intrinsics_test.go

Documentation: runtime/internal/sys

     1  // Copyright 2016 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package sys_test
     6  
     7  import (
     8  	"runtime/internal/sys"
     9  	"testing"
    10  )
    11  
    12  func TestTrailingZeros64(t *testing.T) {
    13  	for i := 0; i <= 64; i++ {
    14  		x := uint64(5) << uint(i)
    15  		if got := sys.TrailingZeros64(x); got != i {
    16  			t.Errorf("TrailingZeros64(%d)=%d, want %d", x, got, i)
    17  		}
    18  	}
    19  }
    20  func TestTrailingZeros32(t *testing.T) {
    21  	for i := 0; i <= 32; i++ {
    22  		x := uint32(5) << uint(i)
    23  		if got := sys.TrailingZeros32(x); got != i {
    24  			t.Errorf("TrailingZeros32(%d)=%d, want %d", x, got, i)
    25  		}
    26  	}
    27  }
    28  
    29  func TestBswap64(t *testing.T) {
    30  	x := uint64(0x1122334455667788)
    31  	y := sys.Bswap64(x)
    32  	if y != 0x8877665544332211 {
    33  		t.Errorf("Bswap(%x)=%x, want 0x8877665544332211", x, y)
    34  	}
    35  }
    36  func TestBswap32(t *testing.T) {
    37  	x := uint32(0x11223344)
    38  	y := sys.Bswap32(x)
    39  	if y != 0x44332211 {
    40  		t.Errorf("Bswap(%x)=%x, want 0x44332211", x, y)
    41  	}
    42  }
    43
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