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Re: [avr-gcc-list] Global variables and ISRs ???
From: |
David Brown |
Subject: |
Re: [avr-gcc-list] Global variables and ISRs ??? |
Date: |
Thu, 8 Sep 2005 13:01:24 +0200 |
----- Original Message -----
From: "Vincent Trouilliez" <address@hidden>
> > There's for sure a lot of potential for improvement, but declaring
> > something "top-priority" because that's your opinion won't do
> > anything. There are many similar minor improvements that could be
> > made, they probably sum up to maybe 10...20 % of possible savings if
> > really *all* of them were sorted out
>
> Really ? Sorry didn't realise that the H/W multiplier was of so little
> benefit when doing calculations... maybe Atmel could just remove it from
> their chip to sell them cheaper and/or free the space for some more
> useful peripheral then... :-)
> What could they replace it with mmmmm.... a few D/A converters would be
> fine... :-)
>
The hardware multiplier makes a difference when doing mulitplication, which
take a very small percentage of the run time of most real programs -
therefore, overall, it's a small issue. Obviously the hardware multiplier
is a lot faster than a software routine at the actual multiply, it's just
that it makes little difference to most programs as a whole.
- Re: [avr-gcc-list] Global variables and ISRs ???, (continued)
- Re: [avr-gcc-list] Global variables and ISRs ???, Alex Wenger, 2005/09/07
- Re: [avr-gcc-list] Global variables and ISRs ???, Vincent Trouilliez, 2005/09/07
- Re: [avr-gcc-list] Global variables and ISRs ???, David Brown, 2005/09/07
- Re: [avr-gcc-list] Global variables and ISRs ???, Joerg Wunsch, 2005/09/07
- Re: [avr-gcc-list] Global variables and ISRs ???, Vincent Trouilliez, 2005/09/07
- Re: [avr-gcc-list] Global variables and ISRs ???, Joerg Wunsch, 2005/09/07
- Re: [avr-gcc-list] Global variables and ISRs ???, Vincent Trouilliez, 2005/09/07
- Re: [avr-gcc-list] Global variables and ISRs ???,
David Brown <=
- Re: [avr-gcc-list] Global variables and ISRs ???, David Brown, 2005/09/08
- Re: [avr-gcc-list] Global variables and ISRs ???, E. Weddington, 2005/09/08
- Re: [avr-gcc-list] Global variables and ISRs ???, Galen Seitz, 2005/09/07
- Re: [avr-gcc-list] Global variables and ISRs ???, ericw, 2005/09/07
- Re: [avr-gcc-list] Global variables and ISRs ???, Joerg Wunsch, 2005/09/07
- Re: [avr-gcc-list] Global variables and ISRs ???, Vincent Trouilliez, 2005/09/07
- Re: [avr-gcc-list] Global variables and ISRs ???, Joerg Wunsch, 2005/09/07
- Re: [avr-gcc-list] Global variables and ISRs ???, Vincent Trouilliez, 2005/09/07
- Re: [avr-gcc-list] Global variables and ISRs ???, David Brown, 2005/09/07
- Re: [avr-gcc-list] Global variables and ISRs ???, Vincent Trouilliez, 2005/09/07