host-utils.h

   1 /*
   2  * Utility compute operations used by translated code.
   3  *
   4  * Copyright (c) 2007 Thiemo Seufer
   5  * Copyright (c) 2007 Jocelyn Mayer
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a copy
   8  * of this software and associated documentation files (the "Software"), to deal
   9  * in the Software without restriction, including without limitation the rights
  10  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  11  * copies of the Software, and to permit persons to whom the Software is
  12  * furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included in
  15  * all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  23  * THE SOFTWARE.
  24  */
  25 #ifndef HOST_UTILS_H
  26 #define HOST_UTILS_H 1
  27
  28 #include "compiler.h"   /* QEMU_GNUC_PREREQ */
  29
  30 #if defined(__x86_64__)
  31 #define __HAVE_FAST_MULU64__
  32 static inline void mulu64(uint64_t *plow, uint64_t *phigh,
  33                           uint64_t a, uint64_t b)
  34 {
  35     __asm__ ("mul %0\n\t"
  36              : "=d" (*phigh), "=a" (*plow)
  37              : "a" (a), "0" (b));
  38 }
  39 #define __HAVE_FAST_MULS64__
  40 static inline void muls64(uint64_t *plow, uint64_t *phigh,
  41                           int64_t a, int64_t b)
  42 {
  43     __asm__ ("imul %0\n\t"
  44              : "=d" (*phigh), "=a" (*plow)
  45              : "a" (a), "0" (b));
  46 }
  47 #else
  48 void muls64(uint64_t *phigh, uint64_t *plow, int64_t a, int64_t b);
  49 void mulu64(uint64_t *phigh, uint64_t *plow, uint64_t a, uint64_t b);
  50 #endif
  51
  52 /* Binary search for leading zeros.  */
  53
  54 static inline int clz32(uint32_t val)
  55 {
  56 #if QEMU_GNUC_PREREQ(3, 4)
  57     if (val)
  58         return __builtin_clz(val);
  59     else
  60         return 32;
  61 #else
  62     int cnt = 0;
  63
  64     if (!(val & 0xFFFF0000U)) {
  65         cnt += 16;
  66         val <<= 16;
  67     }
  68     if (!(val & 0xFF000000U)) {
  69         cnt += 8;
  70         val <<= 8;
  71     }
  72     if (!(val & 0xF0000000U)) {
  73         cnt += 4;
  74         val <<= 4;
  75     }
  76     if (!(val & 0xC0000000U)) {
  77         cnt += 2;
  78         val <<= 2;
  79     }
  80     if (!(val & 0x80000000U)) {
  81         cnt++;
  82         val <<= 1;
  83     }
  84     if (!(val & 0x80000000U)) {
  85         cnt++;
  86     }
  87     return cnt;
  88 #endif
  89 }
  90
  91 static inline int clo32(uint32_t val)
  92 {
  93     return clz32(~val);
  94 }
  95
  96 static inline int clz64(uint64_t val)
  97 {
  98 #if QEMU_GNUC_PREREQ(3, 4)
  99     if (val)
 100         return __builtin_clzll(val);
 101     else
 102         return 64;
 103 #else
 104     int cnt = 0;
 105
 106     if (!(val >> 32)) {
 107         cnt += 32;
 108     } else {
 109         val >>= 32;
 110     }
 111
 112     return cnt + clz32(val);
 113 #endif
 114 }
 115
 116 static inline int clo64(uint64_t val)
 117 {
 118     return clz64(~val);
 119 }
 120
 121 static inline int ctz32(uint32_t val)
 122 {
 123 #if QEMU_GNUC_PREREQ(3, 4)
