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Online Computer Terms Dictionary - D

delayed control-transfer

<SPARC, programming> A technique used on the SPARC 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)

 


Nearby terms: dehose DEK Delaunay triangulation delayed control-transfer delay instruction delay slot delete

delay instruction

delayed control-transfer

 


Nearby terms: DEK Delaunay triangulation delayed control-transfer delay instruction delay slot delete delimiter

delay slot

delayed control-transfer

 


Nearby terms: Delaunay triangulation delayed control-transfer delay instruction delay slot delete delimiter delint
 

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