divdi3.c 2.3 KB

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  1. /*-
  2. * SPDX-License-Identifier: BSD-3-Clause
  3. *
  4. * Copyright (c) 1992, 1993
  5. * The Regents of the University of California. All rights reserved.
  6. *
  7. * This software was developed by the Computer Systems Engineering group
  8. * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
  9. * contributed to Berkeley.
  10. *
  11. * Redistribution and use in source and binary forms, with or without
  12. * modification, are permitted provided that the following conditions
  13. * are met:
  14. * 1. Redistributions of source code must retain the above copyright
  15. * notice, this list of conditions and the following disclaimer.
  16. * 2. Redistributions in binary form must reproduce the above copyright
  17. * notice, this list of conditions and the following disclaimer in the
  18. * documentation and/or other materials provided with the distribution.
  19. * 3. Neither the name of the University nor the names of its contributors
  20. * may be used to endorse or promote products derived from this software
  21. * without specific prior written permission.
  22. *
  23. * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24. * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25. * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26. * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27. * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28. * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29. * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30. * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31. * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32. * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33. * SUCH DAMAGE.
  34. */
  35. #if defined(LIBC_SCCS) && !defined(lint)
  36. static char sccsid[] = "@(#)divdi3.c 8.1 (Berkeley) 6/4/93";
  37. #endif /* LIBC_SCCS and not lint */
  38. #include <sys/cdefs.h>
  39. __FBSDID("$FreeBSD$");
  40. #include "quad.h"
  41. /*
  42. * Divide two signed quads.
  43. * ??? if -1/2 should produce -1 on this machine, this code is wrong
  44. */
  45. quad_t
  46. __divdi3(quad_t a, quad_t b)
  47. {
  48. u_quad_t ua, ub, uq;
  49. int neg;
  50. if (a < 0)
  51. ua = -(u_quad_t)a, neg = 1;
  52. else
  53. ua = a, neg = 0;
  54. if (b < 0)
  55. ub = -(u_quad_t)b, neg ^= 1;
  56. else
  57. ub = b;
  58. uq = __qdivrem(ua, ub, (u_quad_t *)0);
  59. return (neg ? -uq : uq);
  60. }