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9-98 PPC405 Core User’s Manual
macchwu
Multiply Accumulate Cross Halfword to Word Modulo Unsigned
macchwu
Multiply Accumulate Cross Halfword to Word Modulo Unsigned
prod
0:31
← (RA)
16:31
x (RB)
0:15
unsigned
temp
0:32
← prod
0:31
+ (RT)
(RT)
← temp
1:32
The low-order halfword of RA is multiplied by the high-order halfword of RB. The unsigned 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 IBM PowerPC Embedded Environment. As such, it is not
part of the PowerPC Architecture, nor is it part of the IBM PowerPC Embedded Environment.
Programs that use this instruction may not be portable to other implementations.
macchwu RT, RA, RB OE=0, Rc=0
macchwu. RT, RA, RB OE=0, Rc=1
macchwuo RT, RA, RB OE=1, Rc=0
macchwuo. RT, RA, RB OE=1, Rc=1
4 RT RA RB OE 140 Rc
0 6 11 16 21 22 31