[fpc-devel] bug: Inc(v,i)/Dec(v,i)

Hans-Peter Diettrich DrDiettrich at compuserve.de
Thu Jul 7 16:16:56 CEST 2005

Marcel Martin wrote:

> I think Marco is right. Basically, when the compiler has to
> code Inc(x,SomeConstant), the only sensible behaviour it is
> expected to have is to regard the constant as being of the
> type of x. So, if x is a Longword and if SomeConstant equals
> -1, either it adds $ffffffff (and there will be an overflow
> if x > 0) or it stops at compile time saying that -1 is not
> a Longword.

IMO the compiler can convert between Inc and Dec, for negative
constants, so that the value always is positive, compatible with
signed and unsigned data types.


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