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_mm_max_epu16

Visual Studio 2008

Visual Studio 2010

Microsoft Specific

Emits the Streaming SIMD Extensions 4 (SSE4) instruction pmaxuw. This instruction chooses the larger value of the two parameters.

__m128i _mm_max_epu16( 
   __m128i a,
   __m128i b 
);

Parameters

[in] a: A 128-bit parameter that contains eight 16-bit unsigned integers.
[in] b: A 128-bit parameter that contains eight 16-bit unsigned integers.

Return value

A 128-bit parameter that can be defined with the following equations:

r0 := (a0 > b0) ? a0 : b0
r1 := (a1 > b1) ? a1 : b1
...
r7 := (a7 > b7) ? a7 : b7

Requirements

Intrinsic	Architecture
_mm_max_epu16	x86, x64

Header file <smmintrin.h>

Remarks

r0-r7, a0-a7, and b0-b7 are the sequentially ordered 16-bit components of return value r and parameters a and b. r0, a0, and b0 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, b;

    a.m128i_u16[0] = 65535;
    a.m128i_u16[1] = 128;
    a.m128i_u16[2] = 128;
    a.m128i_u16[3] = 128;
    a.m128i_u16[4] = 17;
    a.m128i_u16[5] = 39000;
    a.m128i_u16[6] = 40000;
    a.m128i_u16[7] = 0;

    b.m128i_u16[0] = 65534;
    b.m128i_u16[1] = 0;
    b.m128i_u16[2] = 128;
    b.m128i_u16[3] = 129;
    b.m128i_u16[4] = 5740;
    b.m128i_u16[5] = 1;
    b.m128i_u16[6] = 45000;
    b.m128i_u16[7] = 0;

    __m128i res = _mm_max_epu16(a, b);

    printf_s("    a\t    b\t  res\n%5d\t%5d\t%5d\n%5d\t%5d\t%5d\n",
                a.m128i_u16[0], b.m128i_u16[0], res.m128i_u16[0],
                a.m128i_u16[1], b.m128i_u16[1], res.m128i_u16[1]);
    printf_s("%5d\t%5d\t%5d\n%5d\t%5d\t%5d\n%5d\t%5d\t%5d\n%5d\t%5d\t%5d\n",
                a.m128i_u16[2], b.m128i_u16[2], res.m128i_u16[2],
                a.m128i_u16[3], b.m128i_u16[3], res.m128i_u16[3],
                a.m128i_u16[4], b.m128i_u16[4], res.m128i_u16[4],
                a.m128i_u16[5], b.m128i_u16[5], res.m128i_u16[5]);
    printf_s("%5d\t%5d\t%5d\n%5d\t%5d\t%5d\n",
                a.m128i_u16[6], b.m128i_u16[6], res.m128i_u16[6],
                a.m128i_u16[7], b.m128i_u16[7], res.m128i_u16[7]);

    return 0;
}

a b res 65535 65534 65535 128 0 128 128 128 128 128 129 129 17 5740 5740 39000 1 39000 40000 45000 45000 0 0 0

Reference

Compiler Intrinsics

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