Re: [Gomp-discuss] A Simple PThread Example of OpenMP

[Biagio Lucini]

Hi Scott - Thanks for the example. It is a nice start for a "proof of 
concept". The point is now what we should do? Essentially, in my mind the 
alternatives are:
a) transform s2s 
b) act on trees and make the omp example look like the pthread generated one

To my mind, the second should be easier, but I have the problem that I don't 
know very well gcc trees. The problems I see concern propagation of the 
variables: when we transform the code (whatever that will mean in the end) we 
will have to take the code between braces following a pragma and change it 
into a function, which should know the type of the different variables (being 
an independent function). Is there an easy way of getting that from the 
symbol table? Also, how do we modify the symbol table in such a way that we 
can allocate copies of the private variables for each thread?

Question for the middle-ender: we have said several times that the same 
optimisation procedures that work for serial code do not work for parallel 
code. Now, what does the gcc middle-end currently do with pthreaded programs? 
Just skip optimisation?

Cheers
Biagio

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Biagio Lucini                                 
Institut Fuer Theoretische Physik
ETH Hoenggerberg      
CH-8093 Zuerich - Switzerland           
Tel. +41 (0)1 6332562  
 
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