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May 13, 2025
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[NFC][WPD] Add constant propagation tests checking relative vtables #138989

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130 changes: 101 additions & 29 deletions llvm/test/Transforms/WholeProgramDevirt/virtual-const-prop-begin.ll
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Original file line number Diff line number Diff line change
@@ -1,34 +1,40 @@
; RUN: opt -S -passes=wholeprogramdevirt -whole-program-visibility %s | FileCheck %s

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

; CHECK: [[VT1DATA:@[^ ]*]] = private constant { [8 x i8], [3 x ptr], [0 x i8] } { [8 x i8] c"\00\00\00\01\00\00\00\02", [3 x ptr] [ptr @vf0i1, ptr @vf1i1, ptr @vf1i32], [0 x i8] zeroinitializer }, section "vt1sec", !type [[T8:![0-9]+]]
;; Note that i16 is used here such that we can ensure all constants for "typeid"
;; can come before the vtable. For this particular file, the intention is to only
;; look at constants placed before the vtable, but with the next change, this
;; would place the original i32s after the vtable due to extra padding needed to
;; preserve alignment. Making them i16s allows them to stay at the beginning of
;; the vtable. There are other tests where there's a mix of constants before and
;; after the vtable but for this file we just want everything before the vtable.
; CHECK: [[VT1DATA:@[^ ]*]] = private constant { [8 x i8], [3 x ptr], [0 x i8] } { [8 x i8] c"\00\00\00\00\00\03\00\02", [3 x ptr] [ptr @vf0i1, ptr @vf1i1, ptr @vf1i16], [0 x i8] zeroinitializer }, section "vt1sec", !type [[T8:![0-9]+]]
@vt1 = constant [3 x ptr] [
ptr @vf0i1,
ptr @vf1i1,
ptr @vf1i32
ptr @vf1i16
], section "vt1sec", !type !0

; CHECK: [[VT2DATA:@[^ ]*]] = private constant { [8 x i8], [3 x ptr], [0 x i8] } { [8 x i8] c"\00\00\00\02\00\00\00\01", [3 x ptr] [ptr @vf1i1, ptr @vf0i1, ptr @vf2i32], [0 x i8] zeroinitializer }, !type [[T8]]
; CHECK: [[VT2DATA:@[^ ]*]] = private constant { [8 x i8], [3 x ptr], [0 x i8] } { [8 x i8] c"\00\00\00\00\00\04\00\01", [3 x ptr] [ptr @vf1i1, ptr @vf0i1, ptr @vf2i16], [0 x i8] zeroinitializer }, !type [[T8]]
@vt2 = constant [3 x ptr] [
ptr @vf1i1,
ptr @vf0i1,
ptr @vf2i32
ptr @vf2i16
], !type !0

; CHECK: [[VT3DATA:@[^ ]*]] = private constant { [5 x i8], [3 x ptr], [0 x i8] } { [5 x i8] c"\03\00\00\00\02", [3 x ptr] [ptr @vf0i1, ptr @vf1i1, ptr @vf3i32], [0 x i8] zeroinitializer }, align 1, !type [[T5:![0-9]+]]
; CHECK: [[VT3DATA:@[^ ]*]] = private constant { [4 x i8], [3 x ptr], [0 x i8] } { [4 x i8] c"\00\05\00\02", [3 x ptr] [ptr @vf0i1, ptr @vf1i1, ptr @vf3i16], [0 x i8] zeroinitializer }, align 2, !type [[T5:![0-9]+]]
@vt3 = constant [3 x ptr] [
ptr @vf0i1,
ptr @vf1i1,
ptr @vf3i32
], align 1, !type !0
ptr @vf3i16
], align 2, !type !0

