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sots-re/verify/results/fpu-cw/run-007f/shim.log
alex 849c5069fc lane F: x87 precision sensitivity measured; STATE_CHECKSUM 3.5 closed 
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).
2026-09-08 05:07:53 -04:00

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04:19:06.590 [tid 7008] ==== sots-engine shim (binkw32 proxy) build fpucw-cef889e-20260908T0803Z ====
04:19:06.590 [tid 7008] exe: C:\SOTS\Sword of the Stars.exe
04:19:06.590 [tid 7008] exe base=0x00e80000 (link-time image base 0x00400000, ASLR delta +11010048) pid=1276 shim=696a0000
04:19:06.590 [tid 7008] addresses: Source: sots-re ghidra/addresses.json @ f5b37c2, generated 2026-09-08 by tools/gen_addresses.py
04:19:06.606 [tid 7008] config: hooks=trace
04:19:06.606 [tid 7008] config: hook.Shim::SelfTest::Fill=off
04:19:06.606 [tid 7008] config: hook.Mars::GlobalConsts::LoadFile=off
04:19:06.606 [tid 7008] config: hook.Game::WeaponDictionary::Init=off
04:19:06.606 [tid 7008] config: hook.Game::SectionDictionary::SectionDictionary=off
04:19:06.606 [tid 7008] config: hook.Game::StrategyServer::ProcessFleetMovement=off
04:19:06.606 [tid 7008] config: hook.Game::TechTree::ProcessResearch=trace
04:19:06.606 [tid 7008] config: hook.Game::ServerPlayer::ComputeBudget=trace
04:19:06.606 [tid 7008] config: hook.Game::ServerPlayer::OnTechResearched=trace
04:19:06.606 [tid 7008] config: hook.Game::ServerSystem::ProcessTurn=trace
04:19:06.606 [tid 7008] config: hook.Game::StrategyServer::MoveFleet=trace
04:19:06.606 [tid 7008] config: trace.path=C:\SOTS\shim.trace.jsonl
04:19:06.606 [tid 7008] config: trace.inline_max=256
04:19:06.606 [tid 7008] config: trace.flush=always
04:19:06.606 [tid 7008] config: fpu.force=0x007f
04:19:06.606 [tid 7008] config: fpu.sample_ticks=on
04:19:06.653 [tid 7008] trace: C:\SOTS\shim.trace.jsonl (default mode trace, inline_max 256, flush always)
04:19:06.653 [tid 7008] hook: Mars_Application_Initialize rva=0x004a0e50 -> va=01320e50
04:19:06.653 [tid 7008] hook: MH_Initialize -> MH_OK
04:19:06.653 [tid 7008] hook: MH_CreateHook -> MH_OK (trampoline=01740fe0)
04:19:06.668 [tid 7008] hook: MH_EnableHook -> MH_OK
04:19:06.668 [tid 7008] cfg: GlobalConsts hook ready (scale constant 0.017453292519943295)
04:19:06.668 [tid 7008] hook: Mars::GlobalConsts::LoadFile rva=0x004b73c0 mode=off (not installed)
04:19:06.668 [tid 7008] dict: dictionaries hook ready (crt new=6adc232b delete=6adc0174)
04:19:06.668 [tid 7008] hook: Game::WeaponDictionary::Init rva=0x0019a4c0 mode=off (not installed)
04:19:06.668 [tid 7008] hook: Game::SectionDictionary::SectionDictionary rva=0x00176f40 mode=off (not installed)
04:19:06.668 [tid 7008] research: ProcessResearch hook ready (Cost=00ffda00, node=0x34, rng=0x9cc, fpu_cw=0x027f)
04:19:06.668 [tid 7008] hook: Game::TechTree::ProcessResearch rva=0x001876c0 -> va=010076c0 MH_CreateHook -> MH_OK (trampoline=01740fc0)
04:19:06.684 [tid 7008] hook: Game::TechTree::ProcessResearch MH_EnableHook -> MH_OK mode=trace
04:19:06.684 [tid 7008] techfx: OnTechResearched hook ready (regions=15, gate=0/0, fpu_cw=0x027f)
04:19:06.684 [tid 7008] hook: Game::ServerPlayer::OnTechResearched rva=0x00491790 -> va=01311790 MH_CreateHook -> MH_OK (trampoline=01740fa0)
