2.4. The following problems deal with translating from C to ARM. Assume that the variables f, g, h, i, and j are assigned to registers r0, r1, r2, r3, and r4, respectively. Assume that the base address of the arrays A and B are in registers r6 and r7, respectively.

a.	f = g + h + B[4];
b.	f = g A[B[4]];

2.4.1 For the C statements above, what is the corresponding ARM assembly code?

2.4.2 For the C statements above, how many ARM assembly instructions are needed to perform the C statement?

2.4.3 For the C statements above, how many different registers are needed to carry out the C statement?

The following problems deal with translating from ARM to C. Assume that the variables f, g, h, i, and j are assigned to registers r0, r1, r2, r3, and r4, respectively. Assume that the base address of the arrays A and B are in registers r6 and r7, respectively.

a.	ADD r0, r0, r1 ADD r0, r0, r2 ADD r0, r0, r3 ADD r0, r0, r4
b.	LDR r0, [r6, #4] LDR r1, [r7, #8] ADD r3, r0, r1

2.4.4 For the ARM assembly instructions above, what is the corresponding C statement?

2.4.5 For the ARM assembly instructions above, rewrite the assembly code to minimize the number of ARM instructions (if possible) needed to carry out the same function.

2.4.6 How many registers are needed to carry out the ARM assembly as written above? If you could rewrite the code above, what is the minimal number of registers needed?