1 // compile-flags: -O -Z merge-functions=disabled
4 #![feature(core_intrinsics)]
6 // Check that we annotate size loads from vtables with 0..(isize::MAX + 1) range metadata.
12 // Note that rustc uses inclusive bounds, but LLVM uses exclusive bounds for range metadata.
13 // CHECK-LABEL: @generate_exclusive_bound
15 pub fn generate_exclusive_bound() -> usize {
16 // CHECK: ret [[USIZE:i[0-9]+]] [[EXCLUSIVE_BOUND:[-0-9]+]]
17 isize::MAX as usize + 1
20 // CHECK-LABEL: @size_load_from_size_of_val
22 pub fn size_load_from_size_of_val(x: &dyn Trait) -> usize {
23 // CHECK: {{%[0-9]+}} = load [[USIZE]], {{.+}} !range [[RANGE_META:![0-9]+]]
24 core::mem::size_of_val(x)
27 // CHECK-LABEL: @size_load_from_vtable_size_intrinsic
29 pub unsafe fn size_load_from_vtable_size_intrinsic(x: &dyn Trait) -> usize {
30 let (data, vtable): (*const (), *const ()) = core::mem::transmute(x);
31 // CHECK: {{%[0-9]+}} = load [[USIZE]], {{.+}} !range [[RANGE_META]]
32 core::intrinsics::vtable_size(vtable)
35 // CHECK: [[RANGE_META]] = !{[[USIZE]] 0, [[USIZE]] [[EXCLUSIVE_BOUND]]}