github.com/gocuntian/go@v0.0.0-20160610041250-fee02d270bf8/src/runtime/internal/sys/intrinsics_test.go (about)

     1  package sys_test
     2  
     3  import (
     4  	"runtime/internal/sys"
     5  	"testing"
     6  )
     7  
     8  func TestCtz64(t *testing.T) {
     9  	for i := uint(0); i <= 64; i++ {
    10  		x := uint64(5) << i
    11  		if got := sys.Ctz64(x); got != uint64(i) {
    12  			t.Errorf("Ctz64(%d)=%d, want %d", x, got, i)
    13  		}
    14  	}
    15  }
    16  func TestCtz32(t *testing.T) {
    17  	for i := uint(0); i <= 32; i++ {
    18  		x := uint32(5) << i
    19  		if got := sys.Ctz32(x); got != uint32(i) {
    20  			t.Errorf("Ctz32(%d)=%d, want %d", x, got, i)
    21  		}
    22  	}
    23  }
    24  func TestCtz16(t *testing.T) {
    25  	for i := uint(0); i <= 16; i++ {
    26  		x := uint16(5) << i
    27  		if got := sys.Ctz16(x); got != uint16(i) {
    28  			t.Errorf("Ctz16(%d)=%d, want %d", x, got, i)
    29  		}
    30  	}
    31  }
    32  func TestCtz8(t *testing.T) {
    33  	for i := uint(0); i <= 8; i++ {
    34  		x := uint8(5) << i
    35  		if got := sys.Ctz8(x); got != uint8(i) {
    36  			t.Errorf("Ctz8(%d)=%d, want %d", x, got, i)
    37  		}
    38  	}
    39  }
    40  
    41  func TestBswap64(t *testing.T) {
    42  	x := uint64(0x1122334455667788)
    43  	y := sys.Bswap64(x)
    44  	if y != 0x8877665544332211 {
    45  		t.Errorf("Bswap(%x)=%x, want 0x8877665544332211", x, y)
    46  	}
    47  }
    48  func TestBswap32(t *testing.T) {
    49  	x := uint32(0x11223344)
    50  	y := sys.Bswap32(x)
    51  	if y != 0x44332211 {
    52  		t.Errorf("Bswap(%x)=%x, want 0x44332211", x, y)
    53  	}
    54  }