[llvm-bugs] [Bug 26446] New: std::numeric_limits<long double>::max_digits10 massively wrong for ppc

via llvm-bugs llvm-bugs at lists.llvm.org
Tue Feb 2 18:02:11 PST 2016


https://llvm.org/bugs/show_bug.cgi?id=26446

            Bug ID: 26446
           Summary: std::numeric_limits<long double>::max_digits10
                    massively wrong for ppc
           Product: libc++
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: richard-llvm at metafoo.co.uk
                CC: llvm-bugs at lists.llvm.org, mclow.lists at gmail.com
    Classification: Unclassified

libc++ thinks that std::numeric_limits<long double>::max_digits10 is 33 for
ppc64-linux. However, both DBL_MAX + DBL_DENORM_MIN and DBL_MAX +
DBL_DENORM_MIN*2 can be exactly represented by a PPC double double, and you
need around 633 decimal digits to distinguish those two values.

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