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Subject: Re: Integer divide
Date: Fri, 10 Jan 2003 00:46:13 +0000
References: <firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org> <email@example.com>
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"Frank Bemelman" wrote:
>Well, it was not just 1 division, but 10.000.000, see code:
>>For x = 1 To 10000000
>> y = Divide(A, x)
>330 mS / 10.000.000 -> 0.000000033 -> 33 nanosecond.
>and 27 nanosecond for the non-vb.
>Not *that* bad.
A version coded in C on an Athlon XP running at 1.875MHz took about 15.5ns
The non-function version complies to
It isn't easy to find instruction timings but the few I found for Pentiums
looked like 2 cycles for cdq and maybe 40 for idiv.
Looking at it you would think the function call and the two loops in the
function would add up to more than 42 cycles. Just shows how optimized
these processors are for common stuff.
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