add asm features

Cargo.toml

@@ -27,6 +27,7 @@ rand = "0.8"
 rand_core = { version = "0.6", default-features = false }
 
 [features]
+default = []
 asm = []
 
 [profile.bench]

README.md

@@ -1,11 +1,25 @@
+# BN256 pairing
+
 BN256 pairing library that implements original traits from `zkcrypto`,
 
 * [`zkcrypto/ff`](https://github.com/zkcrypto/ff)
 * [`zkcrypto/group`](https://github.com/zkcrypto/group)
 * [`zkcrypto/pairing`](https://github.com/zkcrypto/pairing)
-  
+
 and plus
 
 `FieldExt`, `CurveExt` [traits](https://github.com/zcash/pasta_curves/tree/main/src/arithmetic) that are used in `halo2` library.
 
-This implementation is mostly ported from [matterlabs/pairing](https://github.com/matter-labs/pairing/tree/master/src/bn256) and [zkcrypto/bls12-381](https://github.com/zkcrypto/bls12_381).
+This implementation is mostly ported from [matterlabs/pairing](https://github.com/matter-labs/pairing/tree/master/src/bn256) and [zkcrypto/bls12-381](https://github.com/zkcrypto/bls12_381).
+
+## Bench
+
+None Assembly
+```
+$ cargo test --profile bench test_field -- --nocapture
+```
+
+Assembly
+```
+$ cargo test --profile bench test_field --features asm -- --nocapture
+```