On Wed, Aug 12, 2015 at 11:11 PM, George Spelvin <[email protected]> wrote:
>
> Agreed. But some x86 code I'm working on now, I have a *lot* of
> asm("divl") calls because even do_div isn't great for 64/32->32 division.
Yeah.
I'm not convinced that "64/32->32" is all that generic, though. If
the dividend in 64-bit, there's no fundamental type-based guarantee
that things will fit.
So your case is rather special, and depends (intimately) on knowing
the actual ranges and how they interact.
That's not a generic situation like "do_div()".
Linus
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