_mm_hadds_epi16
Microsoft Specific
Emits the Supplemental Streaming SIMD Extensions 3 (SSSE3) instruction phaddsw. This instruction adds the elements of two 128-bit parameters.
__m128i _mm_hadds_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
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 := SATURATE_16(a0 + a1)
r1 := SATURATE_16(a2 + a3)
r2 := SATURATE_16(a4 + a5)
r3 := SATURATE_16(a6 + a7)
r4 := SATURATE_16(b0 + b1)
r5 := SATURATE_16(b2 + b3)
r6 := SATURATE_16(b4 + b5)
r7 := SATURATE_16(b6 + b7)
Requirements
Intrinsic |
Architecture |
|---|---|
_mm_hadds_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.
SATURATE_16(x) is ((x > 32767) ? 32767 : ((x < -32768) ? -32768 : x))
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] = 2;
a.m128i_i16[2] = 0;
a.m128i_i16[3] = 128;
a.m128i_i16[4] = -32768;
a.m128i_i16[5] = -10000;
a.m128i_i16[6] = 32000;
a.m128i_i16[7] = 10000;
b.m128i_i16[0] = 128;
b.m128i_i16[1] = -64;
b.m128i_i16[2] = 52;
b.m128i_i16[3] = -200;
b.m128i_i16[4] = 0;
b.m128i_i16[5] = 0;
b.m128i_i16[6] = 4;
b.m128i_i16[7] = 2;
__m128i res = _mm_hadds_epi16(a, b);
printf_s("Original a:\t%6d\t%6d\t%6d\t%6d\n\t\t%6d\t%6d\t%6d\t%6d\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%6d\t%6d\t%6d\t%6d\n\t\t%6d\t%6d\t%6d\t%6d\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%6d\t%6d\t%6d\t%6d\n\t\t%6d\t%6d\t%6d\t%6d\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 2 0 128
-32768 -10000 32000 10000
Original b: 128 -64 52 -200
0 0 4 2
Result res: 1 128 -32768 32767
64 -148 0 6