_mm_hadd_epi16
Microsoft Specific
Emits the Supplemental Streaming SIMD Extensions 3 (SSSE3) instruction phaddw. This instruction adds the elements of two 128-bit parameters.
__m128i _mm_hadd_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 contains eight 16-bit signed integers.
Return value
A 128-bit value that contains eight 16-bit signed integers. Each integer is the sum between adjacent pairs of elements in the input parameters.
The result can be expressed with the following equations:
r0 := a0 + a1
r1 := a2 + a3
r2 := a4 + a5
r3 := a6 + a7
r4 := b0 + b1
r5 := b2 + b3
r6 := b4 + b5
r7 := b6 + b7
Requirements
Intrinsic |
Architecture |
|---|---|
_mm_hadd_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] = -1;
a.m128i_i16[1] = 1;
a.m128i_i16[2] = 0;
a.m128i_i16[3] = 8;
a.m128i_i16[4] = -8;
a.m128i_i16[5] = 0;
a.m128i_i16[6] = 2;
a.m128i_i16[7] = 2;
b.m128i_i16[0] = -2;
b.m128i_i16[1] = -2;
b.m128i_i16[2] = 1000;
b.m128i_i16[3] = 2000;
b.m128i_i16[4] = 128;
b.m128i_i16[5] = 32;
b.m128i_i16[6] = 81;
b.m128i_i16[7] = -21;
__m128i res = _mm_hadd_epi16(a, b);
printf_s("Original a: \t%d\t%d\t%d\t%d\n\t\t%d\t%d\t%d\t%d\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("Original b: \t%d\t%d\t%d\t%d\n\t\t%d\t%d\t%d\t%d\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]);
printf_s("Result res: \t%d\t%d\t%d\t%d\n\t\t%d\t%d\t%d\t%d\n",
res.m128i_i16[0], res.m128i_i16[1], res.m128i_i16[2], res.m128i_i16[3],
res.m128i_i16[4], res.m128i_i16[5], res.m128i_i16[6], res.m128i_i16[7]);
return 0;
}
Original a: -1 1 0 8
-8 0 2 2
Original b: -2 -2 1000 2000
128 32 81 -21
Result res: 0 8 -8 4
-4 3000 160 60