[llvm-bugs] [Bug 37019] New: Undefined behavior in CFGPrinter due to Twine misuse

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=37019

            Bug ID: 37019
           Summary: Undefined behavior in CFGPrinter due to Twine misuse
           Product: libraries
           Version: trunk
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Global Analyses
          Assignee: unassignedbugs at nondot.org
          Reporter: siu at continuum.io
                CC: llvm-bugs at lists.llvm.org

The Twine usage in include/llvm/Analysis/CFGPrinter.h#L175

(https://github.com/llvm-mirror/llvm/blob/433eb70569ee6379cdd5181e72b9193fdb0a39dd/include/llvm/Analysis/CFGPrinter.h#L175)
is leading to an undefined behavior bug when LLVM is compiled with O2.  The
error can be observed with `opt -dot-cfg` on a function that contains
branch-weight.  The output DOT file will be corrupted.

Llvmlite has patched LLVM with https://github.com/numba/llvmlite/pull/343.  The
PR also contains test to replicate the problem.

-- 
You are receiving this mail because:
You are on the CC list for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-bugs/attachments/20180405/18a2019b/attachment.html>