Category:ARM Assembly: Difference between revisions
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The ARM architecture is widely used on mobile phones and tablets. It falls under the category of RISC (Reduced Instruction Set Computer) processors, which means it has fewer opcodes than a CPU such as those in the x86 family. However, it makes up for this with its speed. The ARM and its variants are used in many well-known systems such as the Raspberry Pi, Nintendo DS, iPad, and more.
===Registers===
The ARM has 15 main registers the programmer can use, numbered <code>R0</code> through <code>R15</code>. The higher-numbered ones have special purposes, but <code>R0</code> through <code>R10</code> can be used for anything. In other words, there are no commands that only work with <code>R0</code> (system calls notwithstanding). Registers with a specific purpose have alternate abbreviations that your assembler allows you to use for clarity.
===Barrel Shifter===
The ARM can add a bit shift or rotate to one of its operands at no additional cost to execution time or bytecode. If the operand being shifted is a register, the value of that register is not actually changed. The shift or rotate only applies during that instruction.
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