IBM PPC440X5 Computer Hardware User Manual


 
lmw
Load Multiple Word
PPC440x5 CPU Core User’s Manual Preliminary
Page 334 of 589
instrset.fm.
September 12, 2002
lmw
Load Multiple Word
EA (RA|0) + EXTS(D)
r
RT
do while r
31
GPR(r))
MS(EA,4)
r
r+1
EA
EA + 4
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 in the instruction to 32 bits. The base address is 0 if the RA field
is 0 and is the contents of register RA otherwise.
A series of consecutive words starting at the EA are loaded into a set of consecutive GPRs, starting with
register RT and continuing to and including GPR(31).
Registers Altered
RT through GPR(31).
Invalid Instruction Forms
RA is in the range of registers to be loaded, including the case RA = RT = 0.
Programming Note
This instruction can be restarted, meaning that it could be interrupted after having already updated some of
the target registers, and then re-executed from the beginning (after returning from the interrupt), in which
case the registers which had already been loaded prior to the interrupt will be loaded a second time. Note that
if RA is in the range of registers to be loaded (an invalid form; see above) and is also one of the registers
which is loaded prior to the interrupt, then when the instruction is restarted the re-calculated EA will be incor-
rect, since RA will no longer contain the original base address. Hence the definition of this as an invalid form
which software must avoid.
lmw RT, D(RA)
46 RT RA D
0 6 11 16 31