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Ch1 指令集架構（ISA）
第 9 題／共 39 題
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9. CPU Design Principles、Basic Block、Lazy Linkage
#CC-01-009
中
CPU Design Principles
Basic Block
Lazy Linkage
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☆
Which of the following statements are true?
A
(a) The machine instruction (
add $t0, $s2, $t0
) tells us two CPU design principles: I. Simplicity favours regularity, and II. Smaller is faster.
B
(b) Each basic block in a machine code program has a single-entry point, which may be a branch target, and a single exit point, with no branch instructions except possibly at the end. A basic block serves a purpose similar to blocks in C programs, in that it provides a unit for analyzing the lifetime of variables within the block.
C
(c) If the clock period of a CPU is set as n ns and the CPU supports multi-cycle instructions, comparison and branch instructions, like bge, that require 2n ns can be included in the instruction set without increasing the clock period.
D
(d) The key idea of lazy linkage is to use an indirection table that initially holds the address of a linker/loader resolver for a DLL routine and is later updated with the address of the loaded DLL routine, making subsequent calls more efficient.
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完整推導請見《WH 資工筆記 · 計算機組織與結構》Ch1 指令集架構（ISA）
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