On 2020-04-26 2:13 PM, Thomas David Rivers wrote:
There's a lot being thrown around here....
However, there _are_ places in the C language where the compiler must
fold constants at compile time, e.g.:
enum tag { one = (1+0), two = (1+1+0) };
That is obliged to compile and the compiler most compute those
additions to provide the proper values for the "one" and "two"
enumeration
constants.
The C standard has more details about this. So most compilers will
easily handle most constant computions (there are several corners
that are interesting to consider... probably only interesting to
compiler writers :-) )
It seems there were plenty of other answers about the vagaries
of parameters and default integer promotions, etc...
Great post (from an expert)! default integer promotions can be
particularly treacherous!
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