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EN0-001 Exam Dumps : ARM Accredited Engineer

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ARM Accredited Engineer Questions and Answers

Question 1

An external debugger would need to clean the contents of the processor data cache in which of the following cases?

Options:

A.

When it changes the contents of ARM registers (r0-r15)

B.

When it displays the contents of an area of cacheable data

C.

When it displays the contents of an area of cacheable code

D.

When it sets a software breakpoint

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Question 2

In an ARMv7-A system, the following C function calculates a simple checksum for an input data packet of variable length. The checksum is defined to be the sum of all of the 16-bit data items in the packet modulo 65536. The parameter data_items contains the number of 2-byte data items in the packet, and it cannot be zero by design.

When using an ARM compiler, which TWO of the following optimizations could improve the performance of this code? (Choose two)

Options:

A.

Use a do/while loop instead of a for loop

B.

Change the type of sum to be an unsigned short

C.

Change the type of i to be an unsigned int

D.

Use signed variables instead of unsigned variables

E.

Declare sum as a global variable

Question 3

Which events would be counted using the Performance Monitoring Unit (PMU) in order to measure the data cache efficiency of an application?

Options:

A.

Memory read instructions, and memory write instructions

B.

Architecturally executed instructions, and instruction fetches causing a cache line refill

C.

Memory access instructions causing a cache line refill, and memory read and write operations causing a cache access

D.

Memory read or write operations causing a cache access, and architecturally executed instructions