1; REQUIRES: x86 2;; Test that --lto-whole-program-visibility enables devirtualization. 3 4;; Index based WPD 5;; Generate unsplit module with summary for ThinLTO index-based WPD. 6; RUN: opt --thinlto-bc -o %t2.o %s 7; RUN: ld.lld %t2.o -o %t3 -save-temps --lto-whole-program-visibility \ 8; RUN: -mllvm -pass-remarks=. 2>&1 | FileCheck %s --check-prefix=REMARK 9; RUN: llvm-dis %t2.o.4.opt.bc -o - | FileCheck %s --check-prefix=CHECK-IR 10 11;; Hybrid WPD 12;; Generate split module with summary for hybrid Thin/Regular LTO WPD. 13; RUN: opt --thinlto-bc --thinlto-split-lto-unit -o %t.o %s 14; RUN: ld.lld %t.o -o %t3 -save-temps --lto-whole-program-visibility \ 15; RUN: -mllvm -pass-remarks=. 2>&1 | FileCheck %s --check-prefix=REMARK 16; RUN: llvm-dis %t.o.4.opt.bc -o - | FileCheck %s --check-prefix=CHECK-IR 17 18;; Regular LTO WPD 19; RUN: opt -o %t4.o %s 20; RUN: ld.lld %t4.o -o %t3 -save-temps --lto-whole-program-visibility \ 21; RUN: -mllvm -pass-remarks=. 2>&1 | FileCheck %s --check-prefix=REMARK 22; RUN: llvm-dis %t3.0.4.opt.bc -o - | FileCheck %s --check-prefix=CHECK-IR 23 24; REMARK-DAG: single-impl: devirtualized a call to _ZN1A1nEi 25; REMARK-DAG: single-impl: devirtualized a call to _ZN1D1mEi 26 27;; Try everything again but without -whole-program-visibility to confirm 28;; WPD fails 29 30;; Index based WPD 31; RUN: ld.lld %t2.o -o %t3 -save-temps \ 32; RUN: -mllvm -pass-remarks=. \ 33; RUN: 2>&1 | FileCheck /dev/null --implicit-check-not single-impl --allow-empty 34; RUN: llvm-dis %t2.o.4.opt.bc -o - | FileCheck %s --check-prefix=CHECK-NODEVIRT-IR 35;; Ensure --no-lto-whole-program-visibility overrides explicit --lto-whole-program-visibility. 36; RUN: ld.lld %t2.o -o %t3 -save-temps --lto-whole-program-visibility --no-lto-whole-program-visibility \ 37; RUN: -mllvm -pass-remarks=. \ 38; RUN: 2>&1 | FileCheck /dev/null --implicit-check-not single-impl --allow-empty 39; RUN: llvm-dis %t2.o.4.opt.bc -o - | FileCheck %s --check-prefix=CHECK-NODEVIRT-IR 40 41;; Hybrid WPD 42; RUN: ld.lld %t.o -o %t3 -save-temps \ 43; RUN: -mllvm -pass-remarks=. \ 44; RUN: 2>&1 | FileCheck /dev/null --implicit-check-not single-impl --allow-empty 45; RUN: llvm-dis %t.o.4.opt.bc -o - | FileCheck %s --check-prefix=CHECK-NODEVIRT-IR 46 47;; Regular LTO WPD 48; RUN: ld.lld %t4.o -o %t3 -save-temps \ 49; RUN: -mllvm -pass-remarks=. \ 50; RUN: 2>&1 | FileCheck /dev/null --implicit-check-not single-impl --allow-empty 51; RUN: llvm-dis %t3.0.4.opt.bc -o - | FileCheck %s --check-prefix=CHECK-NODEVIRT-IR 52 53target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128" 54target triple = "x86_64-grtev4-linux-gnu" 