[fpc-devel] avr port: rtl, unit system
georg at ghgrp.com
Sun Apr 26 23:39:03 CEST 2015
I started to implement parts of the rtl system unit for avr in
assembler. First results are encouraging: fpc_move takes 29 opcodes
compared to 104 of the Pascal version already optimized for the
platform, and 23:150 for fpc_mul_word.
Of course, I want to be as efficient as possible in this task, and first
convert routines that are either
- called often, to reduce execution time, or
- linked into most binaries, to reduce code size.
I made my own priority list, starting with the essential string routines
and arithmetic helpers, but due to lack of experience I certainly
overlooked things or overestimated others. So, question to everybody:
Which are according to your experience / opinion the library routines
that profit most from being implemented in assembler, considering an
embedded environment? (so, nothing about file I/O, system call wrappers,
Thanks for a lot of answers....
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