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_mm_hsub_epi16

Microsoft Specific

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

__m128i _mm_hsub_epi16( 
   __m128i a,
   __m128i b
);

[in] a

A 128-bit parameter that contains eight 16-bit signed integers.

[in] b

A 128-bit parameter that contains eight 16-bit signed integers.

A 128-bit value that contains eight 16-bit signed integers. Each integer is the difference between adjacent pairs input parameter elements.

The result can be expressed with the following equations:

r0 := a0 - a1
r1 := a2 - a3
r2 := a4 - a5
r3 := a6 - a7
r4 := b0 - b1
r5 := b2 - b3
r6 := b4 - b5
r7 := b6 - b7

Intrinsic

Architecture

_mm_hsub_epi16

x86, x64

Header file <tmmintrin.h>

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.

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

int main ()
{
    __m128i a, b;

    a.m128i_i16[0] = 1;
    a.m128i_i16[1] = 1;
    a.m128i_i16[2] = 100;
    a.m128i_i16[3] = -100;
    a.m128i_i16[4] = -1000;
    a.m128i_i16[5] = 1000;
    a.m128i_i16[6] = 100;
    a.m128i_i16[7] = 52;
    b.m128i_i16[0] = -128;
    b.m128i_i16[1] = -64;
    b.m128i_i16[2] = 32;
    b.m128i_i16[3] = 4096;
    b.m128i_i16[4] = 2;
    b.m128i_i16[5] = -2;
    b.m128i_i16[6] = 32000;
    b.m128i_i16[7] = 0;

    __m128i res = _mm_hsub_epi16(a, b);

    printf_s("Original a:\t%6d\t%6d\t%6d\t%6d\n\t\t%6d\t%6d\t%6d\t%6d\n",
                a.m128i_i16[0], a.m128i_i16[1], a.m128i_i16[2], a.m128i_i16[3],
                a.m128i_i16[4], a.m128i_i16[5], a.m128i_i16[6], a.m128i_i16[7]);
    printf_s("Original b:\t%6d\t%6d\t%6d\t%6d\n\t\t%6d\t%6d\t%6d\t%6d\n",
                b.m128i_i16[0], b.m128i_i16[1], b.m128i_i16[2], b.m128i_i16[3],
                b.m128i_i16[4], b.m128i_i16[5], b.m128i_i16[6], b.m128i_i16[7]);
    printf_s("Result res:\t%6d\t%6d\t%6d\t%6d\n\t\t%6d\t%6d\t%6d\t%6d\n",
                res.m128i_i16[0], res.m128i_i16[1], res.m128i_i16[2], res.m128i_i16[3],
                res.m128i_i16[4], res.m128i_i16[5], res.m128i_i16[6], res.m128i_i16[7]);

    return 0;
}
Original a:          1       1     100    -100
                 -1000    1000     100      52
Original b:       -128     -64      32    4096
                     2      -2   32000       0
Result res:          0     200   -2000      48
                   -64   -4064       4   32000

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