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Property of an intermediate representation in a compiler
In compiler design, static single assignment form (often abbreviated as SSA form or simply SSA) is a type of intermediate representation (IR) where each
Static_single-assignment_form
Setting or re-setting the value associated with a variable name
including assignment. Assignment operator (C++) Static single-assignment form Unification (computer science) Immutable object Assignment problem Use
Assignment_(computer_science)
Programming style in which control is passed explicitly
an imperative or procedural programming language would use static single assignment form (SSA). SSA is formally equivalent to a subset of CPS (excluding
Continuation-passing_style
When every path in a control-flow graph must go through one node to reach another
used in static single assignment form. Dominators, and dominance frontiers particularly, have applications in compilers for computing static single assignment
Dominator_(graph_theory)
Topics referred to by the same term
Selected Area, a control character in the C1 control code set Static single-assignment form, a property of intermediate representations used in compilers
SSA
compilers after conversion to static single assignment form (SSA). It propagates constants, which is the calculation of static values which can be calculated
Sparse conditional constant propagation
Sparse_conditional_constant_propagation
Intermediate code used by optimizing compilers
portal Intermediate language Reduced instruction set computer Static single-assignment form (SSA) V., Aho, Alfred (1986). Compilers, principles, techniques
Three-address_code
Intermediate representation in a functional compiler
for optimisations in compilers. Continuation-passing style Static single assignment form Sabry, Amr; Felleisen, Matthias. "Reasoning about Programs in
A-normal_form
equivalent expressions, but recently formulations of PRE based on static single assignment form have been published that apply the PRE algorithm to values instead
Partial-redundancy elimination
Partial-redundancy_elimination
Computer compiler optimization technique
the compiler is using an intermediate representation such as static single-assignment form (SSA). In particular, when SSA is not fully optimized it can
Register_allocation
Compiler backend for multiple programming languages
language-independent instruction set and type system. Each instruction is in static single assignment form (SSA), meaning that each variable (called a typed register)
LLVM
Topics referred to by the same term
Xeon Phi, an Intel MIC microprocessor Φ (Phi) function, in static single-assignment form compiler design Codename for the Nokia Lumia 920 Phi (language
Phi_(disambiguation)
Just-in-time compiler for the Lua programming language
inlined to form a linear trace. All executed bytecode instructions are stored and incrementally converted into LuaJIT's static single-assignment intermediate
LuaJIT
Low-level parallel thread execution virtual machine and instruction set architecture
pure static single-assignment form, with consecutive lines generally referring to consecutive registers. Programs start with declarations of the form .reg
Parallel_Thread_Execution
Programming tool for profiling, memory debugging and memory leak detection
temporary, simpler form called intermediate representation (IR), which is a processor-neutral, static single assignment form-based form. After the conversion
Valgrind
SafeTSA (Safe Typed Single Assignment) is a static single assignment form (SSA) intermediate representation capable of representing all of the type safety
SafeTSA
Concept in computer science
Dead-code elimination Loop-invariant code motion Reachable uses Static single assignment form Aho, Alfred V.; Sethi, Ravi & Ullman, Jeffrey D. (1986). Compilers:
Reaching_definition
Free and open-source library for 3D graphics rendering
compiling and optimizing. See Abstract syntax tree (AST) and Static single assignment form (SSA form). SPIR-V is a certain version of the Standard Portable
Mesa_(computer_graphics)
Binary arithmetic algorithm
allocation. This is particularly important for compilers using static single assignment form for register allocation; these compilers occasionally produce
XOR_swap_algorithm
Compiler optimization to remove code which does not affect the program results
analysis. An algorithm based on static single-assignment form (SSA) appears in the original journal article on SSA form by Ron Cytron et al. Robert Shillingsburg
Dead-code_elimination
Data structure that tracks variable use and definitions
the context or scope. (In static single assignment form, use-define chains are explicit because each chain contains a single element.) For a variable,
Use-define_chain
American computer scientist
