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Re: [avr-gcc-list] Trouble with division
From: |
Ulrich Schweitzer |
Subject: |
Re: [avr-gcc-list] Trouble with division |
Date: |
Mon, 16 Jun 2003 18:37:42 +0200 |
User-agent: |
KMail/1.4.3 |
On Sunday 15 June 2003 21:04, Joerg Wunsch wrote:
> Second, in particular division (but also software multiplication)
> heavily depends on the operands, so no single cycle count can be
> given. Ulrich already noticed that division by a power of two goes a
> lot faster than division by other numbers. So the worst case has to
> be timed if someone is interested (or just time the divisors you're
> interested in).
Of course divison by a power of two is very fast because it is just a bit
shift and not really a division. Other than that, is a division really
that operand-dependend?
Ulrich
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