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Re: [PATCH 0/2] Introduce gcc_qsort
On Fri, 11 May 2018, Segher Boessenkool wrote:
> For example from reload1.c:
No, this example is not relevant, because ...
> static int
> reload_reg_class_lower (const void *r1p, const void *r2p)
> {
> int r1 = *(const short *) r1p, r2 = *(const short *) r2p;
>
> // ...
>
> return r1 - r2;
this subtracts integers, not pointers.
In general such address-based comparisons steps are invalid; they lack
anti-reflexivity. So comparators are not actually allowed to do that.
Alexander