Lpc2000

Hi "geno" and Charles,


> I'm not sure I believe some of these numbers. For example, the 32-bit 
> subtraction should be way faster on an ARM. I hunch that a lot of time 
> is being chewed up by looping overheads or saving/storing the values 
> (something that is often optimised out in real code) or some other 
> time waster.

I concur here....
For example :




Test                      Philips               Atmel AVR          Microchip   TI
                            LPC2106            (ATMega323)     PIC18F452   MSP430F449
                            Flash[RAM]

32bit multiply        10.4µs [8.76µs]    180µs                 344µs         182µs


I find it doubtful that an ATMega takes the same amount of time for a 32 bit multiply as MSP430.
(Assuming the same clocks)
F449 has a 16X16 HW multiply, and AVR has only 8X8 (fract) multiply, notwithstanding the 8 vs. 16 bit architecture.
That is also assuming that a 16 X 16 into 32 bit multiply is intended.
Probably the HW MUL wasn't used on MSP430 ..... silly, since ARM has such an instruction, it should be a fair
equation that HWMUL is used.

-- Kris


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