AMCC Proprietary 257
Revision 1.02 - September 10, 2007
PPC405 Processor
maclhw
Multiply Accumulate Low Halfword to Word Modulo Signed
Preliminary User’s Manual
maclhw
Multiply Accumulate Low Halfword to Word Modulo Signed
prod
0:31
← (RA)
16:31
x (RB)
16:31
signed
temp
0:32
← prod
0:31
+ (RT)
(RT)
← temp
1:32
The low-order halfword of RA is multiplied by the low-order halfword of RB. The signed product is summed with the
contents of RT and the sum is stored in a 33-bit temporary register. The contents of RT are replaced by the low-
order 32 bits of the temporary register.
Registers Altered
•RT
• CR[CR0]
LT, GT, EQ, SO
if Rc contains 1
• XER[SO, OV] if OE contains 1
Architecture Note
This instruction is part of the Multiply-Accumulate instruction set extensions and complies with the architectural
requirements for APUs of the PowerPC Embedded Environment. As such, it is not part of the PowerPC Architec-
ture, nor is it part of the PowerPC Embedded Environment. Programs that use this instruction may not be portable
to other implementations.
maclhw RT, RA, RB OE=0, Rc=0
maclhw. RT, RA, RB OE=0, Rc=1
maclhwo RT, RA, RB OE=1, Rc=0
maclhwo. RT, RA, RB OE=1, Rc=1
4RTRARBOE428Rc
0 6 11 16 21 22 31
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