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clz_test.go
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clz_test.go
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package fpc
import "testing"
func TestCountLeadingZeroes(t *testing.T) {
testcases := []struct {
in string
want uint64
}{
{
in: "11111111 00000000 00000000 00000000 00000000 00000000 00000000 00000000",
want: 0,
},
{
in: "00000000 00000000 00000000 00000000 00000000 00000000 00000000 11111111",
want: 7,
},
{
in: "00000000 00000000 00000000 00000000 00000000 00000000 00000000 10000000",
want: 7,
},
{
in: "00000001 00000000 00000000 00000000 00000000 00000000 00000000 00000000",
want: 0,
},
{
in: "00000000 00000000 00000000 11111111 00000000 00000000 00000000 00000000",
want: 3,
},
{
in: "11111111 00000000 00000000 00000000 00000000 00000000 00000000 10000000",
want: 0,
},
{
in: "00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000",
want: 8,
},
}
for i, tc := range testcases {
have := clzBytes(binstr2u64(tc.in))
if have != tc.want {
t.Errorf("clzBytes test=%d have=%d want=%d", i, have, tc.want)
}
}
}