; CHECK: [[VT4DATA:@[^ ]*]] = private constant { [16 x i8], [3 x ptr], [0 x i8] } { [16 x i8] c"\00\00\00\00\00\00\00\00\00\00\00\04\00\00\00\01", [3 x ptr] [ptr @vf1i1, ptr @vf0i1, ptr @vf4i32], [0 x i8] zeroinitializer }, align 16, !type [[T16:![0-9]+]]
; CHECK: [[VT4DATA:@[^ ]*]] = private constant { [16 x i8], [3 x ptr], [0 x i8] } { [16 x i8] c"\00\00\00\00\00\00\00\00\00\00\00\00\00\06\00\01", [3 x ptr] [ptr @vf1i1, ptr @vf0i1, ptr @vf4i16], [0 x i8] zeroinitializer }, align 16, !type [[T16:![0-9]+]]
@vt4 = constant [3 x ptr] [
ptr @vf1i1,
ptr @vf0i1,
ptr @vf4i32
ptr @vf4i16
], align 16, !type !0

; CHECK: @vt5 = {{.*}}, !type [[T0:![0-9]+]]
Expand All @@ -38,10 +44,35 @@ ptr @__cxa_pure_virtual,
ptr @__cxa_pure_virtual
], !type !0

;; Test relative vtables
; CHECK: [[VT6RELDATA:@[^ ]*]] = private constant { [4 x i8], [3 x i32], [0 x i8] } { [4 x i8] c"\00\00\03\00", [3 x i32] [
; CHECK-SAME: i32 trunc (i64 sub (i64 ptrtoint (ptr dso_local_equivalent @vf0i1 to i64), i64 ptrtoint (ptr @vt6_rel to i64)) to i32),
; CHECK-SAME: i32 trunc (i64 sub (i64 ptrtoint (ptr dso_local_equivalent @vf1i1 to i64), i64 ptrtoint (ptr @vt6_rel to i64)) to i32),
; CHECK-SAME: i32 trunc (i64 sub (i64 ptrtoint (ptr dso_local_equivalent @vf1i16 to i64), i64 ptrtoint (ptr @vt6_rel to i64)) to i32)
; CHECK-SAME: ], [0 x i8] zeroinitializer }, !type [[TREL:![0-9]+]]
@vt6_rel = constant [3 x i32] [
i32 trunc (i64 sub (i64 ptrtoint (ptr dso_local_equivalent @vf0i1 to i64), i64 ptrtoint (ptr @vt6_rel to i64)) to i32),
i32 trunc (i64 sub (i64 ptrtoint (ptr dso_local_equivalent @vf1i1 to i64), i64 ptrtoint (ptr @vt6_rel to i64)) to i32),
i32 trunc (i64 sub (i64 ptrtoint (ptr dso_local_equivalent @vf1i16 to i64), i64 ptrtoint (ptr @vt6_rel to i64)) to i32)
], !type !2

; CHECK: [[VT7RELDATA:@[^ ]*]] = private constant { [4 x i8], [3 x i32], [0 x i8] } { [4 x i8] c"\00\00\04\00", [3 x i32] [
; CHECK-SAME: i32 trunc (i64 sub (i64 ptrtoint (ptr dso_local_equivalent @vf1i1 to i64), i64 ptrtoint (ptr @vt7_rel to i64)) to i32),
; CHECK-SAME: i32 trunc (i64 sub (i64 ptrtoint (ptr dso_local_equivalent @vf0i1 to i64), i64 ptrtoint (ptr @vt7_rel to i64)) to i32),
; CHECK-SAME: i32 trunc (i64 sub (i64 ptrtoint (ptr dso_local_equivalent @vf2i16 to i64), i64 ptrtoint (ptr @vt7_rel to i64)) to i32)
; CHECK-SAME: ], [0 x i8] zeroinitializer }, !type [[TREL]]
@vt7_rel = constant [3 x i32] [
i32 trunc (i64 sub (i64 ptrtoint (ptr dso_local_equivalent @vf1i1 to i64), i64 ptrtoint (ptr @vt7_rel to i64)) to i32),
i32 trunc (i64 sub (i64 ptrtoint (ptr dso_local_equivalent @vf0i1 to i64), i64 ptrtoint (ptr @vt7_rel to i64)) to i32),
i32 trunc (i64 sub (i64 ptrtoint (ptr dso_local_equivalent @vf2i16 to i64), i64 ptrtoint (ptr @vt7_rel to i64)) to i32)
], !type !2

