FMA4 instruction set hidden, but is working on AMD Zen processors
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nevcairiel
In real-world code there really is no huge performance difference between FMA3 and FMA4, certainly not anything on the scale of 33%. Not sure where that number even comes from. 4 = 3 + 33%? 😛
The comparisons in Wendells video are of AVX vs FMA4, not accounting for FMA3.
RzrTrek
[youtube=YAoaSuq1E8w]
There's the full in depth video on the subject. I just love the guys over at Level1Techs.
They're very open and knowledgeable. Also their weekly news episodes makes me giggle like a girl.
Hilbert Hagedoorn
Administrator
BLEH!
So Zen could potentially be even faster than it already is???
asturur
in very narrow and particular scenarios where you need tons of multiply add and someone writing software enabled this feature, yes
Fediuld
BLEH!
nevcairiel
Alessio1989
This is an old news. Moreover seems that using FMA4 under Zen gives wrong results: https://translate.google.it/translate?hl=it&sl=de&tl=en&u=http://www.planet3dnow.de/vbulletin/threads/421433-AMD-Zen-14nm-8-Kerne-95W-TDP-DDR4?p=5147746&viewfull=1
Intel supports FMA3 since Haswell.
Astyanax
https://www.agner.org/optimize/blog/read.php?i=838
news should be reworded to "in a video that could only be considered clickbaiting, level1techs has reported on something we already knew a year ago"
Very very old news.