[LLVMbugs] [Bug 9675] New: Calling __sync_sub_and_fetch with -mno-sse and -O0 crashes clang

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=9675

           Summary: Calling __sync_sub_and_fetch with -mno-sse and -O0
                    crashes clang
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: bruce.cran at gmail.com
                CC: llvmbugs at cs.uiuc.edu


Building code that calls __sync_sub_and_fetch with -mno-sse and -O0 causes
clang to crash with "Cannot emit physreg copy instruction" in
lib/Target/X86/X86InstrInfo.cpp:2011

int main(int argc, char **argv)
{
  int i = 1;
  __sync_sub_and_fetch(&i, 1);
  return 0;
}

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