Double-precision Floating-point Vector Intrinsics

The double-precision floating-point intrinsics listed here are designed for the Intel® Pentium® 4 processor with Streaming SIMD Extensions 3 (Intel® SSE3). The prototypes for these intrinsics are in the pmmintrin.h header file.

To use these intrinsics, include the immintrin.h file as follows:

#include <immintrin.h>

The results of each intrinsic operation are placed in the registers R0 and R1.

Intrinsic Name

Operation

Corresponding Intel® SSE3 Instruction

_mm_addsub_pd

Subtract and add

ADDSUBPD

_mm_hadd_pd

Add

HADDPD

_mm_hsub_pd

Subtract

HSUBPD

_mm_loaddup_pd

Duplicate

MOVDDUP

_mm_movedup_pd

Duplicate

MOVDDUP

_mm_addsub_pd

extern __m128d _mm_addsub_pd(__m128d a, __m128d b);

Adds upper vector element while subtracting lower vector element.

R0

R1

a0 - b0;

a1 + b1;

_mm_hadd_pd

extern __m128d _mm_hadd_pd(__m128d a, __m128d b);

Adds adjacent vector elements.

R0

R1

a0 + a1;

b0 + b1;

_mm_hsub_pd

extern __m128d _mm_hsub_pd(__m128d a, __m128d b);

Subtracts adjacent vector elements.

R0

R1

a0 - a1;

b0 - b1;

_mm_loaddup_pd

extern __m128d _mm_loaddup_pd(double const * dp);

Duplicates a double value into upper and lower vector elements.

R0

R1

*dp;

*dp;

_mm_movedup_pd

extern __m128d _mm_movedup_pd(__m128d a);

Duplicates lower vector element into upper vector element.

R0

R1

a0;

a0;

Para obtener información más completa sobre las optimizaciones del compilador, consulte nuestro Aviso de optimización.