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The Scalable Matrix Extension (SME) does not require extra options beyond setting the cpu to "max". https://qemu-project.gitlab.io/qemu/system/arm/cpu-features.html#sme-cpu-property-examples SME depends on SVE, so that will be enabled too even if you don't ask for it by name. --sve --sme -> SVE and SME --sme -> SVE and SME --sve -> Only SVE Reviewed By: omjavaid Differential Revision: https://reviews.llvm.org/D152519