Method and apparatus for affecting subsequent instruction proces

Details Method and apparatus for affecting subsequent instruction proces Method and apparatus for affecting subsequent instruction proces

1997-11-03

1999-12-07

Treat, William M.

Electrical computers and digital processing systems: processing

Processing control

Branching

G06F 946

Patent

active

060000295

ABSTRACT:
A method and apparatus affects subsequent instruction processing in a data processor (10). In one embodiment, a delay interrupt recognition instruction (IDLY4) is executed by data processor (10) to delay or conditionally delay interrupt recognition for a controlled interval, either for a predetermined period of time or for a predetermined number of instructions, so that a read/modify/write sequence of instructions can be performed without dedicated instructions which define the modification operation. The IDLY4 instruction may affect the manner in which subsequent instructions affect a condition bit (38). The condition bit (38) may thus be used to determine if exception processing occurred during the interrupt non-recognition interval after execution of the IDLY4 instruction.

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