55 56%struct.A = type { ptr } 57%struct.B = type { %struct.A } 58%struct.C = type { %struct.A } 59%struct.D = type { ptr } 60 61@_ZTV1B = constant { [4 x ptr] } { [4 x ptr] [ptr null, ptr undef, ptr @_ZN1B1fEi, ptr @_ZN1A1nEi] }, !type !0, !type !1, !vcall_visibility !5 62@_ZTV1C = constant { [4 x ptr] } { [4 x ptr] [ptr null, ptr undef, ptr @_ZN1C1fEi, ptr @_ZN1A1nEi] }, !type !0, !type !2, !vcall_visibility !5 63@_ZTV1D = constant { [3 x ptr] } { [3 x ptr] [ptr null, ptr undef, ptr @_ZN1D1mEi] }, !type !3, !vcall_visibility !5 64 65; Prevent the vtables from being dead code eliminated. 66@llvm.used = appending global [3 x ptr] [ ptr @_ZTV1B, ptr @_ZTV1C, ptr @_ZTV1D] 67 68; CHECK-IR-LABEL: define dso_local {{(noundef )?}}i32 @_start 69define i32 @_start(ptr %obj, ptr %obj2, i32 %a) { 70entry: 71 %vtable = load ptr, ptr %obj 72 %p = call i1 @llvm.type.test(ptr %vtable, metadata !"_ZTS1A") 73 call void @llvm.assume(i1 %p) 74 %fptrptr = getelementptr ptr, ptr %vtable, i32 1 75 %fptr1 = load ptr, ptr %fptrptr, align 8 76 77 ;; Check that the call was devirtualized. 78 ; CHECK-IR: %call = tail call i32 @_ZN1A1nEi 79 ; CHECK-NODEVIRT-IR: %call = tail call i32 %fptr1 80 %call = tail call i32 %fptr1(ptr nonnull %obj, i32 %a) 81 82 %fptr22 = load ptr, ptr %vtable, align 8 83 84 ;; We still have to call it as virtual. 85 ; CHECK-IR: %call3 = tail call i32 %fptr22 86 ; CHECK-NODEVIRT-IR: %call3 = tail call i32 %fptr22 87 %call3 = tail call i32 %fptr22(ptr nonnull %obj, i32 %call) 88 89 %vtable2 = load ptr, ptr %obj2 90 %p2 = call i1 @llvm.type.test(ptr %vtable2, metadata !4) 91 call void @llvm.assume(i1 %p2) 92 93 %fptr33 = load ptr, ptr %vtable2, align 8 94 95 ;; Check that the call was devirtualized. 96 ; CHECK-IR: %call4 = tail call i32 @_ZN1D1mEi 97 ; CHECK-NODEVIRT-IR: %call4 = tail call i32 %fptr33 98 %call4 = tail call i32 %fptr33(ptr nonnull %obj2, i32 %call3) 99 ret i32 %call4 100} 101; CHECK-IR-LABEL: ret i32 102; CHECK-IR-LABEL: } 103 104declare i1 @llvm.type.test(ptr, metadata) 105declare void @llvm.assume(i1) 106 107define i32 @_ZN1B1fEi(ptr %this, i32 %a) #0 { 108 ret i32 0; 109} 110 111define i32 @_ZN1A1nEi(ptr %this, i32 %a) #0 { 112 ret i32 0; 113} 114 115define i32 @_ZN1C1fEi(ptr %this, i32 %a) #0 { 116 ret i32 0; 117} 118 119define i32 @_ZN1D1mEi(ptr %this, i32 %a) #0 { 120 ret i32 0; 121} 122 123;; Make sure we don't inline or otherwise optimize out the direct calls. 124attributes #0 = { noinline optnone } 125 126!0 = !{i64 16, !"_ZTS1A"} 127!1 = !{i64 16, !"_ZTS1B"} 128!2 = !{i64 16, !"_ZTS1C"} 129!3 = !{i64 16, !4} 130!4 = distinct !{} 131!5 = !{i64 0} 132