On Tue, Dec 1, 2015 at 7:39 PM, Lou Logan wrote:
> On Tue, 1 Dec 2015 19:27:49 -0500, Ganesh Ajjanagadde wrote:
>
>> The slowness comes from the generate code, e.g llrint compiles down to
>> a single asm instruction cvttsd2si, while floor(x + 0.5) needs to do
>> multiple things.
>
> How much slow
On Tue, 1 Dec 2015 19:27:49 -0500, Ganesh Ajjanagadde wrote:
> The slowness comes from the generate code, e.g llrint compiles down to
> a single asm instruction cvttsd2si, while floor(x + 0.5) needs to do
> multiple things.
How much slower is it?
___
f
Currently, there are numerous instances where the appropriate libm rounding
functions lrint, llrint, rint, etc are not used and instead ad-hoc, slow, and
sometimes
risky floor(x + 0.5) and the like are being used. The risk comes from the fact
that such a thing is broken for negative values and val