Wegman is best known for being one of the inventors of the Static-single assignment form, which is used in the analysis portion of most if not all modern
Mark_N._Wegman
Compiler that optimizes generated code
be done after transforming the program into a special form called static single-assignment form, in which every variable is assigned in only one place
Optimizing_compiler
Software engineering technique
value numbering (GVN) is a compiler optimization based on the static single-assignment form (SSA) intermediate representation. It sometimes helps eliminate
Value_numbering
C++ framework for compiler development
results, attributes, and regions. Operands and results follow the static single-assignment form (SSA), and each result is associated with a type. Attributes
MLIR_(software)
Open-source implementation of .NET Framework
based on three-address code, in which variables are kept in static single assignment form. libJIT has also seen some use in other open source projects
DotGNU
Method of analyzing variables in software
only grow in further iterations. Several modern compilers use static single-assignment form as the method for analysis of variable dependencies. In 2002
Data-flow_analysis
JavaScript and WebAssembly engine
translated SpiderMonkey bytecode into a control-flow graph, using static single assignment form (SSA) for the intermediate representation. This architecture
SpiderMonkey
Technique used to optimize the execution of a program at runtime
instructions, which are traced and then compiled to machine code using static single-assignment form (SSA) construction. The motivation for HotpathVM was to have
Tracing just-in-time compilation
Tracing_just-in-time_compilation
Compiler optimization
technique for bounds-checking elimination is to use a typed static single assignment form representation and for each array to create a new type representing
Bounds-checking_elimination
Mark N.; Zadeck, F. Kenneth (1991). "Efficiently Computing Static Single Assignment Form and the Control Dependence Graph" (PDF). ACM Transactions on
History of compiler construction
History_of_compiler_construction
data model — SCAMPI — Stack (abstract data type) — Static code analysis — Static single-assignment form — Statistical package — String — Structured programming
Index of software engineering articles
Index_of_software_engineering_articles
Austrian computer scientist
following topics. First, dynamic compilation, with areas like static single assignment form, feedback directed optimisation, dynamic redefinition of programs
Hanspeter_Mössenböck
stack1 // istore 1 In general the resulting code does not have static single assignment form. Soot is now succeeded by the SootUp framework developed by
Soot_(software)
Zadeck, F. K. (1989-01-01). "An efficient method of computing static single assignment form". Proceedings of the 16th ACM SIGPLAN-SIGACT symposium on Principles
Control_dependency
American computer scientist
collaborated with various researchers at IBM to develop the Static Single Assignment form (SSA). The SSA is a data structure that allows for more efficient
Jeanne_Ferrante
standard target for Prolog compilers Mark Wegman, co-invented the static single-assignment form, the ACM SIGPLAN 2006 PL Achievement Award Peter Wegner, seminal
List of programming language researchers
List_of_programming_language_researchers
Polynomial-time algorithm for the assignment problem
Hungarian method is a combinatorial optimization algorithm that solves the assignment problem in polynomial time and which anticipated later primal–dual methods
Hungarian_algorithm
Computer science concept
features. Most type-safe languages include some form of dynamic type checking, even if they also have a static type checker. The reason for this is that many
Type_system
General-purpose programming language
and logic operators, including +,+=,++,&,|| Multiple assignments may be performed in a single statement User-defined identifiers are not distinguished
C_(programming_language)
Rules defining correctly structured Java programs
import") imports all the types of the package. A "static import" imports members of the package. /** * This form of importing classes makes all classes * in
Java_syntax
It simultaneously does definite assignment analysis and constant propagation of boolean values. We define five static functions: We supply data-flow equations
Definite_assignment_analysis
Open-source Java obfuscation tool
control flow analysis, data-flow analysis, partial evaluation, static single assignment, global value numbering, and liveness analysis. ProGuard can remove
ProGuard
Part of a computer program where a given name binding is valid
the block. This complicates the use of conditional statements with single assignment. For example, in Python, which does not use block scope, one may initialize
Scope_(computer_programming)
Set of rules defining correctly structured programs for the C# programming language
