[llvm-bugs] [Bug 42885] New: optimization bug with -march=haswell/skylake

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=42885

            Bug ID: 42885
           Summary: optimization bug with -march=haswell/skylake
           Product: clang
           Version: trunk
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: mail at hanicka.net
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org,
                    neeilans at live.com, richard-llvm at metafoo.co.uk

Created attachment 22337
  --> https://bugs.llvm.org/attachment.cgi?id=22337&action=edit
Problematic example

Optimizer for attached code generate suboptimal assembly when
`-march=haswell/skylake` (maybe others too) provided.

Example: https://compiler-explorer.com/z/hILOvf

But for another example the assembly is ok:
https://compiler-explorer.com/z/bdOObm

Thanks, Hana

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