• Per =?UTF-8?B?Tm9yZGzDtnc=?= (6/6) Feb 22 2020 We're looking for a way to speed up compilation of template-heavy
• Dennis (2/4) Feb 22 2020 The -vcg-ast flag does that.
• drathier (3/8) Feb 22 2020 The d.cg files still contain templates, so it appears like
• Stefan Koch (6/15) Feb 22 2020 no. -vcg-ast runs directly before codegen.
• drathier (4/9) Feb 23 2020 Thanks, I didn't even consider the possibility of a compiler
• Stefan Koch (4/10) Feb 22 2020 I have patches which add some tracing functionality.
• Seb (2/8) Feb 22 2020 https://github.com/CyberShadow/dmdprof

Per =?UTF-8?B?Tm9yZGzDtnc=?= <per.nordlow gmail.com> writes:

We're looking for a way to speed up compilation of template-heavy 
code. So we are trying to find out which parts of the code that 
is most costly to compile.

Is there a dmd flag that shows the code after template 
instantiations has been performed? Or some other dmd flag that 
can help out finding hot-spots in the compiler in our case.

Dennis <dkorpel gmail.com> writes:

On Saturday, 22 February 2020 at 11:26:19 UTC, Per Nordlöw wrote:
 Is there a dmd flag that shows the code after template 
 instantiations has been performed?

The -vcg-ast flag does that.

drathier <forum.dlang.org fi.fo> writes:

On Saturday, 22 February 2020 at 11:53:38 UTC, Dennis wrote:
 On Saturday, 22 February 2020 at 11:26:19 UTC, Per Nordlöw 
 wrote:
 Is there a dmd flag that shows the code after template 
 instantiations has been performed?

 The -vcg-ast flag does that.

The d.cg files still contain templates, so it appears like 
they're instantiated after -vcg-ast?

Stefan Koch <uplink.coder googlemail.com> writes:

On Saturday, 22 February 2020 at 12:24:56 UTC, drathier wrote:
 On Saturday, 22 February 2020 at 11:53:38 UTC, Dennis wrote:
 On Saturday, 22 February 2020 at 11:26:19 UTC, Per Nordlöw 
 wrote:
 Is there a dmd flag that shows the code after template 
 instantiations has been performed?

 The -vcg-ast flag does that.

 The d.cg files still contain templates, so it appears like 
 they're instantiated after -vcg-ast?

no. -vcg-ast runs directly before codegen.
All ast-rewriteing has already happend at that point.
The reason it contains the template declarations is because they 
are still in the ast.
There is no point in removing them.

drathier <forum.dlang.org fi.fo> writes:

On Saturday, 22 February 2020 at 17:44:52 UTC, Stefan Koch wrote:
 no. -vcg-ast runs directly before codegen.
 All ast-rewriteing has already happend at that point.
 The reason it contains the template declarations is because 
 they are still in the ast.
 There is no point in removing them.

Thanks, I didn't even consider the possibility of a compiler 
mutating the ast in-place. Spent too much time writing Haskell, I 
guess.

Stefan Koch <uplink.coder googlemail.com> writes:

On Saturday, 22 February 2020 at 11:26:19 UTC, Per Nordlöw wrote:
 We're looking for a way to speed up compilation of 
 template-heavy code. So we are trying to find out which parts 
 of the code that is most costly to compile.

 Is there a dmd flag that shows the code after template 
 instantiations has been performed? Or some other dmd flag that 
 can help out finding hot-spots in the compiler in our case.

I have patches which add some tracing functionality.
Another approach is to throw the -v flag and just count which 
semantic steps seem to take a long time.

Seb <seb wilzba.ch> writes:

On Saturday, 22 February 2020 at 11:26:19 UTC, Per Nordlöw wrote:
 We're looking for a way to speed up compilation of 
 template-heavy code. So we are trying to find out which parts 
 of the code that is most costly to compile.

 Is there a dmd flag that shows the code after template 
 instantiations has been performed? Or some other dmd flag that 
 can help out finding hot-spots in the compiler in our case.

https://github.com/CyberShadow/dmdprof