On 2001-02-01 16:12, Daniel Jungmann <DSJ### [at] gmxnet> wrote:
>For 1 I need not to rewrite the compiler, I need to write a lot of macros
>( not exactly the same, a lot of work) and I need to analyse the source
>code, because the code must bee "parallel" so the SIMD instructions can
>work.

No, this was possibility number 2, not 1. Please read what people write,
or ask if something isn't expressed clearly enough.

Number 1 was the ideal case where you don't have to change the source
code at all, because the compiler is smart enough to figure out inherent
parallelisms.

Number 2 was the less ideal case, where the compiler knows about SIMD
instructions, but can use them only if the code is arranged in a certain
way. 

In reality, early versions of optimizers will recognize only a few
constructs (situation number 2), and each successive version will
recognize a few more. At the same time, programmers will adapt their
programming style to the capabilities of the optimizers, so the
situation will asymptotically approach situation number 1.

	hp

-- 
   _  | Peter J. Holzer    | All Linux applications run on Solaris,
|_|_) | Sysadmin WSR       | which is our implementation of Linux.
| |   | hjp### [at] wsracat      | 
__/   | http://www.hjp.at/ |	-- Scott McNealy, Dec. 2000

Post a reply to this message