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_mm_abs_pi16

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 64-bit parameter.

__m64 _mm_abs_pi16( 
   __m64 a
);

[in] a

A 64-bit parameter that contains four 16-bit signed integers for which the absolute values will be returned.

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

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

r2 := (a2 < 0) ? -a2 : a2

r3 := (a3 < 0) ? -a3 : a3

Intrinsic

Architecture

_mm_abs_pi16

x86, x64

Header file <tmmintrin.h>

The return value r and parameter a each consist of 64 bits. r0-r3, a0-a3 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 <stdio.h>
#include <tmmintrin.h>

int main () {
    __m64 a;

    a.m64_i16[0] = 0;
    a.m64_i16[1] = 0;
    a.m64_i16[2] = 32767;
    a.m64_i16[3] = -32767;

    __m64 b = _mm_abs_pi16( a );

    printf_s("Original 16 bit pairs:\n%6d, %6d\n%6d, %6d\n\n",
                a.m64_i16[0], a.m64_i16[1], a.m64_i16[2], a.m64_i16[3]);

    printf_s("New 16 bit pairs:\n%6d, %6d\n%6d, %6d\n",
                b.m64_i16[0], b.m64_i16[1], b.m64_i16[2], b.m64_i16[3]);

    _mm_empty();

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

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