<div dir="ltr"><div dir="ltr"><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Oct 11, 2023 at 5:33 PM via llvm-commits <<a href="mailto:llvm-commits@lists.llvm.org">llvm-commits@lists.llvm.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><br>
Author: Oskar Wirga<br>
Date: 2023-10-11T17:32:41-07:00<br>
New Revision: b48450c2094fa48d3d968536876fa684eb21f330<br>
<br>
URL: <a href="https://github.com/llvm/llvm-project/commit/b48450c2094fa48d3d968536876fa684eb21f330" rel="noreferrer" target="_blank">https://github.com/llvm/llvm-project/commit/b48450c2094fa48d3d968536876fa684eb21f330</a><br>
DIFF: <a href="https://github.com/llvm/llvm-project/commit/b48450c2094fa48d3d968536876fa684eb21f330.diff" rel="noreferrer" target="_blank">https://github.com/llvm/llvm-project/commit/b48450c2094fa48d3d968536876fa684eb21f330.diff</a><br>
<br>
LOG: [MergeFuncs] Use sizeWithoutDebug to decide if we create a thunk (#68627)<br>
<br>
I noticed that when we determine the size of the function to figure out<br>
if its profitable, we include debug instructions which can end up making<br>
larger functions than necessary.<br>
<br>
Added: <br>
llvm/test/Transforms/MergeFunc/no-merge-debug-thunks.ll<br>
<br>
Modified: <br>
llvm/lib/Transforms/IPO/MergeFunctions.cpp<br>
llvm/test/Transforms/MergeFunc/mergefunc-preserve-debug-info.ll<br>
<br>
Removed: <br>
<br>
<br>
<br>
################################################################################<br>
diff --git a/llvm/lib/Transforms/IPO/MergeFunctions.cpp b/llvm/lib/Transforms/IPO/MergeFunctions.cpp<br>
index 89ddd7b6adebbec..c19cf71ba4c6af3 100644<br>
--- a/llvm/lib/Transforms/IPO/MergeFunctions.cpp<br>
+++ b/llvm/lib/Transforms/IPO/MergeFunctions.cpp<br>
@@ -653,7 +653,7 @@ static bool canCreateThunkFor(Function *F) {<br>
// Don't merge tiny functions using a thunk, since it can just end up<br>
// making the function larger.<br>
if (F->size() == 1) {<br>
- if (F->front().size() <= 2) {<br>
+ if (F->front().sizeWithoutDebug() < 2) {<br></blockquote><div><br>This would also change the size threshold for non-debug builds, though - should it have been `<=` like the old code?<br> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
LLVM_DEBUG(dbgs() << "canCreateThunkFor: " << F->getName()<br>
<< " is too small to bother creating a thunk for\n");<br>
return false;<br>
<br>
diff --git a/llvm/test/Transforms/MergeFunc/mergefunc-preserve-debug-info.ll b/llvm/test/Transforms/MergeFunc/mergefunc-preserve-debug-info.ll<br>
index 13d94f8cf6a257c..72aa647ae0b2bdf 100644<br>
--- a/llvm/test/Transforms/MergeFunc/mergefunc-preserve-debug-info.ll<br>