; CHECK: @vt1 = alias [3 x ptr], getelementptr inbounds ({ [8 x i8], [3 x ptr], [0 x i8] }, ptr [[VT1DATA]], i32 0, i32 1)
; CHECK: @vt2 = alias [3 x ptr], getelementptr inbounds ({ [8 x i8], [3 x ptr], [0 x i8] }, ptr [[VT2DATA]], i32 0, i32 1)
; CHECK: @vt3 = alias [3 x ptr], getelementptr inbounds ({ [5 x i8], [3 x ptr], [0 x i8] }, ptr [[VT3DATA]], i32 0, i32 1)
; CHECK: @vt3 = alias [3 x ptr], getelementptr inbounds ({ [4 x i8], [3 x ptr], [0 x i8] }, ptr [[VT3DATA]], i32 0, i32 1)
; CHECK: @vt4 = alias [3 x ptr], getelementptr inbounds ({ [16 x i8], [3 x ptr], [0 x i8] }, ptr [[VT4DATA]], i32 0, i32 1)
; CHECK: @vt6_rel = alias [3 x i32], getelementptr inbounds ({ [4 x i8], [3 x i32], [0 x i8] }, ptr [[VT6RELDATA]], i32 0, i32 1)
; CHECK: @vt7_rel = alias [3 x i32], getelementptr inbounds ({ [4 x i8], [3 x i32], [0 x i8] }, ptr [[VT7RELDATA]], i32 0, i32 1)

define i1 @vf0i1(ptr %this) readnone {
ret i1 0
Expand All @@ -51,20 +82,20 @@ define i1 @vf1i1(ptr %this) readnone {
ret i1 1
}

define i32 @vf1i32(ptr %this) readnone {
ret i32 1
define i16 @vf1i16(ptr %this) readnone {
ret i16 3
}

define i32 @vf2i32(ptr %this) readnone {
ret i32 2
define i16 @vf2i16(ptr %this) readnone {
ret i16 4
}

define i32 @vf3i32(ptr %this) readnone {
ret i32 3
define i16 @vf3i16(ptr %this) readnone {
ret i16 5
}

define i32 @vf4i32(ptr %this) readnone {
ret i32 4
define i16 @vf4i16(ptr %this) readnone {
ret i16 6
}

; CHECK: define i1 @call1(
Expand All @@ -87,7 +118,7 @@ define i1 @call2(ptr %obj) {
%vtable = load ptr, ptr %obj
%p = call i1 @llvm.type.test(ptr %vtable, metadata !"typeid")
call void @llvm.assume(i1 %p)
%fptrptr = getelementptr [3 x ptr], ptr %vtable, i32 0, i32 1
%fptrptr = getelementptr [3 x ptr], ptr %vtable, i16 0, i16 1
%fptr = load ptr, ptr %fptrptr
; CHECK: [[VTGEP2:%[^ ]*]] = getelementptr i8, ptr %vtable, i32 -1
; CHECK: [[VTLOAD2:%[^ ]*]] = load i8, ptr [[VTGEP2]]
Expand All @@ -98,27 +129,68 @@ define i1 @call2(ptr %obj) {
ret i1 %result
}

