On Sun, Dec 13, 2015 at 10:25 PM, Ronald S. Bultje wrote:
> Hi,
>
> On Sun, Dec 13, 2015 at 7:29 PM, Ganesh Ajjanagadde
> wrote:
>
>> The worst part is that it is a bad idea to do runtime dispatch on the
>> fma() itself, as the function call overhead will be nonneglible, and
>> so one can't creat
Hi,
On Sun, Dec 13, 2015 at 7:29 PM, Ganesh Ajjanagadde
wrote:
> The worst part is that it is a bad idea to do runtime dispatch on the
> fma() itself, as the function call overhead will be nonneglible, and
> so one can't create a helper API in avutil or elsewhere. Thus, it can
> only be used whe
On Sun, Dec 13, 2015 at 6:55 PM, James Almer wrote:
[...]
>
> FP_FAST_FMA is apparently not defined on mingw-w64 even though it supports
> fma() and generates FMA3/4 instructions when targeting relevant CPUs.
Guess some implementer took the "optional" literally and decided not to bother.
>
> I a
On 12/13/2015 8:08 PM, Ganesh Ajjanagadde wrote:
> On Sun, Dec 13, 2015 at 5:55 PM, Ganesh Ajjanagadde
> wrote:
>> On Sun, Dec 13, 2015 at 5:47 PM, Ronald S. Bultje wrote:
>>> Hi,
>>>
>>> On Sun, Dec 13, 2015 at 4:59 PM, Ganesh Ajjanagadde
>>> wrote:
fma is a faster function on archite
On Sun, Dec 13, 2015 at 5:55 PM, Ganesh Ajjanagadde
wrote:
> On Sun, Dec 13, 2015 at 5:47 PM, Ronald S. Bultje wrote:
>> Hi,
>>
>> On Sun, Dec 13, 2015 at 4:59 PM, Ganesh Ajjanagadde
>> wrote:
>>>
>>> fma is a faster function on architectures supporting a native CPU
>>> instruction for it.
>>> T
On Sun, Dec 13, 2015 at 5:47 PM, Ronald S. Bultje wrote:
> Hi,
>
> On Sun, Dec 13, 2015 at 4:59 PM, Ganesh Ajjanagadde
> wrote:
>>
>> fma is a faster function on architectures supporting a native CPU
>> instruction for it.
>> This may be tested by the ISO C optionally defined FP_FAST_FMA. Althoug
Hi,
On Sun, Dec 13, 2015 at 4:59 PM, Ganesh Ajjanagadde
wrote:
> fma is a faster function on architectures supporting a native CPU
> instruction for it.
> This may be tested by the ISO C optionally defined FP_FAST_FMA. Although
> in the x86 lineup this came fairly late
> (from Haswell onwards, a
fma is a faster function on architectures supporting a native CPU instruction
for it.
This may be tested by the ISO C optionally defined FP_FAST_FMA. Although
in the x86 lineup this came fairly late
(from Haswell onwards, and hence is absent unless appropriate -march is passed),
numerous other arc
