[llvm-bugs] [Bug 47507] New: Failure to optimize pointer comparison related to pointer arithmetic

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=47507

            Bug ID: 47507
           Summary: Failure to optimize pointer comparison related to
                    pointer arithmetic
           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

_Bool f(char *a, char *b)
{
  return (a + 16 <= b) || (b + 16 <= a);
}

This can be optimized to `return (uintptr_t)((a + 15) - b) > 30;`. This
optimization is done by GCC, but not LLVM.

Comparison here : https://godbolt.org/z/Pex9Er

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