Евгений Пермяков <permea...@gmail.com> писал в своём письме Mon, 30 Jul
2012 09:47:48 +0300:
Can someone tell me if there are any primitives, that used to detect
machine type overflows, in ghc haskell ? I perfectly understand, that I
can build something based on preconditioning of variables, but this will
kill any performance, if needed.
In GHC.Prim — primitives addIntC# and subIntC#:
addIntC# :: Int# -> Int# -> (#Int#, Int##)
Add with carry. First member of result is (wrapped) sum; second member
is 0 iff no overflow occured.
subIntC# :: Int# -> Int# -> (#Int#, Int##)
Subtract with carry. First member of result is (wrapped) difference;
second member is 0 iff no overflow occured.
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