| //@ ignore-debug: FIXME: checks for call detect scoped noalias metadata |
| //@ compile-flags: -O -Z merge-functions=disabled |
| #![crate_type = "lib"] |
| |
| // Ensure that trivial casts of vec elements are O(1) |
| |
| pub struct Wrapper<T>(T); |
| |
| // previously repr(C) caused the optimization to fail |
| #[repr(C)] |
| pub struct Foo { |
| a: u64, |
| b: u64, |
| c: u64, |
| d: u64, |
| } |
| |
| // implementing Copy exercises the TrustedRandomAccess specialization inside the in-place |
| // specialization |
| #[derive(Copy, Clone)] |
| pub struct Bar { |
| a: u64, |
| b: u64, |
| c: u64, |
| d: u64, |
| } |
| |
| // this exercises the try-fold codepath |
| pub struct Baz { |
| a: u64, |
| b: u64, |
| c: u64, |
| d: u64, |
| } |
| |
| // CHECK-LABEL: @vec_iterator_cast_primitive |
| #[no_mangle] |
| pub fn vec_iterator_cast_primitive(vec: Vec<i8>) -> Vec<u8> { |
| // CHECK-NOT: loop |
| // CHECK-NOT: call |
| vec.into_iter().map(|e| e as u8).collect() |
| } |
| |
| // CHECK-LABEL: @vec_iterator_cast_wrapper |
| #[no_mangle] |
| pub fn vec_iterator_cast_wrapper(vec: Vec<u8>) -> Vec<Wrapper<u8>> { |
| // CHECK-NOT: loop |
| // CHECK-NOT: call |
| vec.into_iter().map(|e| Wrapper(e)).collect() |
| } |
| |
| // CHECK-LABEL: @vec_iterator_cast_unwrap |
| #[no_mangle] |
| pub fn vec_iterator_cast_unwrap(vec: Vec<Wrapper<u8>>) -> Vec<u8> { |
| // CHECK-NOT: loop |
| // CHECK-NOT: call |
| vec.into_iter().map(|e| e.0).collect() |
| } |
| |
| // CHECK-LABEL: @vec_iterator_cast_aggregate |
| #[no_mangle] |
| pub fn vec_iterator_cast_aggregate(vec: Vec<[u64; 4]>) -> Vec<Foo> { |
| // CHECK-NOT: loop |
| // CHECK-NOT: call |
| vec.into_iter().map(|e| unsafe { std::mem::transmute(e) }).collect() |
| } |
| |
| // CHECK-LABEL: @vec_iterator_cast_deaggregate_tra |
| #[no_mangle] |
| pub fn vec_iterator_cast_deaggregate_tra(vec: Vec<Bar>) -> Vec<[u64; 4]> { |
| // CHECK-NOT: loop |
| // CHECK-NOT: call |
| |
| // Safety: For the purpose of this test we assume that Bar layout matches [u64; 4]. |
| // This currently is not guaranteed for repr(Rust) types, but it happens to work here and |
| // the UCG may add additional guarantees for homogenous types in the future that would make this |
| // correct. |
| vec.into_iter().map(|e| unsafe { std::mem::transmute(e) }).collect() |
| } |
| |
| // CHECK-LABEL: @vec_iterator_cast_deaggregate_fold |
| #[no_mangle] |
| pub fn vec_iterator_cast_deaggregate_fold(vec: Vec<Baz>) -> Vec<[u64; 4]> { |
| // CHECK-NOT: loop |
| // CHECK-NOT: call |
| |
| // Safety: For the purpose of this test we assume that Bar layout matches [u64; 4]. |
| // This currently is not guaranteed for repr(Rust) types, but it happens to work here and |
| // the UCG may add additional guarantees for homogenous types in the future that would make this |
| // correct. |
| vec.into_iter().map(|e| unsafe { std::mem::transmute(e) }).collect() |
| } |
| |
| // CHECK-LABEL: @vec_iterator_cast_unwrap_drop |
| #[no_mangle] |
| pub fn vec_iterator_cast_unwrap_drop(vec: Vec<Wrapper<String>>) -> Vec<String> { |
| // CHECK-NOT: br i1 %{{.*}}, label %{{.*}}, label %{{.*}} |
| // CHECK-NOT: call |
| // CHECK-NOT: %{{.*}} = mul |
| // CHECK-NOT: %{{.*}} = udiv |
| |
| vec.into_iter().map(|Wrapper(e)| e).collect() |
| } |
| |
| // CHECK-LABEL: @vec_iterator_cast_wrap_drop |
| #[no_mangle] |
| pub fn vec_iterator_cast_wrap_drop(vec: Vec<String>) -> Vec<Wrapper<String>> { |
| // CHECK-NOT: br i1 %{{.*}}, label %{{.*}}, label %{{.*}} |
| // CHECK-NOT: call |
| // CHECK-NOT: %{{.*}} = mul |
| // CHECK-NOT: %{{.*}} = udiv |
| |
| vec.into_iter().map(Wrapper).collect() |
| } |