Apply backports from rust-lang/llvm#47, #48, #53, #54

llvm.spec

@@ -7,7 +7,7 @@
 
 Name:		llvm
 Version:	3.9.0
-Release:	2%{?dist}
+Release:	3%{?dist}
 Summary:	The Low Level Virtual Machine
 
 License:	NCSA
@@ -23,7 +23,13 @@ Patch1:		0001-This-code-block-breaks-the-docs-build-http-lab.llvm..patch
 Patch2:		0001-fix-docs-2.patch
 Patch3:		0001-fix-docs-3.patch
 Patch4:		0001-docs-fix-cmake-code-block-warning.patch
-Patch5:		0001-Backport-rL281650.patch
+
+# backports cribbed from https://github.com/rust-lang/llvm/
+Patch47:	rust-lang-llvm-pr47.patch
+Patch48:	rust-lang-llvm-pr48.patch
+Patch51:	rust-lang-llvm-pr51.patch
+Patch53:	rust-lang-llvm-pr53.patch
+Patch54:	rust-lang-llvm-pr54.patch
 
 BuildRequires:	cmake
 BuildRequires:	zlib-devel
@@ -80,7 +86,11 @@ Static libraries for the LLVM compiler infrastructure.
 %patch2 -p1 -b .docs2
 %patch3 -p1 -b .docs3
 %patch4 -p1 -b .docs4
-%patch5 -p1 -b .rust1
+%patch47 -p1 -b .rust47
+%patch48 -p1 -b .rust48
+%patch51 -p1 -b .rust51
+%patch53 -p1 -b .rust53
+%patch54 -p1 -b .rust54
 
 %build
 mkdir -p _build
@@ -196,6 +206,9 @@ make check-all || :
 %{_libdir}/*.a
 
 %changelog
+* Mon Oct 17 2016 Josh Stone <jistone@redhat.com> - 3.9.0-3
+- Apply backports from rust-lang/llvm#47, #48, #53, #54
+
 * Sat Oct 15 2016 Josh Stone <jistone@redhat.com> - 3.9.0-2
 - Apply an InstCombine backport via rust-lang/llvm#51
 