method. public static Foo operator+(Foo foo, Bar bar) { return new Foo(foo.Value + bar.Value); } These are the overloadable operators: Assignment operators
C_Sharp_syntax
Form of text that defines C code
goto if inline int long register restrict return short signed sizeof static static_assert struct switch thread_local typedef typeof typeof_unqual union
C_syntax
Procedural, imperative computer programming language
to single values, together with user-defined procedures which, likewise, may operate on and return aggregate as well as single values. The assignment statement
PL/I
SISAL (Streams and Iteration in a Single Assignment Language) is a general-purpose single assignment functional programming language with strict semantics
SISAL
antenna combining Transmitter macro diversity such as OFDM single frequency networks (SFN) Static RRM schemes are used in many traditional wireless systems
Radio_resource_management
C++ programming keywords for dynamic memory allocation
import std; class Singleton { private: static void* instance = nullptr; static size_t refcount = 0; public: static void* operator new(size_t size) { if
New_and_delete_(C++)
Statement that a predicate is always true at that point in code execution
one step, but the malloc call and the assignment to ptr is a side effect of evaluating the expression that forms the assert condition. When the NDEBUG
Assertion (software development)
Assertion_(software_development)
Special function called to create an object
expressions MyClass c = new(42, "string"); In C#, a static constructor is a static data initializer. Static constructors are also called class constructors
Constructor (object-oriented programming)
Constructor_(object-oriented_programming)
Java archive file format
a static libraries "File Extension .JAR Details". Retrieved 29 November 2012. "MIME : Java Glossary". Retrieved 29 November 2012. "IANA Assignment". Retrieved
JAR_(file_format)
Computer science concept
probabilities). Optimal BSTs are generally divided into two types: static and dynamic. In the static optimality problem, the tree cannot be modified after it has
Optimal_binary_search_tree
Graphical representation of a computer program or algorithm
such as LLVM use a CFG in which basic blocks consist of abstract static single-assignment instructions as their primary IR. Here is the above function translated
Control-flow_graph
Divisioning of a logical database
example, is a method of vertical partitioning. A common form of vertical partitioning is to split static data from dynamic data, since the former is faster
Partition_(database)
Network communications domain that is isolated at the data link layer
be established either statically or dynamically. Static VLANs are also referred to as port-based VLANs. Static VLAN assignments are created by assigning
VLAN
Type qualifier denoting the data as being read-only
compile-time parameters. A const automatic variable (non-static local variable) means that single assignment is happening, though a different value may be used
Const_(computer_programming)
Computer programming language
VALUE, i.e. the right side of an assignment (rvalue) or may be used to resolve the left side (lvalue) of an assignment, i.e. private, or public variables
Harbour (programming language)
Harbour_(programming_language)
When a system's behavior depends on timing of uncontrollable events
groups: static analysis tools and dynamic analysis tools. Thread Safety Analysis is a static analysis tool for annotation-based intra-procedural static analysis
Race_condition
Field of machine learning
processing (NLP), where tasks are often sequential decision-making rather than static classification. Reinforcement learning is where an agent take actions in
Reinforcement_learning
Data structure for Boolean functions
from node u {\displaystyle u} to a low (or high) child represents an assignment of the value FALSE (or TRUE, respectively) to variable x i {\displaystyle
Binary_decision_diagram
Device that forwards data packets between computer networks
pre-configured directives, called static routes, or by learning routes dynamically using a routing protocol. Static and dynamic routes are stored in the
Router_(computing)
Language for controlling a computer
such as Java and C# have definite assignment analysis, a form of data flow analysis, as part of their respective static semantics. Once data has been specified
Programming_language
platforms and libraries. C# and Java are similar languages that are typed statically, strongly, and manifestly. Both are object-oriented, and designed with
Comparison of C Sharp and Java
Comparison_of_C_Sharp_and_Java
Comparison of programming languages
about pointer assignments that add qualifiers as it allows the assignment of int ** to const int *const * but not the unsafe assignment to const int **
