Microsoft Specific

Emits the Streaming SIMD Extensions 4 (SSE4) instruction pmovzxwd. This instruction performs a conversion of unsigned integers from 16-bit to 32-bit.

__m128i _mm_cvtepu16_epi32( 
   __m128i a


  • [in] a
    A 128-bit parameter that contains four unsigned 16-bit integers in the lower 64 bits.

Return value

A 128-bit parameter that contains four 32-bit integers. These integers are zero-extended representations of the 16-bit integers that are supplied by a.

The result can be defined with the following equations:

r0 := a0
r1 := 0

r2 := a1
r3 := 0

r4 := a2
r5 := 0

r6 := a3
r7 := 0





x86, x64

Header file <smmintrin.h>


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.


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

int main ()
    __m128i a;

    a.m128i_u16[0] = 0;
    a.m128i_u16[1] = 65535;
    a.m128i_u16[2] = 17500;
    a.m128i_u16[3] = 4096;

    __m128i res = _mm_cvtepu16_epi32(a);

    printf_s("Original lowest 16 bit integers:\n%u,\t%u\n%u,\t%u\n\n",
        a.m128i_u16[3], a.m128i_u16[2], a.m128i_u16[1], a.m128i_u16[0]);

    printf_s("Resulting 32 bit integers:\n%i,\t%i\n%i,\t%i\n",
        res.m128i_i32[3], res.m128i_i32[2], res.m128i_i32[1], res.m128i_i32[0]);

    return 0;
Original lowest 16 bit integers:
4096,   17500
65535,  0

Resulting 32 bit integers:
4096,   17500
65535,  0

See Also


Compiler Intrinsics