rust-lang-llvm-pr47.patch

@@ -0,0 +1,272 @@
+From ae32815f9281a5a8d48014e180901fcdb658285a Mon Sep 17 00:00:00 2001
+From: David Majnemer <david.majnemer@gmail.com>
+Date: Sun, 7 Aug 2016 07:58:00 +0000
+Subject: [rust-lang/llvm#47 1/4] [InstCombine] Infer inbounds on geps of
+ allocas
+
+git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@277950 91177308-0d34-0410-b5e6-96231b3b80d8
+---
+ lib/Transforms/InstCombine/InstructionCombining.cpp | 19 +++++++++++++++++++
+ test/Transforms/InstCombine/getelementptr.ll        |  6 +++---
+ 2 files changed, 22 insertions(+), 3 deletions(-)
+
+diff --git a/lib/Transforms/InstCombine/InstructionCombining.cpp b/lib/Transforms/InstCombine/InstructionCombining.cpp
+index 377ccb9c37f7..31b5ad6ae8af 100644
+--- a/lib/Transforms/InstCombine/InstructionCombining.cpp
++++ b/lib/Transforms/InstCombine/InstructionCombining.cpp
+@@ -1898,6 +1898,25 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
+     }
+   }
+ 
++  if (!GEP.isInBounds()) {
++    unsigned PtrWidth =
++        DL.getPointerSizeInBits(PtrOp->getType()->getPointerAddressSpace());
++    APInt BasePtrOffset(PtrWidth, 0);
++    Value *UnderlyingPtrOp =
++            PtrOp->stripAndAccumulateInBoundsConstantOffsets(DL,
++                                                             BasePtrOffset);
++    if (auto *AI = dyn_cast<AllocaInst>(UnderlyingPtrOp)) {
++      if (GEP.accumulateConstantOffset(DL, BasePtrOffset) &&
++          BasePtrOffset.isNonNegative()) {
++        APInt AllocSize(PtrWidth, DL.getTypeAllocSize(AI->getAllocatedType()));
++        if (BasePtrOffset.ule(AllocSize)) {
++          return GetElementPtrInst::CreateInBounds(
++              PtrOp, makeArrayRef(Ops).slice(1), GEP.getName());
++        }
++      }
++    }
++  }
++
+   return nullptr;
+ }
+ 
+diff --git a/test/Transforms/InstCombine/getelementptr.ll b/test/Transforms/InstCombine/getelementptr.ll
+index 7446734e210c..14abd84fd18e 100644
+--- a/test/Transforms/InstCombine/getelementptr.ll
++++ b/test/Transforms/InstCombine/getelementptr.ll
+@@ -366,7 +366,7 @@ define i32 @test21() {
+         %rval = load i32, i32* %pbobel
+         ret i32 %rval
+ ; CHECK-LABEL: @test21(
+-; CHECK: getelementptr %intstruct, %intstruct* %pbob1, i64 0, i32 0
++; CHECK: getelementptr inbounds %intstruct, %intstruct* %pbob1, i64 0, i32 0
+ }
+ 
+ 
+@@ -540,8 +540,8 @@ define i8* @test32(i8* %v) {
+ 	%G = load i8*, i8** %F
+ 	ret i8* %G
+ ; CHECK-LABEL: @test32(
+-; CHECK: %D = getelementptr [4 x i8*], [4 x i8*]* %A, i64 0, i64 1
+-; CHECK: %F = getelementptr [4 x i8*], [4 x i8*]* %A, i64 0, i64 2
++; CHECK: %D = getelementptr inbounds [4 x i8*], [4 x i8*]* %A, i64 0, i64 1
++; CHECK: %F = getelementptr inbounds [4 x i8*], [4 x i8*]* %A, i64 0, i64 2
+ }
+ 
+ ; PR3290
+-- 
+2.7.4
+
+From d31c987130ff1bf9cea9a287195ecceda91c37d1 Mon Sep 17 00:00:00 2001
+From: David Majnemer <david.majnemer@gmail.com>
+Date: Sun, 7 Aug 2016 07:58:10 +0000
+Subject: [rust-lang/llvm#47 2/4] [InstSimplify] Try hard to simplify pointer
+ comparisons
+
+Simplify ptrtoint comparisons involving operands with different source
+types.
+
+git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@277951 91177308-0d34-0410-b5e6-96231b3b80d8
+---
+ lib/Analysis/InstructionSimplify.cpp    | 10 ++++++++++
+ test/Transforms/InstSimplify/compare.ll | 13 +++++++++++++
+ 2 files changed, 23 insertions(+)
+
+diff --git a/lib/Analysis/InstructionSimplify.cpp b/lib/Analysis/InstructionSimplify.cpp
+index 7c6edbfca270..8b70d89d62cb 100644
+--- a/lib/Analysis/InstructionSimplify.cpp
++++ b/lib/Analysis/InstructionSimplify.cpp
+@@ -3092,6 +3092,16 @@ static Value *SimplifyICmpInst(unsigned Predicate, Value *LHS, Value *RHS,
+   if (LHS->getType()->isPointerTy())
+     if (auto *C = computePointerICmp(Q.DL, Q.TLI, Q.DT, Pred, Q.CxtI, LHS, RHS))
+       return C;
++  if (auto *CLHS = dyn_cast<PtrToIntOperator>(LHS))
++    if (auto *CRHS = dyn_cast<PtrToIntOperator>(RHS))
++      if (Q.DL.getTypeSizeInBits(CLHS->getPointerOperandType()) ==
++              Q.DL.getTypeSizeInBits(CLHS->getType()) &&
++          Q.DL.getTypeSizeInBits(CRHS->getPointerOperandType()) ==
++              Q.DL.getTypeSizeInBits(CRHS->getType()))
++        if (auto *C = computePointerICmp(Q.DL, Q.TLI, Q.DT, Pred, Q.CxtI,
++                                         CLHS->getPointerOperand(),
++                                         CRHS->getPointerOperand()))
++          return C;
+ 
+   if (GetElementPtrInst *GLHS = dyn_cast<GetElementPtrInst>(LHS)) {
+     if (GEPOperator *GRHS = dyn_cast<GEPOperator>(RHS)) {
+diff --git a/test/Transforms/InstSimplify/compare.ll b/test/Transforms/InstSimplify/compare.ll
+index 9d6fd74ae56f..3e7316ec6b48 100644
+--- a/test/Transforms/InstSimplify/compare.ll
++++ b/test/Transforms/InstSimplify/compare.ll
+@@ -205,6 +205,19 @@ define i1 @gep16(i8* %ptr, i32 %a) {
+ ; CHECK-NEXT: ret i1 false
+ }
+ 
++define i1 @gep17() {
++; CHECK-LABEL: @gep17(
++  %alloca = alloca i32, align 4
++  %bc = bitcast i32* %alloca to [4 x i8]*
++  %gep1 = getelementptr inbounds i32, i32* %alloca, i32 1
++  %pti1 = ptrtoint i32* %gep1 to i32
++  %gep2 = getelementptr inbounds [4 x i8], [4 x i8]* %bc, i32 0, i32 1
++  %pti2 = ptrtoint i8* %gep2 to i32
++  %cmp = icmp ugt i32 %pti1, %pti2
++  ret i1 %cmp
++; CHECK-NEXT: ret i1 true
++}
++
+ define i1 @zext(i32 %x) {
+ ; CHECK-LABEL: @zext(
+   %e1 = zext i32 %x to i64
+-- 
+2.7.4
+
+From bd3e05cb1f5293635edff14fcf23cfc73985c977 Mon Sep 17 00:00:00 2001
+From: David Majnemer <david.majnemer@gmail.com>
+Date: Sun, 7 Aug 2016 07:58:12 +0000
+Subject: [rust-lang/llvm#47 3/4] [InstSimplify] Fold gep (gep V, C), (sub 0,
+ V) to C
+
+git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@277952 91177308-0d34-0410-b5e6-96231b3b80d8
+---
+ lib/Analysis/InstructionSimplify.cpp    | 20 ++++++++++++++++++++
+ test/Transforms/InstSimplify/compare.ll | 13 +++++++++++++
+ 2 files changed, 33 insertions(+)
+
+diff --git a/lib/Analysis/InstructionSimplify.cpp b/lib/Analysis/InstructionSimplify.cpp
+index 8b70d89d62cb..9d2a47957125 100644
+--- a/lib/Analysis/InstructionSimplify.cpp
++++ b/lib/Analysis/InstructionSimplify.cpp
+@@ -3597,6 +3597,26 @@ static Value *SimplifyGEPInst(Type *SrcTy, ArrayRef<Value *> Ops,
+     }
+   }
+ 
++  // gep (gep V, C), (sub 0, V) -> C
++  if (Q.DL.getTypeAllocSize(LastType) == 1 &&
++      all_of(Ops.slice(1).drop_back(1),
++             [](Value *Idx) { return match(Idx, m_Zero()); })) {
++    unsigned PtrWidth =
++        Q.DL.getPointerSizeInBits(Ops[0]->getType()->getPointerAddressSpace());
++    if (Q.DL.getTypeSizeInBits(Ops.back()->getType()) == PtrWidth) {
++      APInt BasePtrOffset(PtrWidth, 0);
++      Value *StrippedBasePtr =
++          Ops[0]->stripAndAccumulateInBoundsConstantOffsets(Q.DL,
++                                                            BasePtrOffset);
++
++      if (match(Ops.back(),
++                m_Sub(m_Zero(), m_PtrToInt(m_Specific(StrippedBasePtr))))) {
++        auto *CI = ConstantInt::get(GEPTy->getContext(), BasePtrOffset);
++        return ConstantExpr::getIntToPtr(CI, GEPTy);
++      }
++    }
++  }
++
+   // Check to see if this is constant foldable.
+   for (unsigned i = 0, e = Ops.size(); i != e; ++i)
+     if (!isa<Constant>(Ops[i]))
+diff --git a/test/Transforms/InstSimplify/compare.ll b/test/Transforms/InstSimplify/compare.ll
+index 3e7316ec6b48..addb63c57222 100644
+--- a/test/Transforms/InstSimplify/compare.ll
++++ b/test/Transforms/InstSimplify/compare.ll
+@@ -218,6 +218,19 @@ define i1 @gep17() {
+ ; CHECK-NEXT: ret i1 true
+ }
+ 
++define i32 @gep18() {
++; CHECK-LABEL: @gep18(
++  %alloca = alloca i32, align 4                                     ; alloca + 0
++  %gep = getelementptr inbounds i32, i32* %alloca, i32 1            ; alloca + 4
++  %bc = bitcast i32* %gep to [4 x i8]*                              ; alloca + 4
++  %pti = ptrtoint i32* %alloca to i32                               ; alloca
++  %sub = sub i32 0, %pti                                            ; -alloca
++  %add = getelementptr [4 x i8], [4 x i8]* %bc, i32 0, i32 %sub     ; alloca + 4 - alloca == 4
++  %add_to_int = ptrtoint i8* %add to i32                            ; 4
++  ret i32 %add_to_int                                               ; 4
++; CHECK-NEXT: ret i32 4
++}
++
+ define i1 @zext(i32 %x) {
+ ; CHECK-LABEL: @zext(
+   %e1 = zext i32 %x to i64
+-- 
+2.7.4
+
+From c3eb3c7608f439231d0c1340af6b720f113b4bf4 Mon Sep 17 00:00:00 2001
+From: David Majnemer <david.majnemer@gmail.com>
+Date: Tue, 16 Aug 2016 06:13:46 +0000
+Subject: [rust-lang/llvm#47 4/4] [InstSimplify] Fold gep (gep V, C), (xor V,
+ -1) to C-1
+
+git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@278779 91177308-0d34-0410-b5e6-96231b3b80d8
+---
+ lib/Analysis/InstructionSimplify.cpp    |  8 +++++++-
+ test/Transforms/InstSimplify/compare.ll | 13 -------------
+ 2 files changed, 7 insertions(+), 14 deletions(-)
+
+diff --git a/lib/Analysis/InstructionSimplify.cpp b/lib/Analysis/InstructionSimplify.cpp
+index 9d2a47957125..f7a435d1ad46 100644
+--- a/lib/Analysis/InstructionSimplify.cpp
++++ b/lib/Analysis/InstructionSimplify.cpp
+@@ -3597,7 +3597,6 @@ static Value *SimplifyGEPInst(Type *SrcTy, ArrayRef<Value *> Ops,
+     }
+   }
+ 
+-  // gep (gep V, C), (sub 0, V) -> C
+   if (Q.DL.getTypeAllocSize(LastType) == 1 &&
+       all_of(Ops.slice(1).drop_back(1),
+              [](Value *Idx) { return match(Idx, m_Zero()); })) {
+@@ -3609,11 +3608,18 @@ static Value *SimplifyGEPInst(Type *SrcTy, ArrayRef<Value *> Ops,
+           Ops[0]->stripAndAccumulateInBoundsConstantOffsets(Q.DL,
+                                                             BasePtrOffset);
+ 
++      // gep (gep V, C), (sub 0, V) -> C
+       if (match(Ops.back(),
+                 m_Sub(m_Zero(), m_PtrToInt(m_Specific(StrippedBasePtr))))) {
+         auto *CI = ConstantInt::get(GEPTy->getContext(), BasePtrOffset);
+         return ConstantExpr::getIntToPtr(CI, GEPTy);
+       }
++      // gep (gep V, C), (xor V, -1) -> C-1
++      if (match(Ops.back(),
++                m_Xor(m_PtrToInt(m_Specific(StrippedBasePtr)), m_AllOnes()))) {
++        auto *CI = ConstantInt::get(GEPTy->getContext(), BasePtrOffset - 1);
++        return ConstantExpr::getIntToPtr(CI, GEPTy);
++      }
+     }
+   }
+ 
+diff --git a/test/Transforms/InstSimplify/compare.ll b/test/Transforms/InstSimplify/compare.ll
+index addb63c57222..3e7316ec6b48 100644
+--- a/test/Transforms/InstSimplify/compare.ll
++++ b/test/Transforms/InstSimplify/compare.ll
+@@ -218,19 +218,6 @@ define i1 @gep17() {
+ ; CHECK-NEXT: ret i1 true
+ }
+ 
+-define i32 @gep18() {
+-; CHECK-LABEL: @gep18(
+-  %alloca = alloca i32, align 4                                     ; alloca + 0
+-  %gep = getelementptr inbounds i32, i32* %alloca, i32 1            ; alloca + 4
+-  %bc = bitcast i32* %gep to [4 x i8]*                              ; alloca + 4
+-  %pti = ptrtoint i32* %alloca to i32                               ; alloca
+-  %sub = sub i32 0, %pti                                            ; -alloca
+-  %add = getelementptr [4 x i8], [4 x i8]* %bc, i32 0, i32 %sub     ; alloca + 4 - alloca == 4
+-  %add_to_int = ptrtoint i8* %add to i32                            ; 4
+-  ret i32 %add_to_int                                               ; 4
+-; CHECK-NEXT: ret i32 4
+-}
+-
+ define i1 @zext(i32 %x) {
+ ; CHECK-LABEL: @zext(
+   %e1 = zext i32 %x to i64
+-- 
+2.7.4
+

