As the question says. Will programs built with gcc -march=k10 run on later generation AMD CPU's? I don't care at all about Intel CPU's.
Phoronix is one of the main Linux Forums for AMD. Here they are testing GCC 8.1 vs GCC 7.3 with both Intel and AMD CPU systems: https://www.phoronix.com/scan.php?page=article&item=gcc-81-benchmarks&num=1
Copied from above link show the five CPU tested with GCC 8.1:
All five systems were running Ubuntu 18.04 LTS x86_64, but that's about as much as was in common with these five distinct systems used for getting an overall view at the direction of the GCC 8 performance. The test systems came down to:
Core i7 8700K - The current-generation i7-8700K Coffeelake CPU that is six cores / 12 threads and the system was built with the ASUS PRIME Z370-A motherboard, 16GB of DDR4, 120GB Intel SSD, and Radeon RX Vega 64 graphics card.
Core i9 7980XE - The high-end Skylake-X system with 18 cores / 36 threads, ASUS PRIME X299-A motherboard, 16GB DDR4, and Intel 256GB 700p SSD.
2 x Xeon Gold 6138 - The Tyan 1U server with two Xeon Gold 6138 Xeon Scalable CPUs for delivering 40 cores / 80 threads with 96GB of RAM, and 256GB Samsung 850 SSD.
Ryzen 7 2700X - The new high-end Zen+ CPU with eight cores / 16 threads. This system had the ASUS ROG CROSSHAIR VII HERO motherboard, 8GB DDR4, Samsung 950 PRO 256GB SSD, and Radeon RX 580 graphics card.
EPYC 7601 - The AMD EPYC 7601 CPU with 32 cores / 64 threads in a single-socket configuration on a Tyan 2U server with 128GB of DDR4 memory and 280GB Intel 900p SSD.
Good information but not what I asked. To be even more specific:
If I build say Firefox with gcc -march=k10 will that run on say a Ryzen without any crashes from k10 instructions. Or do I have to build way back to k8? I know k8 runs on k10. Windows is built for i686 so that code will run on anything but will a Ryzen, Bulldozer ... run on k10 code.
I needed to find out what GCC K10 was. That tells you how little of any knowledge I have on the subject. I thought the link at Phoronix would have shown that maybe AMD Ryzens will run on GCC K10.
Sorry if I misunderstood your post. Anyway, Phoronix Linux Forum is a very good place to ask and maybe find out the info you need. I understand now what you are talking about.
You might want to post here at AMD Developer's Forum for your technical question on Linux using GCC K10 coding. Newcomers Start Here . Maybe one of the AMD Moderators can answer your question like Deepak
You may need to be "White listed " first by Deepak to have access to that particular Forum.
I don't know if AMD Support will be able to answer your Question but it won't hurt to open an AMD EMAIL SUPPORT Ticket and see what they say. : Email Form .
Anyways, Hope you find your answer.
I think the only oddity with K10 was the SSE4a instructions. There were only half a dozen instructions, maybe less. Ryzen should do those.
Bigger problem would be 3DNOW instructions, which AMD dropped.