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Ch1 指令集架構（ISA）
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21. MIPS ISA、Instruction Format、R-type
#CC-01-021
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MIPS ISA
Instruction Format
R-type
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Which of the following statements about the MIPS ISA design are true?
A
(a) Not all instructions using the I-type format perform sign-extension on the 16-bit immediate values.
B
(b) The jump instruction,
j
, can always jump from address A to address B as long as the offset between A and B is less than ±2^15 words.
C
(c) MIPS branch instructions are encoded using the I-type format that contains only two registers. This design is based on the principle of making the common case fast.
D
(d) If we add more R-type instructions to the ISA, and allow the compiler to make use of these extra instructions to compiled a program, then the program size in terms of the number of instructions will always be smaller than or equal to the size compiled using the original ISA.
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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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