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About This Book xxiii
FLD
b,b, . . .
A list of bits, by number or name, in a named instruction or register field
REG
b
A bit in a named register
REG
b:b
A range of bits in a named register
REG
b,b, . . .
A list of bits, by number or name, in a named register
REG[FLD] A field in a named register
REG[FLD, FLD
. . .
] A list of fields in a named register
REG[FLD:FLD] A range of fields in a named register
GPR(r) General Purpose Register (GPR) r, where 0 ≤ r ≤ 31.
(GPR(r)) The contents of GPR r, where 0 ≤ r ≤ 31.
DCR(DCRN) A Device Control Register (DCR) specified by the DCRF field in an
mfdcr or mtdcr instruction
SPR(SPRN) An SPR specified by the SPRF field in an mfspr or mtspr instruction
TBR(TBRN) A Time Base Register (TBR) specified by the TBRF field in an mftb
instruction
GPRs RA, RB,
. . .
(Rx) The contents of a GPR, where
x
is A, B, S, or T
(RA|0) The contents of the register RA or 0, if the RA field is 0.
CR
FLD
The field in the condition register pointed to by a field of an instruction.
c
0:3
A 4-bit object used to store condition results in compare instructions.
n
b The bit or bit value
b
is replicated
n
times.
xx Bit positions which are don’t-cares.
CEIL(x) Least integer ≥ x.
EXTS(x) The result of extending
x
on the left with sign bits.
PC Program counter.
RESERVE Reserve bit; indicates whether a process has reserved a block of
storage.
CIA Current instruction address; the 32-bit address of the instruction being
described by a sequence of pseudocode. This address is used to set the
next instruction address (NIA). Does not correspond to any architected
register.
NIA Next instruction address; the 32-bit address of the next instruction to be
executed. In pseudocode, a successful branch is indicated by assigning
a value to NIA. For instructions that do not branch, the NIA is CIA +4.
MS(addr, n) The number of bytes represented by
n
at the location in main storage
represented by
addr
.
EA Effective address; the 32-bit address, derived by applying indexing or
indirect addressing rules to the specified operand, that specifies a
location in main storage.