AMCC Proprietary 283
Revision 1.02 - September 10, 2007
PPC405 Processor
mullw
Multiply Low Word
Preliminary User’s Manual
mullw
Multiply Low Word
prod
0:63
← (RA) × (RB) signed
(RT)
← prod
32:63
The 64-bit signed product of register RA and register RB is formed. The least significant 32 bits of the result is
placed into register RT.
If the signed product cannot be represented in 32 bits and OE=1, XER[SO, OV] are set to 1.
Registers Altered
•RT
• CR[CR0]
LT, GT, EQ, SO
if Rc contains 1
• XER[SO, OV] if OE=1
Programming Note
The least significant 32 bits of the product are correct, regardless of whether register RA and register RB are inter-
preted as signed or unsigned numbers. The overflow indication is correct only if the operands are regarded as
signed numbers.
Architecture Note
This instruction is part of the PowerPC User Instruction Set Architecture.
mullw RT, RA, RB OE=0, Rc=0
mullw. RT, RA, RB OE=0, Rc=1
mullwo RT, RA, RB OE=1, Rc=0
mullwo. RT, RA, RB OE=1, Rc=1
31 RT RA RB OE 235 Rc
0 6 11 16 21 22 31
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