![]() ![]() ![]() Without going into too many details, let us just say that operations inside the CPU must be very carefully coordinated or the CPU will produce erroneous results. The CPU is a very complex piece of circuitry. ![]() For those interested in writing fast software, a natural question to ask is, "How does the processor execute statements, and how do we measure how long they take to execute?" ![]() As you might expect, the second Pascal statement above takes quite a bit longer to execute than the first. Likewise, multiplying I by five and then adding two and storing the result back into I takes time. Moving a copy of J into I takes a certain amount of time. Of course, on real computer systems, operations do not occur instantaneously. It wouldn't do, for example, to execute the statement I:=I*5+2 before I :=J in the following sequence:Ĭlearly we need some way to control which statement executes first and which executes second. This means that the computer executes commands in a prescribed order. On Von Neumann machines, like the 80x86, most operations are serialized. Art of Assembly: Chapter Three-2 ģ.2 - System Timing 3.2.1 - The System Clock 3.2.2 - Memory Access and the System Clock 3.2.3 - Wait States 3.2.4 - Cache MemoryĪlthough modern computers are quite fast and getting faster all the time, they still require a finite amount of time to accomplish even the smallest tasks. ![]()
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