rust-lang-llvm-pr48.patch

@@ -0,0 +1,84 @@
+From eee68eafa7e8e4ce996b49f5551636639a6c331a Mon Sep 17 00:00:00 2001
+From: David Majnemer <david.majnemer@gmail.com>
+Date: Mon, 29 Aug 2016 17:14:08 +0000
+Subject: [rust-lang/llvm#48] [SimplifyCFG] Hoisting invalidates metadata
+
+We forgot to remove optimization metadata when performing hosting during
+FoldTwoEntryPHINode.
+
+This fixes PR29163.
+
+git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@279980 91177308-0d34-0410-b5e6-96231b3b80d8
+---
+ lib/Transforms/Utils/SimplifyCFG.cpp   | 10 ++++++++--
+ test/Transforms/SimplifyCFG/PR29163.ll | 31 +++++++++++++++++++++++++++++++
+ 2 files changed, 39 insertions(+), 2 deletions(-)
+ create mode 100644 test/Transforms/SimplifyCFG/PR29163.ll
+
+diff --git a/lib/Transforms/Utils/SimplifyCFG.cpp b/lib/Transforms/Utils/SimplifyCFG.cpp
+index 0504646c304e..c197317ac771 100644
+--- a/lib/Transforms/Utils/SimplifyCFG.cpp
++++ b/lib/Transforms/Utils/SimplifyCFG.cpp
+@@ -2024,14 +2024,20 @@ static bool FoldTwoEntryPHINode(PHINode *PN, const TargetTransformInfo &TTI,
+ 
+   // Move all 'aggressive' instructions, which are defined in the
+   // conditional parts of the if's up to the dominating block.
+-  if (IfBlock1)
++  if (IfBlock1) {
++    for (auto &I : *IfBlock1)
++      I.dropUnknownNonDebugMetadata();
+     DomBlock->getInstList().splice(InsertPt->getIterator(),
+                                    IfBlock1->getInstList(), IfBlock1->begin(),
+                                    IfBlock1->getTerminator()->getIterator());
+-  if (IfBlock2)
++  }
++  if (IfBlock2) {
++    for (auto &I : *IfBlock2)
++      I.dropUnknownNonDebugMetadata();
+     DomBlock->getInstList().splice(InsertPt->getIterator(),
+                                    IfBlock2->getInstList(), IfBlock2->begin(),
+                                    IfBlock2->getTerminator()->getIterator());
++  }
+ 
+   while (PHINode *PN = dyn_cast<PHINode>(BB->begin())) {
+     // Change the PHI node into a select instruction.
+diff --git a/test/Transforms/SimplifyCFG/PR29163.ll b/test/Transforms/SimplifyCFG/PR29163.ll
+new file mode 100644
+index 000000000000..65f9090dd135
+--- /dev/null
++++ b/test/Transforms/SimplifyCFG/PR29163.ll
+@@ -0,0 +1,31 @@
++; RUN: opt -S -simplifycfg < %s | FileCheck %s
++target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
++target triple = "x86_64-unknown-linux-gnu"
++
++@GV = external constant i64*
++
++define i64* @test1(i1 %cond, i8* %P) {
++entry:
++  br i1 %cond, label %if, label %then
++
++then:
++  %bc = bitcast i8* %P to i64*
++  br label %join
++
++if:
++  %load = load i64*, i64** @GV, align 8, !dereferenceable !0
++  br label %join
++
++join:
++  %phi = phi i64* [ %bc, %then ], [ %load, %if ]
++  ret i64* %phi
++}
++
++; CHECK-LABEL: define i64* @test1(
++; CHECK: %[[bc:.*]] = bitcast i8* %P to i64*
++; CHECK: %[[load:.*]] = load i64*, i64** @GV, align 8{{$}}
++; CHECK: %[[phi:.*]] = select i1 %cond, i64* %[[load]], i64* %[[bc]]
++; CHECK: ret i64* %[[phi]]
++
++
++!0 = !{i64 8}
+-- 
+2.7.4
+

rust-lang-llvm-pr51.patch

@@ -1,7 +1,7 @@
 From 7801978ec1f3637fcda1b564048ebc732bf586af Mon Sep 17 00:00:00 2001
 From: Simonas Kazlauskas <git@kazlauskas.me>
 Date: Fri, 16 Sep 2016 00:32:20 +0300
-Subject: [PATCH] Backport rL281650
+Subject: [rust-lang/llvm#51] Backport rL281650
 
