<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/74563>74563</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Something wrong in PGOInstrumentationGen pass
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          hungryzzz
      </td>
    </tr>
</table>

<pre>
    ## Description

Hi, I set the `-fprofile-generate` option to enable the `PGOInstrumentationGen` pass and collect the function counts when execution.

But I find that a function whose profiling count is zero will be invoked during execution, I think maybe there is something wrong in `PGOInstrumentationGen` pass.

## Steps to reproduce
```bash
clang++ -fprofile-generate -O2 bubble_sort.cpp -o bubble
LLVM_PROFILE_FILE=default.profraw ./bubble
llvm-profdata merge -output=default.profdata *.profraw
llvm-profdata show --counts --function=_ZNSt14basic_ifstreamIcSt11char_traitsIcEEC1Ev ./default.profdata
```
The result of `llvm-profdata show` is as follows,  it shows that the total counts is zero which indicates that the function `_ZNSt14basic_ifstreamIcSt11char_traitsIcEEC1Ev` will not be executed.
```
Counters:
 _ZNSt14basic_ifstreamIcSt11char_traitsIcEEC1Ev:
    Hash: 0x07df0bf914dbeae5
    Counters: 4
    Block counts: [0, 0, 0, 0]
Instrumentation level: IR  entry_first = 0
Functions shown: 1
Total functions: 9
Maximum function count: 795760
Maximum internal block count: 31829604240
```
Then I use `gdb` to debug it, and find that the function `_ZNSt14basic_ifstreamIcSt11char_traitsIcEEC1Ev ` will be entered.
```bash
bash-4.4$ gdb -q ./bubble
Reading symbols from ./bubble...(no debugging symbols found)...done.
(gdb) r _ZNSt14basic_ifstreamIcSt11char_traitsIcEEC1Ev
Starting program: /export/users/zengruiy/xmain/test-input/mbfi/bubble _ZNSt14basic_ifstreamIcSt11char_traitsIcEEC1Ev
Missing separate debuginfos, use: yum debuginfo-install glibc-2.28-151.el8.x86_64
 iteration = 0
Bubble sorting array of 40000 elements
duration= 2.000000 ms
[Inferior 1 (process 3713690) exited normally]
Missing separate debuginfos, use: yum debuginfo-install libgcc-8.4.1-1.el8.x86_64 libstdc++-8.4.1-1.el8.x86_64
(gdb) quit
bash-4.4$ gdb -q ./bubble
Reading symbols from ./bubble...(no debugging symbols found)...done.
(gdb) b _ZNSt14basic_ifstreamIcSt11char_traitsIcEEC1Ev
Breakpoint 1 at 0x18e0
(gdb) r
Starting program: /export/users/zengruiy/xmain/test-input/mbfi/bubble
Missing separate debuginfos, use: yum debuginfo-install glibc-2.28-151.el8.x86_64
 /export/users/zengruiy/xmain/test-input/mbfi/bubble iteration(ex. 20). Will use default iteration(20)
 iteration = 20
Bubble sorting array of 40000 elements

Breakpoint 1, 0x00007ffff7b34fb0 in std::basic_ifstream<char, std::char_traits<char> >::basic_ifstream() () from /lib64/libstdc++.so.6
Missing separate debuginfos, use: yum debuginfo-install libgcc-8.4.1-1.el8.x86_64 libstdc++-8.4.1-1.el8.x86_64
```

## Environment
- llvm version: 06c5c27e44757e4917f7d7c995720ae8a2d3b1f9 (release)
- kernel version: 4.18.0-305.el8.x86_64

The test case is attached here.
[case.zip](https://github.com/llvm/llvm-project/files/13577063/case.zip)

