various "max" benchmarks in go

if_test.go

package main

import (
	"testing"
)

type bigStruct struct {
	a                  int
	ba1, ba2, ba3, ba4 [8192]byte
}

func cmp(a, b bigStruct, bee *testing.B) {
	for i := 0; i < bee.N; i++ {
		x := a
		if x.a > b.a {
			x = b
		}
		_ = &x
	}
}

func cmpl(a, b bigStruct, bee *testing.B) {
	for i := 0; i < bee.N; i++ {
		var x bigStruct
		if a.a > b.a {
			x = a
		} else {
			x = b
		}
		_ = &x
	}
}

func cmpp(a, b bigStruct, bee *testing.B) {
	for i := 0; i < bee.N; i++ {
		p := &a
		if a.a > b.a {
			p = &b
		}
		x := *p
		_ = &x
	}
}

func BenchmarkIfGreater(bee *testing.B) {
	var a, b bigStruct
	a.a = 3
	b.a = 7

	cmp(b, a, bee)
}

func BenchmarkIfLess(bee *testing.B) {
	var a, b bigStruct
	a.a = 3
	b.a = 7

	cmp(a, b, bee)
}

func BenchmarkLazyLess(bee *testing.B) {
	var a, b bigStruct
	a.a = 3
	b.a = 7

	cmpl(a, b, bee)
}

func BenchmarkLazyGreater(bee *testing.B) {
	var a, b bigStruct
	a.a = 3
	b.a = 7

	cmpl(b, a, bee)
}

func BenchmarkPtrLess(bee *testing.B) {
	var a, b bigStruct
	a.a = 3
	b.a = 7

	cmpp(a, b, bee)
}

func BenchmarkPtrGreater(bee *testing.B) {
	var a, b bigStruct
	a.a = 3
	b.a = 7

	cmpp(b, a, bee)
}