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Instruction Set 9-125
mulhw
Multiply High Word
mulhw
Multiply High Word
prod
0:63
← (RA) × (RB) signed
(RT)
← prod
0:31
The 64-bit signed product of registers RA and RB is formed. The most significant 32 bits of the result
is placed into register RT.
Registers Altered
•RT
• CR[CR0]
LT, GT, EQ, SO
if Rc contains 1
Programming Note
The most significant 32 bits of the product, unlike the least significant 32 bits, may differ depending on
whether the registers RA and RB are interpreted as signed or unsigned quantities. mulhw generates
the correct result when these operands are interpreted as signed quantities. mulhwu generates the
correct result when these operands are interpreted as unsigned quantities.
Architecture Note
This instruction is part of the PowerPC User Instruction Set Architecture.
mulhw RT, RA, RB Rc=0
mulhw. RT, RA, RB Rc=1
31 RT RA RB 75 Rc
0 6 11 16 21 22 31