[llvm-bugs] [Bug 25482] Debug info not maintained in AutoFDO

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=25482

Dehao Chen <danielcdh at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|FIXED                       |---

--- Comment #6 from Dehao Chen <danielcdh at gmail.com> ---
The inline stack is still not maintained correctly in this bug. Here is how to
reproduce:

#bin/clang++ -c -fprofile-sample-use=c.txt -O2 -save-temps -v c.cc
#bin/opt -sample-profile -sample-profile-file=c.txt c.bc -S|bin/opt -analyze
-branch-prob
Printing analysis 'Branch Probability Analysis' for function '_Z3foov':
---- Branch Probabilities ----
  edge entry -> if.then.i probability is 0x50000000 / 0x80000000 = 62.50%
  edge entry -> if.else.i probability is 0x30000000 / 0x80000000 = 37.50%
  edge if.then.i -> _ZL3barv.exit probability is 0x80000000 / 0x80000000 =
100.00% [HOT edge]
  edge if.else.i -> _ZL3barv.exit probability is 0x80000000 / 0x80000000 =
100.00% [HOT edge]
Printing analysis 'Branch Probability Analysis' for function '_ZL3barv':
---- Branch Probabilities ----
  edge entry -> if.then probability is 0x50000000 / 0x80000000 = 62.50%
  edge entry -> if.else probability is 0x30000000 / 0x80000000 = 37.50%
  edge if.then -> if.end probability is 0x80000000 / 0x80000000 = 100.00% [HOT
edge]
  edge if.else -> if.end probability is 0x80000000 / 0x80000000 = 100.00% [HOT
edge]


#bin/clang++ -c -fprofile-sample-use=c.txt -O2 -save-temps -v c.cc -g
#bin/opt -sample-profile -sample-profile-file=c.txt c.bc -S|bin/opt -analyze
-branch-prob
Printing analysis 'Branch Probability Analysis' for function '_Z3foov':
---- Branch Probabilities ----
  edge entry -> if.then.i probability is 0x00000000 / 0x80000000 = 0.00%
  edge entry -> if.else.i probability is 0x80000000 / 0x80000000 = 100.00% [HOT
edge]
  edge if.then.i -> _ZL3barv.exit probability is 0x80000000 / 0x80000000 =
100.00% [HOT edge]
  edge if.else.i -> _ZL3barv.exit probability is 0x80000000 / 0x80000000 =
100.00% [HOT edge]
Printing analysis 'Branch Probability Analysis' for function '_ZL3barv':
---- Branch Probabilities ----
  edge entry -> if.then probability is 0x50000000 / 0x80000000 = 62.50%
  edge entry -> if.else probability is 0x30000000 / 0x80000000 = 37.50%
  edge if.then -> if.end probability is 0x80000000 / 0x80000000 = 100.00% [HOT
edge]
  edge if.else -> if.end probability is 0x80000000 / 0x80000000 = 100.00% [HOT
edge]


With and without "-g", branch-probability gives different branch probability
estimation for _Z3foov.

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