consumer for transformation feedback.
virtual bool	try_apply (builder::StructuredSDFGBuilder &builder, analysis::AnalysisManager &analysis_manager)
	Attempt to apply the transformation if possible.

Static Public Member Functions
static TrivialLoopElimination	from_json (builder::StructuredSDFGBuilder &builder, const nlohmann::json &j)

Additional Inherited Members
Protected Attributes inherited from sdfg::transformations::Transformation
PassReportConsumer *	report_ = nullptr

Detailed Description

Eliminates a trivial map, i.e., a map executing exactly one iteration.

Original: map (i = init; i < init + 1; i++) body(i)

After TrivialLoopElimination: body(init)

Symbolic uses of the induction variable are replaced by init. Data accesses to the induction variable container are replaced by a constant (integer init), renamed (symbolic init) or kept and fed by an assignment i = init otherwise.

Prerequisites:

• Sequential schedule (non-sequential maps carry semantics beyond their iterations, e.g., a single-wave GPU map defines 64 lanes)
• Unit stride
• Trip count is exactly 1
• Parent is a sequence

Constructor & Destructor Documentation

TrivialLoopElimination()

sdfg::transformations::TrivialLoopElimination::TrivialLoopElimination ( structured_control_flow::Map & loop )

explicit

Member Function Documentation

apply()

virtual void sdfg::transformations::TrivialLoopElimination::apply ( builder::StructuredSDFGBuilder & builder, analysis::AnalysisManager & analysis_manager )

overridevirtual

Apply this transformation to the SDFG.

Parameters

builder	The SDFG builder
analysis_manager	The analysis manager (may be invalidated)

Implements sdfg::transformations::Transformation.

can_be_applied()

virtual bool sdfg::transformations::TrivialLoopElimination::can_be_applied ( builder::StructuredSDFGBuilder & builder, analysis::AnalysisManager & analysis_manager )

overridevirtual

Check if this transformation can be safely applied.

Parameters

builder	The SDFG builder
analysis_manager	The analysis manager providing necessary analyses

Returns

true if all preconditions are met

Implements sdfg::transformations::Transformation.

from_json()

TrivialLoopElimination sdfg::transformations::TrivialLoopElimination::from_json ( builder::StructuredSDFGBuilder & builder, const nlohmann::json & j )

static

name()

virtual std::string sdfg::transformations::TrivialLoopElimination::name ( ) const

overridevirtual

Get the name of this transformation.

Returns

The transformation name (e.g., "LoopInterchange")

Implements sdfg::transformations::Transformation.

to_json()

virtual void sdfg::transformations::TrivialLoopElimination::to_json ( nlohmann::json & j ) const

overridevirtual

Serialize this transformation to JSON.

Parameters

j	JSON object to populate with transformation description

Exceptions

std::logic_error

if not implemented

Implements sdfg::transformations::Transformation.

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The documentation for this class was generated from the following file:

• opt/include/sdfg/transformations/trivial_loop_elimination.h