04:19:06.700 [tid 7008] hook: Game::ServerPlayer::OnTechResearched MH_EnableHook -> MH_OK mode=trace
04:19:06.700 [tid 7008] hook: Game::ServerPlayer::ComputeBudget rva=0x00463030 -> va=012e3030 MH_CreateHook -> MH_OK (trampoline=01740f80)
04:19:06.715 [tid 7008] hook: Game::ServerPlayer::ComputeBudget MH_EnableHook -> MH_OK mode=trace
04:19:06.715 [tid 7008] hook: Game::ServerSystem::ProcessTurn rva=0x003598e0 -> va=011d98e0 MH_CreateHook -> MH_OK (trampoline=01740f60)
04:19:06.731 [tid 7008] hook: Game::ServerSystem::ProcessTurn MH_EnableHook -> MH_OK mode=trace
04:19:06.731 [tid 7008] hook: Game::StrategyServer::MoveFleet rva=0x003d9ee0 -> va=01259ee0 MH_CreateHook -> MH_OK (trampoline=01740f40)
04:19:06.747 [tid 7008] hook: Game::StrategyServer::MoveFleet MH_EnableHook -> MH_OK mode=trace
04:19:06.747 [tid 7008] hook: Game::StrategyServer::ProcessFleetMovement rva=0x003da9a0 mode=off (not installed)
04:19:06.747 [tid 7008] fpu: module init, entry cw=0x027f 53bit-double/nearest; force=on value=0x007f sample_ticks=on
04:19:06.747 [tid 7008] fpu: StrategyClient::EndTurn rva=0x00383be0 -> va=01203be0 MH_CreateHook -> MH_OK (trampoline=01740f20)
04:19:06.762 [tid 7008] fpu: StrategyClient::EndTurn MH_EnableHook -> MH_OK
04:19:06.762 [tid 7008] fpu: StrategyServer::BeginProcessTurn rva=0x003d98e0 -> va=012598e0 MH_CreateHook -> MH_OK (trampoline=01740f00)
04:19:06.762 [tid 7008] fpu: StrategyServer::BeginProcessTurn MH_EnableHook -> MH_OK
04:19:06.762 [tid 7008] fpu: StrategyServer::ProcessTurn rva=0x003dc6c0 -> va=0125c6c0 MH_CreateHook -> MH_OK (trampoline=01740ee0)
04:19:06.778 [tid 7008] fpu: StrategyServer::ProcessTurn MH_EnableHook -> MH_OK
04:19:06.778 [tid 7008] fpu: DemoApp::OnTick rva=0x0049a640 -> va=0131a640 MH_CreateHook -> MH_OK (trampoline=01740ec0)
04:19:06.793 [tid 7008] fpu: DemoApp::OnTick MH_EnableHook -> MH_OK
04:19:06.793 [tid 7008] selftest: Shim::SelfTest::Fill mode=off checksum=075ef0c3 records=0
04:19:06.809 [tid 7008] Application::Initialize called (this=03528128)
04:19:07.528 [tid 7008] fpu: TICK BASELINE at OnTick (this=03528128): cw=0x127f 53bit-double/nearest
04:23:06.089 [tid 7008] fpu: FORCE at StrategyClient::EndTurn (this=0e2aa720): observed=0x127f 53bit-double/nearest -> requested=0x007f -> readback=0x007f 24bit-single/nearest OK
04:23:09.152 [tid 7008] fpu: FORCE at StrategyClient::EndTurn (this=34b68d80): observed=0x127f 53bit-double/nearest -> requested=0x007f -> readback=0x007f 24bit-single/nearest OK
04:23:09.167 [tid 7008] fpu: FORCE at StrategyClient::EndTurn (this=34b64bf8): observed=0x007f 24bit-single/nearest -> requested=0x007f -> readback=0x007f 24bit-single/nearest OK
04:23:09.198 [tid 7008] fpu: FORCE at StrategyClient::EndTurn (this=34b65340): observed=0x007f 24bit-single/nearest -> requested=0x007f -> readback=0x007f 24bit-single/nearest OK
04:23:10.152 [tid 7008] fpu: FORCE at StrategyServer::BeginProcessTurn (this=0e208b28): observed=0x127f 53bit-double/nearest -> requested=0x007f -> readback=0x007f 24bit-single/nearest OK
04:23:10.152 [tid 7008] fpu: sample at StrategyServer::ProcessTurn (this=0e208b28): cw=0x007f 24bit-single/nearest
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