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Add shared ctz32, cto32, ctz64, cto64,

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ctpop8, ctpop16, ctpop32 and ctpop64 helpers.


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3465 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
j_mayer 2007-10-28 12:52:38 +00:00
parent 941db52871
commit b9ef45ffa8
1 changed files with 97 additions and 0 deletions
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97
host-utils.h
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@ -102,3 +102,100 @@ static always_inline int clo64(uint64_t val)
{
return clz64(~val);
}
static always_inline int ctz32 (uint32_t val)
{
int cnt;
cnt = 0;
if (!(val & 0x0000FFFFUL)) {
cnt += 16;
val >>= 16;
}
if (!(val & 0x000000FFUL)) {
cnt += 8;
val >>= 8;
}
if (!(val & 0x0000000FUL)) {
cnt += 4;
val >>= 4;
}
if (!(val & 0x00000003UL)) {
cnt += 2;
val >>= 2;
}
if (!(val & 0x00000001UL)) {
cnt++;
val >>= 1;
}
if (!(val & 0x00000001UL)) {
cnt++;
}
return cnt;
}
static always_inline int cto32 (uint32_t val)
{
return ctz32(~val);
}
static always_inline int ctz64 (uint64_t val)
{
int cnt;
cnt = 0;
if (!((uint32_t)val)) {
cnt += 32;
val >>= 32;
}
return cnt + ctz32(val);
}
static always_inline int cto64 (uint64_t val)
{
return ctz64(~val);
}
static always_inline int ctpop8 (uint8_t val)
{
val = (val & 0x55) + ((val >> 1) & 0x55);
val = (val & 0x33) + ((val >> 2) & 0x33);
val = (val & 0x0f) + ((val >> 4) & 0x0f);
return val;
}
static always_inline int ctpop16 (uint16_t val)
{
val = (val & 0x5555) + ((val >> 1) & 0x5555);
val = (val & 0x3333) + ((val >> 2) & 0x3333);
val = (val & 0x0f0f) + ((val >> 4) & 0x0f0f);
val = (val & 0x00ff) + ((val >> 8) & 0x00ff);
return val;
}
static always_inline int ctpop32 (uint32_t val)
{
val = (val & 0x55555555) + ((val >> 1) & 0x55555555);
val = (val & 0x33333333) + ((val >> 2) & 0x33333333);
val = (val & 0x0f0f0f0f) + ((val >> 4) & 0x0f0f0f0f);
val = (val & 0x00ff00ff) + ((val >> 8) & 0x00ff00ff);
val = (val & 0x0000ffff) + ((val >> 16) & 0x0000ffff);
return val;
}
static always_inline int ctpop64 (uint64_t val)
{
val = (val & 0x5555555555555555ULL) + ((val >> 1) & 0x5555555555555555ULL);
val = (val & 0x3333333333333333ULL) + ((val >> 2) & 0x3333333333333333ULL);
val = (val & 0x0f0f0f0f0f0f0f0fULL) + ((val >> 4) & 0x0f0f0f0f0f0f0f0fULL);
val = (val & 0x00ff00ff00ff00ffULL) + ((val >> 8) & 0x00ff00ff00ff00ffULL);
val = (val & 0x0000ffff0000ffffULL) + ((val >> 16) & 0x0000ffff0000ffffULL);
val = (val & 0x00000000ffffffffULL) + ((val >> 32) & 0x00000000ffffffffULL);
return val;
}