[llvm-bugs] [Bug 50628] New: Test taking longer to compiler after upstream commit 9d070b2f4889887f

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=50628

            Bug ID: 50628
           Summary: Test taking longer to compiler after upstream commit
                    9d070b2f4889887f
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: douglas_yung at playstation.sony.com
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org

Created attachment 24932
  --> https://bugs.llvm.org/attachment.cgi?id=24932&action=edit
test-timeout.cpp

The time it takes to require one of our internal tests recently jumped from
about 1 second to roughly 30 seconds after upstream change
9d070b2f4889887f9ce497592ef01df7b9601a1c.

To reproduce the issue, build the attached file test-timeout.cpp with "-S -g"
on a Windows hosted compiler targeting the PS4 (--target=x86_64-scei-ps4).
Those two options seem critical to reproduce the compilation slowdown.

Comparing the time reports before and after they look similar, the main
difference that the PrintModulePass goes from taking a fraction of a second
(0.1679 wall time to 33.9767)

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