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Date: Wed, 16 Jul 2014 17:25:38 -0700
Message-ID: <CAESVnVreaYMCe8hiKYzwqD=PfOQvr81ZbBmoj5EEi0_ZoMSGKQ@mail.gmail.com>
To: Andrea Faulds <ajf@ajf.me>
Cc: bishop@php.net, PHP internals <internals@lists.php.net>
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Subject: Re: [PHP-DEV] [RFC] intdiv()
From: pollita@php.net (Sara Golemon)

On Wed, Jul 16, 2014 at 8:15 AM, Andrea Faulds <ajf@ajf.me> wrote:
> Nikita Popov doesn=E2=80=99t seem to be a fan of the %% syntax, so it may=
 be subject to change, though I think it=E2=80=99s the best I=E2=80=99ve he=
ard so far. ;)
>
Nor am I.  Here's a thought though: How about just making / return int
when there's no remainder.

Looking at this code, you might think it's inefficent:

double dres =3D a / b;
long lres =3D a / b;
if (a % b) {
  return dres;
} else {
  return lres;
}

But in fact at -O1, gcc will optimize this (probably clang and others
as well) to a single idivq instruction and only do the cvtsi2sdq in
the dres case.

My point being, we can just make division with an integral result
return a result of integer division without altering the syntax or
adding a perf hit.

-Sara