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Machine instructions created in earlier microprocessors were retained throughout microprocessor upgrades. This enabled consumers to purchase new computers without having to purchase new application software. The major categories of instructions are: [c] Memory instructions to set and access numbers and strings in random-access memory.
Instead, some special registers in some microcontroller architectures require special instructions to modify them. For example, the program counter is not directly writeable in many microcontroller architectures. Instead, the programmer uses instructions such as return from subroutine, jump, or branch to modify the program counter.
The idea of a subroutine was worked out after computing machines had already existed for some time. The arithmetic and conditional jump instructions were planned ahead of time and have changed relatively little, but the special instructions used for procedure calls have changed greatly over the years.
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SMM, with some of its own special instructions, is available on some Intel i386SL, i486 and later CPUs. Finally, in long mode (AMD Opteron onwards), 64-bit instructions, and more registers, are also available. The instruction set is similar in each mode but memory addressing and word size vary, requiring different programming strategies.
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Complex instructions are implemented by microcode that consists of predefined sequences of micro-operations. [22] Some processor designs use machine code that runs in a special mode, with special instructions, available only in that mode, that have access to processor-dependent hardware, to implement some low-level features of the instruction set.
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