[Bug tree-optimization/102232] New: Missed arithmetic fold

[llvm at rifkin dot dev via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102232

            Bug ID: 102232
           Summary: Missed arithmetic fold
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: llvm at rifkin dot dev
  Target Milestone: ---

LLVM optimizes bar into tgt here but not foo.

https://godbolt.org/z/nhEjaoanx

int foo(int a, int b) {
    return b * (1 + a / b) - a;
}
int bar(int a, int b) {
    return b * (a / b) + b - a;
}
int tgt(int a, int b) {
    return b - a % b;
}

LLVM appears to miss this too.