_mm_abs_epi8
Microsoft Specific
Emits the Supplemental Streaming SIMD Extensions 3 (SSSE3) instruction pabsb. This instruction returns the absolute value for each packed 8-bit integer of the 128-bit parameter.
__m128i _mm_abs_epi8(
__m128i a
);
Parameters
- [in] a
A 128-bit parameter that contains sixteen 8-bit signed integers for which the absolute values will be returned.
Return value
r0 := (a0 < 0) ? -a0 : a0
r1 := (a1 < 0) ? -a1 : a1
...
r15 := (a15 < 0) ? -a15 : a15
Requirements
Intrinsic |
Architecture |
|---|---|
_mm_abs_epi8 |
x86, x64 |
Header file <tmmintrin.h>
Remarks
The return value r and parameter a each consist of 128 bits. r0-r15, a0-a15 are the sequentially ordered 8-bit components of these parameters, where r0, a0 indicate the least significant 8 bits.
Before using this intrinsic, software must ensure that the processor supports the instruction.
Example
#include <tmmintrin.h>
#include <stdio.h>
int main()
{
__m128i a;
a.m128i_i8[0] = 0;
a.m128i_i8[1] = 0;
a.m128i_i8[2] = 2;
a.m128i_i8[3] = -2;
a.m128i_i8[4] = 15;
a.m128i_i8[5] = -15;
a.m128i_i8[6] = 127;
a.m128i_i8[7] = -127;
a.m128i_i8[8] = 64;
a.m128i_i8[9] = -64;
a.m128i_i8[10] = 27;
a.m128i_i8[11] = -27;
a.m128i_i8[12] = 90;
a.m128i_i8[13] = -90;
a.m128i_i8[14] = 0;
a.m128i_i8[15] = 0;
__m128i b = _mm_abs_epi8( a );
printf_s("Original 8 bit pairs:\n%4d, %4d\n%4d, %4d\n%4d, %4d\n%4d, %4d\n",
a.m128i_i8[0], a.m128i_i8[1], a.m128i_i8[2], a.m128i_i8[3],
a.m128i_i8[4], a.m128i_i8[5], a.m128i_i8[6], a.m128i_i8[7]);
printf_s("%4d, %4d\n%4d, %4d\n%4d, %4d\n%4d, %4d\n\n",
a.m128i_i8[8], a.m128i_i8[9], a.m128i_i8[10], a.m128i_i8[11],
a.m128i_i8[12], a.m128i_i8[13], a.m128i_i8[14], a.m128i_i8[15]);
printf_s("New 8 bit pairs:\n%4d, %4d\n%4d, %4d\n%4d, %4d\n%4d, %4d\n",
b.m128i_i8[0], b.m128i_i8[1], b.m128i_i8[2], b.m128i_i8[3],
b.m128i_i8[4], b.m128i_i8[5], b.m128i_i8[6], b.m128i_i8[7]);
printf_s("%4d, %4d\n%4d, %4d\n%4d, %4d\n%4d, %4d\n",
b.m128i_i8[8], b.m128i_i8[9], b.m128i_i8[10], b.m128i_i8[11],
b.m128i_i8[12], b.m128i_i8[13], b.m128i_i8[14], b.m128i_i8[15]);
return 0;
}
Original 8 bit pairs:
0, 0
2, -2
15, -15
127, -127
64, -64
27, -27
90, -90
0, 0
New 8 bit pairs:
0, 0
2, 2
15, 15
127, 127
64, 64
27, 27
90, 90
0, 0