pub unsafe fn _xsaveopt(mem_addr: *mut u8, save_mask: u64)Available on (x86 or x86-64) and target feature
xsave,xsaveopt and x86 only.Expand description
Performs a full or partial save of the enabled processor states to memory at
mem_addr.
State is saved based on bits [62:0] in save_mask and XCR0.
mem_addr must be aligned on a 64-byte boundary. The hardware may optimize
the manner in which data is saved. The performance of this instruction will
be equal to or better than using the XSAVE instruction.