/* Returns the number of 1-bits in 'x', between 0 and 32 inclusive. */
static unsigned int
-popcount32(uint32_t x)
+count_1bits_32(uint32_t x)
{
/* In my testing, this implementation is over twice as fast as any other
* portable implementation that I tried, including GCC 4.4
#define INIT32(X) INIT16(X), INIT16((X) + 16)
#define INIT64(X) INIT32(X), INIT32((X) + 32)
- static const uint8_t popcount8[256] = {
+ static const uint8_t count_1bits_8[256] = {
INIT64(0), INIT64(64), INIT64(128), INIT64(192)
};
- return (popcount8[x & 0xff] +
- popcount8[(x >> 8) & 0xff] +
- popcount8[(x >> 16) & 0xff] +
- popcount8[x >> 24]);
+ return (count_1bits_8[x & 0xff] +
+ count_1bits_8[(x >> 8) & 0xff] +
+ count_1bits_8[(x >> 16) & 0xff] +
+ count_1bits_8[x >> 24]);
}
/* Returns the number of 1-bits in 'x', between 0 and 64 inclusive. */
unsigned int
-popcount(uint64_t x)
+count_1bits(uint64_t x)
{
- return popcount32(x) + popcount32(x >> 32);
+ return count_1bits_32(x) + count_1bits_32(x >> 32);
}
/* Returns true if the 'n' bytes starting at 'p' are zeros. */