mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-01 15:01:51 +00:00
69 lines
1.7 KiB
Rust
69 lines
1.7 KiB
Rust
// compile-flags: -C no-prepopulate-passes
|
|
|
|
#![crate_type = "lib"]
|
|
|
|
// CHECK-LABEL: @zero_sized_elem
|
|
#[no_mangle]
|
|
pub fn zero_sized_elem() {
|
|
// CHECK-NOT: br label %repeat_loop_header{{.*}}
|
|
// CHECK-NOT: call void @llvm.memset.p0
|
|
let x = [(); 4];
|
|
opaque(&x);
|
|
}
|
|
|
|
// CHECK-LABEL: @zero_len_array
|
|
#[no_mangle]
|
|
pub fn zero_len_array() {
|
|
// CHECK-NOT: br label %repeat_loop_header{{.*}}
|
|
// CHECK-NOT: call void @llvm.memset.p0
|
|
let x = [4; 0];
|
|
opaque(&x);
|
|
}
|
|
|
|
// CHECK-LABEL: @byte_array
|
|
#[no_mangle]
|
|
pub fn byte_array() {
|
|
// CHECK: call void @llvm.memset.{{.+}}({{i8\*|ptr}} {{.*}}, i8 7, i{{[0-9]+}} 4
|
|
// CHECK-NOT: br label %repeat_loop_header{{.*}}
|
|
let x = [7u8; 4];
|
|
opaque(&x);
|
|
}
|
|
|
|
#[allow(dead_code)]
|
|
#[derive(Copy, Clone)]
|
|
enum Init {
|
|
Loop,
|
|
Memset,
|
|
}
|
|
|
|
// CHECK-LABEL: @byte_enum_array
|
|
#[no_mangle]
|
|
pub fn byte_enum_array() {
|
|
// CHECK: call void @llvm.memset.{{.+}}({{i8\*|ptr}} {{.*}}, i8 {{.*}}, i{{[0-9]+}} 4
|
|
// CHECK-NOT: br label %repeat_loop_header{{.*}}
|
|
let x = [Init::Memset; 4];
|
|
opaque(&x);
|
|
}
|
|
|
|
// CHECK-LABEL: @zeroed_integer_array
|
|
#[no_mangle]
|
|
pub fn zeroed_integer_array() {
|
|
// CHECK: call void @llvm.memset.{{.+}}({{i8\*|ptr}} {{.*}}, i8 0, i{{[0-9]+}} 16
|
|
// CHECK-NOT: br label %repeat_loop_header{{.*}}
|
|
let x = [0u32; 4];
|
|
opaque(&x);
|
|
}
|
|
|
|
// CHECK-LABEL: @nonzero_integer_array
|
|
#[no_mangle]
|
|
pub fn nonzero_integer_array() {
|
|
// CHECK: br label %repeat_loop_header{{.*}}
|
|
// CHECK-NOT: call void @llvm.memset.p0
|
|
let x = [0x1a_2b_3c_4d_u32; 4];
|
|
opaque(&x);
|
|
}
|
|
|
|
// Use an opaque function to prevent rustc from removing useless drops.
|
|
#[inline(never)]
|
|
pub fn opaque(_: impl Sized) {}
|