[llvm-bugs] [Bug 33863] New: _Atomic _Bool decrement gives infinite loop

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=33863

            Bug ID: 33863
           Summary: _Atomic _Bool decrement gives infinite loop
           Product: clang
           Version: 4.0
          Hardware: PC
                OS: MacOS X
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: mib.bugzilla at gmail.com
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org

clang -v
clang version 4.0.1 (tags/RELEASE_401/final)
Target: x86_64-apple-darwin14.4.0
Thread model: posix
InstalledDir:
/site/spt/usr8/mblower/bin/clang+llvm-4.0.1-x86_64-apple-macosx10.9.0/bin
sptem26:_test mblower$ cat tm.c
void
test_minus (void)
{
 _Atomic _Bool a = 0;
 _Bool b = 1;
 _Atomic _Bool c = 1;
 a -= b; // Test completes OK if this line is removed.
 a -= c;
}

int main(void)
{
test_minus ();
}

I adapted this testcase from gcc testsuite. Execution of the 2nd decrement
doesn't complete. It works OK without the first decrement.
--Melanie Blower (I work for Intel on the Intel c++ compiler)

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