[llvm-bugs] [Bug 48411] New: Failure to optimize out loop that does nothing and always ends

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=48411

            Bug ID: 48411
           Summary: Failure to optimize out loop that does nothing and
                    always ends
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Scalar Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: gabravier at gmail.com
                CC: llvm-bugs at lists.llvm.org

void foo(unsigned short int x, unsigned char y) {
  unsigned char *a = &y;

  while (y < 3) {
    if (x != 0)
      ++y;
    ++y;
  }
}

This can be optimized out. GCC does this optimization, but LLVM does not.

Comparison here : https://godbolt.org/z/cM4bj8

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