forked from OSchip/llvm-project
129 lines
5.1 KiB
LLVM
129 lines
5.1 KiB
LLVM
; REQUIRES: x86
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; Test that --lto-whole-program-visibility enables devirtualization.
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; Index based WPD
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; Generate unsplit module with summary for ThinLTO index-based WPD.
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; RUN: opt --thinlto-bc -o %t2.o %s
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; RUN: ld.lld %t2.o -o %t3 -save-temps --lto-whole-program-visibility \
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; RUN: -mllvm -pass-remarks=. --export-dynamic 2>&1 | FileCheck %s --check-prefix=REMARK
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; RUN: llvm-dis %t2.o.4.opt.bc -o - | FileCheck %s --check-prefix=CHECK-IR
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; Hybrid WPD
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; Generate split module with summary for hybrid Thin/Regular LTO WPD.
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; RUN: opt --thinlto-bc --thinlto-split-lto-unit -o %t.o %s
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; RUN: ld.lld %t.o -o %t3 -save-temps --lto-whole-program-visibility \
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; RUN: -mllvm -pass-remarks=. --export-dynamic 2>&1 | FileCheck %s --check-prefix=REMARK
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; RUN: llvm-dis %t.o.4.opt.bc -o - | FileCheck %s --check-prefix=CHECK-IR
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; Regular LTO WPD
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; RUN: opt -o %t4.o %s
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; RUN: ld.lld %t4.o -o %t3 -save-temps --lto-whole-program-visibility \
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; RUN: -mllvm -pass-remarks=. --export-dynamic 2>&1 | FileCheck %s --check-prefix=REMARK
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; RUN: llvm-dis %t3.0.4.opt.bc -o - | FileCheck %s --check-prefix=CHECK-IR
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; REMARK-DAG: single-impl: devirtualized a call to _ZN1A1nEi
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; REMARK-DAG: single-impl: devirtualized a call to _ZN1D1mEi
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; Try everything again but without -whole-program-visibility to confirm
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; WPD fails
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; Index based WPD
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; RUN: ld.lld %t2.o -o %t3 -save-temps \
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; RUN: -mllvm -pass-remarks=. --export-dynamic 2>&1 | FileCheck %s --implicit-check-not single-impl --allow-empty
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; RUN: llvm-dis %t2.o.4.opt.bc -o - | FileCheck %s --check-prefix=CHECK-NODEVIRT-IR
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; Hybrid WPD
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; RUN: ld.lld %t.o -o %t3 -save-temps \
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; RUN: -mllvm -pass-remarks=. --export-dynamic 2>&1 | FileCheck %s --implicit-check-not single-impl --allow-empty
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; RUN: llvm-dis %t.o.4.opt.bc -o - | FileCheck %s --check-prefix=CHECK-NODEVIRT-IR
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; Regular LTO WPD
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; RUN: ld.lld %t4.o -o %t3 -save-temps \
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; RUN: -mllvm -pass-remarks=. --export-dynamic 2>&1 | FileCheck %s --implicit-check-not single-impl --allow-empty
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; RUN: llvm-dis %t3.0.4.opt.bc -o - | FileCheck %s --check-prefix=CHECK-NODEVIRT-IR
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target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-grtev4-linux-gnu"
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%struct.A = type { i32 (...)** }
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%struct.B = type { %struct.A }
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%struct.C = type { %struct.A }
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%struct.D = type { i32 (...)** }
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@_ZTV1B = constant { [4 x i8*] } { [4 x i8*] [i8* null, i8* undef, i8* bitcast (i32 (%struct.B*, i32)* @_ZN1B1fEi to i8*), i8* bitcast (i32 (%struct.A*, i32)* @_ZN1A1nEi to i8*)] }, !type !0, !type !1, !vcall_visibility !5
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@_ZTV1C = constant { [4 x i8*] } { [4 x i8*] [i8* null, i8* undef, i8* bitcast (i32 (%struct.C*, i32)* @_ZN1C1fEi to i8*), i8* bitcast (i32 (%struct.A*, i32)* @_ZN1A1nEi to i8*)] }, !type !0, !type !2, !vcall_visibility !5
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@_ZTV1D = constant { [3 x i8*] } { [3 x i8*] [i8* null, i8* undef, i8* bitcast (i32 (%struct.D*, i32)* @_ZN1D1mEi to i8*)] }, !type !3, !vcall_visibility !5
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; CHECK-IR-LABEL: define dso_local i32 @_start
