git squash commit for iai-benchmarks.

54671350698ec53bb67cb827bf86f96fcc2ba49f
.

7cfc1838cc3316f0b0ce0e567adf9df83d7cea59
.

Cargo.toml

@@ -33,6 +33,7 @@ criterion = "0.3.1"
 getopts = "0.2.14"
 glium = { version = "0.32", features = ["glutin"], default-features = false }
 glob = "0.3"
+iai = "0.1"
 rand = "0.8.4"
 term = "0.7"
 
@@ -50,3 +51,9 @@ path = "benches/unfilter.rs"
 name = "unfilter"
 harness = false
 required-features = ["benchmarks"]
+
+[[bench]]
+path = "benches/decoder_iai.rs"
+name = "decoder_iai"
+harness = false
+

benches/decoder.rs

@@ -20,7 +20,7 @@ criterion_main!(benches);
 
 fn bench_file(c: &mut Criterion, data: Vec<u8>, name: String) {
     let mut group = c.benchmark_group("decode");
-    group.sample_size(20);
+    //group.sample_size(20);
 
     let decoder = Decoder::new(&*data);
     let mut reader = decoder.read_info().unwrap();

benches/decoder_iai.rs

@@ -0,0 +1,33 @@
+use iai::black_box;
+
+fn decode(data: &[u8]) -> Vec<u8> {
+    let data = black_box(data);
+    let decoder = png::Decoder::new(data);
+    let mut reader = decoder.read_info().unwrap();
+    let mut image = vec![0; reader.output_buffer_size()];
+    reader.next_frame(&mut image).unwrap();
+    image
+}
+
+fn iai_decode_kodim02() -> Vec<u8> {
+    decode(include_bytes!("../tests/benches/kodim02.png"))
+}
+
+fn iai_decode_kodim07() -> Vec<u8> {
+    decode(include_bytes!("../tests/benches/kodim07.png"))
+}
+
+fn iai_decode_kodim17() -> Vec<u8> {
+    decode(include_bytes!("../tests/benches/kodim17.png"))
+}
+
+fn iai_decode_kodim23() -> Vec<u8> {
+    decode(include_bytes!("../tests/benches/kodim23.png"))
+}
+
+iai::main!{
+    iai_decode_kodim02,
+    iai_decode_kodim07,
+    iai_decode_kodim17,
+    iai_decode_kodim23,
+}