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zeekayandHanzo Dev
ab531a264b
The GPU backend was a build-time PLACE: five mutually-exclusive build-tag
files (orderbook_gpu_{cuda,hip,vulkan,metal,stub}.go), each redefining
gpuMatchOrder + dexBackendLabel and each #cgo pkg-config'ing its own
per-vendor bundle (lux-dex-orderbook-{cuda,hip,metal,vulkan}). Which kernel
you got was frozen at compile time by -tags.
Make it a runtime VALUE. Collapse the five into the single cgo file
orderbook_gpu.go (//go:build cgo, no os/vendor tags), which links one
unified pkg-config bundle, lux-gpu, and calls the shared C ABI in dex_gpu.h:
int lux_gpu_dex_match_order(...) // rc 0 ok, -2 unsupported -> CPU
const char* lux_gpu_backend_name() // runtime-selected: cuda|hip|metal|cpu
liblux_gpu picks the best device at runtime (accel SelectBestBackend). The
MatchOrderGPU dispatcher, errOrderBookGPUUnsupported sentinel, GPU_DISABLE
policy, and byte-parity padding normalization are unchanged. dexBackendLabel
now reports the runtime backend via C.GoString(C.lux_gpu_backend_name()).
The !cgo CPU fallback (orderbook_nogpu.go) and MatchOrderCPU oracle are
untouched; the seam is now exactly cgo vs !cgo, nothing finer.
Verified: CGO_ENABLED=0 full pkg-config build+vet+`go test -run Match|Batch`
green. cgo path built+linked+run against a throwaway stub lux-gpu.pc (ABI
type-checks; rc -2 -> CPU fallback; backend label wired) — real GPU kernel
parity is CI-verified against liblux_gpu on the arcd runners.
Co-authored-by: Hanzo Dev <[email protected]>