(a) For the following C statement, write a minimal sequence of RISC-V assembly instructions that performs the identical operation. Assume x5 = A, and x11 is the base address of C.

A = C[0] << 16;

(b) Find the shortest sequence of RISC-V instructions that extracts bits 12 down to 7 from register x3 and uses the value of this field to replace bits 28 down to 23 in register x4 without changing the other bits of registers x3 or x4. (Be sure to test your code using x3 = 0 and x4 = 0xffffffffffffffff. Doing so may reveal a common oversight.)

(c) Provide a minimal set of RISC-V instructions that may be used to implement the following pseudoinstruction:

not x5, x6 // bit-wise invert

[Hint: note that there is no not instruction in RISCV. However, an XOR immediate instruction could be used]