Search results
Results from the WOW.Com Content Network
Further, as P-code is based on an ideal virtual machine, a P-code program can often be smaller than the same program translated to machine code. Conversely, the two-step interpretation of a P-code based program leads to a slower execution speed, though this can sometimes be addressed with just-in-time compilation , and its simpler structure is ...
Bytecode (also called portable code or p-code) is a form of instruction set designed for efficient execution by a software interpreter.Unlike human-readable [1] source code, bytecodes are compact numeric codes, constants, and references (normally numeric addresses) that encode the result of compiler parsing and performing semantic analysis of things like type, scope, and nesting depths of ...
Machine code is generally different from bytecode (also known as p-code), which is either executed by an interpreter or itself compiled into machine code for faster (direct) execution. An exception is when a processor is designed to use a particular bytecode directly as its machine code, such as is the case with Java processors .
This performance advantage was eroded by the later availability of p-code to native machine code translators, and mainstream 16-bit microprocessors such as the Intel 8086 and Motorola 68000. When details of the MicroEngine were first released, the system accumulated a very large number of pre-orders (for the time).
P-code is an alternative term for bytecode, machine-independent code that achieves independence by targeting a p-code machine, a virtual machine designed for running p-code rather than the intention to emulate any specific hardware architecture.
As much as 35-50 times faster than the LSI-11 interpreter, and 7-9 times faster than the Western Digital Pascal MicroEngine did by replacing the LSI-11 microcode with p-code microcode. It also ran faster than the Niklaus Wirth Lilith machine but lacked the bit-mapped graphics capabilities, and around the same speed as a VAX-11/750 running ...
The system was created before ASCII had been standardized, and, as was typical for machines of the era, used its own custom character set. This held 0 to 9 in locations 0 to 9, A to Z in 10 through 35, and then a number of symbols for a total of 64 characters.
A revision of the p-code engine (i.e., the p-Machine) meant a change to the p-code language, and therefore compiled code is not portable between different p-Machine versions. Each revision was represented with a leading Roman Numeral, while operating system revisions were enumerated as the "dot" number following the p-code Roman Numeral.