File: string-push.rs

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rustc 1.89.0%2Bdfsg1-1
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//! Check that `String::push` is optimized enough not to call `memcpy`.

//@ compile-flags: -O
#![crate_type = "lib"]

// CHECK-LABEL: @string_push_does_not_call_memcpy
#[no_mangle]
pub fn string_push_does_not_call_memcpy(s: &mut String, ch: char) {
    // CHECK-NOT: call void @llvm.memcpy
    s.push(ch);
}