Captures empirical record from three agents that finished today:
form-A-day2-progress.md (STOPPED, no merge)
v2 Montgomery batch inversion regressed v1 by 0.63x-0.94x
across n in {10k, 100k, 1M}. Byte-identity PASS at every N;
math correct. Root cause: at this N, scalar_mul (256 Jacobian
doubles x 5-6 ModMult each) dominates, NOT _ModInv. v2's Phase
B/D used 1 thread/block leaving ~97% of SMs idle. v1 baseline
re-measured at 7.88 Mkeys/s at n=1M (catalog upward correction
from initial 6.51). Day-3 path: warp-level prefix scan OR
windowed-G ladder.
form-D-axis-flip-RESULTS.md (Form D opt 1 shipped foxhop 1f7ac9d)
Per-candidate axis kernel measured 217 Mops/s at K=32 M=4 on
3090; 23.7x over per-shot N=4 at same M. Both axes saturate
at the same ~220-250 Mops/s, refuting the bandwidth-bound
diagnosis. Axis flip's win is occupancy-amortization at small
M, not bandwidth redistribution.
form-D-build-progress.md (Form D AG kernel parked)
Aaronson-Gottesman tableau dead-end: our point-add circuit
contains no H or S, so state never leaves the computational
basis and AG buys nothing. Three pivot options proposed; fox
picked options 1 + 3 in parallel.
Day-1 binary at lumbda 7661788 stays canonical for
cuda-secp256k1-batched-mul; v2 working-tree code lives uncommitted
on the build host as Day-3 scratch.
russell@unturf.com
b2209ac337