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_mm_abs_epi16

Microsoft Specific

Emits the Supplemental Streaming SIMD Extensions 3 (SSSE3) instruction pabsw. This instruction returns the absolute value for each packed 16-bit integer of the 128-bit parameter.


__m128i _mm_abs_epi16( 
   __m128i a
);

[in] a

A 128-bit parameter that contains eight 16-bit signed integers for which the absolute values will be returned.

r0 := (a0 < 0) ? -a0 : a0

r1 := (a1 < 0) ? -a1 : a1

...

r7 := (a7 < 0) ? -a7 : a7

Intrinsic

Architecture

_mm_abs_epi16

x86, x64

Header file <tmmintrin.h>

The return value r and parameter a each consist of 128 bits. r0-r7, a0-a7 are the sequentially ordered 16-bit components of these parameters, where r0 and a0 indicate the least significant 16 bits.

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

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

    __m128i a;

int main()
{
    a.m128i_i16[0] = 0;
    a.m128i_i16[1] = 0;
    a.m128i_i16[2] = 128;
    a.m128i_i16[3] = -128;
    a.m128i_i16[4] = 32767;
    a.m128i_i16[5] = -32767;
    a.m128i_i16[6] = 8756;
    a.m128i_i16[7] = -8756;

    __m128i b = _mm_abs_epi16( a );

    printf_s("Original 16 bit pairs:\n%6d, %6d\n%6d, %6d\n%6d, %6d\n%6d, %6d\n\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("New 16 bit pairs:\n%6d, %6d\n%6d, %6d\n%6d, %6d\n%6d, %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]);

    return 0;
}
Original 16 bit pairs:
     0,      0
   128,   -128
 32767, -32767
  8756,  -8756

New 16 bit pairs:
     0,      0
   128,    128
 32767,  32767
  8756,   8756

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