Lbzu - IBM PPC440X5 CPU Core User Manual

lbzu

Load Byte and Zero with Update
PPC440x5 CPU Core User's Manual
lbzu
Load Byte and Zero with Update
lbzu RT, D(RA)
35
0 6
EA (RA|0) + EXTS(D)
(RA) EA
24
(RT) 0 || MS(EA,1)
An effective address (EA) is formed by adding a displacement to a base address. The displacement is
obtained by sign-extending the 16-bit D field to 32 bits. The base address is 0 if the RA field is 0 and is the
contents of register RA otherwise. The EA is placed into register RA.
The byte at the EA is extended to 32 bits by concatenating 24 0-bits to its left. The result is placed into
register RT.
Registers Altered
• RA
• RT
Invalid Instruction Forms
• RA = RT
• RA = 0
Page 322 of 589
RT RA
11 16
Preliminary
D
instrset.fm.
September 12, 2002
31