EN0-001ARM Accredited engineer
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Last Updated Apr 23, 2024 Ace your exams with our consistently updated EN0-001 exam dumps.
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EN0-001 Online Practice Questions and Answers
In which of these cases would code have better performance when compiled for Thumb state than when compiled for ARM state?
A. When the processor has no data cache
B. When the code involves many shifting operations
C. When the code has many conditionally executed instructions
D. When the processor can only fetch instructions 16-bits at a time
The instruction LDR pc, [ r1 ] takes longer to execute on a particular system, than the instruction LDR r0, [ r1 ]. In both cases, r1 points to the same address in external memory.
Which of the following is the most likely explanation of why it takes more cycles?
A. The value read from address r1 must be passed from the data side of the processor to the instruction side
B. The LDR pc, [r1] causes the instruction pipeline to be flushed, but the LDR r0, [r1] does not
C. The LDR pc, [ r1 ] instruction requires additional alignment checking, as the result must be half word-aligned (Thumb) or word-aligned (ARM)
D. The LDR r0, [r1] can be speculatively executed, but the LDR pc, [r1] instruction cannot be speculatively executed
When using the ARM Compiler (armcc), which of the following possible keywords can be used to remove padding bytes from a structure?
A. __package
B. __packed
C. __compact
D. __compress
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