_mm_sign_epi16
Microsoft Specific
Emits the Supplemental Streaming SIMD Extensions 3 (SSSE3) instruction psignw. This instruction negates or clears 16-bit signed integers of a 128 bit parameter.
__m128i _mm_sign_epi16(
__m128i a,
__m128i b
);
Parameters
[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.
Return value
The return value can be expressed with the following equations.
r0 := (b0 < 0) ? -a0 : ((b0 == 0) ? 0 : a0)
r1 := (b1 < 0) ? -a1 : ((b1 == 0) ? 0 : a1)
...
r7 := (b7 < 0) ? -a7 : ((b7 == 0) ? 0 : a7)
Requirements
Intrinsic |
Architecture |
|---|---|
_mm_sign_epi16 |
x86, x64 |
Header file <tmmintrin.h>
Remarks
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 underlying processor supports the instruction.
Example
#include <stdio.h>
#include <tmmintrin.h>
int main ()
{
__m128i a, b;
a.m128i_i16[0] = 42;
a.m128i_i16[1] = -3141;
a.m128i_i16[2] = 128;
a.m128i_i16[3] = 32000;
a.m128i_i16[4] = -81;
a.m128i_i16[5] = -5421;
a.m128i_i16[6] = -999;
a.m128i_i16[7] = 25;
b.m128i_i16[0] = 1;
b.m128i_i16[1] = 0;
b.m128i_i16[2] = -1;
b.m128i_i16[3] = 512;
b.m128i_i16[4] = -32768;
b.m128i_i16[5] = 32000;
b.m128i_i16[6] = 0;
b.m128i_i16[7] = -12;
__m128i res = _mm_sign_epi16(a, b);
printf_s(" a\t b\t res\n%6d\t%6d\t%6d\n%6d\t%6d\t%6d\n",
a.m128i_i16[0], b.m128i_i16[0], res.m128i_i16[0],
a.m128i_i16[1], b.m128i_i16[1], res.m128i_i16[1]);
printf_s("%6d\t%6d\t%6d\n%6d\t%6d\t%6d\n%6d\t%6d\t%6d\n%6d\t%6d\t%6d\n",
a.m128i_i16[2], b.m128i_i16[2], res.m128i_i16[2],
a.m128i_i16[3], b.m128i_i16[3], res.m128i_i16[3],
a.m128i_i16[4], b.m128i_i16[4], res.m128i_i16[4],
a.m128i_i16[5], b.m128i_i16[5], res.m128i_i16[5]);
printf_s("%6d\t%6d\t%6d\n%6d\t%6d\t%6d\n",
a.m128i_i16[6], b.m128i_i16[6], res.m128i_i16[6],
a.m128i_i16[7], b.m128i_i16[7], res.m128i_i16[7]);
return 0;
}
a b res
42 1 42
-3141 0 0
128 -1 -128
32000 512 32000
-81 -32768 81
-5421 32000 -5421
-999 0 0
25 -12 -25