[LLVMbugs] [Bug 409] NEW: ConstantFP::isValueValidForType Broken

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.cs.uiuc.edu/bugs/show_bug.cgi?id=409

           Summary: ConstantFP::isValueValidForType Broken
           Product: libraries
           Version: 1.0
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Core LLVM classes
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: rspencer at x10sys.com


This method will happily accept double values for float constants that are
clearly out of range or have precision beyond the acceptable precision of a
float. The current implementation accepts all double values as valid for float.
It shouldn't do that.

Simply casting double -> float -> double and comparing the two doubles doesn't
work well as a test because of rounding errors and/or conversion errors from
decimal notation in AsmParser. Hex conversions work fine as long as the value is
a valid FP double.



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