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pattern_replace_test.go
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pattern_replace_test.go
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package il_test
import (
"runtime"
"testing"
)
// BenchmarkZeroPatternReplace tests the optimization benefits from
// from doing a zero pattern replacement.
func BenchmarkZeroPatternReplace(b *testing.B) {
var data = make([]byte, 10)
var datap int
b.Run("Without", func(b *testing.B) {
for i := 0; i < b.N; i++ {
data[datap] = 0xFF
for data[datap] != 0 {
data[datap]--
}
}
})
b.Run("With", func(b *testing.B) {
setdata := func(value byte) {
data[datap] = value
}
b.ResetTimer()
for i := 0; i < b.N; i++ {
data[datap] = 0xFF
runtime.KeepAlive(data[datap])
setdata(0)
}
})
b.Run("WithNoFunc", func(b *testing.B) {
for i := 0; i < b.N; i++ {
data[datap] = 0xFF
runtime.KeepAlive(data[datap])
data[datap] = 0
}
})
}
// BenchmarkAddPatternReplace tests the optimization benefits from
// from doing an add pattern replacement.
func BenchmarkAddPatternReplace(b *testing.B) {
var data = make([]byte, 10)
var datap int
b.Run("Without", func(b *testing.B) {
for i := 0; i < b.N; i++ {
datap = 0
data[datap] = 0xFF
data[datap+1] = 0xFF
datap++
for data[datap] != 0 {
data[datap]--
datap--
data[datap]++
datap++
}
datap--
}
})
b.Run("With", func(b *testing.B) {
for i := 0; i < b.N; i++ {
datap = 0
data[datap] = 0xFF
data[datap+1] = 0xFF
data[datap] += data[datap+1]
data[datap+1] = 0
}
})
}
// BenchmarkMultiplyPatternReplace tests the optimization benefits from
// from doing an multiply pattern replacement.
func BenchmarkMultiplyPatternReplace(b *testing.B) {
const multiplier byte = 94
var data = make([]byte, 10)
var datap int
b.Run("Without", func(b *testing.B) {
for i := 0; i < b.N; i++ {
datap = 0
data[datap] = 0xFF
data[datap+1] = 0xFF
datap++
for data[datap] != 0 {
data[datap]--
datap--
data[datap] += multiplier
datap++
}
datap--
}
})
b.Run("With", func(b *testing.B) {
for i := 0; i < b.N; i++ {
datap = 0
data[datap] = 0xFF
data[datap+1] = 0xFF
data[datap] += data[datap+1] * multiplier
data[datap+1] = 0
}
})
}
func TestDataSetIntOverflow(t *testing.T) {
var adder = 2386
var value1 byte = 0x12
var value2 byte = 0x12
// BF way of setting overflow value
for i := 0; i < adder; i++ {
value1++
}
// new way to multiply
value2 += byte(adder)
if value1 != value2 {
t.Fatalf("Values not equal: value1=%d and value2=%d", value1, value2)
}
}
func TestMultiplicativeAssociativity(t *testing.T) {
var multiplier byte = 45
var adder byte = 135
var value1 byte = 0x12
var value2 byte = 0x12
// BF way of multiplying
for i := byte(0); i < multiplier; i++ {
value1 += adder
}
// new way to multiply
value2 += adder * multiplier
if value1 != value2 {
t.Fatalf("Values not equal: value1=%d and value2=%d", value1, value2)
}
}
func TestMultilevelMultiplication(t *testing.T) {
var multiplier1 byte = 0xFF
var multiplier2 byte = 0xFE
var adder byte = 135
var value1 byte = 0x12
var value2 byte = 0x12
value1 += (adder * multiplier1)
value1 += (adder * multiplier2)
value2 += adder * (multiplier1 + multiplier2)
if value1 != value2 {
t.Fatalf("Values not equal: value1=%d and value2=%d", value1, value2)
}
}
func TestMultiplicativeDestruction(t *testing.T) {
var multiplier byte = 0xFF
var adder byte = 135
var value1 byte = 0x12
var value2 byte = 0x12
// BF way of multiplying
for i := byte(0); i < multiplier; i++ {
value1 += adder
}
// new way to multiply
value2 += adder * multiplier
if value1 != value2 {
t.Fatalf("Values not equal: value1=%d and value2=%d", value1, value2)
}
}