On 24/02/2016 22:06, Bram Moolenaar wrote:
Because they actually cause an overflow problem (potentionally):
- || top >= bot
+ || top - bot >= 0
The existing line doesn't do any subtraction thus can't overflow, it's a
simple comparison. The second one could have an overflow.
So we are just avoiding a bogus warning, not fixing a problem.
The warning is likely to be from in-lining u_save() into u_save_cursor()
when using -O3. The version of gcc being used sees that, assuming no
signed integer overflow, top >= bot will always be false and the
condition is redundant.
Mike
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