; CHECK: define i32 @call3(
define i32 @call3(ptr %obj) {
; CHECK: define i16 @call3(
define i16 @call3(ptr %obj) {
%vtable = load ptr, ptr %obj
%p = call i1 @llvm.type.test(ptr %vtable, metadata !"typeid")
call void @llvm.assume(i1 %p)
%fptrptr = getelementptr [3 x ptr], ptr %vtable, i32 0, i32 2
%fptrptr = getelementptr [3 x ptr], ptr %vtable, i16 0, i16 2
%fptr = load ptr, ptr %fptrptr
; CHECK: [[VTGEP3:%[^ ]*]] = getelementptr i8, ptr %vtable, i32 -5
; CHECK: [[VTLOAD3:%[^ ]*]] = load i32, ptr [[VTGEP3]]
%result = call i32 %fptr(ptr %obj)
; CHECK: ret i32 [[VTLOAD3]]
ret i32 %result
; CHECK: [[VTGEP3:%[^ ]*]] = getelementptr i8, ptr %vtable, i32 -3
; CHECK: [[VTLOAD3:%[^ ]*]] = load i16, ptr [[VTGEP3]]
%result = call i16 %fptr(ptr %obj)
; CHECK: ret i16 [[VTLOAD3]]
ret i16 %result
}

; CHECK: define i1 @call1_rel(
define i1 @call1_rel(ptr %obj) {
%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 0)
%result = call i1 %fptr(ptr %obj)
ret i1 %result
; CHECK: [[RES:%[^ ]*]] = icmp eq ptr %vtable, @vt7_rel
; CHECK: ret i1 [[RES]]
}

; CHECK: define i1 @call2_rel(
define i1 @call2_rel(ptr %obj) {
%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 4)
%result = call i1 %fptr(ptr %obj)
ret i1 %result
; CHECK: [[RES:%[^ ]*]] = icmp eq ptr %vtable, @vt6_rel
; CHECK: ret i1 [[RES]]
}

; CHECK: define i16 @call3_rel(
define i16 @call3_rel(ptr %obj) {
%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: [[VTGEP3:%[^ ]*]] = getelementptr i8, ptr %vtable, i32 -2
; CHECK: [[VTLOAD3:%[^ ]*]] = load i16, ptr [[VTGEP3]]
%result = call i16 %fptr(ptr %obj)
; CHECK: ret i16 [[VTLOAD3]]
ret i16 %result
}

declare i1 @llvm.type.test(ptr, metadata)
declare void @llvm.assume(i1)
declare void @__cxa_pure_virtual()
declare ptr @llvm.load.relative.i32(ptr, i32)

; CHECK: [[T8]] = !{i32 8, !"typeid"}
; CHECK: [[T5]] = !{i32 5, !"typeid"}
; CHECK: [[T5]] = !{i32 4, !"typeid"}
; CHECK: [[T16]] = !{i32 16, !"typeid"}
; CHECK: [[T0]] = !{i32 0, !"typeid"}
; CHECK: [[TREL]] = !{i32 4, !"typeid3"}

!0 = !{i32 0, !"typeid"}
!1 = !{i32 0, !"typeid2"}
!2 = !{i32 0, !"typeid3"}
73 changes: 71 additions & 2 deletions llvm/test/Transforms/WholeProgramDevirt/virtual-const-prop-check.ll
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Expand Up @@ -7,13 +7,16 @@
; RUN: opt -S -passes=wholeprogramdevirt -whole-program-visibility -pass-remarks=wholeprogramdevirt -wholeprogramdevirt-skip=vf0i1 %s 2>&1 | FileCheck %s --check-prefix=SKIP
; We have two set of call targets {vf0i1, vf1i1} and {vf1i32, vf2i32, vf3i32, vf4i32}.
; The command below prevents both of them from devirtualization.
; RUN: opt -S -passes=wholeprogramdevirt -whole-program-visibility -pass-remarks=wholeprogramdevirt -wholeprogramdevirt-skip=vf0i1,vf1i32 %s 2>&1 | FileCheck %s --check-prefix=SKIP-ALL
; RUN: opt -S -passes=wholeprogramdevirt -whole-program-visibility -pass-remarks=wholeprogramdevirt -wholeprogramdevirt-skip=vf0i1,vf1i32,vf3i32 %s 2>&1 | FileCheck %s --check-prefix=SKIP-ALL
; Check wildcard
; RUN: opt -S -passes=wholeprogramdevirt -whole-program-visibility -pass-remarks=wholeprogramdevirt -wholeprogramdevirt-skip=vf?i1 %s 2>&1 | FileCheck %s --check-prefix=SKIP

