__m64_popcnt
Microsoft Specific
Emits the IPF Population Count instruction (popcnt), which determines the number of set bits (bits with the value 1) in the input 64-bit value.
__m64 __m64_popcnt(
__m64 value
);
Parameters
- [in] value
An __m64 union whose set bits are to be counted.
Return Value
The number of set (1) bits in the input.
Requirements
Intrinsic |
Architecture |
|---|---|
__m64_popcnt |
IPF |
Header file <intrin.h>
Example
// __m64_popcnt.cpp
// processor: IPF
#include <stdio.h>
#include <intrin.h>
#pragma intrinsic(__m64_popcnt)
int main()
{
__m64 m, result;
m.m64_i64 = -1;
result = __m64_popcnt(m);
printf_s("Population Count of %d (0x%I64x): %I64u\n",
m.m64_i64, m.m64_i64, result.m64_i64);
m.m64_u64 = 0xaaaaaaaaaaaaaaaaI64;
result = __m64_popcnt(m);
printf_s("Population Count of %u (0x%I64x): %I64u\n",
m.m64_u64, m.m64_u64, result.m64_u64);
}
Population Count of -1 (0xffffffffffffffff): 64
Population Count of 2863311530 (0xaaaaaaaaaaaaaaaa): 32