_mm_addsub_pd
Microsoft Specific
Generates the addsubpd instruction.
__m128d _mm_addsub_pd(
__m128d a,
__m128d b,
);
Parameters
[in] a
The first operand.[in] b
The second operand.
Requirements
Intrinsic |
Architecture |
|---|---|
_mm_addsub_pd |
Intel SSE3 |
Header file <intrin.h>
Remarks
The addsubpd instruction performs a packed operation involving double-precision addition and subtraction on 128-bit data. Each 128-bit operand consists of two 64-bit data elements, numbered from 0 to 1, with 1 being the high-order element. The operation subtracts the numbers in the low-order data elements and adds the numbers in the high-order elements. Thus, if the input is { A0, A1 } and { B0, B1 }, then the output is { A0–B0, A1+B1 }.
This routine is only available as an intrinsic.
Example
// processor: x86 with SSE3
// Execute the addsub_pd instruction using the intrinsic
// _mm_addsub_pd
#include <stdio.h>
#include <intrin.h>
#pragma intrinsic ( _mm_addsub_pd )
int main( )
{
__m128d u, v, w;
__declspec(align(16)) double a[2] = { 0.1, 0.2 };
__declspec(align(16)) double b[2] = { 0.001, 0.002 };
printf_s("Loading double values %e %e into XMM register.\n",
a[0], a[1] );
u = _mm_load_pd(a);
printf_s("Loading double values %e %e into XMM register.\n",
b[0], b[1] );
v = _mm_load_pd(b);
printf_s("Calling _mm_addsub_pd to modify these values.\n");
w = _mm_addsub_pd ( u , v);
printf_s("Result: %e %e \n", w.m128d_f64[0], w.m128d_f64[1]);
}
Loading double values 1.000000e-001 2.000000e-001 into XMM register. Loading double values 1.000000e-003 2.000000e-003 into XMM register. Calling _mm_addsub_pd to modify these values. Result: 9.900000e-002 2.020000e-001