gwj / at91sam9263 · Commits

Commit b9ef45ffa8df1b63b8d126910f62541fa355155e

Authored by j_mayer
1 parent 941db528

Add shared ctz32, cto32, ctz64, cto64, 

ctpop8, ctpop16, ctpop32 and ctpop64 helpers.


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3465 c046a42c-6fe2-441c-8c8c-71466251a162
Inline Side-by-side
Showing 1 changed file with 97 additions and 0 deletions
host-utils.h
  View file @b9ef45f
... ... @@ -102,3 +102,100 @@ static always_inline int clo64(uint64_t val)
102 102 {
103 103 return clz64(~val);
104 104 }
  105 +
  106 +static always_inline int ctz32 (uint32_t val)
  107 +{
  108 + int cnt;
  109 +
  110 + cnt = 0;
  111 + if (!(val & 0x0000FFFFUL)) {
  112 + cnt += 16;
  113 + val >>= 16;
  114 + }
  115 + if (!(val & 0x000000FFUL)) {
  116 + cnt += 8;
  117 + val >>= 8;
  118 + }
  119 + if (!(val & 0x0000000FUL)) {
  120 + cnt += 4;
  121 + val >>= 4;
  122 + }
  123 + if (!(val & 0x00000003UL)) {
  124 + cnt += 2;
  125 + val >>= 2;
  126 + }
  127 + if (!(val & 0x00000001UL)) {
  128 + cnt++;
  129 + val >>= 1;
  130 + }
  131 + if (!(val & 0x00000001UL)) {
  132 + cnt++;
  133 + }
  134 +
  135 + return cnt;
  136 + }
  137 +
  138 +static always_inline int cto32 (uint32_t val)
  139 + {
  140 + return ctz32(~val);
  141 +}
  142 +
  143 +static always_inline int ctz64 (uint64_t val)
  144 +{
  145 + int cnt;
  146 +
  147 + cnt = 0;
  148 + if (!((uint32_t)val)) {
  149 + cnt += 32;
  150 + val >>= 32;
  151 + }
  152 +
  153 + return cnt + ctz32(val);
  154 +}
  155 +
  156 +static always_inline int cto64 (uint64_t val)
  157 +{
  158 + return ctz64(~val);
  159 +}
  160 +
  161 +static always_inline int ctpop8 (uint8_t val)
  162 +{
  163 + val = (val & 0x55) + ((val >> 1) & 0x55);
  164 + val = (val & 0x33) + ((val >> 2) & 0x33);
  165 + val = (val & 0x0f) + ((val >> 4) & 0x0f);
  166 +
  167 + return val;
  168 +}
  169 +
  170 +static always_inline int ctpop16 (uint16_t val)
  171 +{
  172 + val = (val & 0x5555) + ((val >> 1) & 0x5555);
  173 + val = (val & 0x3333) + ((val >> 2) & 0x3333);
  174 + val = (val & 0x0f0f) + ((val >> 4) & 0x0f0f);
  175 + val = (val & 0x00ff) + ((val >> 8) & 0x00ff);
  176 +
  177 + return val;
  178 +}
  179 +
  180 +static always_inline int ctpop32 (uint32_t val)
  181 +{
  182 + val = (val & 0x55555555) + ((val >> 1) & 0x55555555);
  183 + val = (val & 0x33333333) + ((val >> 2) & 0x33333333);
  184 + val = (val & 0x0f0f0f0f) + ((val >> 4) & 0x0f0f0f0f);
  185 + val = (val & 0x00ff00ff) + ((val >> 8) & 0x00ff00ff);
  186 + val = (val & 0x0000ffff) + ((val >> 16) & 0x0000ffff);
  187 +
  188 + return val;
  189 +}
  190 +
  191 +static always_inline int ctpop64 (uint64_t val)
  192 +{
  193 + val = (val & 0x5555555555555555ULL) + ((val >> 1) & 0x5555555555555555ULL);
  194 + val = (val & 0x3333333333333333ULL) + ((val >> 2) & 0x3333333333333333ULL);
  195 + val = (val & 0x0f0f0f0f0f0f0f0fULL) + ((val >> 4) & 0x0f0f0f0f0f0f0f0fULL);
  196 + val = (val & 0x00ff00ff00ff00ffULL) + ((val >> 8) & 0x00ff00ff00ff00ffULL);
  197 + val = (val & 0x0000ffff0000ffffULL) + ((val >> 16) & 0x0000ffff0000ffffULL);
  198 + val = (val & 0x00000000ffffffffULL) + ((val >> 32) & 0x00000000ffffffffULL);
  199 +
  200 + return val;
  201 + }
... ...