_mm_abs_pi8
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 64-bit parameter.
__m64 _mm_abs_pi8(
__m64 a
);
Parameters
- [in] a
A 64-bit parameter that contains eight 8-bit signed integers for which the absolute values will be returned.
Return value
r0 := (a0 < 0) ? -a0 : a0
r1 := (a1 < 0) ? -a1 : a1
...
r7 := (a7 < 0) ? -a7 : a7
Requirements
Intrinsic |
Architecture |
|---|---|
_mm_abs_pi8 |
x86, x64 |
Header file <tmmintrin.h>
Remarks
The return value r and parameter a each consist of 64 bits. r0-r7, a0-a7 are the sequentially ordered 8-bit components of these parameters, where r0 and a0 indicate the least significant 8 bits.
Before using this intrinsic, software must ensure that the processor supports the instruction.
Example
#include <stdio.h>
#include <tmmintrin.h>
int main ()
{
__m64 a;
a.m64_i8[0] = 0;
a.m64_i8[1] = 0;
a.m64_i8[2] = 2;
a.m64_i8[3] = -2;
a.m64_i8[4] = 15;
a.m64_i8[5] = -15;
a.m64_i8[6] = 127;
a.m64_i8[7] = -127;
__m64 b = _mm_abs_pi8( a );
printf_s("Original 8 bit pairs:\n%4d, %4d\n%4d, %4d\n%4d, %4d\n%4d, %4d\n\n",
a.m64_i8[0], a.m64_i8[1], a.m64_i8[2], a.m64_i8[3],
a.m64_i8[4], a.m64_i8[5], a.m64_i8[6], a.m64_i8[7]);
printf_s("New 8 bit pairs:\n%4d, %4d\n%4d, %4d\n%4d, %4d\n%4d, %4d\n",
b.m64_i8[0], b.m64_i8[1], b.m64_i8[2], b.m64_i8[3],
b.m64_i8[4], b.m64_i8[5], b.m64_i8[6], b.m64_i8[7]);
_mm_empty();
return 0;
}
Original 8 bit pairs:
0, 0
2, -2
15, -15
127, -127
New 8 bit pairs:
0, 0
2, 2
15, 15
127, 127