[llvm-bugs] [Bug 40986] New: After r342578, excessive compile time building opencollada

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=40986

            Bug ID: 40986
           Summary: After r342578, excessive compile time building
                    opencollada
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: dimitry at andric.com
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org

Created attachment 21571
  --> https://bugs.llvm.org/attachment.cgi?id=21571&action=edit
Unreduced test case for opencollada compiler hang

As reported in https://bugs.freebsd.org/236313, building the opencollada port
(see also <https://github.com/KhronosGroup/OpenCOLLADA>) takes an excessive
amount of compile time when -O2 is enabled.

Bisection shows this increase in compile time was introduced by
https://reviews.llvm.org/rL342578 ("[X86] Handle COPYs of physregs better
(regalloc hints)").

I'm attaching the full original test case (8.9M .cpp file, ~231k lines) for
now, since reducing it is rather time consuming.

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