 124     if (val)
 125         return __builtin_ctz(val);
 126     else
 127         return 32;
 128 #else
 129     int cnt;
 130
 131     cnt = 0;
 132     if (!(val & 0x0000FFFFUL)) {
 133         cnt += 16;
 134         val >>= 16;
 135     }
 136     if (!(val & 0x000000FFUL)) {
 137         cnt += 8;
 138         val >>= 8;
 139     }
 140     if (!(val & 0x0000000FUL)) {
 141         cnt += 4;
 142         val >>= 4;
 143     }
 144     if (!(val & 0x00000003UL)) {
 145         cnt += 2;
 146         val >>= 2;
 147     }
 148     if (!(val & 0x00000001UL)) {
 149         cnt++;
 150         val >>= 1;
 151     }
 152     if (!(val & 0x00000001UL)) {
 153         cnt++;
 154     }
 155
 156     return cnt;
 157 #endif
 158 }
 159
 160 static inline int cto32(uint32_t val)
 161 {
 162     return ctz32(~val);
 163 }
 164
 165 static inline int ctz64(uint64_t val)
 166 {
 167 #if QEMU_GNUC_PREREQ(3, 4)
 168     if (val)
 169         return __builtin_ctzll(val);
 170     else
 171         return 64;
 172 #else
 173     int cnt;
 174
 175     cnt = 0;
 176     if (!((uint32_t)val)) {
 177         cnt += 32;
 178         val >>= 32;
 179     }
 180
 181     return cnt + ctz32(val);
 182 #endif
 183 }
 184
 185 static inline int cto64(uint64_t val)
 186 {
 187     return ctz64(~val);
 188 }
 189
 190 static inline int ctpop8(uint8_t val)
 191 {
 192     val = (val & 0x55) + ((val >> 1) & 0x55);
 193     val = (val & 0x33) + ((val >> 2) & 0x33);
 194     val = (val & 0x0f) + ((val >> 4) & 0x0f);
 195
 196     return val;
 197 }
 198
 199 static inline int ctpop16(uint16_t val)
 200 {
 201     val = (val & 0x5555) + ((val >> 1) & 0x5555);
 202     val = (val & 0x3333) + ((val >> 2) & 0x3333);
 203     val = (val & 0x0f0f) + ((val >> 4) & 0x0f0f);
 204     val = (val & 0x00ff) + ((val >> 8) & 0x00ff);
 205
 206     return val;
 207 }
 208
 209 static inline int ctpop32(uint32_t val)
 210 {
 211 #if QEMU_GNUC_PREREQ(3, 4)
 212     return __builtin_popcount(val);
 213 #else
 214     val = (val & 0x55555555) + ((val >>  1) & 0x55555555);
 215     val = (val & 0x33333333) + ((val >>  2) & 0x33333333);
 216     val = (val & 0x0f0f0f0f) + ((val >>  4) & 0x0f0f0f0f);
 217     val = (val & 0x00ff00ff) + ((val >>  8) & 0x00ff00ff);
 218     val = (val & 0x0000ffff) + ((val >> 16) & 0x0000ffff);
 219
 220     return val;
 221 #endif
 222 }
 223
 224 static inline int ctpop64(uint64_t val)
 225 {
 226 #if QEMU_GNUC_PREREQ(3, 4)
 227     return __builtin_popcountll(val);
 228 #else
 229     val = (val & 0x5555555555555555ULL) + ((val >>  1) & 0x5555555555555555ULL);
 230     val = (val & 0x3333333333333333ULL) + ((val >>  2) & 0x3333333333333333ULL);
 231     val = (val & 0x0f0f0f0f0f0f0f0fULL) + ((val >>  4) & 0x0f0f0f0f0f0f0f0fULL);
 232     val = (val & 0x00ff00ff00ff00ffULL) + ((val >>  8) & 0x00ff00ff00ff00ffULL);
 233     val = (val & 0x0000ffff0000ffffULL) + ((val >> 16) & 0x0000ffff0000ffffULL);
 234     val = (val & 0x00000000ffffffffULL) + ((val >> 32) & 0x00000000ffffffffULL);
 235
 236     return val;
 237 #endif
 238 }
 239
 240 #endif