Filter
Top Products
nmachhw
Negative Multiply Accumulate High Halfword to Word Modulo Signed
Preliminary PPC440x5 CPU Core User’s Manual
instrset.fm.
September 12, 2002 Page 387 of 589
nmachhw
Negative Multiply Accumulate High Halfword to Word Modulo Signed
nprod
0:31
← –((RA)
0:15
× (RB)
0:15
) signed
temp
0:32
← nprod
0:31
+ (RT)
(RT)
← temp
1:32
The high-order halfword of RA is multiplied by the high-order halfword of RB. The signed product is
subtracted from the contents of RT and RT is updated with the low-order 32 bits of the result.
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.
nmachhw RT, RA, RB OE=0, Rc=0
nmachhw. RT, RA, RB OE=0, Rc=1
nmachhwo RT, RA, RB OE=1, Rc=0
nmachhwo. RT, RA, RB OE=1, Rc=1
4RTRARBOE46Rc
0 6 11 16 21 22 31