[Bug tree-optimization/102974] New: GCC optimization is very poor for add carry and multiplication combos

[unlvsur at live dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102974

            Bug ID: 102974
           Summary: GCC optimization is very poor for add carry and
                    multiplication combos
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: unlvsur at live dot com
  Target Milestone: ---

GCC:
https://godbolt.org/z/6sc6v5YcG

clang:
https://godbolt.org/z/eP8fTrWzd
msvc:
https://godbolt.org/z/snzoEe5he
GCC generates 16 more instructions than msvc and clang for carry flag
optimizations.