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stbux
Store Byte with Update Indexed
Preliminary PPC440x5 CPU Core User’s Manual
instrset.fm.
September 12, 2002 Page 411 of 589
stbux
Store Byte with Update Indexed
EA ← (RA|0) + (RB)
MS(EA, 1)
← (RS)
24:31
(RA) ← EA
An effective address (EA) is formed by adding an index to a base address. The index is the contents of
register RB. The base address is 0 when the RA field is 0, and is the contents of register RA otherwise.
The least significant byte of register RS is stored into the byte at the EA.
The EA is placed into register RA.
If instruction bit 31 contains 1, the contents of CR[CR0] are undefined.
Registers Altered
•RA
Invalid Instruction Forms
• Reserved fields
RA=0
stbux RS, RA, RB
31 RS RA RB 247
0 6 11 16 21 31