added benchmarks for G_T

Cargo.toml

@@ -9,7 +9,6 @@ repository = "https://github.com/filecoin-project/blstrs"
 documentation = "https://docs.rs/blstrs"
 categories = ["cryptography", "algorithms"]
 readme = "README.md"
-rust-version = "1.56.1"
 
 [package.metadata.docs.rs]
 rustdoc-args = [ "--html-in-header", "katex-header.html" ]

benches/bls12_381/ec.rs

@@ -167,3 +167,56 @@ mod g2 {
         });
     }
 }
+
+mod gt {
+    use rand_core::SeedableRng;
+    use rand_xorshift::XorShiftRng;
+
+    use blstrs::*;
+    use ff::Field;
+    use group::Group;
+
+    #[bench]
+    fn bench_gt_add_assign(b: &mut ::test::Bencher) {
+        const SAMPLES: usize = 1000;
+
+        let mut rng = XorShiftRng::from_seed([
+            0x59, 0x62, 0xbe, 0x5d, 0x76, 0x3d, 0x31, 0x8d, 0x17, 0xdb, 0x37, 0x32, 0x54, 0x06,
+            0xbc, 0xe5,
+        ]);
+
+        let v: Vec<(Gt, Gt)> = (0..SAMPLES)
+            .map(|_| (Gt::random(&mut rng), Gt::random(&mut rng)))
+            .collect();
+
+        let mut count = 0;
+        b.iter(|| {
+            let mut tmp = v[count].0;
+            tmp += v[count].1;
+            count = (count + 1) % SAMPLES;
+            tmp
+        });
+    }
+
+	#[bench]
+	fn bench_gt_mul_assign(b: &mut ::test::Bencher) {
+	    const SAMPLES: usize = 1000;
+
+	    let mut rng = XorShiftRng::from_seed([
+	        0x59, 0x62, 0xbe, 0x5d, 0x76, 0x3d, 0x31, 0x8d, 0x17, 0xdb, 0x37, 0x32, 0x54, 0x06,
+	        0xbc, 0xe5,
+	    ]);
+
+	    let v: Vec<(Gt, Scalar)> = (0..SAMPLES)
+	        .map(|_| (Gt::random(&mut rng), Scalar::random(&mut rng)))
+	        .collect();
+
+	    let mut count = 0;
+	    b.iter(|| {
+	        let mut tmp = v[count].0;
+	        tmp *= v[count].1;
+	        count = (count + 1) % SAMPLES;
+	        tmp
+	    });
+	}
+}