849c5069fc
Seven End Turns from ref-turn2.sav on VM140, six control words, whole-state checksum on every post-turn autosave. 53-bit and 64-bit x87 give byte-identical state across all 35,394 leaves, so an x64/SSE port computing in IEEE double has NO double-rounding budget to preserve and floats=bits is free. Two settings do move state, each reproduced on a repeat run: 0x007f (24-bit) Sys[112 "Gamma Cephei"]/Pop2/PopG/PopC 540000000 -> 540000002 0x1a7f (round-up) Flt[34 "Beta Fleet"]/Pos/.[0] and /Pos/.[2], 1 ULP each So the port must hold intermediates at 53 bits and use round-to-nearest -- both SSE defaults, now measured rather than assumed, each with a named regression witness. The briefed triple was under-powered: 0x027f is 53-bit (it differs from 0x127f only in bit 12, infinity control, ignored since the 387) and 0x137f is 64-bit, not a rounding change. Run as written all three come back identical, and that would have "proved" something false on both axes that matter. Evidence the forced word actually held: read-back at each force site plus 38 independent in-pipeline hook samples per run spanning turn phases 4, 6 and 8, all reading the forced value. Mars::Application::Run calls _controlfp(0x50000,0x3070300) at 0x0089f606 every frame, which is 0x127f, so forcing at StrategyClient::EndTurn is wiped before the turn runs; StrategyServer::BeginProcessTurn is the point that works. Also re-confirms the End-Turn determinism oracle on engine cef889e: bb4fd9ac... / 978041ac... unchanged. New tools: verify/fpu-cw/cw_census.py, verify/fpu-cw/trace_bitdiff.py (the latter exists because under a forced 24-bit word the CRT's own %g rendering degrades, so trace text is not a valid comparison surface).
36 lines
2.1 KiB
Text
36 lines
2.1 KiB
Text
== verify/results/fpu-cw/run-007f/shim.trace.jsonl.gz (2212 hook records)
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Game::ServerSystem::ProcessTurn cw=0x007f x28 call_id 1110..1137
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Game::StrategyServer::MoveFleet cw=0x007f x7 call_id 1103..1109
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Game::TechTree::ProcessResearch cw=0x007f x3 call_id 1140..1144
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ALL SAMPLES: 0x007f x38
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== verify/results/fpu-cw/run-027f/shim.trace.jsonl.gz (2231 hook records)
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Game::ServerSystem::ProcessTurn cw=0x027f x28 call_id 1134..1161
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Game::StrategyServer::MoveFleet cw=0x027f x7 call_id 1127..1133
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Game::TechTree::ProcessResearch cw=0x027f x3 call_id 1164..1168
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ALL SAMPLES: 0x027f x38
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== verify/results/fpu-cw/run-127f/shim.trace.jsonl.gz (2317 hook records)
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Game::ServerSystem::ProcessTurn cw=0x127f x28 call_id 1195..1222
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Game::StrategyServer::MoveFleet cw=0x127f x7 call_id 1188..1194
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Game::TechTree::ProcessResearch cw=0x127f x3 call_id 1225..1229
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ALL SAMPLES: 0x127f x38
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== verify/results/fpu-cw/run-137f/shim.trace.jsonl.gz (2280 hook records)
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Game::ServerSystem::ProcessTurn cw=0x137f x28 call_id 1152..1179
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Game::StrategyServer::MoveFleet cw=0x137f x7 call_id 1145..1151
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Game::TechTree::ProcessResearch cw=0x137f x3 call_id 1182..1186
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ALL SAMPLES: 0x137f x38
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== verify/results/fpu-cw/run-1a7f/shim.trace.jsonl.gz (2304 hook records)
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Game::ServerSystem::ProcessTurn cw=0x1a7f x28 call_id 1187..1214
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Game::StrategyServer::MoveFleet cw=0x1a7f x7 call_id 1180..1186
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Game::TechTree::ProcessResearch cw=0x1a7f x3 call_id 1217..1221
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ALL SAMPLES: 0x1a7f x38
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== verify/results/fpu-cw/run-off/shim.trace.jsonl.gz (2449 hook records)
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Game::ServerSystem::ProcessTurn cw=0x127f x28 call_id 1152..1179
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Game::StrategyServer::MoveFleet cw=0x127f x7 call_id 1145..1151
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Game::TechTree::ProcessResearch cw=0x127f x3 call_id 1182..1186
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ALL SAMPLES: 0x127f x38
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