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EN0-001 Exam Dumps : ARM Accredited Engineer

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ARM Accredited Engineer Questions and Answers

Question 1

Which of the following processor resources do NOT have to be saved or modified by the Linux scheduler during context switch?

Options:

A.

Registers R0-R15

B.

Thread and process ID registers

C.

The CPSR

D.

NEON and VFP registers

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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

According to the AAPCS (with soft floating point linkage), when the caller "func" calls sprintf, where is the value of the parameter "x" placed?

#include

void func(double x, int i , char *buffer)

{

sprintf(buffer, "pass %d: value = %f\n", i, x); }

Options:

A.

Split between register R3 and 4 bytes on the stack

B.

Split between registers R3 and R4

C.

8 bytes on the stack

D.

VFP Register D0