+++ b/llvm/test/Transforms/MergeFunc/mergefunc-preserve-debug-info.ll<br>
@@ -1,3 +1,4 @@<br>
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 2<br>
; RUN: opt -passes='default<O0>,mergefunc' -S -mergefunc-preserve-debug-info < %s | FileCheck %s --check-prefix=OPTIMIZATION_LEVEL_0<br>
; RUN: opt -passes='default<O2>,mergefunc' -S -mergefunc-preserve-debug-info < %s | FileCheck %s --check-prefix=OPTIMIZATION_LEVEL_2<br>
<br>
@@ -43,6 +44,48 @@<br>
<br>
; Function Attrs: nounwind uwtable<br>
define i32 @maxA(i32 %x, i32 %y) !dbg !6 {<br>
+; OPTIMIZATION_LEVEL_0-LABEL: define i32 @maxA<br>
+; OPTIMIZATION_LEVEL_0-SAME: (i32 [[X:%.*]], i32 [[Y:%.*]]) !dbg [[DBG6:![0-9]+]] {<br>
+; OPTIMIZATION_LEVEL_0-NEXT: entry:<br>
+; OPTIMIZATION_LEVEL_0-NEXT: [[X_ADDR:%.*]] = alloca i32, align 4<br>
+; OPTIMIZATION_LEVEL_0-NEXT: [[Y_ADDR:%.*]] = alloca i32, align 4<br>
+; OPTIMIZATION_LEVEL_0-NEXT: [[I:%.*]] = alloca i32, align 4<br>
+; OPTIMIZATION_LEVEL_0-NEXT: [[M:%.*]] = alloca i32, align 4<br>
+; OPTIMIZATION_LEVEL_0-NEXT: [[J:%.*]] = alloca i32, align 4<br>
+; OPTIMIZATION_LEVEL_0-NEXT: store i32 [[X]], ptr [[X_ADDR]], align 4<br>
+; OPTIMIZATION_LEVEL_0-NEXT: call void @llvm.dbg.declare(metadata ptr [[X_ADDR]], metadata [[META11:![0-9]+]], metadata !DIExpression()), !dbg [[DBG12:![0-9]+]]<br>
+; OPTIMIZATION_LEVEL_0-NEXT: store i32 [[Y]], ptr [[Y_ADDR]], align 4<br>
+; OPTIMIZATION_LEVEL_0-NEXT: call void @llvm.dbg.declare(metadata ptr [[Y_ADDR]], metadata [[META13:![0-9]+]], metadata !DIExpression()), !dbg [[DBG14:![0-9]+]]<br>
+; OPTIMIZATION_LEVEL_0-NEXT: call void @llvm.dbg.declare(metadata ptr [[I]], metadata [[META15:![0-9]+]], metadata !DIExpression()), !dbg [[DBG16:![0-9]+]]<br>
+; OPTIMIZATION_LEVEL_0-NEXT: call void @llvm.dbg.declare(metadata ptr [[M]], metadata [[META17:![0-9]+]], metadata !DIExpression()), !dbg [[DBG18:![0-9]+]]<br>
+; OPTIMIZATION_LEVEL_0-NEXT: call void @llvm.dbg.declare(metadata ptr [[J]], metadata [[META19:![0-9]+]], metadata !DIExpression()), !dbg [[DBG20:![0-9]+]]<br>
+; OPTIMIZATION_LEVEL_0-NEXT: [[TMP0:%.*]] = load i32, ptr [[X_ADDR]], align 4, !dbg [[DBG21:![0-9]+]]<br>
+; OPTIMIZATION_LEVEL_0-NEXT: [[TMP1:%.*]] = load i32, ptr [[Y_ADDR]], align 4, !dbg [[DBG23:![0-9]+]]<br>
+; OPTIMIZATION_LEVEL_0-NEXT: [[CMP:%.*]] = icmp sgt i32 [[TMP0]], [[TMP1]], !dbg [[DBG24:![0-9]+]]<br>
+; OPTIMIZATION_LEVEL_0-NEXT: br i1 [[CMP]], label [[IF_THEN:%.*]], label [[IF_ELSE:%.*]], !dbg [[DBG25:![0-9]+]]<br>
+; OPTIMIZATION_LEVEL_0: if.then:<br>
+; OPTIMIZATION_LEVEL_0-NEXT: [[TMP2:%.*]] = load i32, ptr [[X_ADDR]], align 4, !dbg [[DBG26:![0-9]+]]<br>
