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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
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
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)
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
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
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
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
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
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
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
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
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
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
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
SafeTSA (Safe Typed Single Assignment) is a static single assignment form (SSA) intermediate representation capable of representing all of the type safety
SafeTSA
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
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
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
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
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
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
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
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
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
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
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
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)
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
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)
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
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
standard target for Prolog compilers Mark Wegman, co-invented static single-assignment form, won ACM SIGPLAN 2006 PL Achievement Award Peter Wegner, seminal
List of programming language researchers
List_of_programming_language_researchers
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
General-purpose programming language
logical operators including +, +=, ++, &, ||, and multiple assignments may be performed in a single statement. A variable declared inside a block is accessible
C_(programming_language)
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
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
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
SISAL (Streams and Iteration in a Single Assignment Language) is a general-purpose single assignment functional programming language with strict semantics
SISAL
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
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)
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
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)
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++)
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)
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
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)
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
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
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
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
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
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)
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
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
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
Approach to restricting system access to authorized users
including ensuring that "assignment of privileges is based on individual personnel's job classification and function" (Requirement 7), a form of role-based access
Role-based_access_control
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
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
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)
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
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
Comparison of C and C++ 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++
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
Instructions a computer can execute
Keywords are reserved words to form declarations and statements. Symbols are characters to form operations, assignments, control flow, and delimiters.
Computer_program
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
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
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
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)
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)
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
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
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
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
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
Container for a set of identifiers
class ExampleKt { private static double myPi = Math.PI; public static final double getMyPi() { return myPi; } public static final void setMyPi(double
Namespace
1995 edition of the Fortran programming language standard
or to a static object that has the TARGET attribute: REAL, POINTER :: object REAL, TARGET :: target_obj var => object ! pointer assignment var => target_obj
Fortran_95_language_features
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)
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
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
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
Software engineering object-oriented API
Program { static void Main(string[] args) { // Object creation Customer c1 = new(); // Using the method chaining to assign & print data with a single line
Fluent_interface
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
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
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
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
Organized collection of data in computing
individual basis, or by the assignment of individuals and privileges to groups, or (in the most elaborate models) through the assignment of individuals and groups
Database
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
Parallelization across multiple processors in parallel computing environments
on each element in parallel. It contrasts to task parallelism as another form of parallelism. A data parallel job on an array of n elements can be divided
Data_parallelism
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
STATIC SINGLE-ASSIGNMENT-FORM
STATIC SINGLE-ASSIGNMENT-FORM
Surname or Lastname
English
English : unexplained.
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.
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.
Female
English
Short form of English Eustacia, STACIA means "fruitful."
Surname or Lastname
English
English : variant of Ingle.
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 (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).
Male
Greek
Short form of Greek Eustathios, STATHIS means "good stability."
Boy/Male
Slavic
Stand of glory.
Boy/Male
Arabic, Muslim
State of Being Single; Ecstasy
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.
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
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 : 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 : 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’.
Male
Norwegian
Norwegian form of Old Norse Sindri, possibly SINDRE means "sparkling."
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 : 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 : 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.
Female
English
Feminine variant spelling of English unisex Stacey, STACIE means "resurrection."
STATIC SINGLE-ASSIGNMENT-FORM
STATIC SINGLE-ASSIGNMENT-FORM
Female
Welsh
Welsh name RHOSYN means "rose."
Girl/Female
Gujarati, Hindu, Indian, Jain, Kannada, Malayalam, Marathi
Prayer Ceremony; God Worship; Meaningful; Devotion; Hymns Sang in Praise of God
Girl/Female
Indian
Secured, Safe
Boy/Male
Hindu
Large eyed
Girl/Female
Indian
A Flower
Girl/Female
Arabic, Australian, Hebrew
Tender Affection
Girl/Female
Gujarati, Indian
Creator; Another Name for Brahma
Surname or Lastname
English
English : variant of Meggett.
Male
English
Anglicized form of Latin Premislaus, PREMISLAS means "cunning."
Girl/Female
Tamil
Great
STATIC SINGLE-ASSIGNMENT-FORM
STATIC SINGLE-ASSIGNMENT-FORM
STATIC SINGLE-ASSIGNMENT-FORM
STATIC SINGLE-ASSIGNMENT-FORM
STATIC SINGLE-ASSIGNMENT-FORM
adv.
Without partners, companions, or associates; single-handed; as, to attack another singly.
a.
Not doubled, twisted together, or combined with others; as, a single thread; a single strand of a rope.
n. pl.
See Single, n., 2.
v. t.
To cover with shingles; as, to shingle a roof.
v. i.
To dangle; to wave hanging.
imp. & p. p.
of Jingle
n.
See Lingel.
a.
Simple; not wise; weak; silly.
v. i.
To take the irrregular gait called single-foot;- said of a horse. See Single-foot.
a.
Performed by one person, or one on each side; as, a single combat.
n.
An unlined or undyed waistcoat; a single garment; -- opposed to doublet.
imp. & p. p.
of Mingle
n.
An irregular gait of a horse; -- called also single-footed pace. See Single, v. i.
a.
Having a single purpose; hence, artless; guileless; single-hearted.
a.
Hence, unmarried; as, a single man or woman.
a.
One only, as distinguished from more than one; consisting of one alone; individual; separate; as, a single star.
n.
See Alignment.
imp. & p. p.
of Single
n.
A unit; one; as, to score a single.
n. & v.
See Jingle.