_mm_hadds_pi16
Microsoft Specific
Emits the Supplemental Streaming SIMD Extensions 3 (SSSE3) instruction phaddsw. This instruction adds the elements of two 64-bit parameters.
__m64 _mm_hadds_pi16(
__m64 a,
__m64 b
);
Parameters
[in] a
A 64-bit parameter that contains four 16-bit signed integers.[in] b
A 64-bit parameter that contains four 16-bit signed integers.
Return value
A 64-bit value that contains four 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(b0 + b1)
r3 := SATURATE_16(b2 + b3)
Requirements
Intrinsic |
Architecture |
|---|---|
_mm_hadds_pi16 |
x86, x64 |
Header file <tmmintrin.h>
Remarks
r0-r3, a0-a3, and b0-b3 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 ()
{
__m64 a, b;
a.m64_i16[0] = -1;
a.m64_i16[1] = 1;
a.m64_i16[2] = 4096;
a.m64_i16[3] = 127;
b.m64_i16[0] = -127;
b.m64_i16[1] = 50;
b.m64_i16[2] = 64;
b.m64_i16[3] = -128;
__m64 res = _mm_hadd_pi16(a, b);
printf_s("Original a:\t%4d\t%4d\t%4d\t%4d\nOriginal b:\t%4d\t%4d\t%4d\t%4d\n",
a.m64_i16[0], a.m64_i16[1], a.m64_i16[2], a.m64_i16[3],
b.m64_i16[0], b.m64_i16[1], b.m64_i16[2], b.m64_i16[3]);
printf_s("Result res:\t%4d\t%4d\t%4d\t%4d\n",
res.m64_i16[0], res.m64_i16[1], res.m64_i16[2], res.m64_i16[3]);
_mm_empty();
return 0;
}
Original a: -1 1 4096 127
Original b: -127 50 64 -128
Result res: 0 4223 -77 -64