c1b3e88844
Follow on to D144209 to support single implementation devirtualization for Regular LTO when the vtable holds a function alias. For now I have prevented other optimizations performed in regular LTO that need to analyze the contents of the function target when the vtable holds an alias, as I'm not sure they are always correct to perform in that case. Differential Revision: https://reviews.llvm.org/D144270
93 lines
3.0 KiB
LLVM
93 lines
3.0 KiB
LLVM
; REQUIRES: x86-registered-target
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;; Check for successful devirtualization when vtable contains an alias,
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;; and there is a single implementation.
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;; Test pure ThinLTO
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;; Generate unsplit module with summary for ThinLTO index-based WPD.
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; RUN: opt -thinlto-bc -o %t1.o %s
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;; Check that we have properly recorded the alias in the vtable summary.
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; RUN: llvm-dis -o - %t1.o | FileCheck %s --check-prefix SUMMARY
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; SUMMARY: gv: (name: "_ZTV1D", {{.*}} vTableFuncs: ((virtFunc: ^[[ALIAS:([0-9]+)]], offset: 16))
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; SUMMARY: ^[[ALIAS]] = gv: (name: "_ZN1D1mEiAlias"
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; RUN: llvm-lto2 run %t1.o -save-temps -pass-remarks=. \
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; RUN: -whole-program-visibility \
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; RUN: -wholeprogramdevirt-print-index-based \
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; RUN: -o %t2 \
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; RUN: -r=%t1.o,test,px \
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; RUN: -r=%t1.o,_ZTV1D,px \
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; RUN: -r=%t1.o,_ZN1D1mEi,px \
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; RUN: -r=%t1.o,_ZN1D1mEiAlias,px \
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; RUN: 2>&1 | FileCheck %s --check-prefix=REMARK --check-prefix=PRINT
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; RUN: llvm-dis %t2.1.4.opt.bc -o - | FileCheck %s --check-prefix=CHECK-IR1
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; PRINT-DAG: Devirtualized call to {{.*}} (_ZN1D1mEiAlias)
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; REMARK-DAG: single-impl: devirtualized a call to _ZN1D1mEiAlias
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;; Test hybrid Thin/Regular LTO
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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 %t3.o %s
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; RUN: llvm-lto2 run %t3.o -save-temps -pass-remarks=. \
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; RUN: -whole-program-visibility \
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; RUN: -o %t4 \
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; RUN: -r=%t3.o,test,px \
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; RUN: -r=%t3.o,_ZTV1D, \
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; RUN: -r=%t3.o,_ZTV1D,px \
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; RUN: -r=%t3.o,_ZN1D1mEi,px \
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; RUN: -r=%t3.o,_ZN1D1mEiAlias,px \
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; RUN: -r=%t3.o,_ZN1D1mEiAlias, \
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; RUN: 2>&1 | FileCheck %s --check-prefix=REMARK
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; RUN: llvm-dis %t4.1.4.opt.bc -o - | FileCheck %s --check-prefix=CHECK-IR1
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;; Test Regular LTO
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; RUN: opt -o %t5.o %s
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; RUN: llvm-lto2 run %t5.o -save-temps -pass-remarks=. \
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; RUN: -whole-program-visibility \
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; RUN: -o %t6 \
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; RUN: -r=%t5.o,test,px \
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; RUN: -r=%t5.o,_ZTV1D,px \
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; RUN: -r=%t5.o,_ZN1D1mEi,px \
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; RUN: -r=%t5.o,_ZN1D1mEiAlias,px \
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; RUN: 2>&1 | FileCheck %s --check-prefix=REMARK
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; RUN: llvm-dis %t6.0.4.opt.bc -o - | FileCheck %s --check-prefix=CHECK-IR1
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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.D = type { ptr }
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@_ZTV1D = constant { [3 x ptr] } { [3 x ptr] [ptr null, ptr undef, ptr @_ZN1D1mEiAlias] }, !type !3
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define i32 @_ZN1D1mEi(ptr %this, i32 %a) {
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ret i32 0;
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}
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@_ZN1D1mEiAlias = unnamed_addr alias i32 (ptr, i32), ptr @_ZN1D1mEi
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; CHECK-IR1-LABEL: define i32 @test
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define i32 @test(ptr %obj2, i32 %a) {
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entry:
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%vtable2 = load ptr, ptr %obj2
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%p2 = call i1 @llvm.type.test(ptr %vtable2, metadata !"_ZTS1D")
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call void @llvm.assume(i1 %p2)
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%fptr33 = load ptr, ptr %vtable2, align 8
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;; Check that the call was devirtualized.
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;; CHECK-IR1: %call4 = tail call i32 @_ZN1D1mEi
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%call4 = tail call i32 %fptr33(ptr nonnull %obj2, i32 %a)
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ret i32 %call4
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}
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; CHECK-IR1-LABEL: ret i32
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; CHECK-IR1-LABEL: }
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declare i1 @llvm.type.test(ptr, metadata)
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declare void @llvm.assume(i1)
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!3 = !{i64 16, !"_ZTS1D"}
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