pub unsafe fn volatile_set_memory<T>(dst: *mut T, val: u8, count: usize)
core_intrinsics)
Equivalent to the appropriate llvm.memset.p0i8.* intrinsic, with a size of count * size_of::<T>() and an alignment of align_of::<T>().
This intrinsic does not have a stable counterpart.
The safety requirements are consistent with write_bytes while the write behavior is volatile, which means it will not be optimized out unless _count or size_of::<T>() is equal to zero.
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https://doc.rust-lang.org/std/intrinsics/fn.volatile_set_memory.html