 ---
  lib/Transforms/InstCombine/InstCombineCompares.cpp  |  2 +-

rust-lang-llvm-pr53.patch

@@ -0,0 +1,883 @@
+From 0d4331af6e01235479e44f9775b3fde9e19200a3 Mon Sep 17 00:00:00 2001
+From: Keith Walker <kwalker@arm.com>
+Date: Tue, 27 Sep 2016 16:46:07 +0000
+Subject: [rust-lang/llvm#53 1/2] Propagate DBG_VALUE entries when there are
+ unvisited predecessors
+
+Variables are sometimes missing their debug location information in
+blocks in which the variables should be available. This would occur
+when one or more predecessor blocks had not yet been visited by the
+routine which propagated the information from predecessor blocks.
+
+This is addressed by only considering predecessor blocks which have
+already been visited.
+
+The solution to this problem was suggested by Daniel Berlin on the
+LLVM developer mailing list.
+
+Differential Revision: https://reviews.llvm.org/D24927
+
+
+git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@282506 91177308-0d34-0410-b5e6-96231b3b80d8
+---
+ lib/CodeGen/LiveDebugValues.cpp          |  34 ++--
+ test/CodeGen/ARM/dbg-range-extension.mir | 282 +++++++++++++++++++++++++++++++
+ 2 files changed, 306 insertions(+), 10 deletions(-)
+ create mode 100644 test/CodeGen/ARM/dbg-range-extension.mir
+
+diff --git a/lib/CodeGen/LiveDebugValues.cpp b/lib/CodeGen/LiveDebugValues.cpp
+index 4ff88d528108..4cadd5855ed5 100644
+--- a/lib/CodeGen/LiveDebugValues.cpp
++++ b/lib/CodeGen/LiveDebugValues.cpp
+@@ -201,7 +201,8 @@ private:
+                 VarLocInMBB &OutLocs, VarLocMap &VarLocIDs);
+ 
+   bool join(MachineBasicBlock &MBB, VarLocInMBB &OutLocs, VarLocInMBB &InLocs,
+-            const VarLocMap &VarLocIDs);
++            const VarLocMap &VarLocIDs,
++            SmallPtrSet<const MachineBasicBlock *, 16> &Visited);
+ 
+   bool ExtendRanges(MachineFunction &MF);
+ 
+@@ -368,7 +369,8 @@ bool LiveDebugValues::transfer(MachineInstr &MI, OpenRangesSet &OpenRanges,
+ /// inserting a new DBG_VALUE instruction at the start of the @MBB - if the same
+ /// source variable in all the predecessors of @MBB reside in the same location.
+ bool LiveDebugValues::join(MachineBasicBlock &MBB, VarLocInMBB &OutLocs,
+-                           VarLocInMBB &InLocs, const VarLocMap &VarLocIDs) {
++                           VarLocInMBB &InLocs, const VarLocMap &VarLocIDs,
++                           SmallPtrSet<const MachineBasicBlock *, 16> &Visited) {
+   DEBUG(dbgs() << "join MBB: " << MBB.getName() << "\n");
+   bool Changed = false;
+ 
+@@ -376,21 +378,32 @@ bool LiveDebugValues::join(MachineBasicBlock &MBB, VarLocInMBB &OutLocs,
+ 
+   // For all predecessors of this MBB, find the set of VarLocs that
+   // can be joined.
++  int NumVisited = 0;
+   for (auto p : MBB.predecessors()) {
++    // Ignore unvisited predecessor blocks.  As we are processing
++    // the blocks in reverse post-order any unvisited block can
++    // be considered to not remove any incoming values.
++    if (!Visited.count(p))
++      continue;
+     auto OL = OutLocs.find(p);
+     // Join is null in case of empty OutLocs from any of the pred.
+     if (OL == OutLocs.end())
+       return false;
+ 
+-    // Just copy over the Out locs to incoming locs for the first predecessor.
+-    if (p == *MBB.pred_begin()) {
++    // Just copy over the Out locs to incoming locs for the first visited
++    // predecessor, and for all other predecessors join the Out locs.
++    if (!NumVisited)
+       InLocsT = OL->second;
+-      continue;
+-    }
+-    // Join with this predecessor.
+-    InLocsT &= OL->second;
++    else
++      InLocsT &= OL->second;
++    NumVisited++;
+   }
+ 
++  // As we are processing blocks in reverse post-order we
++  // should have processed at least one predecessor, unless it
++  // is the entry block which has no predecessor.
++  assert((NumVisited || MBB.pred_empty()) &&
++         "Should have processed at least one predecessor");
+   if (InLocsT.empty())
+     return false;
+ 
+@@ -463,6 +476,7 @@ bool LiveDebugValues::ExtendRanges(MachineFunction &MF) {
+   // To solve it, we perform join() and transfer() using the two worklist method
+   // until the ranges converge.
+   // Ranges have converged when both worklists are empty.
++  SmallPtrSet<const MachineBasicBlock *, 16> Visited;
+   while (!Worklist.empty() || !Pending.empty()) {
+     // We track what is on the pending worklist to avoid inserting the same
+     // thing twice.  We could avoid this with a custom priority queue, but this
+@@ -471,8 +485,8 @@ bool LiveDebugValues::ExtendRanges(MachineFunction &MF) {
+     while (!Worklist.empty()) {
+       MachineBasicBlock *MBB = OrderToBB[Worklist.top()];
+       Worklist.pop();
+-      MBBJoined = join(*MBB, OutLocs, InLocs, VarLocIDs);
+-
++      MBBJoined = join(*MBB, OutLocs, InLocs, VarLocIDs, Visited);
++      Visited.insert(MBB);
+       if (MBBJoined) {
+         MBBJoined = false;
+         Changed = true;
+diff --git a/test/CodeGen/ARM/dbg-range-extension.mir b/test/CodeGen/ARM/dbg-range-extension.mir
+new file mode 100644
+index 000000000000..b18f56197948
+--- /dev/null
++++ b/test/CodeGen/ARM/dbg-range-extension.mir
+@@ -0,0 +1,282 @@
++# RUN: llc -mtriple=arm-eabi -run-pass=livedebugvalues %s -o - | FileCheck %s
++#
++# Check that the debug information for variables are propagated into the correct blocks.
++#
++# Generated from the C source:
++#
++# int func2(int,  int);
++# void func(int a) {
++#   int b = func2(10, 11);
++#   if (a) {
++#     int c = func2(12, 13);
++#     for(int i = 1; i < a; i++) {
++#       func2(i, i+b);
++#     }
++#     func2(b,c);
++#   }
++#   func2(b,a);
++# }
++
++# CHECK: [[VAR_A:![0-9]+]] = !DILocalVariable(name: "a",
++# CHECK: [[VAR_B:![0-9]+]] = !DILocalVariable(name: "b",
++# CHECK: [[VAR_C:![0-9]+]] = !DILocalVariable(name: "c",
++# CHECK: [[VAR_I:![0-9]+]] = !DILocalVariable(name: "i",
++
++# CHECK: bb.0.entry
++# CHECK: DBG_VALUE debug-use %r0, debug-use _, [[VAR_A]]
++# CHECK: DBG_VALUE debug-use [[REG_A:%r[0-9]+]], debug-use _, [[VAR_A]]
++# CHECK: DBG_VALUE debug-use [[REG_B:%r[0-9]+]], debug-use _, [[VAR_B]]
++
++# CHECK: bb.1.if.then
++# CHECK: DBG_VALUE debug-use [[REG_B]], debug-use _, [[VAR_B]]
++# CHECK: DBG_VALUE debug-use [[REG_A]], debug-use _, [[VAR_A]]
++# CHECK: DBG_VALUE debug-use [[REG_C:%r[0-9]+]], debug-use _, [[VAR_C]]
++# CHECK: DBG_VALUE 1, 0, [[VAR_I]]
++
++# CHECK: bb.2.for.body
++# CHECK: DBG_VALUE debug-use [[REG_I:%r[0-9]+]], debug-use _, [[VAR_I]]
