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Post
Ashton Six
ashtonsix.com
did:plc:ireqlx5t3r3whzzifgqtripx
I got SOTA (L1-hot, SIMD) on prefix sum by ADDING instructions (7.7 GB/s → 19.8 GB/s). Consider:
for i = 0..n: out[i] = out[i-1] + in[i]
This SUCKS, because out[i] must wait on out[i-1]. There's an unbroken dependency chain which disrupts Instruction Level Parrallelism (ILP). 1/
2026-01-17T00:55:27.327Z