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Intel Cleans Up LLVM/Clang For Misreporting CLDEMOTE On Arrow Lake & Future Hybrid CPUs
Code compilers like the prominent GCC and LLVM/Clang have been advertising support for the Cache Line Demote 'CLDEMOTE' instruction on Arrow Lake processors as well as Lunar Lake and upcoming Panther Lake hybrid processors
Intel engineers added that compiler plumbing but was inaccurate and inadvertently missed until now with this prominent instruction not being supported there. CLDEMOTE was found beginning with Intel Xeon Sapphire Rapids processors and can be helpful for system performance. This slipped under my radar too but when checking tonight on my Arrow Lake systems, CLDEMOTE support is indeed not advertised by the processor.
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