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RandomX v2 #317

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@SChernykh SChernykh commented Jan 26, 2026

RandomX v2 includes the following changes:

  • Program size increased from 256 to 384
  • CFROUND is tweaked to change the rounding 16 times less often
  • Group F and group E register mix is done using 16 AES operations (the extra 262144 AES ops come from this change)
  • Dataset prefetch is 2 iterations ahead instead of 1

RandomX v1 hash: 4194304 VM instructions + 262144 AES = 4456448 total ops
RandomX v2 hash: 6291456 VM instructions + 524288 AES = 6815744 total ops (+52.9%)

See design_v2.md and search for "RandomX v2" in specs.md for more details on the tweaks.

tevador and others added 21 commits January 22, 2026 16:20
@tevador @SChernykh
RandomX v2 virtual machine changes
1115ec9 
* CFROUND becomes conditional with a 1/16 chance of writing into fprc
* F and E registers are mixed together with AES instead of XOR
@SChernykh
Interpreter support for v2, tests
fce33ee
@SChernykh
Enabled CI
da7af41
@SChernykh
RISC-V: added CFROUND v2
ebe57ef
@SChernykh
RISC-V: added v2 FE mix code (hardware AES)
3f46cd7
@SChernykh
RISC-V: added v2 FE mix code (software AES)
8c80f3a
@SChernykh
API to switch between v1 and v2 on the fly
19cd192
@SChernykh
RISC-V: added v2 FE mix code (scalar software AES)
02f6c4d
@SChernykh
Set v2 program size to 384
4821dbf
@SChernykh
Improved RISC-V code
5891f5d
@SChernykh
Updated documentation for v2
67df5bd
@SChernykh
Improved RISC-V code
6d915f6
@SChernykh
Added v2 design doc
1cefbd7
@SChernykh
Added more CPU benchmarks
6346aa4
@SChernykh
Added prefetch tweak (x64 only for now)
4d3c4f2
@SChernykh
Fixed v2 prefetch code
52406c6
@SChernykh
Prefetch first 2 iterations of the loop
d2a2e93
@SChernykh
Prefetch tweak (RISC-V)
d82f065
@SChernykh
Prefetch tweak (aarch64)
ddfd0c4
@SChernykh
Updated CPU tests
0fcd8f6
@SChernykh
Cleanup
b4a374a
@SChernykh SChernykh requested review from hyc and tevador January 26, 2026 12:01
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@tevador tevador Awaiting requested review from tevador

@hyc hyc Awaiting requested review from hyc

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@SChernykh @tevador