AMD "Zen" Does Support FMA4, Just Not Exposed
https://www.techpowerup.com/248560/amd-zen-does-support-fma4-just-not-exposed
FMA4 这个从推土机架构开始就支持，一直到打桩机 / 压路机 / 挖路机都是支持的，Zen 反而不回报自己支持。要单纯说 bug 的话要出 bug 早就应该出了，也早就应该修了。所以为什么实际上支持但不报告呢就很奇怪了。
TechPowerUp
AMD "Zen" Does Support FMA4, Just Not Exposed
With its "Zen" CPU microarchitecture, AMD removed support for the FMA4 instruction-set, on paper. This, while retaining FMA3. Level1Techs discovered that "Zen" CPUs do support FMA4 instructions, even through the instruction-set is not exposed to the operating…
 
 
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