Re: performance comparison of ARM 266 MHz vs i386 800 MHz

[Catalin Marinas <catalin.marinas@arm.com>]

Bill Allombert <ballombe@master.debian.org> wrote:
> On Wed, Oct 18, 2006 at 09:29:48AM -0400, Lennart Sorensen wrote:
>> So the answer really becomes, that if your software does no floating
>> point calculations, then the arm will be quite a fast chip, and
>> otherwise it will be very slow.  I would not be surprised if a 266mhz
>> arm is at least close to the performance of an 800mhz via eden when
>> doing integer calculations.
>
> Sorry to intervene but I am a bit surprised.
>
> As far as I remember, ARM has no 32x32->32 unsigned multiply and no
> 32x32->64 multiply. Am I wrong ?

MUL   is 32x32->32 both signed and unsigned

In architectures 4 and above:

UMULL is 32x32->64 unsigned
SMULL is 32x32->64 signed

-- 
Catalin