Kristof Umann 9d6c4402c6 [analyzer] ConversionChecker: handle floating point ...

Extend the alpha.core.Conversion checker to handle implicit converions
where a too large integer value is converted to a floating point type. Each
floating point type has a range where it can exactly represent all integers; we
emit a warning when the integer value is above this range. Although it is
possible to exactly represent some integers which are outside of this range
(those that are divisible by a large enough power of 2); we still report cast
involving those, because their usage may lead to bugs. (For example, if 1<<24
is stored in a float variable x, then x==x+1 holds.)

Patch by: Donát Nagy!

Differential Revision: https://reviews.llvm.org/D52730

llvm-svn: 347006

2018-11-16 01:00:55 +00:00

6.9 KiB

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