5.131 · exercise

Fill in the blank: bit manipulation

Fill in the missing mnemonic or number on each line so it sets, flips, tests, extracts or inserts the bits described.

0 of 6 correct

Set bit 3 of w19 and leave every other bit as it was.

w19, w19, 0x8

Flip bits 0 to 3 of w19, so each 1 becomes 0 and each 0 becomes 1, and leave the other bits alone.

w19, w19, 0xF

Jump to even when bit 0 of x20 is 0, without setting the flags first.

x20, 0, even

Copy the 8-bit field at bits 16 to 23 of w0 into the low byte of w1, with zeros above it.

ubfx w1, w0, , 8

Put the low 8 bits of w2 into bits 8 to 15 of w0, and keep the other bits of w0 as they were.

w0, w2, 8, 8

In one instruction, OR w9 with w10 moved up 4 places, so the low hex digit of w10 lands in bits 4 to 7 of the result.

orr w0, w9, w10, 4