Function core::arch::x86_64::_xsavec

pub unsafe fn _xsavec(mem_addr: *mut u8, save_mask: u64)

This is supported on x86-64 and target feature xsave,xsavec only.

Performs a full or partial save of the enabled processor states to memory at mem_addr.

xsavec differs from xsave in that it uses compaction and that it may use init optimization. State is saved based on bits [62:0] in save_mask and XCR0. mem_addr must be aligned on a 64-byte boundary.

Intel’s documentation