Nathan Maurice

icon indicating a website link https://www.lip6.fr/actualite/personnes-fiche.php?ident=D2433&LANG=en

icon company LIP6 icon location Paris, France icon location PhD Student, LIP6 laboratory at Sorbonne University, Paris. Working on accelerating image processing algorithms (Connected Component Labeling + SIMD)

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performance on amd 7950x ...

Zen 4 based CPUs perform poorly because AMD's implementation of `compressstoreu` is extremely inefficient ([~142 cycles latency](https://www.mersenneforum.org/showthread.php?p=614191) / [throughput of *54-72* according to uops.info](https://uops.info/table.html?search=vcompress%20(M512&cb_lat=on&cb_tp=on&cb_uops=on&cb_ports=on&cb_ZEN4=on&cb_measurements=on&cb_doc=on&cb_base=on&cb_avx512=on&cb_bmi=on)). It is even worse than an...