Microsoft Specific
Emits the Streaming SIMD Extensions 4 (SSE4) instruction pcmpeqq.This instruction compares packed 64-bit integer values for equality.
__m128i _mm_cmpeq_epi64(
__m128i a,
__m128i b
);
Parameters
[in] a
A 128-bit parameter that contains two 64-bit integers.[in] b
A 128-bit parameter that contains two 64-bit integers.
Return value
r0 := (a0 == b0) ? 0xffffffffffffffff : 0
r1 := (a1 == b1) ? 0xffffffffffffffff : 0
Requirements
Intrinsic |
Architecture |
|---|---|
_mm_cmpeq_epi64 |
x86, x64 |
Header file <smmintrin.h>
Remarks
r0, a0, and b0 are the low order 64 bits of return value r and parameters a and b.
r1, a1, and b1 are the high order 64 bits of return value r and parameters a and b.
Before using this intrinsic, software must ensure that the processor supports the instruction.
Example
#include <stdio.h>
#include <smmintrin.h>
int main () {
__m128i a, b;
a.m128i_i64[1] = 0xFFFFFFFFFFFFFFFF;
a.m128i_i64[0] = 0xA0A0A0A0A0A0A0A0;
b.m128i_i64[1] = 0xFFFFFFFFFFFFFFFF;
b.m128i_i64[0] = 0xA0A0A0A0A0A0A0A1;
__m128i res = _mm_cmpeq_epi64( a, b );
printf_s("Original a: 0x%016I64x 0x%016I64x\nOriginal b: 0x%016I64x 0x%016I64x\n",
a.m128i_i64[1], a.m128i_i64[0], b.m128i_i64[1], b.m128i_i64[0]);
printf_s("Result res: 0x%016I64x 0x%016I64x\n",
res.m128i_i64[1], res.m128i_i64[0]);
return 0;
}
Original a: 0xffffffffffffffff 0xa0a0a0a0a0a0a0a0 Original b: 0xffffffffffffffff 0xa0a0a0a0a0a0a0a1 Result res: 0xffffffffffffffff 0x0000000000000000