Floating Point Dot Product Intrinsics

These Intel® Streaming SIMD Extensions (Intel® SSE4) intrinsics enable floating point single-precision and double-precision dot products. The prototypes for these intrinsics are in the smmintrin.h file.

Intrinsic	Operation	Corresponding Intel® SSE4 Instruction
_mm_dp_pd	Double-precision dot product	`DPPD`
_mm_dp_ps	Single-precision dot product	`DPPS`

__m128d _mm_dp_pd ( __m128d a, __m128d b, const int mask)

Calculates the dot product of double-precision packed values with mask-defined summing and zeroing of the parts of the result.

__m128 _mm_dp_ps ( __m128 a, __m128 b, const int mask)

Calculates the dot product of single-precision packed values with mask-defined summing and zeroing of the parts of the result.