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Re: unsigned / double propagation weirdness?


On 24-feb-04, at 13:23, Robert Dewar wrote:

Joe Buck wrote:

So the warning would only be generated if an unsigned negation is
widened (or potentially widened, in the case of conversions to long,
to alert the programmer to portability issues).
This should eliminate Robert's concerns about intentional use of -
for two's complement: in such cases, the result would not be widened.

Yes, that sounds right, although I wonder how common this case is ...

Well there's other cases resulting in the same problem as well...

See e.g. http://gcc.gnu.org/ml/gcc-patches/2003-12/msg01303.html .


Segher

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