quad.h 3.8 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. * @(#)quad.h 8.1 (Berkeley) 6/4/93
  36. * $FreeBSD$
  37. */
  38. /*
  39. * Quad arithmetic.
  40. *
  41. * This library makes the following assumptions:
  42. *
  43. * - The type long long (aka quad_t) exists.
  44. *
  45. * - A quad variable is exactly twice as long as `long'.
  46. *
  47. * - The machine's arithmetic is two's complement.
  48. *
  49. * This library can provide 128-bit arithmetic on a machine with 128-bit
  50. * quads and 64-bit longs, for instance, or 96-bit arithmetic on machines
  51. * with 48-bit longs.
  52. */
  53. #include <sys/types.h>
  54. #include <limits.h>
  55. /*
  56. * Depending on the desired operation, we view a `long long' (aka quad_t) in
  57. * one or more of the following formats.
  58. */
  59. union uu {
  60. quad_t q; /* as a (signed) quad */
  61. quad_t uq; /* as an unsigned quad */
  62. long sl[2]; /* as two signed longs */
  63. u_long ul[2]; /* as two unsigned longs */
  64. };
  65. /*
  66. * Define high and low longwords.
  67. */
  68. #define H _QUAD_HIGHWORD
  69. #define L _QUAD_LOWWORD
  70. /*
  71. * Total number of bits in a quad_t and in the pieces that make it up.
  72. * These are used for shifting, and also below for halfword extraction
  73. * and assembly.
  74. */
  75. #define QUAD_BITS (sizeof(quad_t) * CHAR_BIT)
  76. #define LONG_BITS (sizeof(long) * CHAR_BIT)
  77. #define HALF_BITS (sizeof(long) * CHAR_BIT / 2)
  78. /*
  79. * Extract high and low shortwords from longword, and move low shortword of
  80. * longword to upper half of long, i.e., produce the upper longword of
  81. * ((quad_t)(x) << (number_of_bits_in_long/2)). (`x' must actually be u_long.)
  82. *
  83. * These are used in the multiply code, to split a longword into upper
  84. * and lower halves, and to reassemble a product as a quad_t, shifted left
  85. * (sizeof(long)*CHAR_BIT/2).
  86. */
  87. #define HHALF(x) ((x) >> HALF_BITS)
  88. #define LHALF(x) ((x) & ((1L << HALF_BITS) - 1))
  89. #define LHUP(x) ((x) << HALF_BITS)
  90. int __cmpdi2(quad_t a, quad_t b);
  91. quad_t __divdi3(quad_t a, quad_t b);
  92. quad_t __moddi3(quad_t a, quad_t b);
  93. u_quad_t __qdivrem(u_quad_t u, u_quad_t v, u_quad_t *rem);
  94. int __ucmpdi2(u_quad_t a, u_quad_t b);
  95. u_quad_t __udivdi3(u_quad_t a, u_quad_t b);
  96. u_quad_t __umoddi3(u_quad_t a, u_quad_t b);
  97. typedef unsigned int qshift_t;