++# CHECK: DBG_VALUE debug-use [[REG_C]], debug-use _, [[VAR_C]]
++# CHECK: DBG_VALUE debug-use [[REG_B]], debug-use _, [[VAR_B]]
++# CHECK: DBG_VALUE debug-use [[REG_A]], debug-use _, [[VAR_A]]
++# CHECK: DBG_VALUE debug-use [[REG_I]], debug-use _, [[VAR_I]]
++
++# CHECK: bb.3.for.cond
++# CHECK: DBG_VALUE debug-use [[REG_C]], debug-use _, [[VAR_C]]
++# CHECK: DBG_VALUE debug-use [[REG_B]], debug-use _, [[VAR_B]]
++# CHECK: DBG_VALUE debug-use [[REG_A]], debug-use _, [[VAR_A]]
++# CHECK: DBG_VALUE debug-use [[REG_I]], debug-use _, [[VAR_I]]
++
++# CHECK: bb.4.for.cond.cleanup
++# CHECK: DBG_VALUE debug-use [[REG_I]], debug-use _, [[VAR_I]]
++# CHECK: DBG_VALUE debug-use [[REG_C]], debug-use _, [[VAR_C]]
++# CHECK: DBG_VALUE debug-use [[REG_B]], debug-use _, [[VAR_B]]
++# CHECK: DBG_VALUE debug-use [[REG_A]], debug-use _, [[VAR_A]]
++
++# CHECK: bb.5.if.end
++# CHECK: DBG_VALUE debug-use [[REG_B]], debug-use _, [[VAR_B]]
++# CHECK: DBG_VALUE debug-use [[REG_A]], debug-use _, [[VAR_A]]
++--- |
++  ; ModuleID = '/data/kwalker/work/OpenSource-llvm/llvm/test/CodeGen/ARM/dbg-range-extension.ll'
++  source_filename = "/data/kwalker/work/OpenSource-llvm/llvm/test/CodeGen/ARM/dbg-range-extension.ll"
++  target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
++  target triple = "arm---eabi"
++  
++  ; Function Attrs: minsize nounwind optsize
++  define void @func(i32 %a) local_unnamed_addr #0 !dbg !8 {
++  entry:
++    tail call void @llvm.dbg.value(metadata i32 %a, i64 0, metadata !13, metadata !20), !dbg !21
++    %call = tail call i32 @func2(i32 10, i32 11) #0, !dbg !22
++    tail call void @llvm.dbg.value(metadata i32 %call, i64 0, metadata !14, metadata !20), !dbg !23
++    %tobool = icmp eq i32 %a, 0, !dbg !24
++    br i1 %tobool, label %if.end, label %if.then, !dbg !25
++  
++  if.then:                                          ; preds = %entry
++    %call1 = tail call i32 @func2(i32 12, i32 13) #0, !dbg !26
++    tail call void @llvm.dbg.value(metadata i32 %call1, i64 0, metadata !15, metadata !20), !dbg !27
++    tail call void @llvm.dbg.value(metadata i32 1, i64 0, metadata !18, metadata !20), !dbg !28
++    br label %for.cond, !dbg !29
++  
++  for.cond:                                         ; preds = %for.body, %if.then
++    %i.0 = phi i32 [ 1, %if.then ], [ %inc, %for.body ]
++    tail call void @llvm.dbg.value(metadata i32 %i.0, i64 0, metadata !18, metadata !20), !dbg !28
++    %cmp = icmp slt i32 %i.0, %a, !dbg !30
++    br i1 %cmp, label %for.body, label %for.cond.cleanup, !dbg !33
++  
++  for.cond.cleanup:                                 ; preds = %for.cond
++    %call3 = tail call i32 @func2(i32 %call, i32 %call1) #0, !dbg !34
++    br label %if.end, !dbg !35
++  
++  for.body:                                         ; preds = %for.cond
++    %0 = add i32 %call, %i.0, !dbg !36
++    %call2 = tail call i32 @func2(i32 %i.0, i32 %0) #0, !dbg !36
++    %inc = add nuw nsw i32 %i.0, 1, !dbg !38
++    tail call void @llvm.dbg.value(metadata i32 %inc, i64 0, metadata !18, metadata !20), !dbg !28
++    br label %for.cond, !dbg !40, !llvm.loop !41
++  
++  if.end:                                           ; preds = %for.cond.cleanup, %entry
++    %call4 = tail call i32 @func2(i32 %call, i32 %a) #0, !dbg !43
++    ret void, !dbg !44
++  }
++  
++  ; Function Attrs: minsize optsize
++  declare i32 @func2(i32, i32) local_unnamed_addr #1
++  
++  ; Function Attrs: nounwind readnone
++  declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #2
++  
++  ; Function Attrs: nounwind
++  declare void @llvm.stackprotector(i8*, i8**) #3
++  
++  attributes #0 = { minsize nounwind optsize }
++  attributes #1 = { minsize optsize }
++  attributes #2 = { nounwind readnone }
++  attributes #3 = { nounwind }
++  
++  !llvm.dbg.cu = !{!0}
++  !llvm.module.flags = !{!3, !4, !5, !6}
++  !llvm.ident = !{!7}
++  
++  !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
++  !1 = !DIFile(filename: "loop.c", directory: "/tmp")
++  !2 = !{}
++  !3 = !{i32 2, !"Dwarf Version", i32 4}
++  !4 = !{i32 2, !"Debug Info Version", i32 3}
++  !5 = !{i32 1, !"wchar_size", i32 4}
++  !6 = !{i32 1, !"min_enum_size", i32 4}
++  !7 = !{!"clang version 4.0.0 (http://llvm.org/git/clang.git b8f10df3679b36f51e1de7c4351b82d297825089) (http://llvm.org/git/llvm.git c2a5d16d1e3b8c49f5bbb1ff87a76ac4f88edb89)"}
++  !8 = distinct !DISubprogram(name: "func", scope: !1, file: !1, line: 2, type: !9, isLocal: false, isDefinition: true, scopeLine: 2, flags: DIFlagPrototyped, isOptimized: true, unit: !0, variables: !12)
++  !9 = !DISubroutineType(types: !10)
++  !10 = !{null, !11}
++  !11 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
++  !12 = !{!13, !14, !15, !18}
++  !13 = !DILocalVariable(name: "a", arg: 1, scope: !8, file: !1, line: 2, type: !11)
++  !14 = !DILocalVariable(name: "b", scope: !8, file: !1, line: 3, type: !11)
++  !15 = !DILocalVariable(name: "c", scope: !16, file: !1, line: 5, type: !11)
++  !16 = distinct !DILexicalBlock(scope: !17, file: !1, line: 4, column: 9)
++  !17 = distinct !DILexicalBlock(scope: !8, file: !1, line: 4, column: 6)
++  !18 = !DILocalVariable(name: "i", scope: !19, file: !1, line: 6, type: !11)
++  !19 = distinct !DILexicalBlock(scope: !16, file: !1, line: 6, column: 3)
++  !20 = !DIExpression()
++  !21 = !DILocation(line: 2, column: 15, scope: !8)
++  !22 = !DILocation(line: 3, column: 17, scope: !8)
++  !23 = !DILocation(line: 3, column: 13, scope: !8)
++  !24 = !DILocation(line: 4, column: 6, scope: !17)
++  !25 = !DILocation(line: 4, column: 6, scope: !8)
++  !26 = !DILocation(line: 5, column: 11, scope: !16)
++  !27 = !DILocation(line: 5, column: 7, scope: !16)
++  !28 = !DILocation(line: 6, column: 11, scope: !19)
++  !29 = !DILocation(line: 6, column: 7, scope: !19)
++  !30 = !DILocation(line: 6, column: 20, scope: !31)
++  !31 = !DILexicalBlockFile(scope: !32, file: !1, discriminator: 1)
++  !32 = distinct !DILexicalBlock(scope: !19, file: !1, line: 6, column: 3)
++  !33 = !DILocation(line: 6, column: 3, scope: !31)
++  !34 = !DILocation(line: 9, column: 3, scope: !16)
++  !35 = !DILocation(line: 10, column: 2, scope: !16)
++  !36 = !DILocation(line: 7, column: 4, scope: !37)
++  !37 = distinct !DILexicalBlock(scope: !32, file: !1, line: 6, column: 30)
++  !38 = !DILocation(line: 6, column: 26, scope: !39)
++  !39 = !DILexicalBlockFile(scope: !32, file: !1, discriminator: 3)
