[all-commits] [llvm/llvm-project] b18bda: ARM: reuse existing libcall global variable if pos...

[Tim Northover via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b18bda67915c67285c2b8d5fb88210f9a7436b8c
      https://github.com/llvm/llvm-project/commit/b18bda67915c67285c2b8d5fb88210f9a7436b8c
  Author: Tim Northover <t.p.northover at gmail.com>
  Date:   2021-07-14 (Wed, 14 Jul 2021)

  Changed paths:
    M llvm/lib/Target/ARM/ARMFastISel.cpp
    M llvm/test/CodeGen/ARM/fast-isel-call.ll

  Log Message:
  -----------
  ARM: reuse existing libcall global variable if possible.

If we try to create a new GlobalVariable on each iteration, the Module will
detect the name collision and "helpfully" rename later iterations by appending
".1" etc. But "___udivsi3.1" doesn't exist and we definitely don't want to try
to call it.

So instead check whether there's already a global with the right name in the
module and use that if so.