_mm_madd_epi16
Classification
SSE_ALL, Arithmetic, CPUID Test: SSE2
Header File
Instruction
PMADDWD xmm, xmm
Synopsis
_mm_madd_epi16(__m128i a, __m128i 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 3
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