_mm_max_epi32

Microsoft Specific

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

__m128i _mm_max_epi32( 
   __m128i a,
   __m128i b 
);

Parameters

• [in] a
  A 128-bit parameter that contains four 32-bit signed integers.

• [in] b
  A 128-bit parameter that contains four 32-bit signed 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
r2 := (a2 > b2) ? a2 : b2
r3 := (a3 > b3) ? a3 : b3

Requirements

Header file <smmintrin.h>

Remarks

r0-r3, a0-a3, and b0-b3 are the sequentially ordered 32-bit components of return value r and parameters a and b. r0, a0, and b0 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, b;

    a.m128i_i32[0] = 0;
    a.m128i_i32[1] = 32000;
    a.m128i_i32[2] = -750;
    a.m128i_i32[3] = 2;

    b.m128i_i32[0] = -1000;
    b.m128i_i32[1] = -32000;
    b.m128i_i32[2] = -500;
    b.m128i_i32[3] = 1;

    __m128i res = _mm_max_epi32(a, b);

    printf_s("     a\t     b\t   res\n");
    printf_s("%6d\t%6d\t%6d\n%6d\t%6d\t%6d\n%6d\t%6d\t%6d\n%6d\t%6d\t%6d\n",
                a.m128i_i32[0], b.m128i_i32[0], res.m128i_i32[0],
                a.m128i_i32[1], b.m128i_i32[1], res.m128i_i32[1],
                a.m128i_i32[2], b.m128i_i32[2], res.m128i_i32[2],
                a.m128i_i32[3], b.m128i_i32[3], res.m128i_i32[3]);

    return 0;
}

     a       b     res
     0   -1000       0
 32000  -32000   32000
  -750    -500    -500
     2       1       2

See Also

Reference

Compiler Intrinsics