rust/tests/codegen/vec-optimizes-away.rs

//@ compile-flags: -Copt-level=3
#![crate_type = "lib"]

#[no_mangle]
pub fn sum_me() -> i32 {
    // CHECK-LABEL: @sum_me
    // CHECK-NEXT: {{^.*:$}}
    // CHECK-NEXT: {{.*}} load volatile i8, ptr @__rust_no_alloc_shim_is_unstable, align 1
    // CHECK-NEXT: ret i32 6
    vec![1, 2, 3].iter().sum::<i32>()
}
tests/codegen: use -Copt-level=3 instead of -O 2025-02-08 19:45:40 -08:00			`//@ compile-flags: -Copt-level=3`
Prevent insta-stable no alloc shim support You will need to add the following as replacement for the old __rust_* definitions when not using the alloc shim. #[no_mangle] static __rust_no_alloc_shim_is_unstable: u8 = 0; 2022-09-10 11:33:44 +00:00			`#![crate_type = "lib"]`
std: Mark `Layout::repeat` as `#[inline]` This fixes an optimization regression by allowing LLVM to see through more functions. Closes #43272 2017-07-27 14:53:44 -07:00
			`#[no_mangle]`
			`pub fn sum_me() -> i32 {`
			`// CHECK-LABEL: @sum_me`
			`// CHECK-NEXT: {{^.*:$}}`
Prevent insta-stable no alloc shim support You will need to add the following as replacement for the old __rust_* definitions when not using the alloc shim. #[no_mangle] static __rust_no_alloc_shim_is_unstable: u8 = 0; 2022-09-10 11:33:44 +00:00			`// CHECK-NEXT: {{.*}} load volatile i8, ptr @__rust_no_alloc_shim_is_unstable, align 1`
std: Mark `Layout::repeat` as `#[inline]` This fixes an optimization regression by allowing LLVM to see through more functions. Closes #43272 2017-07-27 14:53:44 -07:00			`// CHECK-NEXT: ret i32 6`
			`vec![1, 2, 3].iter().sum::<i32>()`
			`}`