EN0-001 Exam Dumps : ARM Accredited Engineer

It is common to declare structures as "packed" in order to minimize data memory size. Which of the following accurately describes the effect of this?

An interrupt handler contains the following instruction sequence at the end. The purpose of these instructions is to clear the interrupt request in the interrupt controller and then safely re-enable interrupts.

STR r0, [r1] ; write to interrupt controller register to clear interrupt request

CPSIE i ; re-enable IRQ interrupts

Which of the following instructions should be placed at position in order to ensure that the interrupt controller sees the write before interrupts are re-enabled?

Which of the following is an optional extension to the ARMv7-A architecture?