++  !40 = !DILocation(line: 6, column: 3, scope: !39)
++  !41 = distinct !{!41, !42}
++  !42 = !DILocation(line: 6, column: 3, scope: !16)
++  !43 = !DILocation(line: 11, column: 2, scope: !8)
++  !44 = !DILocation(line: 12, column: 1, scope: !8)
++
++...
++---
++name:            func
++alignment:       2
++exposesReturnsTwice: false
++legalized:       false
++regBankSelected: false
++selected:        false
++tracksRegLiveness: false
++liveins:         
++  - { reg: '%r0' }
++calleeSavedRegisters: [ '%lr', '%d8', '%d9', '%d10', '%d11', '%d12', '%d13', 
++                        '%d14', '%d15', '%q4', '%q5', '%q6', '%q7', '%r4', 
++                        '%r5', '%r6', '%r7', '%r8', '%r9', '%r10', '%r11', 
++                        '%s16', '%s17', '%s18', '%s19', '%s20', '%s21', 
++                        '%s22', '%s23', '%s24', '%s25', '%s26', '%s27', 
++                        '%s28', '%s29', '%s30', '%s31', '%d8_d10', '%d9_d11', 
++                        '%d10_d12', '%d11_d13', '%d12_d14', '%d13_d15', 
++                        '%q4_q5', '%q5_q6', '%q6_q7', '%q4_q5_q6_q7', '%r4_r5', 
++                        '%r6_r7', '%r8_r9', '%r10_r11', '%d8_d9_d10', '%d9_d10_d11', 
++                        '%d10_d11_d12', '%d11_d12_d13', '%d12_d13_d14', 
++                        '%d13_d14_d15', '%d8_d10_d12', '%d9_d11_d13', '%d10_d12_d14', 
++                        '%d11_d13_d15', '%d8_d10_d12_d14', '%d9_d11_d13_d15', 
++                        '%d9_d10', '%d11_d12', '%d13_d14', '%d9_d10_d11_d12', 
++                        '%d11_d12_d13_d14' ]
++frameInfo:       
++  isFrameAddressTaken: false
++  isReturnAddressTaken: false
++  hasStackMap:     false
++  hasPatchPoint:   false
++  stackSize:       24
++  offsetAdjustment: 0
++  maxAlignment:    4
++  adjustsStack:    true
++  hasCalls:        true
++  maxCallFrameSize: 0
++  hasOpaqueSPAdjustment: false
++  hasVAStart:      false
++  hasMustTailInVarArgFunc: false
++stack:           
++  - { id: 0, type: spill-slot, offset: -4, size: 4, alignment: 4, callee-saved-register: '%lr' }
++  - { id: 1, type: spill-slot, offset: -8, size: 4, alignment: 4, callee-saved-register: '%r11' }
++  - { id: 2, type: spill-slot, offset: -12, size: 4, alignment: 4, callee-saved-register: '%r7' }
++  - { id: 3, type: spill-slot, offset: -16, size: 4, alignment: 4, callee-saved-register: '%r6' }
++  - { id: 4, type: spill-slot, offset: -20, size: 4, alignment: 4, callee-saved-register: '%r5' }
++  - { id: 5, type: spill-slot, offset: -24, size: 4, alignment: 4, callee-saved-register: '%r4' }
++body:             |
++  bb.0.entry:
++    successors: %bb.5.if.end, %bb.1.if.then
++    liveins: %r0, %r4, %r5, %r6, %r7, %r11, %lr
++  
++    %sp = frame-setup STMDB_UPD %sp, 14, _, killed %r4, killed %r5, killed %r6, killed %r7, killed %r11, killed %lr
++    frame-setup CFI_INSTRUCTION def_cfa_offset 24
++    frame-setup CFI_INSTRUCTION offset %lr, -4
++    frame-setup CFI_INSTRUCTION offset %r11, -8
++    frame-setup CFI_INSTRUCTION offset %r7, -12
++    frame-setup CFI_INSTRUCTION offset %r6, -16
++    frame-setup CFI_INSTRUCTION offset %r5, -20
++    frame-setup CFI_INSTRUCTION offset %r4, -24
++    DBG_VALUE debug-use %r0, debug-use _, !13, !20, debug-location !21
++    %r4 = MOVr killed %r0, 14, _, _
++    DBG_VALUE debug-use %r4, debug-use _, !13, !20, debug-location !21
++    %r0 = MOVi 10, 14, _, _, debug-location !22
++    %r1 = MOVi 11, 14, _, _, debug-location !22
++    BL @func2, csr_aapcs, implicit-def dead %lr, implicit %sp, implicit killed %r0, implicit killed %r1, implicit-def %sp, implicit-def %r0, debug-location !22
++    %r5 = MOVr killed %r0, 14, _, _, debug-location !22
++    DBG_VALUE debug-use %r5, debug-use _, !14, !20, debug-location !23
++    CMPri %r4, 0, 14, _, implicit-def %cpsr, debug-location !25
++    Bcc %bb.5.if.end, 0, killed %cpsr
++  
++  bb.1.if.then:
++    successors: %bb.3.for.cond
++    liveins: %r4, %r5
++  
++    %r0 = MOVi 12, 14, _, _, debug-location !26
++    %r1 = MOVi 13, 14, _, _, debug-location !26
++    BL @func2, csr_aapcs, implicit-def dead %lr, implicit %sp, implicit killed %r0, implicit killed %r1, implicit-def %sp, implicit-def %r0, debug-location !26
++    %r6 = MOVr killed %r0, 14, _, _, debug-location !26
++    DBG_VALUE debug-use %r6, debug-use _, !15, !20, debug-location !27
++    %r7 = MOVi 1, 14, _, _
++    DBG_VALUE 1, 0, !18, !20, debug-location !28
++    B %bb.3.for.cond
++  
++  bb.2.for.body:
++    successors: %bb.3.for.cond
++    liveins: %r4, %r5, %r6, %r7
++  
++    %r1 = ADDrr %r5, %r7, 14, _, _, debug-location !36
++    %r0 = MOVr %r7, 14, _, _, debug-location !36
++    BL @func2, csr_aapcs, implicit-def dead %lr, implicit %sp, implicit killed %r0, implicit killed %r1, implicit-def %sp, implicit-def dead %r0, debug-location !36
++    %r7 = ADDri killed %r7, 1, 14, _, _, debug-location !38
++    DBG_VALUE debug-use %r7, debug-use _, !18, !20, debug-location !28
++  
++  bb.3.for.cond:
++    successors: %bb.2.for.body, %bb.4.for.cond.cleanup
++    liveins: %r4, %r5, %r6, %r7
++  
++    DBG_VALUE debug-use %r7, debug-use _, !18, !20, debug-location !28
++    CMPrr %r7, %r4, 14, _, implicit-def %cpsr, debug-location !33
++    Bcc %bb.2.for.body, 11, killed %cpsr, debug-location !33
++  
++  bb.4.for.cond.cleanup:
++    successors: %bb.5.if.end
++    liveins: %r4, %r5, %r6
++  
++    %r0 = MOVr %r5, 14, _, _, debug-location !34
++    %r1 = MOVr killed %r6, 14, _, _, debug-location !34
++    BL @func2, csr_aapcs, implicit-def dead %lr, implicit %sp, implicit killed %r0, implicit killed %r1, implicit-def %sp, implicit-def dead %r0, debug-location !34
++  
++  bb.5.if.end:
++    liveins: %r4, %r5
++  
++    %r0 = MOVr killed %r5, 14, _, _, debug-location !43
++    %r1 = MOVr killed %r4, 14, _, _, debug-location !43
++    %sp = LDMIA_UPD %sp, 14, _, def %r4, def %r5, def %r6, def %r7, def %r11, def %lr, debug-location !43
++    TAILJMPd @func2, implicit %sp, implicit %sp, implicit killed %r0, implicit killed %r1, debug-location !43
++
++...
+-- 
+2.7.4
+
+From 8a0fc26559123bb6eab3ceae93d5a2c94943614b Mon Sep 17 00:00:00 2001
+From: Adrian Prantl <aprantl@apple.com>
+Date: Wed, 28 Sep 2016 17:51:14 +0000
+Subject: [rust-lang/llvm#53 2/2] Teach LiveDebugValues about lexical scopes.
+
+This addresses PR26055 LiveDebugValues is very slow.
+
+Contrary to the old LiveDebugVariables pass LiveDebugValues currently
+doesn't look at the lexical scopes before inserting a DBG_VALUE
