[llvm-bugs] [Bug 45789] New: Inlining threshold calculation is non-deterministic

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=45789

            Bug ID: 45789
           Summary: Inlining threshold calculation is non-deterministic
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: yikong at google.com
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org

Created attachment 23438
  --> https://bugs.llvm.org/attachment.cgi?id=23438&action=edit
Reproduce script

We identified that libpdfium build is non-deterministic. This only seems to
reproduce on Ubuntu 14.04 and 16.04, while always produces consistent result on
Ubuntu 18.04. The first point of divergence is in the Inliner pass, and the
difference is that the calculated inlining threshold for `_ZN1kD2Ev` being
different.

== 6ffcaa ==
/tmp/test/cpdf_image.cpp:31:24: remark: _ZN1kD2Ev not inlined into
_ZN10CPDF_Image1qEv because too costly to inline (cost=45, threshold=45)
[-Rpass-missed=inline]
== e995bd ==
/tmp/test/cpdf_image.cpp:31:24: remark: _ZN1kD2Ev inlined into
_ZN10CPDF_Image1qEv with (cost=45, threshold=325) [-Rpass=inline]

Reproduce script based on Docker is attached.

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