In the following C function, we have left the definition of operation 0P incomplete:

A. What operation is 0P?

B. Annotate the code to explain how it works.

#define OP short arith (short x) { return x OP 16; } When compiled, GCC generates the following assembly code: short arith (short x) x in %rdi arith: /* Unknown operator */ leaq testq cmovns sarq ret 15 (%rdi), %rbx %rdi, %rdi %rdi, %rbx $4, rbx