_mm_madd_pi16
Classification
MMX, Arithmetic, CPUID Test: MMX
Header File
mmintrin.h
Instruction
PMADDWD mm, mm
Synopsis
 _mm_madd_pi16(__m64 a, __m64 b);
Description
Multiply packed signed 16-bit integers in "a" and "b", producing intermediate signed 32-bit integers. Horizontally add adjacent pairs of intermediate 32-bit integers, and pack the results in "dst".
Operation
FOR j := 0 to 1
	i := j*32
	dst[i+31:i] := SignExtend32(a[i+31:i+16]*b[i+31:i+16]) + SignExtend32(a[i+15:i]*b[i+15:i])
ENDFOR