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Topic: Static single assignment form

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Compiler optimization

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GIMPLE

Register Transfer Language

GNU Compiler Collection

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	Apparatus and method for incrementally update static single assignment form for cloned variable name definitions - ...
		A single phi-function is inserted in each node in the iterative dominance frontier set and is assigned to a new cloned variable name.
		First, a single phi-function is inserted as the first instruction in each node that is within the iterative dominance frontiers of the nodes that contain a cloned variable name or original variable name definition (step 320).
		The set, allDefResSet 252, was formed at the outset of the procedure 226 and includes all the original variable names, the cloned variable names that were inserted by the program transformation procedure 224, and the cloned variable names that correspond to the phi-function definitions that were inserted by the incremental SSA update procedure 226.
	www.freepatentsonline.com /6249910.html (5874 words)

	Citations: Single-pass generation of static single assignment form for structured languages - Brandis, Mossenbock ...
		....Assignment Form Static single assignment (SSA) form is an intermediate representation widely used in FORTRAN compilers.
		Although, SSA form has become very popular in FORTRAN compilers, it has not enjoyed such popularity among languages with multi level pointers such as C. We propose to introduce the properties of SSA form into compilers for languages with multi level pointers such as C, using a new dataflow....
		Parallel Static Single Assignment Form and Constant Propagation..
	citeseer.ist.psu.edu /context/143426/115867 (3542 words)

	Static Single-Assignment Form
		The one (static) definition-site may be in a loop that is executed many (dynamic) times, thus the name static single-assignment form.
		An example of the use of SSA form is shown in figure 1.
		Analysis, transformation, and optimization of the IR is simplified by its SSA form.
	cycleserv2.csail.mit.edu /Harpoon/quads/node3.html (458 words)

	Method for constructing a static single assignment language accommodating complex symbolic memory references - Patent ...
		The invention, in one embodiment is a method of creating a rank-n static single assignment intermediate language from a rank-(n-1) static single assignment intermediate language, where n is a positive integer.
		The method includes searching the rank-(n-1) static single assignment intermediate language for a rank-1 definition that reaches at least one use; and renaming the rank-1 definition and the at least one use to a compiler temporary.
		The method of claim 7 wherein the act of searching to the rank-n static single assignment intermediate language for a rank definition of a higher rank that reaches at least one use includes searching a less than rank-n static single assignment intermediate language for a rank-n definition that reaches a use.
	www.freepatentsonline.com /5999735.html (6256 words)

	Department Computer Science - Informatics (CW)
		The idea of single assignment is to discard all the limitations because of the reuse of memory locations.
		Static single assignment does this in a textual way, but this is not enough for global optimizations like loop transformations.
		Although methods exist to transform a program to dynamic single assignment, they are either limited in applicability or they are computationally too expensive when aplied to larger, real-life programs.
	www.cs.kuleuven.ac.be /publicaties/rapporten/cw/CW360.abs.html (297 words)

	IBM Research \| Technical Paper Search \| Translating Out of Predicated Static Single Assignment Form(Search Reports)
		Static Single Assignment (SSA) form is an intermediate representation that allows a compiler to perform advanced optimizations to extract parallelism.
		If a compiler uses a predicated SSA form that is a combination of an SSA form and predication as an intermediate representation, it can perform advance optimizations that are otherwise difficult to apply in order to aggressively extract a parallelism from a program.
		Since the code in SSA form cannot be executed directly on the existing target architecture, a translation out of the predicated SSA form must be performed, and this translation is not trivial.
	domino.research.ibm.com /library/cyberdig.nsf/papers/6742B6070931B884852573A3000C714F (249 words)

	COM 3356 Lecture Notes 6
		If B is an ordinary block (not a loop header or pre-header), then move any movable assignments of rank R from successors into B, and identify any computations of rank R that may be movable from B into predecessors.
		Assignments are moved into a loop header exactly as for an ordinary basic block, but the identification of candidates for movement into the pre-header is complicated by the need to ensure that the computation is available along the back edge.
		Converting from SSA form back into a conventional control flow graph is a matter of dropping subscripts and converting phi nodes into assignments on exit from a predecessor block.
	www.ccs.neu.edu /home/will/com3356/notes6.html (1678 words)

	[No title]
		As an example of program transformation using Array SSA form, we show that its element-level "phi" functions enable a larger set of loops to be parallelized than in past work.
		Array SSA form provides for renaming of array variables and uses a phi function that identifies the defining assignment for each array element.
		The parallelization techniques based on Array SSA form exploit the possibility of computing phi functions at runtime in addition to analyzing array indices at compile time, and can thus uncover more general forms of loop-level and region-level parallelism than past techniques.
	www.cs.ucsb.edu /~ckrintz/papers/vivek_arrayssa.txt (430 words)

