Skip to main content

## _xsavec64

# Function _xsavec64

1.27.0 · Source

    pub unsafe fn _xsavec64(mem_addr: *mut u8, save_mask: u64)

Available on x86-64 and target feature `xsave` and target feature `xsavec` only.
Expand description

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