[Bug c++/114853] New: Inefficient code with a bunch of bitwise checks

[gh228df at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114853

            Bug ID: 114853
           Summary: Inefficient code with a bunch of bitwise checks
           Product: gcc
           Version: 13.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gh228df at gmail dot com
  Target Milestone: ---

Here is a compiler explorer link https://godbolt.org/z/WccxhnTfK, the first
function is 'inefficient' while the second function does the same while having
1/2 assembly lines of the first function and will probably run faster in some
cases. The problem is that the compiler doesnt generate negated constant once
in the start but rather keeps generating it over and over again before every
check which is very inefficient