slovodefinícia
delay slot
(foldoc)
delayed control-transfer
annulled branch
branch delay slot
delay instruction
delay slot

A technique used on the SPARC processor to reduce
the effect of pipeline breaks by executing the instruction after
a branch instruction (the "delay instruction" in the "delay
slot"). If there is no useful instruction which can be placed in
the delay slot then the "annul bit" on the control transfer
instruction can be set, preventing execution of the delay
instruction (unless the control transfer is conditional and is
taken).

Annulled branches are indicated in SPARC assembler language by
appending ",A" to the operation code. For example,

LOOP: ...
CMP %L0,10
BLE,A LOOP
ADD %L2, %L3, #L4

If the delay instruction is also a control transfer instruction
then it gets more complicated. Both control transfer instructions
are executed (but not the following instruction) and, assuming
they are both taken, control is transferred briefly to the
destination of the first and then immediately to the destination
of the second.

(2001-06-26)
podobné slovodefinícia
branch delay slot
(foldoc)
delayed control-transfer
annulled branch
branch delay slot
delay instruction
delay slot

A technique used on the SPARC processor to reduce
the effect of pipeline breaks by executing the instruction after
a branch instruction (the "delay instruction" in the "delay
slot"). If there is no useful instruction which can be placed in
the delay slot then the "annul bit" on the control transfer
instruction can be set, preventing execution of the delay
instruction (unless the control transfer is conditional and is
taken).

Annulled branches are indicated in SPARC assembler language by
appending ",A" to the operation code. For example,

LOOP: ...
CMP %L0,10
BLE,A LOOP
ADD %L2, %L3, #L4

If the delay instruction is also a control transfer instruction
then it gets more complicated. Both control transfer instructions
are executed (but not the following instruction) and, assuming
they are both taken, control is transferred briefly to the
destination of the first and then immediately to the destination
of the second.

(2001-06-26)

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