[llvm-bugs] [Bug 27176] New: mregparm=3 causes 'ran out of registers during register allocation'

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=27176

            Bug ID: 27176
           Summary: mregparm=3 causes 'ran out of registers during
                    register allocation'
           Product: clang
           Version: 3.8
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++11
          Assignee: unassignedclangbugs at nondot.org
          Reporter: js at alien8.de
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org
    Classification: Unclassified

Created attachment 16146
  --> https://llvm.org/bugs/attachment.cgi?id=16146&action=edit
Preprocessed source that triggers the error

With the attached source the command below triggers a fatal error in clang (ran
out of registers during register allocation). This was reproduced using clang
3.7 from Fedora 23 and clang 3.8 (Fedora 23 x86_64) from
http://llvm.org/releases/download.html

% clang++ -mregparm=3 -m32 -std=c++11 -O1 -c crash.cpp

fatal error: error in backend: ran out of registers during register allocation
clang-3.8: error: clang frontend command failed with exit code 70 (use -v to
see invocation)
clang version 3.8.0 (tags/RELEASE_380/final)
Target: i386-unknown-linux-gnu
Thread model: posix
InstalledDir: /tmp/clang+llvm-3.8.0-x86_64-fedora23/bin
clang-3.8: note: diagnostic msg: PLEASE submit a bug report to
http://llvm.org/bugs/ and include the crash backtrace, preprocessed source, and
associated run script.
clang-3.8: note: diagnostic msg: 
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang-3.8: note: diagnostic msg: /tmp/crash-10f03c.cpp
clang-3.8: note: diagnostic msg: /tmp/crash-10f03c.sh
clang-3.8: note: diagnostic msg:

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