[LLVMbugs] [Bug 17044] New: clang __sync_val_compare_and_swap hangs with 128 bit argument

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=17044

            Bug ID: 17044
           Summary: clang __sync_val_compare_and_swap hangs with 128 bit
                    argument
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Driver
          Assignee: unassignedclangbugs at nondot.org
          Reporter: jimix at pobox.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Using Ubuntu packages from: http://llvm.org/apt/
Raring (13.04) - Last update : Mon, 26 Aug 2013 22:03:40 UTC / Revision: 181323

$ clang -v
Ubuntu clang version 3.4-1~exp1 (trunk) (based on LLVM 3.4)
Target: x86_64-pc-linux-gnu
Thread model: posix
Found candidate GCC installation: /usr/bin/../lib/gcc/i686-linux-gnu/4.7
Found candidate GCC installation: /usr/bin/../lib/gcc/i686-linux-gnu/4.7.3
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/4.6
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/4.6.4
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/4.7
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/4.7.3
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.7
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.7.3
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7.3
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7
$ echo 'int foo() { __int128 a=0, b=0, c=0; return
__sync_val_compare_and_swap(&a, b, c); }' | clang -x c - -c -o foo.o

the command hangs.

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