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define i32 @_start(%struct.A* %obj, %struct.D* %obj2, i32 %a) {
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entry:
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%0 = bitcast %struct.A* %obj to i8***
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%vtable = load i8**, i8*** %0
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%1 = bitcast i8** %vtable to i8*
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%p = call i1 @llvm.type.test(i8* %1, metadata !"_ZTS1A")
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call void @llvm.assume(i1 %p)
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%fptrptr = getelementptr i8*, i8** %vtable, i32 1
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%2 = bitcast i8** %fptrptr to i32 (%struct.A*, i32)**
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%fptr1 = load i32 (%struct.A*, i32)*, i32 (%struct.A*, i32)** %2, align 8
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; Check that the call was devirtualized.
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; CHECK-IR: %call = tail call i32 @_ZN1A1nEi
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; CHECK-NODEVIRT-IR: %call = tail call i32 %fptr1
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%call = tail call i32 %fptr1(%struct.A* nonnull %obj, i32 %a)
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%3 = bitcast i8** %vtable to i32 (%struct.A*, i32)**
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%fptr22 = load i32 (%struct.A*, i32)*, i32 (%struct.A*, i32)** %3, align 8
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; We still have to call it as virtual.
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; CHECK-IR: %call3 = tail call i32 %fptr22
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; CHECK-NODEVIRT-IR: %call3 = tail call i32 %fptr22
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%call3 = tail call i32 %fptr22(%struct.A* nonnull %obj, i32 %call)
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%4 = bitcast %struct.D* %obj2 to i8***
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%vtable2 = load i8**, i8*** %4
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%5 = bitcast i8** %vtable2 to i8*
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%p2 = call i1 @llvm.type.test(i8* %5, metadata !4)
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call void @llvm.assume(i1 %p2)
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%6 = bitcast i8** %vtable2 to i32 (%struct.D*, i32)**
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%fptr33 = load i32 (%struct.D*, i32)*, i32 (%struct.D*, i32)** %6, align 8
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; Check that the call was devirtualized.
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; CHECK-IR: %call4 = tail call i32 @_ZN1D1mEi
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; CHECK-NODEVIRT-IR: %call4 = tail call i32 %fptr33
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%call4 = tail call i32 %fptr33(%struct.D* nonnull %obj2, i32 %call3)
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ret i32 %call4
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}
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; CHECK-IR-LABEL: ret i32
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; CHECK-IR-LABEL: }
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declare i1 @llvm.type.test(i8*, metadata)
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declare void @llvm.assume(i1)
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define i32 @_ZN1B1fEi(%struct.B* %this, i32 %a) #0 {
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ret i32 0;
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}
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define i32 @_ZN1A1nEi(%struct.A* %this, i32 %a) #0 {
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ret i32 0;
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}
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define i32 @_ZN1C1fEi(%struct.C* %this, i32 %a) #0 {
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ret i32 0;
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}
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define i32 @_ZN1D1mEi(%struct.D* %this, i32 %a) #0 {
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ret i32 0;
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}
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; Make sure we don't inline or otherwise optimize out the direct calls.
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attributes #0 = { noinline optnone }
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!0 = !{i64 16, !"_ZTS1A"}
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!1 = !{i64 16, !"_ZTS1B"}
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!2 = !{i64 16, !"_ZTS1C"}
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!3 = !{i64 16, !4}
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!4 = distinct !{}
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!5 = !{i64 0}
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