Microsoft Specific
Emits the Streaming SIMD Extensions 4 (SSE4) instruction pmovsxdq. This instruction performs a conversion of signed integers from 32-bit to 64-bit.
__m128i _mm_cvtepi32_epi64(
__m128i a
);
Parameters
- [in] a
A 128-bit parameter that contains two signed 32-bit integers in the lower 64 bits.
Return value
A 128-bit parameter that contains two 64-bit integers. These integers are sign-extended representations of the 32-bit integers that are supplied by a.
The result is defined as follows:
r0 := a0
r1 := (a0 < 0) ? 0xffffffff : 0
r2 := a1
r3 := (a1 < 0) ? 0xffffffff : 0
Requirements
Intrinsic |
Architecture |
|---|---|
_mm_cvtepi32_epi64 |
x86, x64 |
Header file <smmintrin.h>
Remarks
r0-r3 and a0-a3 are the sequentially ordered 32-bit components of return value r and parameter a, respectively. r0 and a0 are the least significant 32 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] = -2147483647;
a.m128i_i32[1] = 2147483647;
__m128i res = _mm_cvtepi32_epi64(a);
printf_s("Original lowest 32 bit integers:\n%i,\t%i\n\n",
a.m128i_i32[1], a.m128i_i32[0]);
printf_s("Resulting 64 bit integers:\n%I64i,\t%I64i\n",
res.m128i_i64[1], res.m128i_i64[0]);
return 0;
}
Original lowest 32 bit integers: 2147483647, -2147483647 Resulting 64 bit integers: 2147483647, -2147483647