[llvm-bugs] [Bug 48818] New: llvm-cov: wrong coverage for multiple calling a function with conditional operator statement

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=48818

            Bug ID: 48818
           Summary: llvm-cov: wrong coverage for multiple calling a
                    function with conditional operator statement
           Product: Runtime Libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: libprofile library
          Assignee: unassignedbugs at nondot.org
          Reporter: yangyibiao at nju.edu.cn
                CC: llvm-bugs at lists.llvm.org

Consider this case:
...
$ cat small.c
int f(int i)
{
  int r = (i-1) > 0 ? i : 0;
  return r;
}

int main()
{
  f(1);
  f(2);
}
...

$ clang -O0 -w -fcoverage-mapping -fprofile-instr-generate=small.profraw
small.c; ./a.out; llvm-profdata merge small.profraw -o small.profdata; llvm-cov
show a.out -instr-profile=small.profdata small.c > small.c.lcov; cat
small.c.lcov
    1|       |int f(int i)
    2|      2|{
    3|      1|  int r = (i-1) > 0 ? i : 0;
    4|      2|  return r;
    5|      2|}
    6|       |
    7|       |int main()
    8|      1|{
    9|      1|  f(1);
   10|      1|  f(2);
   11|      1|} 
   12|       |

...

We can found that Line #3 is wrongly marked as execute 1 times. Line #3 should
be executed 2 times.

...
$ clang --version
Ubuntu clang version
12.0.0-++20210117052627+ed396212da41-1~exp1~20210117163329.287
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin

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