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Author Topic: How can I know the instruction format of a given computer system  (Read 9266 times)

Offline maplesirop

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How can I know the instruction format of a given computer system
« on: April 01, 2013, 05:34:08 PM »
I know how to get the number of bits of an opcode based on the number of instructions, but how do you know the size of the operand field for instance?
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Offline hhh3h

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Re: How can I know the instruction format of a given computer system
« Reply #1 on: April 04, 2013, 04:24:37 PM »
As far as I understand, that information is not something you "get" with code.  You need to know what platform you're coding for before you start coding.  For example, if you want to write a program for the family of x86 or x86-64 CPU's, you can refer to the Intel manuals for this information.  On the other hand, if you want to write a program for an ARM CPU, you would get the manual from ARM
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