SYS_THRKILL        = 119 // { int sys_thrkill(pid_t tid, int signum, void *tcb); }
	SYS_READV          = 120 // { ssize_t sys_readv(int fd, \
	SYS_WRITEV         = 121 // { ssize_t sys_writev(int fd, \
	SYS_KILL           = 122 // { int sys_kill(int pid, int signum); }
	SYS_FCHOWN         = 123 // { int sys_fchown(int fd, uid_t uid, gid_t gid); }

    @Override
    double roundToDoubleArbitrarily(BigDecimal bigDecimal) {
      return bigDecimal.doubleValue();
    }

    @Override
    int sign(BigDecimal bigDecimal) {
      return bigDecimal.signum();
    }

    @Override
    BigDecimal toX(double d, RoundingMode mode) {
      return new BigDecimal(d);
    }

    @Override
    BigDecimal minus(BigDecimal a, BigDecimal b) {
      return a.subtract(b);

	// where g is not set.
	// first save R0, because runtime·load_g will clobber it
	MOVD	R0, 8(RSP)		// signum
	MOVB	runtime·iscgo(SB), R0
	CMP 	$0, R0
	// XXX branch destination
	BEQ	2(PC)
	BL	runtime·load_g(SB)

	// Restore signum to R0.
	MOVW	8(RSP), R0
	// R1 and R2 already contain info and ctx, respectively.
	BL	runtime·sigtrampgo<ABIInternal>(SB)

     * deal with the cases where rounding towards 0 is wrong, which typically depends on the sign of
     * p / q.
     *
     * signum is 1 if p and q are both nonnegative or both negative, and -1 otherwise.
     */
    int signum = 1 | ((p ^ q) >> (Integer.SIZE - 1));
    boolean increment;
    switch (mode) {
      case UNNECESSARY:
        checkRoundingUnnecessary(rem == 0);

	SYS_THRKILL        = 119 // { int sys_thrkill(pid_t tid, int signum, void *tcb); }
	SYS_READV          = 120 // { ssize_t sys_readv(int fd, const struct iovec *iovp, int iovcnt); }
	SYS_WRITEV         = 121 // { ssize_t sys_writev(int fd, const struct iovec *iovp, int iovcnt); }
	SYS_KILL           = 122 // { int sys_kill(int pid, int signum); }
	SYS_FCHOWN         = 123 // { int sys_fchown(int fd, uid_t uid, gid_t gid); }

	SYS_THRKILL        = 119 // { int sys_thrkill(pid_t tid, int signum, void *tcb); }
	SYS_READV          = 120 // { ssize_t sys_readv(int fd, const struct iovec *iovp, int iovcnt); }
	SYS_WRITEV         = 121 // { ssize_t sys_writev(int fd, const struct iovec *iovp, int iovcnt); }
	SYS_KILL           = 122 // { int sys_kill(int pid, int signum); }
	SYS_FCHOWN         = 123 // { int sys_fchown(int fd, uid_t uid, gid_t gid); }

	MOVW	tid+0(FP), R4		// arg 1 - tid
	MOVV	sig+8(FP), R5		// arg 2 - signum
	MOVW	$0, R6			// arg 3 - tcb
	MOVV	$119, R2		// sys_thrkill
	SYSCALL
	RET

TEXT runtime·raiseproc(SB),NOSPLIT,$0
	MOVV	$20, R4			// sys_getpid
	SYSCALL
	MOVV	R2, R4			// arg 1 - pid
	MOVW	sig+0(FP), R5		// arg 2 - signum
	MOVV	$122, R2		// sys_kill
	SYSCALL
	RET

TEXT runtime·mmap(SB),NOSPLIT,$0

	SYS_THRKILL        = 119 // { int sys_thrkill(pid_t tid, int signum, void *tcb); }
	SYS_READV          = 120 // { ssize_t sys_readv(int fd, \
	SYS_WRITEV         = 121 // { ssize_t sys_writev(int fd, \
	SYS_KILL           = 122 // { int sys_kill(int pid, int signum); }
	SYS_FCHOWN         = 123 // { int sys_fchown(int fd, uid_t uid, gid_t gid); }

	SYS_THRKILL        = 119 // { int sys_thrkill(pid_t tid, int signum, void *tcb); }
	SYS_READV          = 120 // { ssize_t sys_readv(int fd, \
	SYS_WRITEV         = 121 // { ssize_t sys_writev(int fd, \
	SYS_KILL           = 122 // { int sys_kill(int pid, int signum); }
	SYS_FCHOWN         = 123 // { int sys_fchown(int fd, uid_t uid, gid_t gid); }

    for (long a : UNSIGNED_INTS) {
      for (long b : UNSIGNED_INTS) {
        int cmpAsLongs = Longs.compare(a, b);
        int cmpAsUInt = UnsignedInts.compare((int) a, (int) b);
        assertThat(Integer.signum(cmpAsUInt)).isEqualTo(Integer.signum(cmpAsLongs));
      }
    }
  }

  public void testMax_noArgs() {
    try {
      UnsignedInts.max();
      fail();
    } catch (IllegalArgumentException expected) {
    }
  }