_m_pmulhw
Classification
MMX, Arithmetic, CPUID Test: MMX
Header File
Instruction
PMULHW mm, mm
Synopsis
_m_pmulhw(__m64 a, __m64 b);
Description
Multiply the packed signed 16-bit integers in "a" and "b", producing intermediate 32-bit integers, and store the high 16 bits of the intermediate integers in "dst".
Operation
FOR j := 0 to 3
i := j*16
tmp[31:0] := SignExtend32(a[i+15:i]) * SignExtend32(b[i+15:i])
dst[i+15:i] := tmp[31:16]
ENDFOR