Infineon Technologies C166S V2 User Manual page 395

CoMULsu
Group
Syntax
Source Operand(s)
Destination Operand(s)
Operation
(ACC) ← (op1) * (op2) + 00 0000 8000h
(MAL) ← 0
Description
Multiplies the two signed and unsigned 16-bit source operands op1 and op2,
respectively. The resulting signed 32-bit product is first sign-extended; then, it is
rounded before being stored in the 40-bit ACC register. The MAL register is cleared.
MAC Flags
MV MSL
0 -
MV Always cleared.
MSL Not affected.
ME Always cleared.
MSV Not affected.
MC Always cleared.
MZ Set if result equals zero. Cleared otherwise.
MN Set if the most significant bit of the result is set. Cleared otherwise.
Encoding
Mnemonic
CoMULsu Rw
CoMULsu Rw
CoMULsu [IDXi*] , [Rw
User Manual
Mixed Multiply & Round
Multiply/Multiply-Accumulate Instructions
CoMULsu op1, op2, rnd
op1, op2 → WORD
ACC → 40-bit signed value
ME MSV
0 -
, Rw , rnd
n m
, [Rw *] , rnd
n m
*] , rnd
m
Detailed Instruction Description
MC MZ
0 *
Format
A3 nm 41 rrr0:0000
83 nm 41 rrr0:0qqq
93 Xm 41 rrr0:0qqq
8-395
User Manual
C166S V2
CoMULsu
MN Sat.
* no
Bytes
4
4
4
V 1.7, 2001-01