[gambit-list] Reducing the memory requirements to compile the C files generated by Gambit

Marc Feeley feeley at iro.umontreal.ca
Tue Feb 24 12:28:55 EST 2009


Could someone with a gcc 4.2 or 4.3 check that the new configure  
script (on the repository) detects these versions correctly and  
produces a message indicating that the -fno-move-loop-invariants  
option has been used automatically?

Marc

On 21-Feb-09, at 1:53 PM, Bradley Lucier wrote:

> Marc:
>
> The gcc 4.2.* and 4.3.* series compilers have a problem dealing with
> large "loops" that are "recognized" because of the computed gotos,  
> loops
> that consist of 50,000+ basic blocks in some instances.
>
> This has been "fixed" in the 4.4.* release by attempting
> loop-invariant-code-motion (LICM) at the register-transfer-language
> (RTL) level only for loops with fewer than 1,000 block at -O1 and  
> fewer
> than 10,000 blocks at -O2.  Perhaps this change will be backported to
> the released compiler series, but it hasn't happened yet.
>
> Some Linux distributions (e.g., Ubuntu 8.10, Fedora 10) ship 4.3.* or
> 4.2.* series compilers, and so they have a really hard time compiling
> some Gambit-generated programs with the default gcc options; e.g., the
> compiler benchmark takes about 29 GB of memory to compile on x86-64  
> with
> the default Gambit gcc options, see
>
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39157
>
> Can you add something to the configure script to see whether
> gcc-4.[23].* is being used and to add
>
> -fno-move-loop-invariants
>
> to the gcc options in that case?
>
> I added some comments about this to the wiki at
>
> http://dynamo.iro.umontreal.ca/~gambit/wiki/index.php/Configure_script_options
>
> Brad
>
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