An Intel instruction set crashes AMD Ryzen processors again
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The CPU has a basic instruction set, which refers to the set of all instructions that the CPU can execute. Each instruction corresponds to an operation. Any program must eventually be compiled into instructions for the CPU to recognize and execute. The CPU relies on instructions to calculate and control the system , so the strength of instructions is an important indicator of CPU performance, and the instruction set has also become an effective tool to improve CPU efficiency. The more common ones include MMX, SSE1-4, AVX, etc. Among them, AVX (Advanced Vector Extensions) is generally recognized as the most important advancement of SNB processors, without a doubt . AMD once proposed SSE5 (subset is FMA4), but it failed to seize power and was abandoned, and instead supported AVX , of which FMA3 (fused multiplication and addition) is one of the subsets of AVX. Having said so much background material, let's get to the point. This year's AMD Zen supports AVX and AVX2, and of course supports FMA3. The latter is conducive to improving floating-point computing capabilities . For ordinary users, it involves strong floating-point scenes such as game effects, 3D animation, and video playback. However, a great person in the HWBot forum, "Mystical" Alexander Yee, found that the open source instruction set detection tool Flops (version 2) and Ryzen 7 "do not have the same temperament". They found that when using Haswell-specific binaries to run on Ryzen hosts, the machine will freeze, that is, the CPU will freeze. The Haswell era introduced AVX2 with a vector width of 128. Of course, other software that use FMA, such as prime95 and y-cruncher, have no problems. At present, Alexander Yee uses 1800X/1700 with two different ASUS motherboards, flashes BIOS, and changes to Win7, but none of them have solved the problem. Users who follow up have also reported the same problem. Everyone is worried that Alexander Yee has achieved a hardware-level freeze without administrator privileges. Although ordinary users may hardly encounter such a situation, it is a security risk for enterprise-level products, especially since Naples has not yet been released. As a winner of Toutiao's Qingyun Plan and Baijiahao's Bai+ Plan, the 2019 Baidu Digital Author of the Year, the Baijiahao's Most Popular Author in the Technology Field, the 2019 Sogou Technology and Culture Author, and the 2021 Baijiahao Quarterly Influential Creator, he has won many awards, including the 2013 Sohu Best Industry Media Person, the 2015 China New Media Entrepreneurship Competition Beijing Third Place, the 2015 Guangmang Experience Award, the 2015 China New Media Entrepreneurship Competition Finals Third Place, and the 2018 Baidu Dynamic Annual Powerful Celebrity. |
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