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Microsoft Specific
Emits the Streaming SIMD Extensions 2 (SSE2) instruction movq. This instruction extracts the low order 64-bit integer from the parameter.
__int64 _mm_cvtsi128_si64(
__m128i a
);
Parameters
- [in] a
A 128-bit parameter that contains a 64-signed integer in the lowest 64 bits.
Return value
The result can be expressed with the following equation:
r := a0
Requirements
Intrinsic |
Architecture |
|---|---|
_mm_cvtsi128_si64 |
x64 |
Header file <emmintrin.h>
Remarks
r is the 64-bit signed integer result.a0 is the lower 64 bits of parameter a. The upper 64 bits of parameter a are ignored.
Before you use this intrinsic, software must ensure that the processor supports the instruction.
Example
#include <stdio.h>
#include <emmintrin.h>
int main ()
{
__m128i a;
a.m128i_i64[0] = -65535;
a.m128i_i64[1] = 1;
__int64 res = _mm_cvtsi128_si64(a);
printf_s("Original a: %I64d\t%I64d\n", a.m128i_i64[1], a.m128i_i64[0]);
printf_s("Result res: %I64d\n", res);
return 0;
}
Original a: 1 -65535 Result res: -65535