[Bug tree-optimization/128605] New: [14/15/16 Regression] wrong code: niter bit count idioms (clz/ctz/popcount) take the start value from the wrong header PHI

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=128605

            Bug ID: 128605
           Summary: [14/15/16 Regression] wrong code: niter bit count
                    idioms (clz/ctz/popcount) take the start value from
                    the wrong header PHI
           Product: gcc
           Version: 17.0
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ktkachov at gcc dot gnu.org
  Target Milestone: ---

Filing this to keep track of backports of
g:65b6b8d2063605aa0ccbfa1379b7c0d6033f8e5a to affected branches