Since 1.52.0 Rust copy byte from static memory for creating String by `Default::default()`. But when uses `"".to_string()` it doesn't happen. Additional instruction appears when use `Default::default()` [(godbolt)](https://godbolt.org/z/bcj8fYxfn) ```rust pub fn string_default() -> String { Default::default() } pub fn string_to_string() -> String { "".to_string() } ``` ```asm example::string_default: mov rax, rdi mov rcx, qword ptr [rip + .L__unnamed_1] xorps xmm0, xmm0 movups xmmword ptr [rdi + 8], xmm0 mov qword ptr [rdi], rcx ret example::string_to_string: mov rax, rdi xorps xmm0, xmm0 movups xmmword ptr [rdi + 8], xmm0 mov qword ptr [rdi], 1 ret .L__unnamed_1: .asciz "\001\000\000\000\000\000\000\000\000\000\000\000\000\000\000" ```