Compatibility_of_C_and_C++
Scripting language created in 1994
list). Retrieved 2014-02-07. "Late Static Binding in PHP". Digital Sandwich. 2006-02-23. Retrieved 2008-03-25. "Static Keyword". The PHP Group. Retrieved
PHP
2011 edition of the C++ programming language standard
keyword static_assert. The declaration assumes this form: static_assert(constant-expression, error-message); Here are some examples of how static_assert
C++11
Basic programming language construct
Dereference: *p Comma: e, f Compound operators Compound assignment (aka augmented assignment) in C/C++: +=, -=, *=, /=, %=, <<=, >>=, &=, ^=, |= Fused:
Operator (computer programming)
Operator_(computer_programming)
Generic term for compiler optimization
done twice for the same result. LLVM has a sinking pass in its single static assignment form. LLVM 15.0 will not sink an operation if any of its code paths
Code_motion
Set of rules defining correctly structured programs
in instanceof interface let new package private protected public return static super switch this throw try typeof using var void while with yield The following
JavaScript_syntax
Directed graph with no directed cycles
function value for any truth assignment to the variables is the value at the sink found by following a path, starting from the single source vertex, that at
Directed_acyclic_graph
Direct current electric motor
conductor around a fixed axis so that the conductor is perpendicular to a static magnetic field. The resulting force being continuous in one direction, the
Homopolar_motor
Former railroad in the midwestern United States
mid-1950s. Currently on static display at the Illinois Railway Museum in Union, Illinois. 710 (K-4 4-6-0) – Currently on static display at Iron Horse Park
Chicago, Burlington and Quincy Railroad
Chicago,_Burlington_and_Quincy_Railroad
Versions of a JavaScript standard
type annotations and static typing, probably using a structural type system, generators and iterators, destructuring assignment, and algebraic data types
ECMAScript_version_history
Type of data structure
has no non-static data members of type non-POD-struct, non-POD-union (or array of such types) or reference, and has no user-defined assignment operator
C++_classes
Probabilistic theory of knowledge
principal principle belong to the static principles while the principle of conditionalization governs the dynamic aspects as a form of probabilistic inference
Bayesian_epistemology
that only contains abstract or default methods, constant (static final) fields and static interfaces. It can later be implemented by classes that declare
List_of_Java_keywords
Set of rules defining correctly structured C++ program
curiously recurring template pattern, it is possible to implement a form of static polymorphism that closely mimics the syntax for overriding virtual functions
C++_syntax
Assigning or adjusting addresses at runtime
collection Pointer swizzling, a lazy form of pointer modification Prebinding Rebasing Relocatable Object Module Format Static library "Types of Object Code"
Relocation_(computing)
Radio nodes organized in a mesh topology
static, so that routes computation can converge and delivery of data to their destinations can occur. Hence, this is a low-mobility centralized form of
Wireless_mesh_network
Object-oriented programming language
Assigner commands allow assignment-like syntax to call "setter" procedures. An assignment proper can never be of the form a.x := v as this violates
Eiffel_(programming_language)
General-purpose programming language
capabilities and keywords for typing were added to the language, allowing optional static typing. As of 2026[update], the Python Software Foundation supports Python
Python_(programming_language)
Comparison of two programming languages
"true" in C; this is in part because C (and ALGOL) allow multiple assignment in the form a = b = c = 10; which is not supported by Pascal. Also note that
Comparison_of_Pascal_and_C
Set of rules defining correctly structured programs
inherits from class Bar. The method myStaticMethod is a public static method that can be called with Foo::myStaticMethod();. class Foo extends Bar { function
PHP_syntax_and_semantics
Set of rules defining correctly structured programs
third party frameworks. For example, a library could be written to handle static typing: def haul(item: Haulable, *vargs: PackAnimal) -> Distance: # implementation
Python_syntax_and_semantics
User-definable variable associated with each running process in many operating systems
the first client. The numbers are assigned by the file server and remain static for as long as the IPX connection remains established. It resembles an identically
Environment_variable
Internal computer component that provides power to other components
result in a wrong pin assignment and thus can lead to damage of connected components by supplying 12V to a 5V or 3.3V pin. The Small Form Factor with a 12 V