+; OPTIMIZATION_LEVEL_0-NEXT: store i32 [[TMP2]], ptr [[M]], align 4, !dbg [[DBG27:![0-9]+]]<br>
+; OPTIMIZATION_LEVEL_0-NEXT: br label [[IF_END:%.*]], !dbg [[DBG28:![0-9]+]]<br>
+; OPTIMIZATION_LEVEL_0: if.else:<br>
+; OPTIMIZATION_LEVEL_0-NEXT: [[TMP3:%.*]] = load i32, ptr [[Y_ADDR]], align 4, !dbg [[DBG29:![0-9]+]]<br>
+; OPTIMIZATION_LEVEL_0-NEXT: store i32 [[TMP3]], ptr [[M]], align 4, !dbg [[DBG30:![0-9]+]]<br>
+; OPTIMIZATION_LEVEL_0-NEXT: br label [[IF_END]]<br>
+; OPTIMIZATION_LEVEL_0: if.end:<br>
+; OPTIMIZATION_LEVEL_0-NEXT: [[TMP4:%.*]] = load i32, ptr [[M]], align 4, !dbg [[DBG31:![0-9]+]]<br>
+; OPTIMIZATION_LEVEL_0-NEXT: ret i32 [[TMP4]], !dbg [[DBG32:![0-9]+]]<br>
+;<br>
+; OPTIMIZATION_LEVEL_2-LABEL: define i32 @maxA<br>
+; OPTIMIZATION_LEVEL_2-SAME: (i32 [[X:%.*]], i32 [[Y:%.*]]) local_unnamed_addr #[[ATTR0:[0-9]+]] !dbg [[DBG6:![0-9]+]] {<br>
+; OPTIMIZATION_LEVEL_2-NEXT: entry:<br>
+; OPTIMIZATION_LEVEL_2-NEXT: call void @llvm.dbg.value(metadata i32 [[X]], metadata [[META11:![0-9]+]], metadata !DIExpression()), !dbg [[DBG12:![0-9]+]]<br>
+; OPTIMIZATION_LEVEL_2-NEXT: call void @llvm.dbg.value(metadata i32 [[Y]], metadata [[META13:![0-9]+]], metadata !DIExpression()), !dbg [[DBG12]]<br>
+; OPTIMIZATION_LEVEL_2-NEXT: call void @llvm.dbg.declare(metadata ptr undef, metadata [[META14:![0-9]+]], metadata !DIExpression()), !dbg [[DBG15:![0-9]+]]<br>
+; OPTIMIZATION_LEVEL_2-NEXT: call void @llvm.dbg.declare(metadata ptr undef, metadata [[META16:![0-9]+]], metadata !DIExpression()), !dbg [[DBG17:![0-9]+]]<br>
+; OPTIMIZATION_LEVEL_2-NEXT: [[X_Y:%.*]] = tail call i32 @llvm.smax.i32(i32 [[X]], i32 [[Y]])<br>
+; OPTIMIZATION_LEVEL_2-NEXT: call void @llvm.dbg.value(metadata i32 [[X_Y]], metadata [[META18:![0-9]+]], metadata !DIExpression()), !dbg [[DBG12]]<br>
+; OPTIMIZATION_LEVEL_2-NEXT: ret i32 [[X_Y]], !dbg [[DBG19:![0-9]+]]<br>
+;<br>
entry:<br>
%x.addr = alloca i32, align 4<br>
%y.addr = alloca i32, align 4<br>
@@ -81,26 +124,27 @@ declare void @llvm.dbg.declare(metadata, metadata, metadata)<br>
<br>
; Function Attrs: nounwind uwtable<br>
define i32 @maxB(i32 %x, i32 %y) !dbg !34 {<br>
+; OPTIMIZATION_LEVEL_0-LABEL: define i32 @maxB<br>
+; OPTIMIZATION_LEVEL_0-SAME: (i32 [[X:%.*]], i32 [[Y:%.*]]) !dbg [[DBG33:![0-9]+]] {<br>
+; OPTIMIZATION_LEVEL_0-NEXT: entry:<br>
+; OPTIMIZATION_LEVEL_0-NEXT: [[X_ADDR:%.*]] = alloca i32, align 4<br>
+; OPTIMIZATION_LEVEL_0-NEXT: [[Y_ADDR:%.*]] = alloca i32, align 4<br>
+; OPTIMIZATION_LEVEL_0-NEXT: store i32 [[X]], ptr [[X_ADDR]], align 4<br>
