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engine-cuda: loop kernel diagonal from launch parameters (+1.3% loop kernel), multiply-add screening variants #31

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grenade merged 3 commits from perf/int-round-chain into main 2026-09-14 17:01:16 +00:00
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Author SHA1 Message Date
grenadeandClaude Fable 5.1 1fea51cfc3 engine-cuda: loop kernel takes the diagonal from the launch parameters
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MiningUniforms carries the twelve diagonal constants (416 bytes now) and
the loop kernel reads them there (LAIR_LOOP_PARAM_DIAG=1) instead of from
the __constant__ table. Static: still 13 loads per internal round (ptxas
reloads either way) but spill 88 -> 32 bytes. Measured, three interleaved
rounds, loop kernel only: beast 2135 -> 2162 MH/s (+1.3%), benjy 725 ->
730 (+0.7%); parity 300/300 and 200/200. The unrolled kernel is byte-
identical (21,120 instructions, 110 registers).

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Ue5ZZm1Hiv5zPnucykKKuF
 2026-09-14 19:51:22 +03:00
grenadeandClaude Fable 5.1 4572a5e567 engine-cuda: attribute the loop kernel's internal-round excess; drop two no-op knobs 
Constant hoisting in C and 32-bit-halves delivery of the diagonal both
compile to byte-identical SASS and are removed. The remaining 40
instructions per round over the quanpool kernel are itemised in the
kernel comment.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Ue5ZZm1Hiv5zPnucykKKuF
 2026-09-14 19:43:59 +03:00
grenadeandClaude Fable 5.1 338b4a7d32 engine-cuda: LAIR_MULADD screening variants (0 stays; 1-4 measured worse) 
Static screen on sm_120, loop kernel internal round body: 0 = 239,
1 = 260, 2 = 283, 3 = 275, 4 = 265 instructions.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Ue5ZZm1Hiv5zPnucykKKuF
 2026-09-14 19:40:59 +03:00