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

; CHECK: remark: <unknown>:0:0: unique-ret-val: devirtualized a call to vf0i1
; CHECK: remark: <unknown>:0:0: unique-ret-val: devirtualized a call to vf1i1
; CHECK: remark: <unknown>:0:0: virtual-const-prop: devirtualized a call to vf3i32
; CHECK: remark: <unknown>:0:0: virtual-const-prop-1-bit: devirtualized a call to vf0i1
; CHECK: remark: <unknown>:0:0: virtual-const-prop-1-bit: devirtualized a call to vf1i1
; CHECK: remark: <unknown>:0:0: virtual-const-prop: devirtualized a call to vf1i32
Expand Down Expand Up @@ -69,10 +72,35 @@ ptr @__cxa_pure_virtual,
ptr @__cxa_pure_virtual
], !type !0

;; Test relative vtables
; CHECK: [[VT6RELDATA:@[^ ]*]] = private constant { [4 x i8], [3 x i32], [0 x i8] } { [4 x i8] c"\03\00\00\00", [3 x i32] [
; CHECK-SAME: i32 trunc (i64 sub (i64 ptrtoint (ptr dso_local_equivalent @vf0i1 to i64), i64 ptrtoint (ptr @vt6_rel to i64)) to i32),
; CHECK-SAME: i32 trunc (i64 sub (i64 ptrtoint (ptr dso_local_equivalent @vf1i1 to i64), i64 ptrtoint (ptr @vt6_rel to i64)) to i32),
; CHECK-SAME: i32 trunc (i64 sub (i64 ptrtoint (ptr dso_local_equivalent @vf3i32 to i64), i64 ptrtoint (ptr @vt6_rel to i64)) to i32)
; CHECK-SAME: ], [0 x i8] zeroinitializer }, !type [[TREL:![0-9]+]]
@vt6_rel = constant [3 x i32] [
i32 trunc (i64 sub (i64 ptrtoint (ptr dso_local_equivalent @vf0i1 to i64), i64 ptrtoint (ptr @vt6_rel to i64)) to i32),
i32 trunc (i64 sub (i64 ptrtoint (ptr dso_local_equivalent @vf1i1 to i64), i64 ptrtoint (ptr @vt6_rel to i64)) to i32),
i32 trunc (i64 sub (i64 ptrtoint (ptr dso_local_equivalent @vf3i32 to i64), i64 ptrtoint (ptr @vt6_rel to i64)) to i32)
], !type !1

; CHECK: [[VT7RELDATA:@[^ ]*]] = private constant { [4 x i8], [3 x i32], [0 x i8] } { [4 x i8] c"\04\00\00\00", [3 x i32] [
; CHECK-SAME: i32 trunc (i64 sub (i64 ptrtoint (ptr dso_local_equivalent @vf1i1 to i64), i64 ptrtoint (ptr @vt7_rel to i64)) to i32),
; CHECK-SAME: i32 trunc (i64 sub (i64 ptrtoint (ptr dso_local_equivalent @vf0i1 to i64), i64 ptrtoint (ptr @vt7_rel to i64)) to i32),
; CHECK-SAME: i32 trunc (i64 sub (i64 ptrtoint (ptr dso_local_equivalent @vf4i32 to i64), i64 ptrtoint (ptr @vt7_rel to i64)) to i32)
; CHECK-SAME: ], [0 x i8] zeroinitializer }, !type [[TREL]]
@vt7_rel = constant [3 x i32] [
i32 trunc (i64 sub (i64 ptrtoint (ptr dso_local_equivalent @vf1i1 to i64), i64 ptrtoint (ptr @vt7_rel to i64)) to i32),
i32 trunc (i64 sub (i64 ptrtoint (ptr dso_local_equivalent @vf0i1 to i64), i64 ptrtoint (ptr @vt7_rel to i64)) to i32),
i32 trunc (i64 sub (i64 ptrtoint (ptr dso_local_equivalent @vf4i32 to i64), i64 ptrtoint (ptr @vt7_rel to i64)) to i32)
], !type !1

