sum a global array

A global array of eight scores lives in .data, and its length sits beside it. Add every element and print the total.

This is the course's array idiom in one loop: a base address in an x register, a word index in a w register, and the scaled-index load ldr wX, [base, wI, sxtw 2], which sign-extends the index and shifts it left two bits to turn a word count into a byte offset.

what is checked

• the total is printed on its own line
• the program exits cleanly
• elements are loaded with the scaled-index form (sxtwSign-extend a word to 64-bit Xd. present, total not written in)