ARM assembly language : fundamentals and techniques by William Hohl

By William Hohl

Written for people with a few history in electronic common sense and high-level programming, this paintings serves as a textual content for brand new programmers, in addition to a reference for college kids and execs. It specializes in what's had to collect for ARM, information genuine meeting makes use of, and explores events that programmers will encounter.

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Extra resources for ARM assembly language : fundamentals and techniques

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4 ARM Assembly Language lengths; supporting complex, multi-cycle instructions, etc. These new architectures would produce a processor that had the following characteristics: • All instructions executed in a single cycle. This was unusual in that many instructions in processors of that time took multiple cycles. The trade-off was that an instruction such as MUL (multiply) was available without having to build it from shift/add operations, making it easier for a programmer, but it was more complicated to design the hardware.

With each new generation of processor, features were always added for performance, but that only complicated the design. CISC architectures became very difficult to debug and validate so that manufacturers could sell them with a high degree of confidence that they worked as specified. • The processor would access data from external memory with explicit instructions—Load and Store. All other data operations, such as adds, subtracts, and logical operations, used only registers on the processor. This differed from CISC architectures where you were allowed to tell the processor to fetch data from memory, do something to it, and then write it back to An Overview of Computing Systems 5 memory using only a single instruction.

The acronym RISC has definitely evolved beyond its own moniker, where the original idea of a Reduced Instruction Set, or removing complicated instructions from a processor, has been buried underneath a mountain of new, albeit useful instructions. And all manufacturers of RISC microprocessors are guilty of doing this. More and more operations are added with each new generation of processor to support the demanding algorithms used in modern equipment. This is referred to as “feature creep” in the industry.

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