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macchwu
Multiply Accumulate Cross Halfword to Word Modulo Unsigned
PPC440x5 CPU Core User’s Manual Preliminary
Page 348 of 589
instrset.fm.
September 12, 2002
macchwu
Multiply Accumulate Cross Halfword to Word Modulo Unsigned
prod
0:31
← (RA)
16:31
× (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 RT is updated with the low-order 32 bits of the unsigned sum.
Registers Altered
•RT
• CR[CR0] if Rc contains 1
• XER[SO, OV] if OE contains 1
Architecture Note
This instruction is implementation-specific and programs which use this instruction may not be portable to
other PowerPC Book-E implementations. See Instruction Set Portability on page 250.
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