[PATCH] malloc: Improve csize2tidx

[Wilco Dijkstra]

Hi Cupertino,

>>   /* When "x" is from chunksize().  */
>> -# define csize2tidx(x) (((x) - MINSIZE + MALLOC_ALIGNMENT - 1) / MALLOC_ALIGNMENT)
>> +# define csize2tidx(x) (((x) - MINSIZE) / MALLOC_ALIGNMENT)

> Does it make sense to lose precision, considering that all this macros 
> will be optimized to a constant value ?

I'm not sure what you mean? Like I said, the idea is to use chunksize_nomask()
in free() and still be sure that only valid sizes are accepted for tcache.
Basically this macro should be as simple and as fast as possible given that it is
used before entering the tcache code.

Cheers,
Wilco