History Bit Storage

• Store in ICache ( Alpha, UltraSparc)

• Store in Branch History Table (BHT) - Figure 8.27

  • Accessed in Parallel with I-Cache
  • Addressed by lower port of Address bits
  • PowerPC 604 has 128 x 4 entries, each entry is 2 bits. Entries are fetched in parallel with 4 instructions from I-Cache.a

Previous slide

Next slide

Back to first slide

View graphic version