mleku 14dc85cdc3 Add BMI2/AVX2 field assembly and SIMD comparison benchmarks ...

- Port field operations assembler from libsecp256k1 (field_amd64.s,
    field_amd64_bmi2.s) with MULX/ADCX/ADOX instructions
  - Add AVX2 scalar and affine point operations in avx/ package
  - Implement CPU feature detection (cpufeatures.go) for AVX2/BMI2
  - Add libsecp256k1.so via purego for native C library comparison
  - Create comprehensive SIMD benchmark suite comparing btcec, P256K1
    pure Go, P256K1 ASM, and libsecp256k1
  - Add BENCHMARK_SIMD.md documenting performance across implementations
  - Remove BtcecSigner, consolidate on P256K1Signer as primary impl
  - Add field operation tests and benchmarks (field_asm_test.go,
    field_bench_test.go)
  - Update GLV endomorphism with wNAF scalar multiplication
  - Add scalar assembly (scalar_amd64.s) for optimized operations
  - Clean up dependencies and update benchmark reports

2025-11-29 08:11:13 +00:00

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