	Simple Generation of Static Single-Assignment Form - Aycock, Horspool (ResearchIndex)
		Abstract: The static single-assignment (SSA) form of a program provides dataflow information in a form which makes some compiler optimizations easy to perform.
		In this paper we present a new, simple method for converting to SSA form, which produces correct solutions for nonreducible controlflow graphs, and produces minimal solutions for reducible ones.
		Static Single Information from a Functional Perspective - Singer
	citeseer.ist.psu.edu /511338.html (616 words)

	redhat.com \| Red Hat Magazine - From Source to Binary: The Inner Workings of GCC
		The framework is based on a compiler formalism called Static Single Assignment (SSA), which is a representation used internally by the compiler to keep track of how data flows through the program.
		The Static Single Assignment form is a representation that is laid on top of GIMPLE that exposes very explicitly the flow of data within the program.
		Since the program is in SSA form and all the variables have version numbers, the compiler can simply build arrays indexed by version number to keep track of constant values.
	www.redhat.com /magazine/002dec04/features/gcc (3123 words)

	Trace-Driven, Just-In-Time Compilation with a New Application of Static Single Assignment Form 2006-460,Logikbase.com, ...
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		A single dose of ubiquitin obviously suppressed the clinical symptoms of a harmful immune response (edema, erythema, capillary leak, pulmonary failure).
		In the presence of a catalyst the phenolics react to form quinones that bond covalently to the microbes.
	logikbase.com /website/techprofile.cfm?licid=880 (10896 words)

	Static Single-Assignment Form
		An improvement on the idea of def-use chains is static single-assignment form, or SSA form, an intermediate representation in which each variable has only one definition in the program text.
		The one (static) definition-site may be in a loop that is executed many (dynamic) times, thus the name static single-assignment form.
		An example of the use of SSA form is shown in figure 1.
	flex-compiler.csail.mit.edu /Harpoon/quads/node3.html (458 words)

	Apparatus and method to incrementally update single static assignment (SSA) form - US Patent 6064820
		The incremental SSA tool generates a non-ambiguous new name, in SSA form, for each original name defined in a loop and used outside of the loop after loop unrolling, by using the existing CFG structure for the software code that is created by the compiler.
		Knobe et al., "Array SSA form and its use in parallelization", POPL '98, ACM, 1998, pp.
		McConnell et al., "Using Static single assignmenet form in a code optimizer", ACM 1992, pp.
	www.patentstorm.us /patents/6064820.html (586 words)

	Scale Compiler SSA (Site not responding. Last check: )
		Scale transforms the Scribble CFG into a static single assignment representation.
		When a variable is in static single assignment form it has only one definition.
		(The original global variable is not in SSA form.) Special care is required around subroutine calls and at the program exit to insure the validity of the value in the global variable.
	www-ali.cs.umass.edu /Scale/ssa.html (172 words)

	Abstract for ``Incremental Computation of Static Single Assignment Form''
		Static single assignment (SSA) form is an intermediate representation that is well suited for solving many data flow optimization problems.
		However, since the stadard algorithm for building SSA form is exhaustive, maintaining correct SSA form throughout a multi-pass compilation process can be prohibitively expensive.
		First, we specify incremental SSA algorithms for insertion and deletion of a use/definition of a variable, adn for a large class of updates on intervals.
	www.research.ibm.com /people/v/vsarkar/abstracts/ChSS96.html (182 words)

	Scale Compiler SSA
		Most optimizations are performed on a static single assignment representation of the Scribble CFG.
		The compiler is able to transform a CFG into and out of SSA form as required.
		When a variable is in static single assignment form it has only one definition.
	osl-www.cs.umass.edu /Scale/ssa.html (179 words)

	System and method for solving monotone information propagation problems - US Patent 5327561
		This allows problems from the large, general class of monotone data flow problems to enjoy the advantages of solutions based on Static Single Assignment (SSA) form.
		The optimizer includes a sparse evaluation graph generator which generates a sparse evaluation graph and an evaluator connected to evaluate the sparse evaluation graph in relation to the data flow framework.
		Cytron et al., Efficiently Computing Static Single Assignment Form and the Control Dependence Graph, ACM Tansactions on Programming Languages and Systems, vol.
	www.patentstorm.us /patents/5327561.html (323 words)

