https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89889

            Bug ID: 89889
           Summary: worse code compared to clang with alloca()
           Product: gcc
           Version: 9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: john.boyer at tutanota dot com
  Target Milestone: ---

Example: https://godbolt.org/z/MLZAA6.

Why is the push/lea/leave necessary? Shouldn't modifying the stack pointer be
enough?

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