Texas Instruments TMS320C67X/C67X+ DSP - Manual (Page 222)

MPYLH Multiply Signed 16 LSB x Signed 16 MSB
3-162 Instruction Set SPRU733
Example MPYLH .M1 A1,A2,A3
Before instruction 2 cycles after instruction
A1 0900 000Eh 14 † A1 0900 000Eh
A2 0029 00A7h 41 ‡ A2 0029 00A7h
A3 xxxx xxxxh A3 0000 023Eh 574
† Signed 16-LSB integer
‡ Signed 16-MSB integer