+intrinsic. This means that we often propagate DBG_VALUEs much further
+down than necessary. This is especially noticeable in large C++
+functions with many inlined method calls that all use the same
+"this"-pointer.
+
+For example, in the following code it makes no sense to propagate the
+inlined variable a from the first inlined call to f() into any of the
+subsequent basic blocks, because the variable will always be out of
+scope:
+
+void sink(int a);
+void __attribute((always_inline)) f(int a) { sink(a); }
+void foo(int i) {
+   f(i);
+   if (i)
+     f(i);
+   f(i);
+}
+
+This patch reuses the LexicalScopes infrastructure we have for
+LiveDebugVariables to take this into account.
+
+The effect on compile time and memory consumption is quite noticeable:
+I tested a benchmark that is a large C++ source with an enormous
+amount of inlined "this"-pointers that would previously eat >24GiB
+(most of them for DBG_VALUE intrinsics) and whose compile time was
+dominated by LiveDebugValues. With this patch applied the memory
+consumption is 1GiB and 1.7% of the time is spent in LiveDebugValues.
+
+https://reviews.llvm.org/D24994
+Thanks to Daniel Berlin and Keith Walker for reviewing!
+
+git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@282611 91177308-0d34-0410-b5e6-96231b3b80d8
+---
+ lib/CodeGen/LiveDebugValues.cpp                  |  51 ++++-
+ test/CodeGen/ARM/dbg-range-extension.mir         |   1 -
+ test/DebugInfo/COFF/register-variables.ll        |   8 +-
+ test/DebugInfo/MIR/X86/livedebugvalues-limit.mir | 228 +++++++++++++++++++++++
+ test/DebugInfo/X86/fission-ranges.ll             |   6 +-
+ 5 files changed, 278 insertions(+), 16 deletions(-)
+ create mode 100644 test/DebugInfo/MIR/X86/livedebugvalues-limit.mir
+
+diff --git a/lib/CodeGen/LiveDebugValues.cpp b/lib/CodeGen/LiveDebugValues.cpp
+index 4cadd5855ed5..969944eb24a2 100644
+--- a/lib/CodeGen/LiveDebugValues.cpp
++++ b/lib/CodeGen/LiveDebugValues.cpp
+@@ -23,6 +23,7 @@
+ #include "llvm/ADT/SparseBitVector.h"
+ #include "llvm/ADT/Statistic.h"
+ #include "llvm/ADT/UniqueVector.h"
++#include "llvm/CodeGen/LexicalScopes.h"
+ #include "llvm/CodeGen/MachineFunction.h"
+ #include "llvm/CodeGen/MachineFunctionPass.h"
+ #include "llvm/CodeGen/MachineInstrBuilder.h"
+@@ -60,6 +61,26 @@ class LiveDebugValues : public MachineFunctionPass {
+ private:
+   const TargetRegisterInfo *TRI;
+   const TargetInstrInfo *TII;
++  LexicalScopes LS;
++
++  /// Keeps track of lexical scopes associated with a user value's source
++  /// location.
++  class UserValueScopes {
++    DebugLoc DL;
++    LexicalScopes &LS;
++    SmallPtrSet<const MachineBasicBlock *, 4> LBlocks;
++
++  public:
++    UserValueScopes(DebugLoc D, LexicalScopes &L) : DL(std::move(D)), LS(L) {}
++
++    /// Return true if current scope dominates at least one machine
++    /// instruction in a given machine basic block.
++    bool dominates(MachineBasicBlock *MBB) {
++      if (LBlocks.empty())
++        LS.getMachineBasicBlocks(DL, LBlocks);
++      return LBlocks.count(MBB) != 0 || LS.dominates(DL, MBB);
++    }
++  };
+ 
+   /// Based on std::pair so it can be used as an index into a DenseMap.
+   typedef std::pair<const DILocalVariable *, const DILocation *>
+@@ -83,7 +104,7 @@ private:
+   struct VarLoc {
+     const DebugVariable Var;
+     const MachineInstr &MI; ///< Only used for cloning a new DBG_VALUE.
+-
++    mutable UserValueScopes UVS;
+     enum { InvalidKind = 0, RegisterKind } Kind;
+ 
+     /// The value location. Stored separately to avoid repeatedly
+@@ -96,9 +117,9 @@ private:
+       uint64_t Hash;
+     } Loc;
+ 
+-    VarLoc(const MachineInstr &MI)
++    VarLoc(const MachineInstr &MI, LexicalScopes &LS)
+         : Var(MI.getDebugVariable(), MI.getDebugLoc()->getInlinedAt()), MI(MI),
+-          Kind(InvalidKind) {
++          UVS(MI.getDebugLoc(), LS), Kind(InvalidKind) {
+       static_assert((sizeof(Loc) == sizeof(uint64_t)),
+                     "hash does not cover all members of Loc");
+       assert(MI.isDebugValue() && "not a DBG_VALUE");
+@@ -125,6 +146,10 @@ private:
+       return 0;
+     }
+ 
++    /// Determine whether the lexical scope of this value's debug location
++    /// dominates MBB.
++    bool dominates(MachineBasicBlock &MBB) const { return UVS.dominates(&MBB); }
++
+     void dump() const { MI.dump(); }
+ 
+     bool operator==(const VarLoc &Other) const {
+@@ -229,6 +254,7 @@ public:
+   /// Calculate the liveness information for the given machine function.
+   bool runOnMachineFunction(MachineFunction &MF) override;
+ };
++
+ } // namespace
+ 
+ //===----------------------------------------------------------------------===//
+@@ -295,7 +321,7 @@ void LiveDebugValues::transferDebugValue(const MachineInstr &MI,
+   // Add the VarLoc to OpenRanges from this DBG_VALUE.
+   // TODO: Currently handles DBG_VALUE which has only reg as location.
+   if (isDbgValueDescribedByReg(MI)) {
+-    VarLoc VL(MI);
++    VarLoc VL(MI, LS);
+     unsigned ID = VarLocIDs.insert(VL);
+     OpenRanges.insert(ID, VL.Var);
+   }
+@@ -399,6 +425,13 @@ bool LiveDebugValues::join(MachineBasicBlock &MBB, VarLocInMBB &OutLocs,
+     NumVisited++;
+   }
+ 
++  // Filter out DBG_VALUES that are out of scope.
++  VarLocSet KillSet;
++  for (auto ID : InLocsT)
++    if (!VarLocIDs[ID].dominates(MBB))
++      KillSet.set(ID);
++  InLocsT.intersectWithComplement(KillSet);
++
+   // As we are processing blocks in reverse post-order we
+   // should have processed at least one predecessor, unless it
+   // is the entry block which has no predecessor.
+@@ -519,12 +552,14 @@ bool LiveDebugValues::ExtendRanges(MachineFunction &MF) {
+ }
+ 
+ bool LiveDebugValues::runOnMachineFunction(MachineFunction &MF) {
++  if (!MF.getFunction()->getSubprogram())
++    // LiveDebugValues will already have removed all DBG_VALUEs.
++    return false;
++
+   TRI = MF.getSubtarget().getRegisterInfo();
+   TII = MF.getSubtarget().getInstrInfo();
++  LS.initialize(MF);
+ 
+-  bool Changed = false;
+-
+-  Changed |= ExtendRanges(MF);
+-
++  bool Changed = ExtendRanges(MF);
+   return Changed;
+ }
+diff --git a/test/CodeGen/ARM/dbg-range-extension.mir b/test/CodeGen/ARM/dbg-range-extension.mir
+index b18f56197948..466f69396948 100644
+--- a/test/CodeGen/ARM/dbg-range-extension.mir
++++ b/test/CodeGen/ARM/dbg-range-extension.mir
+@@ -47,7 +47,6 @@
+ # CHECK: DBG_VALUE debug-use [[REG_I]], debug-use _, [[VAR_I]]
+ 
