Imac, Integer multiply-accumulate (dalu), Operation assembler syntax – Freescale Semiconductor StarCore SC140 User Manual
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SC140 DSP Core Reference Manual
IMAC
IMAC
Integer Multiply-Accumulate (DALU)
IMAC
Description
Status and Conditions that Affect Instruction
None.
Status and Conditions Changed by Instruction
Example 1
imac d4,d5,d6
Operation
Assembler Syntax
Dn
± (Da.L * Db.L) → Dn
IMAC ±Da,Db,Dn
IMAC
±Da,Db,Dn
Performs signed integer-multiplication on the LP contents of two source data registers (Da and Db) and
adds or subtracts the product to or from a destination data register (Dn). The default operation is the
addition of the product to the destination register.
Register Address
Bit Name
Description
Ln
L
Clears the Ln bit in the destination register.
EMR[2]
DOVF
Set if the result cannot be represented in 40 bits.
Register/Memory Address
Before
After
D4
$FF FFFF FFFB
D5
$00 0000 0003
L6:D6
$0:$00 0000 0008
$0:$FF FFFF FFF9
EMR
$0000 0000
$0000 0000