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_mm_hsub_epi32

Microsoft Specific

Emits the Supplemental Streaming SIMD Extensions 3 (SSSE3) instruction phsubd. This instruction computes the difference between the elements of two 128-bit parameters.


__m128i _mm_hsub_epi32( 
   __m128i a,
   __m128i b
);

[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.

A 128-bit parameter that contains four 32-bit signed integers. Each integer is the difference between adjacent pairs of elements in the input parameters.

The result can be expressed with the following equations:

r0 := a0 - a1
r1 := a2 - a3
r2 := b0 - b1
r3 := b2 - b3

Intrinsic

Architecture

_mm_hsub_epi32

x86, x64

Header file <tmmintrin.h>

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 denote the least significant 32 bits.

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

#include <stdio.h>
#include <tmmintrin.h>

int main ()
{
    __m128i a, b;

    a.m128i_i32[0] = 32;
    a.m128i_i32[1] = 32;
    a.m128i_i32[2] = 4096;
    a.m128i_i32[3] = -4096;
    b.m128i_i32[0] = 65535;
    b.m128i_i32[1] = 32000;
    b.m128i_i32[2] = -16;
    b.m128i_i32[3] = 512;

    __m128i res = _mm_hsub_epi32(a, b);

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

    return 0;
}
Original a:         32      32    4096   -4096
Original b:      65535   32000     -16     512
Result res:          0    8192   33535    -528

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