* Re: number of vector template instances and pointers
[not found] <414EAD5B.C7A34222@innomed.hu>
@ 2004-09-20 15:40 ` Dan Kegel
2004-09-20 17:48 ` Joe Buck
0 siblings, 1 reply; 2+ messages in thread
From: Dan Kegel @ 2004-09-20 15:40 UTC (permalink / raw)
To: Fery; +Cc: crossgcc, GCC Mailing List
Fery wrote:
> When I create two vectors with different pointer types (e.g.
> vector<char*> and vector<int*>), gcc compiles in two instances of vector
> code. In SH architecture, it means cca. n * 10K of code, which is quite
> big in our project.
>
> The question is, can I somehow force the compiler to use the same code
> for the two template instances?
If the object code generated for the two is really identical,
then if you really wanted to, you could write a whole-program
optimizer pass that combined them.
This is a topic for the gcc or libstdc++ mailing lists, though,
where people actually know something about this, so I'm redirecting there.
- Dan
--
My technical stuff: http://kegel.com
My politics: see http://www.misleader.org for examples of why I'm for regime change
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: number of vector template instances and pointers
2004-09-20 15:40 ` number of vector template instances and pointers Dan Kegel
@ 2004-09-20 17:48 ` Joe Buck
0 siblings, 0 replies; 2+ messages in thread
From: Joe Buck @ 2004-09-20 17:48 UTC (permalink / raw)
To: GCC Mailing List; +Cc: Fery, crossgcc
Fery wrote:
> > When I create two vectors with different pointer types (e.g.
> > vector<char*> and vector<int*>), gcc compiles in two instances of vector
> > code. In SH architecture, it means cca. n * 10K of code, which is quite
> > big in our project.
> >
> > The question is, can I somehow force the compiler to use the same code
> > for the two template instances?
The answer at the moment is no.
On Mon, Sep 20, 2004 at 07:54:40AM -0700, Dan Kegel wrote:
> If the object code generated for the two is really identical,
> then if you really wanted to, you could write a whole-program
> optimizer pass that combined them.
It would be possible to refactor libstdc++ so that it uses the same
code for those functions of Container<POD> whose code only depends on
sizeof<POD>. Alternatively and more simply, there could be a
specialization just for Container<T*> that would use common code.
That work has not yet been done.
^ permalink raw reply [flat|nested] 2+ messages in thread
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[not found] <414EAD5B.C7A34222@innomed.hu>
2004-09-20 15:40 ` number of vector template instances and pointers Dan Kegel
2004-09-20 17:48 ` Joe Buck
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