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9-170 PPC405 Core User’s Manual
stwbrx
Store Word Byte-Reverse Indexed
stwbrx
Store Word Byte-Reverse Indexed
EA ← (RA|0) + (RB)
MS(EA, 4)
← (RS)
24:31
|| (RS)
16:23
|| (RS)
8:15
|| (RS)
0:7
An 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 contents of register RS are byte-reversed: the least significant byte becomes the most significant
byte, the next least significant byte becomes the next most significant byte, and so on. The result is
stored into the word at the EA.
If instruction bit 31 contains 1, the contents of CR[CR0] are undefined.
Registers Altered
• None
Invalid Instruction Forms
• Reserved fields
Architecture Note
This instruction is part of the PowerPC User Instruction Set Architecture.
stwbrx RS, RA, RB
31 RS RA RB 662
0 6 11 16 21 31