	CD and SSA Project Report
		In conversion to SSA form, dummy assignments called Phi-functions are introduced into the program in such a way that every use of a variable is reached by at most one real or dummy assignment.
		The reason is that all chariot routes are of the form [b, root).
		The reason is that all chariot routes are of the form [b, root), as for the stair-like CFG,so there is a single zone for Alpha>=1.
	www.cs.cornell.edu /home/ldzhou/CD/report.html (2653 words)

	Optimal register sharing for high-level synthesis of SSA form programs
		Register sharing for high-level synthesis of programs represented in static single assignment (SSA) form is proven to have a polynomial-time solution.
		Although graph coloring is NIP-Complete in the general case, an interference graph constructed for a program in SSA form probably belongs to the class of chordal graphs that have an optimal O(V + E) time algorithm.
		Chordal graph coloring reduces the number of registers allocated to the program by as much as 86% and 64.93% on average compared to linear scan register allocation.
	repositories.cdlib.org /postprints/1981 (219 words)

	Weak Dynamic Single Assignment Form
		For example, classical static single assignment (SSA) form is very successful in serial compilers for both these reasons.
		However, SSA form is not very helpful for the analysis of loop and array based codes for parallel targets.
		We present a new Dynamic Single Assignment (DSA) form, designed specifically for analysis and transformations of array and loop-based codes.
	www.hpl.hp.com /techreports/2003/HPL-2003-169R1.html (135 words)

	[No title]
		Section 2 discusses the generation of the Dominator Tree and the implementation of the Depth First Search algorithm, the implementation of the Live variable analysis algorithm and the Static Single Assignment form, Section 3 presents the implementation details of the Global Value Numbering algorithm.
		The (-function inserted during the SSA form generation of the program do not have an commonly implemented instruction in hardware.
		It creates a data structure, in which, for each partition, there is a DAG with a single “root” vertex.
	www.cacs.louisiana.edu /~sxm5554/551/report.doc (1622 words)

	COCV'03 Preliminary Version A Functional Perspective on SSA Optimisation Algorithms - CiteSeerX
		The static single assignment (SSA) form is central to a range of optimisation algorithms relying on data ow information, and hence, to the correctness of compilers employing those algorithms.
		It is well known that the SSA form is closely related to lambda terms (i.e., functional programs), and, considering the large amount of energy expended on theories and frameworks for formal reasoning in the lambda calculus, it seems only natural to leverage this connection to improve our capabilities to reason about compiler optimisations.
		In this paper, we discuss a new formalisation of the mapping from SSA programs to a restricted form of lambda terms, called administrative normal form (ANF).
	citeseerx.ist.psu.edu /viewdoc/summary?doi=10.1.1.14.6418 (530 words)

	Static Single Assignment (SSA) form in an Embedded Compiler \| HiPEAC
		Static Single Assignment (SSA) form in an Embedded Compiler
		Static Single Assignment (SSA) form in an Embedded Compiler
		For use by embedded systems, STMicroelectronics in Manno is currently developing a Just-In-Time (JIT) compiler that translates the.NET byte-code of Microsoft, also known as MSIL or CIL (Common Intermediate Language), into native code.
	www.hipeac.net /node/576 (179 words)

	1 Single-Pass Generation of Static Single Assignment Form for Structured Languages - CiteSeerX
		Algorithms are known that generate SSA form from programs with an arbitrary flow of control.
		We show that it is possible to generate SSA form in a single pass (even during parsing) if the program contains only structured control flow (i.e., no gotos).
		600 Efficiently computing static single assignment form and the control dependence graph – Cytron, Ferrante, et al.
	citeseerx.ist.psu.edu /viewdoc/summary?doi=10.1.1.45.4503 (317 words)

	SSA for Trees - GNU Project - Free Software Foundation (FSF)
		This means that we would have to duplicate all this code for each front end.
		generates a single tree for the whole assignment statement.
		Rewriting the tree into SSA form is finished.
	gcc.gnu.org /projects/tree-ssa (1717 words)

	Eliminating Range Checks using Static Single Assignment Form
		We propose a new method of eliminating range checks in connection with array index expressions and assignments to variables of subrange types.
		Contrary to the approaches documented in the literature, we work on an extended static single assignment form (XSA) very near the target level.
		Introduction Implementation of safe programming languages requires range checks in connection with array index expressions and, where applicable, with assignments to variables of subrange types.
	nsdl.org /resource/2200/20061121100803509T (512 words)

	SSA Static Single Assignment Form
		As most modern designs, Firm employs static single assignment form (SSA) to represent scalar data flow.
		If a Firm operator is semantically required to execute in a node of the CFG, it is control dependent on that node.
		This integrates data flow and control flow into a single dependence graph.
	www.hei.biz /firm/ssa.html (249 words)

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