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In computer programming, transient is a property of any element in the system that is temporary. The term applies to transient applications, i.e. software for the end-user which is displayed with a transient application posture; transient data, which is discarded after it is no longer needed by the computation; and transient code which are subroutines or software components that are loaded in ...
PDGs are used in optimization, debugging, and understanding program behavior. One example of this is their utilization by compilers during dependence analysis, enabling the optimizing compiler to make transformations to allow for parallelism. [1] [2]
In computer science, a control-flow graph (CFG) is a representation, using graph notation, of all paths that might be traversed through a program during its execution. The control-flow graph was conceived by Frances E. Allen, [1] who noted that Reese T. Prosser used boolean connectivity matrices for flow analysis before. [2]
Alias analysis is a technique in compiler theory, used to determine if a storage location may be accessed in more than one way. Two pointers are said to be aliased if they point to the same location. Alias analysis techniques are usually classified by flow-sensitivity and context-sensitivity. They may determine may-alias or must-alias information.
The COINS compiler uses SSA form optimizations as explained here. Reservoir Labs' R-Stream compiler supports non-SSA (quad list), SSA and SSI (Static Single Information [36]) forms. [37] Although not a compiler, the Boomerang decompiler uses SSA form in its internal representation. SSA is used to simplify expression propagation, identifying ...
To combat this, a just-in-time (JIT) compiler was introduced into Java 1.1. Due to the high cost of compiling, an added system called HotSpot was introduced in Java 1.2 and was made the default in Java 1.3. Using this framework, the Java virtual machine continually analyses program performance for hot spots which are executed frequently or ...
Predication is most effective when paths are balanced or when the longest path is the most frequently executed, [3] but determining such a path is very difficult at compile time, even in the presence of profiling information.
Whole program optimization (WPO) is the compiler optimization of a program using information about all the modules in the program. Normally, optimizations are performed on a per module, "compiland", basis; but this approach, while easier to write and test and less demanding of resources during the compilation itself, does not allow certainty about the safety of a number of optimizations such ...