zeekay
42b3fe391c
Replace the hand-rolled ${SRCDIR}/../../../../luxcpp/... CFLAGS+LDFLAGS
blocks in cevm_cgo.go and cevm_secp256k1.go with the canonical .pc
bundles. External Go consumers building from \$GOMODCACHE no longer
need a luxcpp checkout next to lux/; they only need the install prefix
on \$PKG_CONFIG_PATH.
cevm_cgo.go consumes lux-cevm (libevm + libevm-gpu + transitive
GPU-host static archives).
cevm_secp256k1.go consumes lux-crypto-secp256k1 (libsecp256k1_cpu +
libkeccak_cpu). libsecp256k1_metal stays on the build-tree path with
the existing darwin-only anchor file until a separate .pc bundle for
the Metal driver lands.
cevm — C++ EVM execution backend
The CGO bridge to the C++ EVM in ~/work/luxcpp/cevm. Selected at link time
via build tags from chains/evm/backend_{cgo,nocgo}.go.
This is not a standalone VM. It is the GPU-accelerated execution backend
for C-Chain when built with LUX_CGO=1. The pure-Go fallback (luxfi/geth)
is used when LUX_CGO=0.
Layout
chains/evm/
├── main.go # luxd plugin entry
├── backend_cgo.go # cgo backend selector (LUX_CGO=1)
├── backend_nocgo.go # pure-Go selector (LUX_CGO=0)
└── cevm/ # this package — C++ FFI shim
├── cevm.go # Go API
├── cevm_cgo.go # cgo bindings (linked against luxcpp libs)
├── cevm_nocgo.go # no-op stubs for !cgo builds
└── plugin.go # plugin registration glue
Linking
cevm_cgo.go references ${SRCDIR}/../../../../luxcpp/... for headers and
libs. From ~/work/lux/chains/evm/cevm/ that resolves to ~/work/luxcpp/.
For module-cache builds, see accel's fetch-luxcpp.sh pattern (TODO: port
the same approach here).
Performance
When CGO is enabled and luxcpp libs are available:
- ~3–5× the throughput of pure-Go EVM
- SIMD opcode dispatch (AVX2/NEON)
- GPU batch operations via Block-STM (CUDA/Metal)
Provenance
Folded into chains/evm from the previously-standalone luxfi/cevm repo on
2026-04-30. cevm is internal-only — no operator daemon. C-Chain runs in luxd.
See ~/work/lux/chains/PLUGGABLE.md for the canonicalization pattern that
governs the rest of the chain VMs.