[LLVMbugs] [Bug 6431] New: incorrect significand bits in __builtin_nan

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=6431

           Summary: incorrect significand bits in __builtin_nan
           Product: clang
           Version: trunk
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P5
         Component: -New Bugs
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: gohman at apple.com
                CC: llvmbugs at cs.uiuc.edu


For this code:

double NaN = __builtin_nan("1");

GCC and llvm-gcc emit this:
    .quad    9221120237041090561
aka 0x7ff8000000000001.

Clang emits this:
    .quad    9218868441522372607
aka 0x7ff00000ffffffff.

The GCC manual section "Other Builtins" explicitly specifies how the string in
__builtin_nan is interpreted.

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