pointers - Wrong common expression substitution in C compiler? -

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double *p;

apparently, gcc 4.6.3 increments p 1 in following line under -o3. 

myfunc (*(p++), *(p++));

is bug?

*(p++) doesn't increment value pointer points to.

if want value incremented (*p)++ ;

another thing is, aren't guaranteed order in parameters evaluated. depends on compiler. left side incremented first, incremented second. regardless 1 parameter sent in original value , next original value + 1 (due nature of post increment); outside function, if didn't modify *p inside it, *p should have been incremented twice.


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