Power_supply_unit_(computer)
Family of type systems based on substructural logic
assignment, thus ensuring that only one reference to any object exists at once. Note that passing a reference as an argument to a function is a form of
Substructural_type_system
Inherent flaw in computer instructions
than for an interpreted language. Languages may include features such as a static type system, restricted namespaces, and modular programming. For example
Software_bug
Wireless networking standard
is a spatial multiplexing technique. MU-MIMO allows the access point to form beams towards each client, while transmitting information simultaneously
Wi-Fi_6
Business planning and analysis technique
strategic analysis, but has also been criticized for limitations such as the static nature of the analysis, the influence of personal biases in identifying
SWOT_analysis
Technique to compress data
probability distribution. (However, for each minimizing codeword length assignment, there exists at least one Huffman code with those lengths.) The technique
Huffman_coding
Value that is not changed during execution
distinctions that are often overlooked. The most significant are: compile-time (statically valued) constants, run-time (dynamically valued) constants, immutable
Constant (computer programming)
Constant_(computer_programming)
Label to identify a network interface of a computer or other network node
need to match the MAC address, real or spoofed. The globally unique and static MAC addresses used by stateless address autoconfiguration to create interface
IPv6_address
Ability of computer instructions to be executed simultaneously with correct results
concurrency. In ILP, there is a single specific thread of execution of a process. On the other hand, concurrency involves the assignment of multiple threads to
Instruction-level_parallelism
Extraction of information from a running system to verify certain properties
programming language. Further, static analyses can reason about monitoring aspects more easily than about other forms of program instrumentation, as all
Runtime_verification
story. Only static computers are included. Robots and other fictional computers that are described as existing in a mobile or humanlike form are discussed
List_of_fictional_computers
Software engineering object-oriented API
static void Main(string[] args) { // Object creation Customer c1 = new Customer(); // Using the method chaining to assign & print data with a single line
Fluent_interface
Machine learning technique
discrete action, like in RL). The token-expert match may involve no learning ("static routing"): It can be done by a deterministic hash function or a random number
Mixture_of_experts
STATIC SINGLE-ASSIGNMENT-FORM
STATIC SINGLE-ASSIGNMENT-FORM
Boy/Male
Slavic
Stand of glory.
Female
English
Feminine variant spelling of English unisex Stacey, STACIE means "resurrection."
Surname or Lastname
English
English : from either of two Old Norse personal names: Ingjaldr, in which the prefix in- probably reinforces the element -gjaldr, related to Old Norse gjalda ‘to pay or recompense’, or Ingólfr ‘Ing’s wolf’ (Ing was an ancient Germanic fertility god).English : habitational name from Ingol in Lancashire, which is named from the Old English personal name Inga + holh ‘hollow’, ‘depression’.Probably a variant of German Ingel, from a short form of any of several Germanic personal names formed with Ing- (see 1 above).An early bearer, Richard Ingle (1609–c. 1653), was a rebel and a pirate who first came to the colonies in 1631 or 1632 as a tobacco merchant. He is known to have practiced piracy in MD.
Surname or Lastname
English (West Midlands)
English (West Midlands) : occupational name for a worker in the linen or hemp industry, from an agent derivative of Middle English swingle ‘swingle’ (see Swingle).
Surname or Lastname
English
English : variant of Ingle.
Surname or Lastname
English
English : occupational name from an agent derivative of Middle English tingle (see Tingle).German : occupational or status name for a medieval judge or court official, from Old High German ding ‘legal proceeding’.German : variant of Tengler.
Male
Greek
Short form of Greek Eustathios, STATHIS means "good stability."
Male
Norwegian
Norwegian form of Old Norse Sindri, possibly SINDRE means "sparkling."
Surname or Lastname
English
English : topographic name for someone who lived in a place cleared of woods by fire, from Middle English sengle ‘burnt clearing’.German : from a pet form of a short form of a Germanic person name formed with sing ‘sing’ as the first element.
Boy/Male
Arabic, Muslim
State of Being Single; Ecstasy
Surname or Lastname
English
English : habitational name from a place in Northamptonshire named Dingley, possibly from Middle English dingle ‘hollow’ + Old English lēah ‘woodland clearing’.
