Исходники и презентации

lessons/slices_and_arrays/bce_optimization_2/bench_test.go

@@ -0,0 +1,34 @@
+package main
+
+import "testing"
+
+// go test -gcflags="-d=ssa/check_bce" -bench=. bench_test.go
+
+func fn1(s []int, i int) {
+	_ = s[i+3] // Found IsInBounds
+	_ = s[i+2] // Found IsInBounds
+	_ = s[i+1] // Found IsInBounds
+	_ = s[i]   // Found IsInBounds
+}
+
+func fn2(s []int, i int) {
+	s = s[i : i+4] // Found IsSliceInBounds
+	_ = s[3]
+	_ = s[2]
+	_ = s[1]
+	_ = s[0]
+}
+
+func BenchmarkFN1(b *testing.B) {
+	values := []int{1, 2, 3, 4}
+	for i := 0; i < b.N; i++ {
+		fn1(values, 0)
+	}
+}
+
+func BenchmarkFN2(b *testing.B) {
+	values := []int{1, 2, 3, 4}
+	for i := 0; i < b.N; i++ {
+		fn2(values, 0)
+	}
+}