checkdiv2(x-1, y+1)
			checkdiv2(x+1, y+1)
		}
	}
}

func checkdiv2(x, y uint64) {
	checkdiv3(x, y)
	checkdiv3(^x, y)
	checkdiv3(x, ^y)
	checkdiv3(^x, ^y)
}

var ntest int64 = 0

func checkdiv3(x, y uint64) {
	ntest++
	if ntest&(ntest-1) == 0 && long {
		println(ntest, "...")
	}
	checkuint64(x, y)

    }

    def "default dirs"() {
        expect:
        checkDirs()
    }

    def "dynamic dirs"() {
        when:
        project.buildDir = project.file('mybuild')

        then:
        checkDirs()
    }

    private void checkDirs() {
        assert convention.docsDir == new File(project.buildDir, convention.docsDirName)

        buildFile """
            tasks.register("checkDir") {
                def file = file("tmp/gradle")
                doLast {
                    println file
                }
            }
        """
        settingsFile << "include 'tmp'"

        when:
        def subdir = file("tmp")
        subdir.mkdirs()
        executer.inDirectory(subdir)
        succeeds ':checkDir'

        then:

//
// CheckDir returns an error if it encounters an I/O error or if the returned
// [CheckedFiles] does not describe a valid module zip file (according to
// [CheckedFiles.Err]). The returned [CheckedFiles] is still populated when such
// an error is returned.
//
// Note that CheckDir will not open any files, so [CreateFromDir] may still fail
// when CheckDir is successful due to I/O errors.

		f.Close()
		t.errorf("%s: Open returned File type %T, not a fs.ReadDirFile", dir, f)
		return nil
	}
	return d
}

// checkDir checks the directory dir, which is expected to exist
// (it is either the root or was found in a directory listing with IsDir true).
func (t *fsTester) checkDir(dir string) {
	// Read entire directory.
	t.dirs = append(t.dirs, dir)
	d := t.openDir(dir)
	if d == nil {
		return
	}