+; OPTIMIZATION_LEVEL_0-NEXT: call void @llvm.dbg.declare(metadata ptr [[X_ADDR]], metadata [[META34:![0-9]+]], metadata !DIExpression()), !dbg [[DBG35:![0-9]+]]<br>
+; OPTIMIZATION_LEVEL_0-NEXT: store i32 [[Y]], ptr [[Y_ADDR]], align 4<br>
+; OPTIMIZATION_LEVEL_0-NEXT: call void @llvm.dbg.declare(metadata ptr [[Y_ADDR]], metadata [[META36:![0-9]+]], metadata !DIExpression()), !dbg [[DBG37:![0-9]+]]<br>
+; OPTIMIZATION_LEVEL_0-NEXT: [[TMP0:%.*]] = tail call i32 @maxA(i32 [[X]], i32 [[Y]]), !dbg [[DBG38:![0-9]+]]<br>
+; OPTIMIZATION_LEVEL_0-NEXT: ret i32 [[TMP0]], !dbg [[DBG38]]<br>
+;<br>
+; OPTIMIZATION_LEVEL_2-LABEL: define i32 @maxB<br>
+; OPTIMIZATION_LEVEL_2-SAME: (i32 [[X:%.*]], i32 [[Y:%.*]]) local_unnamed_addr #[[ATTR0]] !dbg [[DBG20:![0-9]+]] {<br>
+; OPTIMIZATION_LEVEL_2-NEXT: entry:<br>
+; OPTIMIZATION_LEVEL_2-NEXT: call void @llvm.dbg.value(metadata i32 [[X]], metadata [[META21:![0-9]+]], metadata !DIExpression()), !dbg [[DBG22:![0-9]+]]<br>
+; OPTIMIZATION_LEVEL_2-NEXT: call void @llvm.dbg.value(metadata i32 [[Y]], metadata [[META23:![0-9]+]], metadata !DIExpression()), !dbg [[DBG22]]<br>
+; OPTIMIZATION_LEVEL_2-NEXT: [[TMP0:%.*]] = tail call i32 @maxA(i32 [[X]], i32 [[Y]]) #[[ATTR0]], !dbg [[DBG24:![0-9]+]]<br>
+; OPTIMIZATION_LEVEL_2-NEXT: ret i32 [[TMP0]], !dbg [[DBG24]]<br>
+;<br>
<br>
-; OPTIMIZATION_LEVEL_0: define i32 @maxB(i32 %x, i32 %y)<br>
-; OPTIMIZATION_LEVEL_0-NEXT: entry:<br>
-; OPTIMIZATION_LEVEL_0-NEXT: %x.addr = alloca i32, align 4<br>
-; OPTIMIZATION_LEVEL_0-NEXT: %y.addr = alloca i32, align 4<br>
-; OPTIMIZATION_LEVEL_0-NEXT: store i32 %x, ptr %x.addr, align 4<br>
-; OPTIMIZATION_LEVEL_0-NEXT: call void @llvm.dbg.declare(metadata ptr %x.addr, metadata !{{[0-9]+}}, metadata !DIExpression()), !dbg !{{[0-9]+}}<br>
-; OPTIMIZATION_LEVEL_0-NEXT: store i32 %y, ptr %y.addr, align 4<br>
-; OPTIMIZATION_LEVEL_0-NEXT: call void @llvm.dbg.declare(metadata ptr %y.addr, metadata !{{[0-9]+}}, metadata !DIExpression()), !dbg !{{[0-9]+}}<br>
-; OPTIMIZATION_LEVEL_0-NEXT: %0 = tail call i32 @maxA(i32 %x, i32 %y), !dbg !{{[0-9]+}}<br>
-; OPTIMIZATION_LEVEL_0-NEXT: ret i32 %0, !dbg !{{[0-9]+}}<br>
-; OPTIMIZATION_LEVEL_0-NEXT: }<br>
-<br>
-; OPTIMIZATION_LEVEL_2: define i32 @maxB(i32 %x, i32 %y)<br>
-; OPTIMIZATION_LEVEL_2-NEXT: entry:<br>
-; OPTIMIZATION_LEVEL_2-NEXT: call void @llvm.dbg.value(metadata i32 %x, metadata !{{[0-9]+}}, metadata !DIExpression()), !dbg !{{[0-9]+}}<br>
-; OPTIMIZATION_LEVEL_2-NEXT: call void @llvm.dbg.value(metadata i32 %y, metadata !{{[0-9]+}}, metadata !DIExpression()), !dbg !{{[0-9]+}}<br>
