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In compiler design, static single assignment form (often abbreviated as SSA form or simply SSA) is a type of intermediate representation (IR) where each variable is assigned exactly once. SSA is used in most high-quality optimizing compilers for imperative languages, including LLVM , the GNU Compiler Collection , and many commercial compilers.
In computer programming, an assignment statement sets and/or re-sets the value stored in the storage location(s) denoted by a variable name; in other words, it copies a value into the variable. In most imperative programming languages , the assignment statement (or expression) is a fundamental construct.
The name derives from the use of three operands in these statements even though instructions with fewer operands may occur. Since three-address code is used as an intermediate language within compilers, the operands will most likely not be concrete memory addresses or processor registers , but rather symbolic addresses that will be translated ...
The DAG specifies a data dependency among assignment statements, as well as a partial order (therefore parallelism among statements). When statement is reached, there is a list of live variable assignments. If only one assignment is live, for example, constant propagation might be used.
The assignment statement assigns values to one or more variables. ... Like PL/I F, it is a multiple pass compiler with a 44 kilobyte design point, but it is an ...
The design of an AST is often closely linked with the design of a compiler and its expected features. Core requirements include the following: Variable types must be preserved, as well as the location of each declaration in source code. The order of executable statements must be explicitly represented and well defined.
Compiler design. Regardless of the exact number of phases in the compiler design, the phases can be assigned to one of three stages. The stages include a front end, a middle end, and a back end. The front end scans the input and verifies syntax and semantics according to a specific source language.
In compiler optimization, register allocation is the process of assigning local automatic variables and expression results to a limited number of processor registers. Register allocation can happen over a basic block ( local register allocation ), over a whole function/ procedure ( global register allocation ), or across function boundaries ...