[llvm-commits] PATCH: Fix quadratic behavior in PR12652

[Chandler Carruth]

It doesn't grow by the size of the input squared, it grows by a constant
factor of the size of the input, the constant happens to be "2" instead of
"1". Thus if I double the size of the input, I quadruple the runtime. It
isn't quadratic unless when I quadruple the size of the input, it
multiplies the time by 16 (4*4) -- currently it just multiplies it by 8 (2
* 4).


On Fri, Jul 6, 2012 at 1:36 AM, Jay Foad <jay.foad at gmail.com> wrote:

> On 6 July 2012 09:28, Chandler Carruth <chandlerc at gmail.com> wrote:
> > The performance which was previously quadratic is now roughly linear, but
> > it's a rather unfortunate linear: 2x. Every doubling of the input size
> > quadruples the compile time.
>
> Then it's quadratic, not linear! Can you explain properly?
>
> Thanks,
> Jay.
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