5.46 · exercise

Predict: ARMv8 Execution

Predict the register values and flags these AArch64 snippets leave behind.

0 of 4 correct

// sp holds 0x8000 on entry to main
stp x29, x30, [sp, -32]!
mov x29, sp

What exact value does x29 hold after these two instructions? Answer in hex with a 0x prefix.

mov w1, 14
mov w2, 3
sdiv w0, w1, w2

What is the exact integer value stored in w0 after execution?

mov x22, 10
mov x23, 0
udiv x21, x22, x23

What exact value does the CPU write into the destination register x21?

mov x1, 7
mov x2, 7
cmp x1, x2
b.eq top

b.eq branches on the state of one condition flag. Write that flag's letter (N, Z, C, or V).