Glossary of Terms and Abbreviations
Glossary-5
Finish
. Finishing occurs in the last cycle of execution. In this cycle, the CQ
entry is updated to indicate that the instruction has Tnished
executing.
Floating-point register
(FPR)
. Any of the 32 registers in the oating-point
register Tle. These registers provide the source operands and
destination results for oating-point instructions. Load instructions
move data from memory to FPRs and store instructions move data
from FPRs to memory. The FPRs are 64 bits wide and store oating-
point values in double-precision format
Flush
. An operation that causes a cache block to be invalidated and the data,
if modiTed, to be written to memory.
Fraction
. In the binary representation of a oating-point number, the Teld of
the
signiTcand
that lies to the right of its implied binary point.
General-purpose register
(GPR)
. Any of the 32 registers in the general-
purpose register Tle. These registers provide the source operands and
destination results for all integer data manipulation instructions.
Integer load instructions move data from memory to GPRs and store
instructions move data from GPRs to memory.
Guarded
. The guarded attribute pertains to out-of-order execution. When a
page is designated as guarded, instructions and data cannot be
accessed out-of-order.
Harvard architecture
. An architectural model featuring separate caches for
instructions and data.
Hashing
. An algorithm used in the
page table
search process.
IEEE 754
. A standard written by the Institute of Electrical and Electronics
Engineers that deTnes operations and representations of binary
oating-point numbers.
Illegal instructions
. A class of instructions that are not implemented for a
particular PowerPC processor. These include instructions not deTned
by
the
PowerPC
architecture.
implementations, instructions that are deTned only for 64-bit
implementations are considered to be illegal instructions. For 64-bit
implementations instructions that are deTned only for 32-bit
implementations are considered to be illegal instructions.
In
addition,
for
32-bit
G
H
H