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Re: [PATCH][C++] Fix PR29433, make C++ use a lot less time/memory


On Nov 28, 2006, at 8:18 AM, Richard Guenther wrote:
This patch is the Nth try to attack the problems around classtype_mangled_name

Sounds like a very worth while goal.


so, if you compile the testcase with -O0 you end up with a maximum virtual memory usage of around 2.5GB

:-( Ouch.


if you add -g to that it'll jump to 3.9GB (because dwarf2out.c thinks xstrduping all identifiers again is a good idea).

Hum... Would be nice to teach dwarf to use gc so that it never has to xstrdup a C++ symbol name. It the original radar doesn't cover dwarf, want to file one for it?


Mike, it looks like you invented mangle_class_name_for_template

I did? Why you think that? I would have thought Ken Raeburn did. I tried to fetch the bits from svn/cvs/oldgcc but didn't find bits old enough. :-( I didn't think I did up that code.


Would be nice to revisit mangling in general and maybe come up with tree style representation instead that doesn't use much space, brownie points for teaching the assembler and linker to deal with them as well.


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