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Such a memory cell consists of a fixed number of memory elements or bits. The address decoder is connected to an address bus and reads the address created there. Using a special switching logic, it uses this address to calculate which memory cell is to be accessed. It then selects that cell by selecting it via a special control line.
E.g. on Unix-like systems memory pages can be toggled to be executable with the mprotect() system call, and on Windows, VirtualProtect() can be used to achieve a similar result. If an attempt is made to execute machine code on a non-executable page, an architecture specific fault will typically occur.
The shadow registers do not load instructions during instruction fetching and decoding stages and a context switch is unnecessary in this design. IBM uses the same mechanism as many major microprocessors, deeply merging the register file with the decoder, but its register files work independently of the decoder side and do not involve context ...
In computer engineering, instruction pipelining is a technique for implementing instruction-level parallelism within a single processor. Pipelining attempts to keep every part of the processor busy with some instruction by dividing incoming instructions into a series of sequential steps (the eponymous "pipeline") performed by different processor units with different parts of instructions ...
In simpler CPUs, the instruction cycle is executed sequentially, each instruction being processed before the next one is started. In most modern CPUs, the instruction cycles are instead executed concurrently, and often in parallel, through an instruction pipeline: the next instruction starts being processed before the previous instruction has finished, which is possible because the cycle is ...
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