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The IBM System/360 Model 91 was an early machine that supported out-of-order execution of instructions; it used the Tomasulo algorithm, which uses register renaming. The POWER1 from 1990 is the first microprocessor that used register renaming and out-of-order execution. This processor implemented register renaming only for floating-point loads.
Tomasulo's algorithm uses register renaming to correctly perform out-of-order execution. All general-purpose and reservation station registers hold either a real value or a placeholder value. If a real value is unavailable to a destination register during the issue stage, a placeholder value is initially used.
While process advances will allow ever greater numbers of execution units (e.g. ALUs), the burden of checking instruction dependencies grows rapidly, as does the complexity of register renaming circuitry to mitigate some dependencies. Collectively the power consumption, complexity and gate delay costs limit the achievable superscalar speedup.
Alpha-renaming can make static code analysis easier since only the alpha renamer needs to understand the language's scoping rules. For example, in this code: class Point { private : double x , y ; public : Point ( double x , double y ) { // x and y declared here mask the privates setX ( x ); setY ( y ); } void setX ( double newx ) { x = newx ...
A register file is an array of processor registers in a central processing unit (CPU). The instruction set architecture of a CPU will almost always define a set of registers which are used to stage data between memory and the functional units on the chip.
Renaming may refer to: Place names ... Computing. Batch renaming; Great Renaming; Register renaming; Rename (computing) Rename (relational algebra) See also
High-level synthesis (HLS), sometimes referred to as C synthesis, electronic system-level (ESL) synthesis, algorithmic synthesis, or behavioral synthesis, is an automated design process that takes an abstract behavioral specification of a digital system and finds a register-transfer level structure that realizes the given behavior.
Similarly, in a segment based system, segment descriptors can indicate whether a segment can contain executable code and in what rings that code can run. From the point of view of a process , the code space is the part of its address space where the code in execution is stored.