-; OPTIMIZATION_LEVEL_2-NEXT: %0 = tail call i32 @maxA(i32 %x, i32 %y) #{{[0-9]+}}, !dbg !{{[0-9]+}}<br>
-; OPTIMIZATION_LEVEL_2-NEXT: ret i32 %0, !dbg !{{[0-9]+}}<br>
-; OPTIMIZATION_LEVEL_2-NEXT: }<br>
<br>
entry:<br>
%x.addr = alloca i32, align 4<br>
@@ -137,18 +181,19 @@ if.end: ; preds = %if.else, %if.then<br>
<br>
; Function Attrs: nounwind uwtable<br>
define void @f() !dbg !57 {<br>
+; OPTIMIZATION_LEVEL_0-LABEL: define void @f<br>
+; OPTIMIZATION_LEVEL_0-SAME: () !dbg [[DBG39:![0-9]+]] {<br>
+; OPTIMIZATION_LEVEL_0-NEXT: entry:<br>
+; OPTIMIZATION_LEVEL_0-NEXT: [[CALL:%.*]] = call i32 @maxA(i32 3, i32 4), !dbg [[DBG42:![0-9]+]]<br>
+; OPTIMIZATION_LEVEL_0-NEXT: [[CALL1:%.*]] = call i32 @maxB(i32 1, i32 9), !dbg [[DBG43:![0-9]+]]<br>
+; OPTIMIZATION_LEVEL_0-NEXT: ret void, !dbg [[DBG44:![0-9]+]]<br>
+;<br>
+; OPTIMIZATION_LEVEL_2-LABEL: define void @f<br>
+; OPTIMIZATION_LEVEL_2-SAME: () local_unnamed_addr #[[ATTR2:[0-9]+]] !dbg [[DBG25:![0-9]+]] {<br>
+; OPTIMIZATION_LEVEL_2-NEXT: entry:<br>
+; OPTIMIZATION_LEVEL_2-NEXT: ret void, !dbg [[DBG28:![0-9]+]]<br>
+;<br>
entry:<br>
-<br>
-; OPTIMIZATION_LEVEL_0: define void @f()<br>
-; OPTIMIZATION_LEVEL_0-NEXT: entry:<br>
-; OPTIMIZATION_LEVEL_0-NEXT: %call = call i32 @maxA(i32 3, i32 4), !dbg !{{[0-9]+}}<br>
-; OPTIMIZATION_LEVEL_0-NEXT: %call1 = call i32 @maxB(i32 1, i32 9), !dbg !{{[0-9]+}}<br>
-; OPTIMIZATION_LEVEL_0-NEXT: ret void, !dbg !{{[0-9]+}}<br>
-<br>
-; OPTIMIZATION_LEVEL_2: define void @f()<br>
-; OPTIMIZATION_LEVEL_2-NEXT: entry:<br>
-; OPTIMIZATION_LEVEL_2-NEXT: ret void, !dbg !{{[0-9]+}}<br>
-<br>
%call = call i32 @maxA(i32 3, i32 4), !dbg !60<br>
%call1 = call i32 @maxB(i32 1, i32 9), !dbg !61<br>
ret void, !dbg !62<br>
<br>
diff --git a/llvm/test/Transforms/MergeFunc/no-merge-debug-thunks.ll b/llvm/test/Transforms/MergeFunc/no-merge-debug-thunks.ll<br>
new file mode 100644<br>
index 000000000000000..80467c7aee407f8<br>
--- /dev/null<br>
+++ b/llvm/test/Transforms/MergeFunc/no-merge-debug-thunks.ll<br>
@@ -0,0 +1,61 @@<br>
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 2<br>
+;; Make sure debug instructions are not counted when deciding to merge functions<br>
+; RUN: opt -S -passes=mergefunc < %s | FileCheck %s<br>
+<br>
+target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"<br>
+<br>
+; Function Attrs: nounwind readnone<br>
+define hidden i32 @f(i32 %t) {<br>
+; CHECK-LABEL: define hidden i32 @f<br>
+; CHECK-SAME: (i32 [[T:%.*]]) {<br>
+; CHECK-NEXT: entry:<br>
+; CHECK-NEXT: call void @llvm.dbg.value(metadata i32 [[T]], metadata [[META6:![0-9]+]], metadata !DIExpression()), !dbg [[DBG12:![0-9]+]]<br>
