Friday, February 14, 2014

ARM Immediate Value Encoding

Alisdair McDiarmid:

The rotated byte encoding allows the 12-bit value to represent a much more useful set of numbers than just 0–4095.

ARM immediate values can represent any power of 2 from 0 to 31. So you can set, clear, or toggle any bit with one instruction.

More generally, you can specify a byte value at any of the four locations in the word.

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