[llvm-bugs] [Bug 48553] New: Large compile-time regression after 8b1c4e310c2f

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=48553

            Bug ID: 48553
           Summary: Large compile-time regression after 8b1c4e310c2f
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Scalar Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: florian_hahn at apple.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 24302
  --> https://bugs.llvm.org/attachment.cgi?id=24302&action=edit
slow.bc

After 8b1c4e310c2f the compile-time for
`MultiSource/Benchmarks/MiBench/consumer-lame` dramatically increases with -O3
& LTO. 

The attached slow.bc has been reduced from the input with a time-limit of 30
seconds for opt. On current trunk, `bin/opt -O3 slow.bc` takes more than 30
seconds. With 8b1c4e310c2f reverted, it takes < 1 second.

I've not tried to run the full input until completion, so maybe it just takes a
very long time now.

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