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package ff
import (
"math/big"
"reflect"
"testing"
)
func Test_double(t *testing.T) {
type args struct {
a Element
}
tests := []struct {
name string
args args
wantB Element
}{
{"1", args{Element{1, 0, 0, 0}}, Element{2, 0, 0, 0}},
{"2^64", args{Element{0, 1, 0, 0}}, Element{0, 2, 0, 0}},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
if gotB := double(tt.args.a); !reflect.DeepEqual(gotB, tt.wantB) {
t.Errorf("double() = %v, want %v", gotB, tt.wantB)
}
})
}
}
func Test_double_random(t *testing.T) {
for i := 0; i < 100; i++ {
a := randomElement(i)
a[3] = a[3] & 0x7fffffffffffffff // clear last bit so garunteed it will fit in 256 bits
got := double(a)
want := BigIntToElement(new(big.Int).Lsh(ElementToBigInt(a), 1))
if got != want {
t.Errorf("/%d double(%v) = %v, want %v", i, a, got, want)
t.FailNow()
}
}
}
func Benchmark_double(b *testing.B) {
a := randomElement(1)
a[3] = a[3] & 0x7fffffffffffffff
b.ResetTimer()
for i := 0; i < b.N; i++ {
double(a)
}
}
func Benchmark_double_BI(b *testing.B) {
a := ElementToBigInt(randomElement(1))
z := new(big.Int)
b.ResetTimer()
for i := 0; i < b.N; i++ {
z.Lsh(a, 1)
}
}
func Benchmark_double_add(b *testing.B) {
a := randomElement(1)
b.ResetTimer()
for i := 0; i < b.N; i++ {
add(a, a)
}
}
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