XFEATURE_ENABLED_SSE bits set is not needed. CPU correctly handles any bitmask which is subset of the enabled bits in %XCR0. More, CPU instructions XSAVE and XSAVEOPT could write the mask without e.g. XFEATURE_ENABLED_SSE, after the VZEROALL. The check prevents the restoration of the otherwise valid FPU save area. In collaboration with: jhb MFC after: 1 week |
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