[cfe-dev] APFloat::toString() handling of MS FLT_MAX and DBL_MAX

Matthieu Brucher matthieu.brucher at gmail.com
Mon Apr 15 15:04:16 PDT 2013


Nothing to do with clang, but why didn't the code use numeric_limits?


2013/4/15 Will Wilson <will at indefiant.com>

> Hi All,
> I'm rewriting MS C++ code via clang and have an issue involving the
> printed representations of FLT_MAX and DBL_MAX. In both cases the printed
> literals exceed the inputs.
> From MS float.h:
> #define DBL_MAX         1.7976931348623158e+308
> // Becomes 1.797693134862316E+308
> #define FLT_MAX         3.402823466e+38F
> // Becomes 3.4028235E+38F
> Rewriting the values leads to compilation errors due to the literals
> exceeding their maximums. This doesn't altogether surprise me given the
> nature of FP arithmetic and string conversion but I was wondering if this
> could/should be treated as a bug given the significance of these values?
> - Will.
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