3
Why? [Architecture Reasons]
Why? [Architecture Reasons]
• ILP increasingly difficult to extract from
instruction stream
• Control hardware dominates µ processors
– Complex, difficult to build and verify
– Takes substantial fraction of die
– Scales poorly
• Pay for max throughput, sustain average throughput
• Quadratic dependency checking
– Control hardware doesn’t do any math!
• Intel Core Duo: 48 GFLOPS, ~10 GB/s
• NVIDIA G80: 330 GFLOPS, 80+ GB/s
