May 2024
Intermediate to advanced
536 pages
17h 10m
English
Content preview from Compilers: Principles and Practice by Pearson
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44 Compilers – Principles and Practice
2.2.5 Comments on the Compiled Code
The compiled code for the example program was executed on the VM1 simulator described in
Section 2.3 and executed properly. If you compare the “machine code” given there with the compiled
code given in Section 2.2.4, you will notice considerable differences, though both of them achieve
exactly the same computation. The compiled code is almost double the size of a code written by an
expert VM1 programmer.
The most noticeable difference is in the use of unnecessary Load and Store instructions. If a
previous instruction has left a useful value in the A register, it is not ...
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