May 2024
Intermediate to advanced
536 pages
17h 10m
English
Content preview from Compilers: Principles and Practice by Pearson
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274 Compilers – Principles and Practice
We could have used CPU register eax, in place of T1, and reduced one more instruction. That would
be a small example of machine-dependent optimization.
Operations like i = i + 1 is very frequent in normal programs, and most of the CPUs provide
incr instruction for efficiently coding them. If the IR is made to contain a unary operator INC
instead of i = i + 1, the code generation is straightforward.
9.1.4 Allocation of CPU Registers
Even the very simple examples shown above should have told you that decision about which value
is to be held in which register can become quite tricky. Apart from limitations ...
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