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09d5bcf1ad
Improve performance of `String` methods by avoiding unnecessary memcpy for the character bytes, with added codegen check to ensure compliance.
12 lines
309 B
Rust
12 lines
309 B
Rust
//! Check that `String::push` is optimized enough not to call `memcpy`.
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//@ compile-flags: -O
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#![crate_type = "lib"]
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// CHECK-LABEL: @string_push_does_not_call_memcpy
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#[no_mangle]
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pub fn string_push_does_not_call_memcpy(s: &mut String, ch: char) {
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// CHECK-NOT: call void @llvm.memcpy
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s.push(ch);
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}
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