8.5 64-Bit RISC Microprocessors
Typical 64-bit RISC microprocessors include the Alpha 21164 (Digital Equipment Corporation), the PowerPC 620 (Motorola/IBM/Apple) and the Ultrasparc (Sun Microsystems). These 64-bit processors are ideal candidates for data crunching machines and high-performance desktop systems/workstations.
The number of instructions issued per cycle has been increasing steadily. For example, the PowerPC 601 can issue instructions to the integer, floating-point, and branch-processing units in one and the same cycle. The 64-bit RISC microprocessors can typical issue four instructions to six independent units or more.
These 64-bit processors include multiple integer units which allow multiple integer operations in each cycle. ...
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