Computer system is usually constructed in multiple levels. The following four qu

Question

Computer system is usually constructed in multiple levels. The following four questions under this problem involve "High language level", "Machine language level (ISA)", and "Microprogramming level (micro-architecture)". Translate the C^+ + code segment (1^st column in the table below) into Mic-1 ijvm machine language (2^nd column), assuming i, j, and k are the first, the second and the third local variables, respectively. Translate the code in Mic-1 IJVM instructions you derive above into Mic-I machine instructions (3^nd column). Please use hexadecimals to represent machine language instructions. For each Mic-1 machine instruction in Column 3. write the number of Mic-1 micro-instructions needed to interpret the machine instruction in Column 4. Don't forget the Main l micro-instruction Assuming the initial values of the three local variables are I = 1, j = l, k = 0. respectively , how many nanoseconds does it take for a I-GHz Mic-1 computer to execute this C++ code segment?

Explanation / Answer

ILOAD i 0x15 0x01 ILOAD j 0x15 0x02 IADD 0x60 ISTORE i 0x36 0x01 ILOAD i 0x15 0x01 BIPUSH 2 0x10 IF_ICMPEQ L1 0x9F 0x00 0x0D ILOAD i 0x15 0x01 BIPUSH 2 0x10 IADD 0x60 ISTORE k 0x36 0x03 GOTO L2 0xA7 L1: BIPUSH 10 0x10 ISTORE k 0x36 0x03 L2:

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