EN0-001 Exam Dumps : ARM Accredited Engineer

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)

An undefined instruction will cause an Undefined Instruction exception to be taken when:

In a loop termination test, how might a programmer indicate to the compiler that the loop iteration count limit is divisible by four?