Surname or Lastname
English
English : metonymic occupational name for a worker in the linen or hemp industry, from Middle English swingle ‘swingle’, a wooden implement used for beating flax or hemp (Middle Dutch swinghel, from the verb ‘to swing’).Possibly an Americanized spelling of German Zwingel, a topographic name from Middle High German zwingel ‘citadel’.
Surname or Lastname
English
English : from Middle English sengler, syngler ‘singular’ (Old French se(i)ngler), perhaps a nickname for a solitary person.German : topographic name for a valley dweller, from a diminutive of Middle High German senke ‘valley’ + the suffix -er, denoting an inhabitant.German : habitational name for someone from Singeln near Waldshut.German : variant of Sing 1.
Surname or Lastname
English
English : metonymic occupational name for a maker of nails or pins, or nickname for a small, thin man, from Middle English tingle, a kind of very small nail (of North German origin).
Surname or Lastname
English
English : unexplained.
Female
English
Short form of English Eustacia, STACIA means "fruitful."
Surname or Lastname
English
English : occupational name for someone who laid wooden tiles (shingles) on roofs, from an agent derivative of Middle English schingle ‘shingle’.
Surname or Lastname
English
English : topographic name for someone living in a small wooded dell or hollow, Middle English dingle (of uncertain origin). There is a district of Liverpool called Dingle.South German : nickname or status name for a smallholder, from Middle High German dingelīn ‘smallholding’.Americanized spelling of the old Prussian name Dingel or Dyngele, possibly from Germanic thing ‘legal assembly’.
Surname or Lastname
English
English : from the Old English personal name Hringwulf.German : from a short form of a Germanic personal name based on hring ‘ring’.German : metonymic occupational name for a ring maker (see Ringler).German : altered spelling of Ringel, an Old Prussian personal name.
Surname or Lastname
English
English : perhaps a metonymic occupational name for a spindle maker, from Middle English spindle, spindel (Old English spinel).Americanized spelling of German and Jewish Spindel.
STATIC SINGLE-ASSIGNMENT-FORM
STATIC SINGLE-ASSIGNMENT-FORM
Girl/Female
Australian, Danish, Dutch, German, Latin
Blessed; Form of Benedict
Boy/Male
Hindu, Indian, Tamil
King Name
Girl/Female
Danish, Dutch, German, Swedish
Frenchman; Free Woman
Girl/Female
Indian, Telugu
End of the Snow
Boy/Male
Arabic
Genuine; Original; Relating to the Eyes
Girl/Female
Hindu, Indian, Punjabi, Sikh
Messenger of God; Kind; Remembering God
Boy/Male
Hindu
Boy/Male
American, Anglo, Australian, British, Christian, English, Jamaican
From the High Meadow
Boy/Male
Muslim
Intimate friend of Allah
Surname or Lastname
English
English : variant of Siddall.
STATIC SINGLE-ASSIGNMENT-FORM
STATIC SINGLE-ASSIGNMENT-FORM
STATIC SINGLE-ASSIGNMENT-FORM
STATIC SINGLE-ASSIGNMENT-FORM
STATIC SINGLE-ASSIGNMENT-FORM
a.
Hence, unmarried; as, a single man or woman.
adv.
Without partners, companions, or associates; single-handed; as, to attack another singly.
n. pl.
See Single, n., 2.
imp. & p. p.
of Mingle
a.
Performed by one person, or one on each side; as, a single combat.
a.
Having a single purpose; hence, artless; guileless; single-hearted.
imp. & p. p.
of Jingle
n.
An irregular gait of a horse; -- called also single-footed pace. See Single, v. i.
v. i.
To dangle; to wave hanging.
n.
An unlined or undyed waistcoat; a single garment; -- opposed to doublet.
v. i.
To take the irrregular gait called single-foot;- said of a horse. See Single-foot.
n. & v.
See Jingle.
a.
Simple; not wise; weak; silly.
a.
Not doubled, twisted together, or combined with others; as, a single thread; a single strand of a rope.
imp. & p. p.
of Single
v. t.
To cover with shingles; as, to shingle a roof.
n.
A unit; one; as, to score a single.
a.
One only, as distinguished from more than one; consisting of one alone; individual; separate; as, a single star.
n.
See Lingel.
n.
See Alignment.