5.50 · exercise

Fill in the Blank: Array and Struct Syntax

Fill in the missing mnemonics, extend options, and offsets that reach array elements and struct fields in memory.

0 of 5 correct

Fill in the Blank

An array of .dword values starts at the label nums. Give the number of bytes between one element and the next, in decimal.

address of nums[i] = nums + (i * )

Fill in the Blank

Store w22 into a .word array based at x19, scaling the 64-bit index held in x20 inside the brackets.

str w22, [x19, x20, 2]

Fill in the Blank

Store w22 into the same .word array, this time with the index held in the 32-bit register w20.

str w22, [x19, w20, 2]

Fill in the Blank

A date struct has field offsets date_year, date_month, and date_day. An employee struct holds a date at offset employee_start. With the employee record base in x19, store the day byte from w20.

strb w20, [x19, employee_start + ]

Fill in the Blank

The record base is in x19 and rec_b is the offset of a signed char field. Load that field into a 32-bit register.

w21, [x19, rec_b]