+; CHECK-NEXT: call void @llvm.dbg.value(metadata i32 [[T]], metadata [[META6]], metadata !DIExpression()), !dbg [[DBG12]]<br>
+; CHECK-NEXT: ret i32 0<br>
+;<br>
+entry:<br>
+ call void @llvm.dbg.value(metadata i32 %t, metadata !12, metadata !DIExpression()), !dbg !13<br>
+ call void @llvm.dbg.value(metadata i32 %t, metadata !12, metadata !DIExpression()), !dbg !13<br>
+ ret i32 0<br>
+}<br>
+<br>
+; Function Attrs: nounwind readnone<br>
+define hidden i32 @f_thunk(i32 %t) {<br>
+; CHECK-LABEL: define hidden i32 @f_thunk<br>
+; CHECK-SAME: (i32 [[T:%.*]]) {<br>
+; CHECK-NEXT: entry:<br>
+; CHECK-NEXT: call void @llvm.dbg.value(metadata i32 [[T]], metadata [[META6]], metadata !DIExpression()), !dbg [[DBG12]]<br>
+; CHECK-NEXT: call void @llvm.dbg.value(metadata i32 [[T]], metadata [[META6]], metadata !DIExpression()), !dbg [[DBG12]]<br>
+; CHECK-NEXT: ret i32 0<br>
+;<br>
+entry:<br>
+ call void @llvm.dbg.value(metadata i32 %t, metadata !12, metadata !DIExpression()), !dbg !13<br>
+ call void @llvm.dbg.value(metadata i32 %t, metadata !12, metadata !DIExpression()), !dbg !13<br>
+ ret i32 0<br>
+}<br>
+<br>
+; Function Attrs: nounwind readnone speculatable<br>
+declare void @llvm.dbg.value(metadata, metadata, metadata)<br>
+<br>
+!<a href="http://llvm.dbg.cu" rel="noreferrer" target="_blank">llvm.dbg.cu</a> = !{!0}<br>
+!llvm.module.flags = !{!3, !4, !5}<br>
+<br>
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)<br>
+!1 = !DIFile(filename: "no-merge-debug-thunks.c", directory: "/tmp")<br>
+!2 = !{}<br>
+!3 = !{i32 2, !"Dwarf Version", i32 4}<br>
+!4 = !{i32 2, !"Debug Info Version", i32 3}<br>
+!5 = !{i32 1, !"wchar_size", i32 4}<br>
+!7 = distinct !DISubprogram(name: "test", scope: !1, file: !1, line: 3, type: !8, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !11)<br>
+!8 = !DISubroutineType(types: !9)<br>
+!9 = !{!10, !10}<br>
+!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)<br>
+!11 = !{!12}<br>
+!12 = !DILocalVariable(name: "t", arg: 1, scope: !7, file: !1, line: 3, type: !10)<br>
+!13 = !DILocation(line: 3, column: 14, scope: !7)<br>
+!14 = !DILocation(line: 4, column: 12, scope: !7)<br>
+!16 = distinct !DISubprogram(name: "_start", scope: !1, file: !1, line: 7, type: !17, isLocal: false, isDefinition: true, scopeLine: 7, isOptimized: true, unit: !0, retainedNodes: !2)<br>
+!17 = !DISubroutineType(types: !18)<br>
+!18 = !{!10}<br>
+!19 = !DILocation(line: 8, column: 3, scope: !16)<br>
+!20 = !DILocation(line: 9, column: 3, scope: !16)<br>
<br>
<br>
<br>
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</blockquote></div></div>