Apple-M1.md

Examples

• A14
• M1

References

1. Discover Metal enhancements for A14 Bionic
2. Mesa driver details
3. Dissecting the Apple M1 GPU: 1, 2, 3
4. M1 Benchmarks
5. M1 reverse engineering
6. iGPU Cache Setups Compared, Including M1
7. Reverse engineering the Apple G13 GPU architecture

Notes

• fp32 has same rate as fp16. [4]
• that there is a penalty (of exactly one cycle) for switching between FP32 and FP16 operation. ref
• FP32 ALU rate is half of FP16 rate on A14 (and earlier chips). That has not changed on A14. F32 ALU rate relative to F16 increased on M1.

Features

• Ray tracing (software).

Specs

• Local memory (L1): [6]

  • size: 32KB
  • latency: 43ns
  • bandwidth: 671 GB/s

• L2 Cache: [6]

  • size: 1MB
  • latency: 76.3ns
  • bandwidth: 384 GB/s

• System level cache (L3): [6]

  • size: 8MB
  • latency: 266ns
  • bandwidth: 134 GB/s

• RAM: [6]

  • latency: 311ns
  • bandwidth: 50.4 GB/s

• CPU to GPU bandwidth: 17 GB/s [6]

• GPU to CPU bandwidth: 17.5 GB/s [6]