Instruction/ maintenance manual of the product PowerPC G5 Apple
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Po w erPC G5 T he W orld’ s F irst 64-Bit Desktop P roce ssor White P aper July 2003.
Co nte n t s P age 3 Introduction P age 4 The World’ s First 64-Bit Desktop P rocessor An Exponential Leap in C omputing P ower M emory Addressing up to 1 8 Exabytes High-Precision C alculations in .
In troduction T he revolutionary P owerPC G5 changes everything you know about personal computing. Suddenly , the next generation of high-performance applications for design and graphics, media production, and scientific research is possible and practical on the desktop .
T he W orld’ s F irst 64-Bit De sktop P roc essor T he P owerPC G5 marks the arrival of 64-bit per formance to the personal computer market. With 6 4-bit-wide data paths and registers , this groundb.
High-Pr ecision Calculations in a Single Clock C ycle With 64-bit-wide data paths and registers, the P owerPC G5 can execute instructions on 64 bits of data in a single clock cycle—mak ing it possible to perform huge integer calculations and highly precise floating-point mathematics.
Native C ompatibilit y with 3 2-Bit Application Code On other platforms, switching to a 64-bit computer requires migrating t o a 64-bit operating system (and purchasing 64-bit applications) or running a 3 2-bit operating system in a slow emulation mode.
Next-G enera tion P ow erPC Archit ec ture T he P owerPC G5 is a highly parallel implementation of the P owerPC architecture , capable of handling multiple assorted tasks at the same time.
Highly P arallel Execution Core At the heart of the Pow erPC G5 is an entirely new superscalar , superpipelined execution core, composed of 1 2 functional units that execute differ ent types of instructions con- currently for massiv e data throughput.
Optimized 1 28-Bit V elocit y Engine T he P owerPC G5 uses a dual-pipelined V elocity Engine optimized with two independent queues and dedicated 1 28-bit regist ers and data paths f or efficient instruction and data flow .
C ondition Register Th is special 3 2-bit register summarizes the stat es of the floating-point and integer units . T he condition register also indicate s the results of comparison operations and provides a means for testing them as branch conditions .
Industr y-Leading Pe rf ormance Ultrafast clock speeds and a highly parallel 64-bit architecture make the P owerPC G5 ideal for next-generation multimedia, graphics, and scientific applications. Integer and floating-point math calculations are faster than ev er thanks to 64-bit-wide registers and data paths.
SPECint_base2000 and SPECfp_base2 000 measure the speed of a single task—either an integer calculation or a floating-point calculation—ex ecuting on a single processor . Each test measures ho w long the processor takes to complete the benchmark set of single tasks relative to a SPEC-defined baseline score .
F or comparisons that more accurately demonstrate the performance of a dual proces- sor system, VeriT est used the “SPEC rate ” metrics, which recognize multiple processors.
T echnical Specifica tions 64-bit P owerPC proc essor architecture •V ir tual address range: 64 bits, or 1 8 exabyt es •P hy sical address range: 42 bits, or 4 terabytes •F ull 64-bit data paths.
Thr ee-component branch prediction logic •S peculative superscalar inner core organization •F ast, selective flush of incorrect speculative instructions and results •P r edic tion of up to two b.
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