_mm_cvtepi16_epi64
Microsoft Specific
Emits the Streaming SIMD Extensions 4 (SSE4) instruction pmovsxwq. This instruction performs a conversion of signed integers from 16-bit to 64-bit.
__m128i _mm_cvtepi16_epi64(
__m128i a
);
Parameters
- [in] a
A 128-bit parameter that contains two signed 16-bit integers in the lower 32 bits.
Return value
A 128-bit parameter that contains two 64-bit integers. These integers are sign-extended representations of the 16-bit integers that are supplied by a.
Requirements
Intrinsic |
Architecture |
|---|---|
_mm_cvtepi16_epi64 |
x86, x64 |
Header file <smmintrin.h>
Remarks
The result is defined as follows:
r0 := a0
r1 := (a0 < 0) ? 0xffff : 0
r2 := (a0 < 0) ? 0xffff : 0
r3 := (a0 < 0) ? 0xffff : 0
r4 := a1
r5 := (a1 < 0) ? 0xffff : 0
r6 := (a1 < 0) ? 0xffff : 0
r7 := (a1 < 0) ? 0xffff : 0
r0-r7 and a0-a7 are the sequentially ordered 16-bit components of return value r and parameter a, respectively. r0 and a0 are the least significant 16 bits.
Before you use this intrinsic, software must ensure that the processor supports the instruction.
Example
#include <stdio.h>
#include <smmintrin.h>
int main ()
{
__m128i a;
a.m128i_i32[0] = 32767;
a.m128i_i16[1] = -32768;
__m128i res = _mm_cvtepi16_epi64(a);
printf_s("Original lowest 16 bit integers:\n%i,\t%i\n\n",
a.m128i_i16[1], a.m128i_i16[0]);
printf_s("Resulting 64 bit integers:\n%I64i,\t%I64i\n",
res.m128i_i64[1], res.m128i_i64[0]);
return 0;
}
Original lowest 16 bit integers:
-32768, 32767
Resulting 64 bit integers:
-32768, 32767