1 package sys_test
2
3 import (
4 "runtime/internal/sys"
5 "testing"
6 )
7
8 func TestCtz64(t *testing.T) {
9 for i := 0; i <= 64; i++ {
10 x := uint64(5) << uint(i)
11 if got := sys.Ctz64(x); got != i {
12 t.Errorf("Ctz64(%d)=%d, want %d", x, got, i)
13 }
14 }
15 }
16 func TestCtz32(t *testing.T) {
17 for i := 0; i <= 32; i++ {
18 x := uint32(5) << uint(i)
19 if got := sys.Ctz32(x); got != i {
20 t.Errorf("Ctz32(%d)=%d, want %d", x, got, i)
21 }
22 }
23 }
24
25 func TestBswap64(t *testing.T) {
26 x := uint64(0x1122334455667788)
27 y := sys.Bswap64(x)
28 if y != 0x8877665544332211 {
29 t.Errorf("Bswap(%x)=%x, want 0x8877665544332211", x, y)
30 }
31 }
32 func TestBswap32(t *testing.T) {
33 x := uint32(0x11223344)
34 y := sys.Bswap32(x)
35 if y != 0x44332211 {
36 t.Errorf("Bswap(%x)=%x, want 0x44332211", x, y)
37 }
38 }
39
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