[Bug tree-optimization/123120] New: phiprop does not always work

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123120

            Bug ID: 123120
           Summary: phiprop does not always work
           Product: gcc
           Version: 16.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: enhancement
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pinskia at gcc dot gnu.org
  Target Milestone: ---

Take:
```
#include <algorithm>

long f0(short c, short d, long long a)
{
   return std::max(std::min((long long)3, a), (long long)d);
}

long f1(short c, short d, long long a)
{
   return std::max((long long)d, std::min((long long)3, a));
}
```

depending on the order of argument execution (x86_64 is different from
aarch64/riscv), only one of f0 or f1 gets optimized in phiopt1 to min/max.

I thought I saw a duplicate but I can't find it right now.