[cfe-commits] Make -ftime-report produce a coarse breakdown of compilation phases (issue1683046)

[Daniel Dunbar]

Hi Reid,

I don't see any changes in Preprocessor.h other than to add #includes,
was that intentional?

Have you measured the impact of your changes on performance? I suspect
that is going to be prohibitive...

 - Daniel

On Fri, Jun 18, 2010 at 5:13 PM,  <reid.kleckner at gmail.com> wrote:
> Reviewers: ,
>
> Message:
> Please take a look.
>
> Description:
> I'm adding this because I would like to use it to profile clang over
> large project builds.  My plan is to thread -ftime-report through the
> build system and write a script to aggregate the output.
>
> Output looks like this for a hello world test case:
>
> $ Debug/bin/clang -ftime-report t.c -c -o t.o
> ...
>
> ===-------------------------------------------------------------------------===
>                             Compilation phase timers
> ===-------------------------------------------------------------------------===
>   Total Execution Time: 0.0360 seconds (0.0497 wall clock)
>
>    ---User Time---   --User+System--   ---Wall Time---  --- Name ---
>    0.0160 ( 44.4%)   0.0160 ( 44.4%)   0.0198 ( 39.8%)  Parsing and Sema
> Time
>    0.0120 ( 33.3%)   0.0120 ( 33.3%)   0.0187 ( 37.6%)  Lexing and
> Preprocessing Time
>    0.0040 ( 11.1%)   0.0040 ( 11.1%)   0.0071 ( 14.4%)  Machine Code
> Generation Time
>    0.0000 (  0.0%)   0.0000 (  0.0%)   0.0029 (  5.8%)  LLVM IR
> Generation Time
>    0.0040 ( 11.1%)   0.0040 ( 11.1%)   0.0012 (  2.5%)  LLVM IR
> Optimization Time
>    0.0360 (100.0%)   0.0360 (100.0%)   0.0497 (100.0%)  Total
>
>
> Please review this at http://codereview.appspot.com/1683046/show
>
> Affected files:
>   A     include/clang/Basic/PhaseTimeInfo.h
>   M     include/clang/Lex/Preprocessor.h
>   M     include/clang/Parse/Parser.h
>   M     include/clang/Sema/ParseAST.h
>   A     lib/Basic/PhaseTimeInfo.cpp
>   M     lib/CodeGen/BackendUtil.cpp
>   M     lib/CodeGen/CodeGenAction.cpp
>   M     lib/Frontend/FrontendAction.cpp
>   M     lib/Sema/ParseAST.cpp
>
>
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