I think in normal manual calculation multiplying 23.2345666 e+23  *
.987324345 e-47  is much more complex than  multiplying  234567890 *
9808756.
The thing is that in fixed point you are limiting the size and the the
processor does not take care of decimal point and the exponent. The
desing of hardware is simple and hence when it runs the speed is more.
Dspwhiz

To simplify greatly:  all other things being equal, the larger and more complex
the logic, the slower it will operate.  The logic required to implement floating
point math is more complex than that required to implement fixed point math.

This same fact is also the reason that floating point DSPs typically consume
more power than their fixed point counterparts (again, assuming all other things
are equal, which they never are!).

-- 
Jon Harris

SPAM blocked e-mail address in use.  Replace the ANIMAL with 7 to reply.
"abhi_15sep" <abhi_15sep@yahoo.com> wrote in message
news:6YGdnQtpqfZQw_vfRVn-3A@giganews.com...
> i had searched on internet but i am unable to find...WHY FIXED POINT
> PROCESSOR HAS HIGHER CLOCK SPEED THAN FLOATING POINT PROCESSOR?
> regards
> abhishek

On Wed, 20 Apr 2005 08:53:17 -0500, abhi_15sep wrote:

> i had searched on internet but i am unable to find...WHY FIXED POINT
> PROCESSOR HAS HIGHER CLOCK SPEED THAN FLOATING POINT PROCESSOR?
> regards

"Why" is often a really difficult question to answer in general terms, but
here's a stab at it.

Roughly: floating point arithmetic takes more effort than fixed point:
there are the extra steps of normalizing and so on.  There are also a
bunch of exceptional conditions to catch and do something about.

Consequently, floating point units tend to be bigger and slower than their
fixed point (i.e., integer) brethren.  Clock speed follows more or less
directly from that.

Cheers,

-- 
Andrew

i had searched on internet but i am unable to find...WHY FIXED POINT
PROCESSOR HAS HIGHER CLOCK SPEED THAN FLOATING POINT PROCESSOR?
regards
abhishek


		
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