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macchw
Multiply Accumulate Cross Halfword to Word Modulo Signed
Preliminary PPC440x5 CPU Core User’s Manual
instrset.fm.
September 12, 2002 Page 345 of 589
macchw
Multiply Accumulate Cross Halfword to Word Modulo Signed
prod
0:31
← (RA)
16:31
× (RB)
0:15
signed
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 signed product is summed
with the contents of RT and RT is updated with the low-order 32 bits of the signed 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.
macchw RT, RA, RB OE=0, Rc=0
macchw. RT, RA, RB OE=0, Rc=1
macchwo RT, RA, RB OE=1, Rc=0
macchwo. RT, RA, RB OE=1, Rc=1
4 RT RA RB OE 172 Rc
0 6 11 16 21 22 31