</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJzMV0tv4zgS_jX0pSCBop4--BB34hkD3duDzmIX2EtAiSWJG4r0kFRi59cvKPmVx2LQ3Rigg0BKVF8V6_FVkeTOyU4jrki-Jvntgo--N3bVj7qzh5eXl0VtxGFFWEpYCrfoGit3XhpN6C2hN_Pzd0nYJ9iCQw--RyAFjdqdNa1UGHWo0XKPpKBgJlXwBlDzWuEJ_cdvX7faeTsOqD0PmN9QB4Uddw64FtAYpbCZzbejbiY7jRm1d_DcowbcYzOGr_G1Z-vRwxZaqQX4nnvgF-Xn3jiE2Uupu9kYSAcvaA08S6WgRpD6yTyiADHaADqvMgfse6kfYeCHegrFYtB3ZsAg6ODZGt2B1H8Z4iufj7m-97hzIVUWd9aIscGjuKDzb81dP39qFNcdYWvC1vA-8RB9ZVCPda3wwRnr42a3g8gcP80WPn_-15eHP7593Ww_3z2EB0lvBbZ8VD4O9ix_hpiwzbWOUk9DFISCew4D2g4hMqPfjf6N9gQg7OZk6iN915tniKJjSaPoVCeS3j785x_3Pslq7mTzIFvnLfJh29z7JGl6bh-85dK7bXN39ym5e5r8fLv6m9TN__6zR7DoRuXBtKFG7z0KBZIOuIPWKGWeXag7SD8J3cypQElvPFcnPp451MumB6mFbLjHK_SZg6Sg3xdc8GeipjY-0HPmI4r4wwA_BX_QOpIeqQXfudpZDwB-D3RLb4DuaSlaWrfLJBM1cswvmKsFIbt8XivTPB6zE0QkX9OQyOtHfjvj3zQJKHxCFZS23wBQe3t4aKV1Hkh6C8c4N8d8uqksOqCTY4mnupzyPS2-nCVf-F4O4_BmmARAuczLUwZPKBnC0lxBfQklYNOkYsuCZiyj_49iGrYwumnMdaIOBfQGBNZjB9KH2MN4u0yon-MHnAkSyBGcfs-Ny9wIf0VZnBGWQSdqiP581-TfkIswytxhqI1y0FozXIHiOCas0seAuldIM2pB2DKOY2E0nrxgVcgCW4L9XjJO-veeWx-W2VnTWT5MdGIb3O-M9YRtRhfoxzYvqDs7ygNhm_3ApSZs49H5SOownthmqFt5juKHPPkinZvixR2fxuyUAqlbMw2J0WHw7TAOF0EktfNcKeiUrJuIxayKkjyJUVXxvioeilPPSB8m98SAC8vXs69hhId1ubX8EAZXRimlgApD07gZK8ZZP6izmE4_MByFJF9vdYtWGgsJEFbtrGnQOUjLJC2WNFQH99KjAG3swJU6nNvzZ6JWsu6aJqriLE6i66iDxHnRzFvYB4C33PlzlP4XoHD9Q8RZW-SPOyO1hwS4B7pPKqTv2uNv5PvfT-Cfb8lzCxBW4T4GFmgZw7_DbAvj9LjDv8JNmA9biP1AD72v1rRT7QO0bNu2Les0a2saDnjOi7BZpjevmUDST4EGQe-MuOLFSZzeAUnvPjTAqkCG42tiLmEbJesim9-XtomdiYtfoElfb4CvjrR3-klao0OO5-8RhCMXPKF107C6AVo0ecNKzLIyLzFbJmVbirJZLvOSUY4VZyKtk3ZKiUWF3OG55hE8otWoru1lcVLFNEpp_t7T8yEw0BAa7qbjO_eeNz0KCOf5-Dwxgzh-kbswCVnVe7-bjlVsQ9imk74f67gxQyiKejq9wlnyv9gEcocTeWiCJM3LkhYpYZuzxZP_C7FKxTJd8gWukpImVcaKJF_0q0qkTYmUFQ1vhRDLljaizrJlJmhZLJt8IVeMsjRhtKAFTdM8FnlWcboUVZ2KtFwmJKM4cKni4FZsbLeQzo24KrO8SBeK16jcdANkTOMzTELCWLgQ2tUUSj12jmRUSefdxYqXXuHq_v2N58PrznTXWYxWrb47f5NHIYGTx_8LAAD__0hKsI4">