Page 249 - ARM 64 Bit Assembly Language

Integer mathematics 237

1 add x1, x0, x0, lsl #1
2 add x0, x1, x0, lsl #2
7.5. Show the optimally efficient instruction(s) necessary to multiply a number in register
x0 by the constant 67 10 .
7.6. Show how to divide 78 10 by 6 10 using binary long division.
7.7. Demonstrate the division algorithm using a sequence of tables as shown in Sec-
tion 7.3.2 to divide 155 10 by 11 10 .
7.8. When dividing by a constant value, why is it desirable to have m as large as possible?
7.9. Modify your program from Exercise 5.13. in Chapter 5 to produce a 128-bit result,
rather than a 64-bit result.
7.10. Modify your program from Exercise 5.13. in Chapter 5 to produce a 128-bit result,
rather than a 64-bit result. How would you do this in C?
7.11. Write the bigint_shift_left_chunk function shown in Listing 7.8 in AArch64
assembly, and measure the performance improvement.
7.12. Write the bigint_mul_uint function in AArch64 assembly, and measure the perfor-
mance improvement.
7.13. Write the bigint_mul function in AArch64 assembly, and measure the performance
improvement.