5.113 · exercise

Fill in the blank: branching

Fill in the instruction or condition each line needs: csel, cset and cinc pick a value with no branch, cbz guards a division, and an unsigned test skips the body of an if.

0 of 5 correct

Fill in the blank

After cmp a_r, b_r, put the smaller of the two signed values in min_r with one instruction and no branch.

min_r, a_r, b_r, lt

Fill in the blank

After cmp w0, 0, write 1 to neg_r when w0 is negative and 0 when it is not.

neg_r, lt

Fill in the blank

Add 1 to hits_r only when the last cmp found its two values equal, and leave hits_r as it is otherwise.

hits_r, hits_r, eq

Fill in the blank

Skip the division when the divisor in w20 is 0 by jumping to no_div, with no cmp in front.

w20, no_div

Fill in the blank

idx_r and len_r hold unsigned values, and the C reads if (idx < len) { body }. After cmp idx_r, len_r, complete the branch that jumps past the body when the test is false.

b. out_of_range