LXR qemu/include/qemu/int128.h

   1#ifndef INT128_H
   2#define INT128_H
   3
   4typedef struct Int128 Int128;
   5
   6struct Int128 {
   7    uint64_t lo;
   8    int64_t hi;
   9};
  10
  11static inline Int128 int128_make64(uint64_t a)
  12{
  13    return (Int128) { a, 0 };
  14}
  15
  16static inline uint64_t int128_get64(Int128 a)
  17{
  18    assert(!a.hi);
  19    return a.lo;
  20}
  21
  22static inline Int128 int128_zero(void)
  23{
  24    return int128_make64(0);
  25}
  26
  27static inline Int128 int128_one(void)
  28{
  29    return int128_make64(1);
  30}
  31
  32static inline Int128 int128_2_64(void)
  33{
  34    return (Int128) { 0, 1 };
  35}
  36
  37static inline Int128 int128_add(Int128 a, Int128 b)
  38{
  39    Int128 r = { a.lo + b.lo, a.hi + b.hi };
  40    r.hi += (r.lo < a.lo) || (r.lo < b.lo);
  41    return r;
  42}
  43
  44static inline Int128 int128_neg(Int128 a)
  45{
  46    a.lo = ~a.lo;
  47    a.hi = ~a.hi;
  48    return int128_add(a, int128_one());
  49}
  50
  51static inline Int128 int128_sub(Int128 a, Int128 b)
  52{
  53    return int128_add(a, int128_neg(b));
  54}
  55
  56static inline bool int128_nonneg(Int128 a)
  57{
  58    return a.hi >= 0;
  59}
  60
  61static inline bool int128_eq(Int128 a, Int128 b)
  62{
  63    return a.lo == b.lo && a.hi == b.hi;
  64}
  65
  66static inline bool int128_ne(Int128 a, Int128 b)
  67{
  68    return !int128_eq(a, b);
  69}
  70
  71static inline bool int128_ge(Int128 a, Int128 b)
  72{
  73    return int128_nonneg(int128_sub(a, b));
  74}
  75
  76static inline bool int128_lt(Int128 a, Int128 b)
  77{
  78    return !int128_ge(a, b);
  79}
  80
  81static inline bool int128_le(Int128 a, Int128 b)
  82{
  83    return int128_ge(b, a);
  84}
  85
  86static inline bool int128_gt(Int128 a, Int128 b)
  87{
  88    return !int128_le(a, b);
  89}
  90
  91static inline bool int128_nz(Int128 a)
  92{
  93    return a.lo || a.hi;
  94}
  95
  96static inline Int128 int128_min(Int128 a, Int128 b)
  97{
  98    return int128_le(a, b) ? a : b;
  99}
 100
 101static inline Int128 int128_max(Int128 a, Int128 b)
 102{
 103    return int128_ge(a, b) ? a : b;
 104}
 105
 106static inline void int128_addto(Int128 *a, Int128 b)
 107{
 108    *a = int128_add(*a, b);
 109}
 110
 111static inline void int128_subfrom(Int128 *a, Int128 b)
 112{
 113    *a = int128_sub(*a, b);
 114}
 115
 116#endif
 117