rust/tests/codegen/array-clone.rs

//@ compile-flags: -O

#![crate_type = "lib"]

// CHECK-LABEL: @array_clone
#[no_mangle]
pub fn array_clone(a: &[u8; 2]) -> [u8; 2] {
    // CHECK-NOT: getelementptr
    // CHECK-NOT: load i8
    // CHECK-NOT: zext
    // CHECK-NOT: shl
    // CHECK: load i16
    // CHECK-NEXT: ret i16
    a.clone()
}
[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives 2024-02-22 12:10:29 +00:00			`//@ compile-flags: -O`
Specialize array cloning for Copy types Because after PR 86041, the optimizer no longer load-merges at the LLVM IR level, which might be part of the perf loss. (I'll run perf and see if this makes a difference.) Also I added a codegen test so this hopefully won't regress in future -- it passes on stable and with my change here, but not on the 2021-11-09 nightly. 2021-11-10 05:43:20 +00:00
			`#![crate_type = "lib"]`

			`// CHECK-LABEL: @array_clone`
			`#[no_mangle]`
			`pub fn array_clone(a: &[u8; 2]) -> [u8; 2] {`
			`// CHECK-NOT: getelementptr`
			`// CHECK-NOT: load i8`
			`// CHECK-NOT: zext`
			`// CHECK-NOT: shl`
			`// CHECK: load i16`
			`// CHECK-NEXT: ret i16`
			`a.clone()`
			`}`