POWERPC

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POWERPC
HARISH KONGARA

• ELEC 5200/6200 Computer Architecture and Design,
  Fall 2006
• Lectured by Dr. V. Agrawal

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• What do the worlds fastest supercomputer,
  network and communications equipment such as
  Internet routers and switches, the Mars Rover,
  consumer electronics such as set top boxes, and
  the game consoles all have in common?

They are powered by microprocessors based on
IBMs Power Architecture instruction set.
POWER is a RISC instruction set architecture
designed by IBM. The name is a backronym for
Performance Optimization With Enhanced RISC
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RISC VS CISC

CISC MUL 23,52 RISC LOAD A, 23 LOAD B,
52 PROD A, B STORE 23, A
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POWER ARCHITECTURE

• The First RISC Chip Design was 801 cpu.
• The Power Architecture Design is a descended
  directly from the 801 cpu.
• The power architecture design was interested
  primarily in fixing 2 problems of 801 cpu design
• ?the 801 required all instructions to
  complete in one clock cycle, which eliminated
  floating point instructions
• ?although the decoder was pipelined as a
  side effect of these single-cycle operations,
  they didn't use superscalar effects

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POWERPC

• PowerPC is largely based on IBM's POWER
  architecture, and retains a high level of
  compatibility with it the architectures have
  remained close enough that the same programs and
  operating systems will run on both if some care
  is taken in preparation.

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POWERPC AND POWER ARCHITECTURE

• The PowerPC architecture is a modified version
  of the POWER architecture.
• The PowerPC architecture added
• ?single-precision floating point instructions
  ? general register-to-register
  multiply and divide instructions, and
• ?removed some POWER features such as the
  specialized multiply and divide instructions
  using the MQ register. It also added a 64-bit
  version of the architecture.

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POWERPC FAMILY OF MICROPROCESSORS

• 601 - The 601 is a fusion of the POWER
  architecture and the PowerPC architecture. It is
  designed to drive mainstream desktop systems. A
  Macintosh with a 601 will deliver integer
  performance three to five times that of todays
  high-end 68040-based Macintosh systems and
  floating point performance around ten times that
  of todays high-end 68040-based Macintosh
  systems.
• 603 - The 603 is the first PowerPC only
  implementation of the PowerPC architecture. It is
  designed for low-cost and low-power consumption.
  The 603 will be used in portable and low-cost
  desktop Macintosh with PowerPC systems. In many
  ways, over time the 603 could become Apples
  replacement for the 68030.
• 604 - The 604 is designed for mainstream desktop
  personal computers. It will cost about as much as
  the 601, but will deliver higher performance.
• 620 - The 620, which is currently still in the
  design phase, is a high-performance
  microprocessor that Motorola and IBM believes
  will be well-suited for very high-end personal
  computers, workstations, servers, and
  multiprocessor systems.

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POWERPC VS PENTIUM

• How the 601 stacks up against Intels
  state-of-the-art CISC design, the Pentium. On a
  basis of price, performance, and power
  consumption, the PowerPC 601 compares quite
  favorably. The 601 delivers integer performance
  that matches and floating-point performance that
  exceeds Pentiums for about half the cost. In
  addition it consumes about half the power of
  Pentium.
• Pentium PowerPC 601
• Frequency 66 MHz
  66 MHz
• Die Size 264 mm2
  120 mm2
• Cache 16K
  32K
• Power 14 Watts
  9 Watts
• SPECInt92 64
  60
• SPECfp92 57
  80
• Price 950.00
  450.00

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APPLE LIKE RISC

• The above comparison give us an idea why Apple
  is staking such a large part of its future on
  RISC. The PowerPC 601 is the first of its
  generation matches the performance of the latest
  CISC chips - and the next PowerPC implementation
  (603) is well under way. While CISC designers
  have to work increasingly hard to squeeze more
  performance out of their designs, at an ever
  increasing manufacturing cost, RISC designs have
  considerable room for growth. The evolution of
  RISC designs has the potential to outstrip the
  evolution of CISC.

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QUICK TOUR OF 601
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OPTIMIZING CODE FOR POWERPC

• INSTRUCTION SCHEDULING
• LOADING REGISTERS
• SCRATCH REGISTERS

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REFERENCES

• http//www.mactech.com/articles/mactech/Vol.10/1
  0.02/ThePowerPC/index.html
• http//www-03.ibm.com/chips/products/powerpc/
• http//en.wikipedia.org/wiki/PowerPC

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THANKS