; CHECK: @vt1 = alias [3 x ptr], getelementptr inbounds ({ [8 x i8], [3 x ptr], [0 x i8] }, ptr [[VT1DATA]], i32 0, i32 1)
; CHECK: @vt2 = alias [3 x ptr], getelementptr inbounds ({ [8 x i8], [3 x ptr], [0 x i8] }, ptr [[VT2DATA]], i32 0, i32 1)
; CHECK: @vt3 = alias [3 x ptr], getelementptr inbounds ({ [8 x i8], [3 x ptr], [0 x i8] }, ptr [[VT3DATA]], i32 0, i32 1)
; CHECK: @vt4 = alias [3 x ptr], getelementptr inbounds ({ [8 x i8], [3 x ptr], [0 x i8] }, ptr [[VT4DATA]], i32 0, i32 1)
; CHECK: @vt6_rel = alias [3 x i32], getelementptr inbounds ({ [4 x i8], [3 x i32], [0 x i8] }, ptr [[VT6RELDATA]], i32 0, i32 1)
; CHECK: @vt7_rel = alias [3 x i32], getelementptr inbounds ({ [4 x i8], [3 x i32], [0 x i8] }, ptr [[VT7RELDATA]], i32 0, i32 1)

define i1 @vf0i1(ptr %this) readnone {
ret i1 0
Expand Down Expand Up @@ -144,15 +172,56 @@ define i32 @call3(ptr %obj) {
ret i32 %result
}

; CHECK: define i1 @call1_rel(
define i1 @call1_rel(ptr %obj) {
%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)
%result = call i1 %fptr(ptr %obj)
ret i1 %result
; CHECK: [[RES:%[^ ]*]] = icmp eq ptr %vtable, @vt7_rel
; CHECK: ret i1 [[RES]]
}

; CHECK: define i1 @call2_rel(
define i1 @call2_rel(ptr %obj) {
%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 4)
%result = call i1 %fptr(ptr %obj)
ret i1 %result
; CHECK: [[RES:%[^ ]*]] = icmp eq ptr %vtable, @vt6_rel
; CHECK: ret i1 [[RES]]
}

; CHECK: define i32 @call3_rel(
define i32 @call3_rel(ptr %obj) {
%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 8)
; CHECK: [[VTGEP3:%[^ ]*]] = getelementptr i8, ptr %vtable, i32 -4
; CHECK: [[VTLOAD3:%[^ ]*]] = load i32, ptr [[VTGEP3]]
%result = call i32 %fptr(ptr %obj)
; CHECK: ret i32 [[VTLOAD3]]
ret i32 %result
}

declare {ptr, i1} @llvm.type.checked.load(ptr, i32, metadata)
declare void @llvm.assume(i1)
declare void @__cxa_pure_virtual()
declare ptr @llvm.load.relative.i32(ptr, i32)

; CHECK: [[T8]] = !{i32 8, !"typeid"}
; CHECK: [[T0]] = !{i32 0, !"typeid"}
; CHECK: [[TREL]] = !{i32 4, !"typeid2"}

!0 = !{i32 0, !"typeid"}
!1 = !{i32 0, !"typeid2"}

; CHECK: 6 wholeprogramdevirt - Number of whole program devirtualization targets
; CHECK: 1 wholeprogramdevirt - Number of virtual constant propagations
; CHECK: 2 wholeprogramdevirt - Number of unique return value optimizations
; CHECK: 2 wholeprogramdevirt - Number of virtual constant propagations
; CHECK: 2 wholeprogramdevirt - Number of 1 bit virtual constant propagations
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