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HP-UX 11i Internals by Chris Moore, Chris Cooper

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PA-RISC Instructions

The PA-RISC instruction set can be divided into seven general categories of instructions:

  • Memory reference instructions— Instructions that explicitly move data to or from memory.

  • Computation instructions— Instructions that perform basic arithmetic, logical operations, shifts and rotates, and bit operations.

  • Branch instructions— Instructions to alter the order of instructions execution, either conditionally or unconditionally, with or without saving a link pointer to return to the current instruction stream.

  • Multimedia instructions— Instructions that perform multiple parallel operations on 16-bit values packed into a single register. These instructions are designed to speed operations typically used in multimedia applications ...

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