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[avr-libc-dev] -O3 is bad
From: |
Joerg Wunsch |
Subject: |
[avr-libc-dev] -O3 is bad |
Date: |
Mon, 14 Oct 2002 18:24:10 +0200 |
User-agent: |
Mutt/1.2.5i |
-O3 is quite often a pessimization in our case. It causes a good deal
of code bloat, and although i didn't measure any possible speed
improvement, i guess there won't be much if any. Is there any
particular reason for chosing it for the avr4/avr5 architectures?
With -O3, vfprintf() compiles into > 1300 bytes on avr5, while with
-O1 -mcall-prologues -mno-tablejump, it's about 1100 bytes.
--
J"org Wunsch Unix support engineer
address@hidden http://www.interface-systems.de/~j/
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