64 lines
1.7 KiB
Rust
64 lines
1.7 KiB
Rust
//@ only-64bit llvm appears to use stores instead of memset on 32bit
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//@ compile-flags: -C opt-level=3 -Z merge-functions=disabled
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//@ needs-deterministic-layouts
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// The below two functions ensure that both `String::new()` and `"".to_string()`
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// produce the identical code.
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#![crate_type = "lib"]
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// CHECK-LABEL: define {{(dso_local )?}}void @string_new
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#[no_mangle]
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pub fn string_new() -> String {
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// CHECK-NOT: load i8
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// CHECK: store i{{32|64}}
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// CHECK-NEXT: getelementptr
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// CHECK-NEXT: store ptr
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// CHECK-NEXT: getelementptr
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// CHECK-NEXT: store i{{32|64}}
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// CHECK-NEXT: ret void
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String::new()
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}
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// CHECK-LABEL: define {{(dso_local )?}}void @empty_to_string
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#[no_mangle]
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pub fn empty_to_string() -> String {
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// CHECK-NOT: load i8
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// CHECK: store i{{32|64}}
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// CHECK-NEXT: getelementptr
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// CHECK-NEXT: store ptr
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// CHECK-NEXT: getelementptr
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// CHECK-NEXT: store i{{32|64}}
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// CHECK-NEXT: ret void
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"".to_string()
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}
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// The below two functions ensure that both `vec![]` and `vec![].clone()`
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// produce the identical code.
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// CHECK-LABEL: @empty_vec
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#[no_mangle]
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pub fn empty_vec() -> Vec<u8> {
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// CHECK: store i{{32|64}}
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// CHECK-NOT: load i8
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// CHECK-NEXT: getelementptr
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// CHECK-NEXT: store ptr
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// CHECK-NEXT: getelementptr
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// CHECK-NEXT: store i{{32|64}}
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// CHECK-NEXT: ret void
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vec![]
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}
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// CHECK-LABEL: @empty_vec_clone
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#[no_mangle]
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pub fn empty_vec_clone() -> Vec<u8> {
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// CHECK: store i{{32|64}}
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// CHECK-NOT: load i8
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// CHECK-NEXT: getelementptr
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// CHECK-NEXT: store ptr
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// CHECK-NEXT: getelementptr
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// CHECK-NEXT: store i{{32|64}}
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// CHECK-NEXT: ret void
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vec![].clone()
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}
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