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max_test.go
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max_test.go
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package main
import (
"testing"
)
func if_max(values []int) int {
maxV := values[0]
for _, v := range values[1:] {
if v > maxV {
maxV = v
continue // no effect
}
}
return maxV
}
func if_max_lol(values []int) int {
maxV := values[0]
for _, v := range values[1:] {
if v > maxV {
maxV = v
continue // turns this into a branch loop
}
print("lol")
}
return maxV
}
func cheat_max(values []int) int {
maxV := values[0]
for _, v := range values[1:] {
maxV = v
}
return maxV
}
var Sink int
func BenchmarkFn(b *testing.B) {
benchData := []struct {
name string
fn func([]int) int
}{
//{name: "if_max", fn: if_max},
{name: "if_max_lol", fn: if_max_lol},
{name: "cheat_max", fn: cheat_max},
}
// generate a large slice of increasing values
values := make([]int, 1e5)
for i := range values {
values[i] = i
}
b.ResetTimer()
for _, bench := range benchData {
b.Run("name="+bench.name, func(b *testing.B) {
for i := 0; i < b.N; i++ {
Sink = bench.fn(values)
}
})
}
}