[LLVMbugs] [Bug 14947] New: error in backend: Cannot select: intrinsic %llvm.x86.sse42.crc32.64.64

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=14947

             Bug #: 14947
           Summary: error in backend: Cannot select: intrinsic
                    %llvm.x86.sse42.crc32.64.64
           Product: new-bugs
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: kcc at google.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


% cat crc.cc 
typedef unsigned long long U;
U foo(U x, U y) {
  return __builtin_ia32_crc32di(x, y);
}
% clang -cc1 -triple x86_64-unknown-linux-gnu -S -o - -x c++ crc.cc
    .file    "crc.cc"
fatal error: error in backend: Cannot select: intrinsic
%llvm.x86.sse42.crc32.64.64


(works well if I pass -march=native)

crc32 seems to be quite an old instruction, why does it require -march=native? 

Also, this should probably be a warning/error, not an assertion.

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