---
# System prepended metadata

title: word hi lo parts
tags: [scroll documentation]

---

## word hi lo


-   [word lo/hi] pi circuit replace rand/rlc by keccak hash  https://github.com/privacy-scaling-explorations/zkevm-circuits/pull/1345
- word hi/lo utilities (initial version) > 40 files  https://github.com/privacy-scaling-explorations/zkevm-circuits/pull/1394
- [word-lo-hi] evm circuit > 100 files #1411 https://github.com/privacy-scaling-explorations/zkevm-circuits/pull/1411
- State Circuit: Refactor word_rlc into word lo/hi #1423 https://github.com/privacy-scaling-explorations/zkevm-circuits/pull/1423
 
- [word lo/hi] support u16 range lookup #1427 https://github.com/privacy-scaling-explorations/zkevm-circuits/pull/1427
- [word lo/hi] Copy circuit (id --> id_lo, id_hi)#1433  https://github.com/privacy-scaling-explorations/zkevm-circuits/pull/1433
- [word lo/hi] keccak circuit to word (output_rlc --> output.lo + output.hi) #1434  https://github.com/privacy-scaling-explorations/zkevm-circuits/pull/1434
- [word lo/hi] docs and more word utilities #1441 https://github.com/privacy-scaling-explorations/zkevm-circuits/pull/1441
- Bytecode Circuit: Refactor word_rlc into word lo/hi #1468
 https://github.com/privacy-scaling-explorations/zkevm-circuits/pull/1468
- [word lo/hi] add ci subcircuit unit test and fix address assignment #1488  https://github.com/privacy-scaling-explorations/zkevm-circuits/pull/1488
- MPT: lo/hi + challengeAPI + preimage checks + performance improvements >100 files, neccessary for scroll? #1531 https://github.com/privacy-scaling-explorations/zkevm-circuits/pull/1531
- tx circuit  :https://github.com/privacy-scaling-explorations/zkevm-circuits/pull/1418
- merge to main (all in one 139 files, > 6000 lines) https://github.com/privacy-scaling-explorations/zkevm-circuits/pull/1504







