llvm/test/Transforms/WholeProgramDevirt/speculative-devirt-single-impl.ll

; -stats requires asserts
; REQUIRES: asserts

; Check that we can still devirtualize outside LTO mode when speculative devirtualization is enabled.
; Check that we skip devirtualization for empty functions in speculative devirtualization mode

; RUN: opt -S -passes=wholeprogramdevirt -devirtualize-speculatively \
; RUN: -pass-remarks=wholeprogramdevirt -stats %s 2>&1 | FileCheck %s

target datalayout = "e-p:64:64"
target triple = "x86_64-unknown-linux-gnu"

; CHECK: remark: devirt-single.cc:30:32: single-impl: devirtualized a call to vf
; CHECK: remark: devirt-single.cc:41:32: single-impl: devirtualized a call to vf
; CHECK: remark: devirt-single.cc:51:32: single-impl: devirtualized a call to vf
; CHECK: remark: devirt-single.cc:13:0: devirtualized vf
; CHECK-NOT: devirtualized

@vt1 = constant [1 x ptr] [ptr @vf], !type !8
@vt2 = constant [1 x ptr] [ptr @vf_empty], !type !12

define i1 @vf(ptr %this) #0 !dbg !7 {
  ret i1 true
}

; This should NOT be devirtualized because during non-lto empty functions
; are skipped.
define void @vf_empty(ptr %this) !dbg !11 {
  ret void
}

; CHECK: define void @call
define void @call(ptr %obj) #1 !dbg !5 {
  %vtable = load ptr, ptr %obj
  %p = call i1 @llvm.public.type.test(ptr %vtable, metadata !"typeid")
  call void @llvm.assume(i1 %p)
  %fptr = load ptr, ptr %vtable
  ; CHECK: if.true.direct_targ:
  ; CHECK:   call i1 @vf(
  ; CHECK: if.false.orig_indirect:
  ; CHECK:   call i1 %fptr(
  call i1 %fptr(ptr %obj), !dbg !6
  ret void
}


; CHECK: define void @call1
define void @call1(ptr %obj) #1 !dbg !9 {
  %vtable = load ptr, ptr %obj
  %p = call i1 @llvm.type.test(ptr %vtable, metadata !"typeid1")
  call void @llvm.assume(i1 %p)
  %fptr = load ptr, ptr %vtable, align 8
  ; CHECK: call i1 %fptr
  %1 = call i1 %fptr(ptr %obj), !dbg !10
  ret void
}
declare ptr @llvm.load.relative.i32(ptr, i32)

@vt3 = private unnamed_addr constant [1 x i32] [
  i32 trunc (i64 sub (i64 ptrtoint (ptr dso_local_equivalent @vf to i64), i64 ptrtoint (ptr @vt3 to i64)) to i32)
], align 4, !type !15

; CHECK: define void @call2
define void @call2(ptr %obj) #1 !dbg !13 {
  %vtable = load ptr, ptr %obj
  %p = call i1 @llvm.type.test(ptr %vtable, metadata !"typeid2")
  call void @llvm.assume(i1 %p)
  %fptr = call ptr @llvm.load.relative.i32(ptr %vtable, i32 0)
  ; CHECK: if.true.direct_targ:
  ; CHECK:   call i1 @vf(
  ; CHECK: if.false.orig_indirect:
  ; CHECK:   call i1 %fptr(
  call i1 %fptr(ptr %obj), !dbg !14
  ret void
}

@_ZTV1A.local = private unnamed_addr constant { [3 x i32] } { [3 x i32] [
  i32 0,  ; offset to top
  i32 0,  ; rtti
  i32 trunc (i64 sub (i64 ptrtoint (ptr dso_local_equivalent @vf to i64), i64 ptrtoint (ptr getelementptr inbounds ({ [3 x i32] }, ptr @_ZTV1A.local, i32 0, i32 0, i32 2) to i64)) to i32)  ; vf_emptyunc offset
] }, align 4, !type !18

; CHECK: define void @call3
define void @call3(ptr %obj) #1 !dbg !16 {
  %vtable = load ptr, ptr %obj
  %p = call i1 @llvm.type.test(ptr %vtable, metadata !"typeid3")
  call void @llvm.assume(i1 %p)
  %fptr = call ptr @llvm.load.relative.i32(ptr %vtable, i32 8)
  ; CHECK: if.true.direct_targ:
  ; CHECK:   call i1 @vf(
  ; CHECK: if.false.orig_indirect:
  ; CHECK:   call i1 %fptr(
  call i1 %fptr(ptr %obj), !dbg !17
  ret void
}


declare i1 @llvm.type.test(ptr, metadata)
declare i1 @llvm.public.type.test(ptr, metadata)
declare void @llvm.assume(i1)

!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!2, !3}
!llvm.ident = !{!4}

!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 4.0.0 (trunk 278098)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
!1 = !DIFile(filename: "devirt-single.cc", directory: ".")
!2 = !{i32 2, !"Dwarf Version", i32 4}
!3 = !{i32 2, !"Debug Info Version", i32 3}
!4 = !{!"clang version 4.0.0 (trunk 278098)"}
!5 = distinct !DISubprogram(name: "call", linkageName: "_Z4callPv", scope: !1, file: !1, line: 29, type: !19, isLocal: false, isDefinition: true, scopeLine: 9, flags: DIFlagPrototyped, isOptimized: false, unit: !0)
!6 = !DILocation(line: 30, column: 32, scope: !5)
!7 = distinct !DISubprogram(name: "vf", linkageName: "_ZN3vt12vfEv", scope: !1, file: !1, line: 13, type: !19, isLocal: false, isDefinition: true, scopeLine: 13, flags: DIFlagPrototyped, isOptimized: false, unit: !0)
!8 = !{i32 0, !"typeid"}

!9 = distinct !DISubprogram(name: "call1", linkageName: "_Z5call1Pv", scope: !1, file: !1, line: 31, type: !19, isLocal: false, isDefinition: true, scopeLine: 9, flags: DIFlagPrototyped, isOptimized: false, unit: !0)
!10 = !DILocation(line: 35, column: 32, scope: !9)
!11 = distinct !DISubprogram(name: "vf_empty", linkageName: "_ZN3vt18vf_emptyEv", scope: !1, file: !1, line: 23, type: !19, isLocal: false, isDefinition: true, scopeLine: 23, flags: DIFlagPrototyped, isOptimized: false, unit: !0)
!12 = !{i32 0, !"typeid1"}

!13 = distinct !DISubprogram(name: "call2", linkageName: "_Z5call2Pv", scope: !1, file: !1, line: 40, type: !19, isLocal: false, isDefinition: true, scopeLine: 9, flags: DIFlagPrototyped, isOptimized: false, unit: !0)
!14 = !DILocation(line: 41, column: 32, scope: !13)
!15 = !{i32 0, !"typeid2"}

!16 = distinct !DISubprogram(name: "call3", linkageName: "_Z5call3Pv", scope: !1, file: !1, line: 50, type: !19, isLocal: false, isDefinition: true, scopeLine: 9, flags: DIFlagPrototyped, isOptimized: false, unit: !0)
!17 = !DILocation(line: 51, column: 32, scope: !16)
!18 = !{i32 0, !"typeid3"}
!19 = !DISubroutineType(types: !20)
!20 = !{null}



; CHECK: 1 wholeprogramdevirt - Number of whole program devirtualization targets
; CHECK: 3 wholeprogramdevirt - Number of single implementation devirtualizations