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9-126 PPC405 Core User’s Manual
mulhwu
Multiply High Word Unsigned
mulhwu
Multiply High Word Unsigned
prod
0:63
← (RA) × (RB) unsigned
(RT)
← prod
0:31
The 64-bit unsigned product of registers RA and RB is formed. The most significant 32 bits of the
result are 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. The mulhw
instruction generates the correct result when these operands are interpreted as signed quantities.
The mulhwu instruction 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.
mulhwu RT, RA, RB Rc=0
mulhwu. RT, RA, RB Rc=1
31 RT RA RB 11 Rc
0 6 11 16 21 31