[LLVMbugs] [Bug 15621] New: __builtin_popcount should be constexpr

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Thu Mar 28 17:09:15 PDT 2013


            Bug ID: 15621
           Summary: __builtin_popcount should be constexpr
           Product: clang
           Version: 3.2
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++11
          Assignee: unassignedclangbugs at nondot.org
          Reporter: steveire at gmail.com
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

    case __builtin_popcountll(2):
      return 1;
      return 0;

$ g++ -std=c++11 main.cpp
$ clang++ -std=c++11 main.cpp
main.cpp:228:10: error: case value is not a constant expression
    case __builtin_popcountll(2):
1 error generated.

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