Exact

Exact Union RegExp

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Transaction Science 7443ce1992 wai-quantum 0.4.4: the fabric's CUDA member ... A second accelerator member beside the WebGPU one: the gate kernel in CUDA C, compiled at run time by the CUDA runtime compiler for each device's own architecture, certified bit-exact against the CPU reference's pinned corpus digests. Feature `quantum_fabric_cuda`, opt-in, native targets only. The kernel (src/quantum_fabric/lanes64.cu) is a transcription of lanes::exact_row and apply_words in 64-bit integers, which every CUDA device has: each fx(a, b) = (a·b + 2^29) >> 30 is exact in 64 bits, each row's sum too, the lane keeps the low 32 bits, and a sum outside 32 bits records the gate's op-log index, the lowest winning. One thread per amplitude pair, one launch per gate, so no thread reads what another writes within a launch. The driver and the runtime compiler are loaded when first used, so a build with the feature runs on a host with no CUDA and finds no member, with the reason (Discovery::unavailable). The member mirrors the WebGPU member's surface: discovery with typed refusals, the arithmetic probe (shared now as lanes::probe_pairs and first_mismatch), run_lanes / run_program, simulate_from and simulate_metered, certify, member and member_metered, a Runner for the Fabric, with_max_qubits and with_source for tests. Its id binds the device, UUID, PCI location, driver, compiler and memory: local/gpu-cuda-<12 hex>, keyed in CI as gpu-cuda-sm<major><minor>. Device tests (tests/cuda_member.rs), on the RTX 4050 (sm_89): the probe agrees on 65,536 pairs; the kernel matches run_words on 2,000 random states and gate words, out-of-range runs included; all four pinned certificates reproduced; random circuits up to 22 qubits and QFTs equal to native; typed refusals; all six kernel mutants caught; a receipt, a placement and a Fabric run; repeated runs identical. On a host with no CUDA the same tests pass over no member. CI: wai-quantum-cuda.yml, on the GPU host (requires the four certificates and every mutant caught) and on a runner with no CUDA (requires the member to say so). Every lockfile that includes wai-quantum moves to 0.4.4 by its version line alone. Co-Authored-By: Claude Opus 5.5 <[email protected]>		2026-10-14 01:14:01 -04:00
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workflows	wai-quantum 0.4.4: the fabric's CUDA member	2026-10-14 01:14:01 -04:00