1; RUN: opt -S -passes=wholeprogramdevirt -whole-program-visibility -pass-remarks=wholeprogramdevirt %s 2>&1 | FileCheck %s 2 3target datalayout = "e-p:64:64" 4target triple = "x86_64-unknown-linux-gnu" 5 6; CHECK: remark: <unknown>:0:0: single-impl: devirtualized a call to vf 7; CHECK: remark: <unknown>:0:0: devirtualized vf 8; CHECK-NOT: devirtualized 9 10; A vtable with "relative pointers", slots don't contain pointers to implementations, but instead have an i32 offset from the vtable itself to the implementation. 11@vtable = internal unnamed_addr constant { [2 x i32] } { [2 x i32] [ 12 i32 trunc (i64 sub (i64 ptrtoint (ptr @vfunc1_live to i64), i64 ptrtoint (ptr @vtable to i64)) to i32), 13 i32 trunc (i64 sub (i64 ptrtoint (ptr @vfunc2_dead to i64), i64 ptrtoint (ptr @vtable to i64)) to i32) 14]}, align 8, !type !0, !type !1 15;, !vcall_visibility !{i64 2} 16!0 = !{i64 0, !"vfunc1.type"} 17!1 = !{i64 4, !"vfunc2.type"} 18 19define internal void @vfunc1_live() { 20 ret void 21} 22 23define internal void @vfunc2_dead() { 24 ret void 25} 26 27; CHECK: define void @call 28define void @call(ptr %obj) { 29 %vtable = load ptr, ptr %obj 30 %pair = call {ptr, i1} @llvm.type.checked.load.relative(ptr %vtable, i32 0, metadata !"vfunc1.type") 31 %fptr = extractvalue {ptr, i1} %pair, 0 32 %p = extractvalue {ptr, i1} %pair, 1 33 ; CHECK: br i1 true, 34 br i1 %p, label %cont, label %trap 35 36cont: 37 ; CHECK: call void @vfunc1_live( 38 call void %fptr() 39 ret void 40 41trap: 42 call void @llvm.trap() 43 unreachable 44} 45 46declare {ptr, i1} @llvm.type.checked.load.relative(ptr, i32, metadata) 47declare void @llvm.trap() 48