[llvm-bugs] [Bug 32767] New: JIT time is incredibly slow for the following bytecode on Windows 10 with AMD Ryzen R7 1700X

[via llvm-bugs]

http://bugs.llvm.org/show_bug.cgi?id=32767

            Bug ID: 32767
           Summary: JIT time is incredibly slow for the following bytecode
                    on Windows 10 with AMD Ryzen R7 1700X
           Product: new-bugs
           Version: 4.0
          Hardware: PC
                OS: other
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: bique.alexandre at gmail.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 18338
  --> http://bugs.llvm.org/attachment.cgi?id=18338&action=edit
Problematic LLVM IR

Hi,

I'm a Bitwig Studio developer (www.bitwig.com), and we use LLVM to JIT some
digital signal processing algorithms. Our software is used by thousand of
customers on Windows, Mac and Linux.

We just updated from LLVM 3.9.1 to LLVM 4.0 and found that it takes a lot of
time to JIT the attached LLVM IR (48701ms) on AMD Ryzen R7 1700X, while it is
not noticeable on other architectures.

The command "opt -mcpu=znver1 /home/abique/downloads/claes-cache-entry.ll -o
tutu.bc -O3" is instant, so it is slow in the target lowering or in the JIT
phase. 

By the way, do you have a workaround for this issue until the fix is released?

Many thanks.

Regards,
Alexandre

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