llvm dev - Jul 2012 - [LLVMdev] Does the pass -postdomfrontier exist?

Hi,

I found the -postdomfrontier pass in *llvm*.org/docs/Passes.html, but 
'opt' does not accept it. I could not find the relevant codes in 
PostDominance.cpp in SVN trunk, but I found some relevant codes  here 
http://opensource.apple.com/source/clang/clang-137/src/lib/Analysis/PostDominators.cpp.


I am wondering why this pass is removed and what should I do if I want 
the post dominance frontier information?

Thanks!

Hi,
> I found the -postdomfrontier pass in *llvm*.org/docs/Passes.html, but
> 'opt' does not accept it. I could not find the relevant codes in
> PostDominance.cpp in SVN trunk, but I found some relevant codes  here
>
http://opensource.apple.com/source/clang/clang-137/src/lib/Analysis/PostDominators.cpp.
>
>
> I am wondering why this pass is removed and what should I do if I want
> the post dominance frontier information?
there was some discussion of this on the mailing list already, so I suggest you
search the archives.

Ciao, Duncan.

On 07/13/2012 04:30 PM, Duncan Sands wrote:
> Hi,
>
>> I found the -postdomfrontier pass in *llvm*.org/docs/Passes.html, but
>> 'opt' does not accept it. I could not find the relevant codes
in
>> PostDominance.cpp in SVN trunk, but I found some relevant codes  here
>>
http://opensource.apple.com/source/clang/clang-137/src/lib/Analysis/PostDominators.cpp.
>>
>>
>> I am wondering why this pass is removed and what should I do if I want
>> the post dominance frontier information?
> there was some discussion of this on the mailing list already, so I suggest
you
> search the archives.
>
> Ciao, Duncan.
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
I searched the archives and found
http://llvm.1065342.n5.nabble.com/post-dominance-frontier-fix-td10221.html
http://llvm.1065342.n5.nabble.com/Is-there-a-control-dependence-graph-builder-td35919.html#a35921
http://llvm.1065342.n5.nabble.com/post-dominance-frontier-td6783.html

It seems none of them are relevant.  Could you give me more hints about 
this topic? Thanks!

> I found the -postdomfrontier pass in *llvm*.org/docs/Passes.html, but 
> 'opt' does not accept it. I could not find the relevant codes in 
> PostDominance.cpp in SVN trunk, but I found some relevant codes  here 
>
http://opensource.apple.com/source/clang/clang-137/src/lib/Analysis/PostDominators.cpp.
  LLVM 3.0 release note said postdomfrontier had been removed [1].

    The unused PostOrder Dominator Frontiers and LowerSetJmp passes
    were removed.

  I'll send patch to update the document.

Regards,
chenwj

[1] http://llvm.org/releases/3.0/docs/ReleaseNotes.html

-- 
Wei-Ren Chen (陳韋任)
Computer Systems Lab, Institute of Information Science,
Academia Sinica, Taiwan (R.O.C.)
Tel:886-2-2788-3799 #1667
Homepage: http://people.cs.nctu.edu.tw/~chenwj

On 07/13/2012 05:09 PM, 陳韋任 (Wei-Ren Chen) wrote:
>> I found the -postdomfrontier pass in *llvm*.org/docs/Passes.html, but
>> 'opt' does not accept it. I could not find the relevant codes
in
>> PostDominance.cpp in SVN trunk, but I found some relevant codes  here
>>
http://opensource.apple.com/source/clang/clang-137/src/lib/Analysis/PostDominators.cpp.
>    LLVM 3.0 release note said postdomfrontier had been removed [1].
>
>      The unused PostOrder Dominator Frontiers and LowerSetJmp passes
>      were removed.
>
>    I'll send patch to update the document.
>
> Regards,
> chenwj
>
> [1] http://llvm.org/releases/3.0/docs/ReleaseNotes.html
>
So it means the postdomfrontier algorithm in <3.0 version is correct, 
but it is removed because no one uses it. And I can add the codes to my 
personal code base for my personal use. Am I correct? Thanks!