The C specification does not say whether post/pre-increment/decrement are evaluated before the particular variable access or before the expression access. Apperantly the compiler evaluated a++ inline for int (and long), and evaluated a++ before the expression for short (and char).
For int, it became: (a++)-(--a), which is ((a1=a,a=a1+1,a1)-(a=a-1)), left to right.
For short, it became: (b=((a1=a)-(a=a-1)),a=a1+1,b) left to right.
Note how a=a1+1 step is either in first part or after evaluating the whole expression.
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The C specification does not say whether post/pre-increment/decrement
are evaluated before the particular variable access or before the
expression access. Apperantly the compiler evaluated a++ inline for
int (and long), and evaluated a++ before the expression for
short (and char).
For int, it became: (a++)-(--a), which is ((a1=a,a=a1+1,a1)-(a=a-1)),
left to right.
For short, it became: (b=((a1=a)-(a=a-1)),a=a1+1,b) left to right.
Note how a=a1+1 step is either in first part or after evaluating the
whole expression.
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