Microsoft Specific

Emits the Streaming SIMD Extensions 4 (SSE4) instruction pmovzxdq. This instruction performs a conversion of unsigned integers from 32-bit to 64-bit.

__m128i _mm_cvtepu32_epi64( 
   __m128i a


  • [in] a
    A 128-bit parameter that contains two unsigned 32-bit integers in the lower 64 bits.

Return value

A 128-bit parameter that contains two 64-bit integers. These integers are zero-extended representations of the 32-bit integers that are supplied by a.

The result can be defined with the following equations:

r0 = a0
r1 = 0
r2 = a1
r3 = 0





x86, x64

Header file <smmintrin.h>


r0-r3 and a0-a3 are the sequentially ordered 32-bit components of return value r and parameter a, respectively, where r0 and a0 are the least significant 32 bits.

Before you use this intrinsic, software must ensure that the processor supports the instruction.


#include <stdio.h>
#include <smmintrin.h>

int main ()
    __m128i a;

    a.m128i_u32[0] = 0;
    a.m128i_u32[1] = 4294967295;

    __m128i res = _mm_cvtepu32_epi64(a);

    printf_s("Original lowest 32 bit integers:\n%u,\t%u\n\n",
        a.m128i_u32[1], a.m128i_u32[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:
4294967295,     0

Resulting 64 bit integers:
4294967295,     0

See Also


Compiler Intrinsics