+ # CHECK: bb.4.for.cond.cleanup
+-# CHECK: DBG_VALUE debug-use [[REG_I]], debug-use _, [[VAR_I]]
+ # CHECK: DBG_VALUE debug-use [[REG_C]], debug-use _, [[VAR_C]]
+ # CHECK: DBG_VALUE debug-use [[REG_B]], debug-use _, [[VAR_B]]
+ # CHECK: DBG_VALUE debug-use [[REG_A]], debug-use _, [[VAR_A]]
+diff --git a/test/DebugInfo/COFF/register-variables.ll b/test/DebugInfo/COFF/register-variables.ll
+index 9bb782853a3d..08246fef9603 100644
+--- a/test/DebugInfo/COFF/register-variables.ll
++++ b/test/DebugInfo/COFF/register-variables.ll
+@@ -37,8 +37,8 @@
+ ; ASM:         #DEBUG_VALUE: c <- %EAX
+ ; ASM:         testl   %esi, %esi
+ ; ASM:         je      .LBB0_2
++; ASM: [[after_je:\.Ltmp.*]]:
+ ; ASM: # BB#1:                                 # %if.then
+-; ASM-DAG:     #DEBUG_VALUE: c <- %EAX
+ ; ASM-DAG:     #DEBUG_VALUE: inlineinc:a <- %EAX
+ ; ASM-DAG:     #DEBUG_VALUE: a <- %EAX
+ ; ASM-DAG:     #DEBUG_VALUE: f:p <- %ESI
+@@ -65,7 +65,7 @@
+ ; ASM:         .cv_def_range    [[after_getint]] [[after_inc_eax]], "A\021\021\000\000\000"
+ ; ASM:         .short  4414                    # Record kind: S_LOCAL
+ ; ASM:         .asciz  "c"
+-; ASM:         .cv_def_range    [[after_getint]] [[after_inc_eax]], "A\021\021\000\000\000"
++; ASM:         .cv_def_range    [[after_getint]] [[after_je]], "A\021\021\000\000\000"
+ ; ASM:         .short  4414                    # Record kind: S_LOCAL
+ ; ASM:         .asciz  "b"
+ ; ASM:         .cv_def_range    [[after_inc_eax]] [[after_if]], "A\021\021\000\000\000"
+@@ -132,7 +132,7 @@
+ ; OBJ:     LocalVariableAddrRange {
+ ; OBJ:       OffsetStart: .text+0xC
+ ; OBJ:       ISectStart: 0x0
+-; OBJ:       Range: 0x6
++; OBJ:       Range: 0x4
+ ; OBJ:     }
+ ; OBJ:   }
+ ; OBJ:   Local {
+@@ -143,7 +143,7 @@
+ ; OBJ:   }
+ ; OBJ:   DefRangeRegister {
+ ; OBJ:     Register: 17
+-; OBJ:     LocalVariableAddrRange {
++; OBJ:     MayHaveNoName: 0
+ ; OBJ:       OffsetStart: .text+0x12
+ ; OBJ:       ISectStart: 0x0
+ ; OBJ:       Range: 0x6
+diff --git a/test/DebugInfo/MIR/X86/livedebugvalues-limit.mir b/test/DebugInfo/MIR/X86/livedebugvalues-limit.mir
+new file mode 100644
+index 000000000000..4c87543636d5
+--- /dev/null
++++ b/test/DebugInfo/MIR/X86/livedebugvalues-limit.mir
+@@ -0,0 +1,228 @@
++--- |
++  ; RUN: llc -run-pass=livedebugvalues -march=x86-64 -o - %s | FileCheck %s
++  ; Created from:
++  ; void sink(int a);
++  ; void __attribute((always_inline)) f(int a) { sink(a); }
++  ; void foo(int i) {
++  ;   f(i);
++  ;   if (i)
++  ;     f(i);
++  ;   f(i);
++  ; }
++  ;
++  ; This test verifies that LiveDebugValues doesn't propagate DBG_VALUEs into
++  ; basic blocks that are beyond the scope of the source variable.
++  ;
++  ; CHECK:  bb.1.if.then:
++  ; CHECK:      DBG_VALUE debug-use %ebx, debug-use _, !19, !13, debug-location !20
++  ; CHECK-NOT:  DBG_VALUE debug-use %ebx, debug-use _, !12, !13, debug-location !21
++  ; CHECK:      DBG_VALUE debug-use %ebx, debug-use _, !12, !13, debug-location !27
++  ; CHECK: bb.2.if.end:
++  ; CHECK:     DBG_VALUE debug-use %ebx, debug-use _, !19, !13, debug-location !20
++  ; CHECK-NOT: DBG_VALUE debug-use %ebx, debug-use _, !12, !13, debug-location !21
++  ; CHECK:     DBG_VALUE debug-use %ebx, debug-use _, !12, !13, debug-location !31
++  ;
++  ; ModuleID = 'livedebugvalues-limit.ll'
++  source_filename = "livedebugvalues-limit.c"
++  target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
++  target triple = "x86_64-apple-macosx"
++  
++  ; Function Attrs: alwaysinline nounwind ssp uwtable
++  define void @f(i32 %a) local_unnamed_addr #0 !dbg !7 {
++  entry:
++    tail call void @llvm.dbg.value(metadata i32 %a, i64 0, metadata !12, metadata !13), !dbg !14
++    tail call void @sink(i32 %a) #4, !dbg !15
++    ret void, !dbg !16
++  }
++  
++  declare void @sink(i32) local_unnamed_addr
++  
++  ; Function Attrs: nounwind ssp uwtable
++  define void @foo(i32 %i) local_unnamed_addr #2 !dbg !17 {
++  entry:
++    tail call void @llvm.dbg.value(metadata i32 %i, i64 0, metadata !19, metadata !13), !dbg !20
++    tail call void @llvm.dbg.value(metadata i32 %i, i64 0, metadata !12, metadata !13) #4, !dbg !21
++    tail call void @sink(i32 %i) #4, !dbg !23
++    %tobool = icmp eq i32 %i, 0, !dbg !24
++    br i1 %tobool, label %if.end, label %if.then, !dbg !26
++  
++  if.then:                                          ; preds = %entry
++    tail call void @llvm.dbg.value(metadata i32 %i, i64 0, metadata !12, metadata !13) #4, !dbg !27
++    tail call void @sink(i32 %i) #4, !dbg !29
++    br label %if.end, !dbg !30
++  
++  if.end:                                           ; preds = %if.then, %entry
++    tail call void @llvm.dbg.value(metadata i32 %i, i64 0, metadata !12, metadata !13) #4, !dbg !31
++    tail call void @sink(i32 %i) #4, !dbg !33
++    ret void, !dbg !34
++  }
++  
++  ; Function Attrs: nounwind readnone
++  declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #3
++  
++  ; Function Attrs: nounwind
++  declare void @llvm.stackprotector(i8*, i8**) #4
++  
++  attributes #0 = { alwaysinline nounwind ssp uwtable }
++  attributes #2 = { nounwind ssp uwtable }
++  attributes #3 = { nounwind readnone }
++  attributes #4 = { nounwind }
++  
++  !llvm.dbg.cu = !{!0}
++  !llvm.module.flags = !{!3, !4, !5}
++  !llvm.ident = !{!6}
++  
++  !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 4.0.0 (trunk 281923) (llvm/trunk 281916)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
++  !1 = !DIFile(filename: "livedebugvalues-limit.c", directory: "/Volumes/Fusion/Data/llvm")
++  !2 = !{}
++  !3 = !{i32 2, !"Dwarf Version", i32 4}
++  !4 = !{i32 2, !"Debug Info Version", i32 3}
++  !5 = !{i32 1, !"PIC Level", i32 2}
++  !6 = !{!"clang version 4.0.0 (trunk 281923) (llvm/trunk 281916)"}
++  !7 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 3, type: !8, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: true, unit: !0, variables: !11)
++  !8 = !DISubroutineType(types: !9)
++  !9 = !{null, !10}
++  !10 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
++  !11 = !{!12}
++  !12 = !DILocalVariable(name: "a", arg: 1, scope: !7, file: !1, line: 3, type: !10)
++  !13 = !DIExpression()
++  !14 = !DILocation(line: 3, column: 41, scope: !7)
++  !15 = !DILocation(line: 3, column: 46, scope: !7)
++  !16 = !DILocation(line: 3, column: 55, scope: !7)
++  !17 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 4, type: !8, isLocal: false, isDefinition: true, scopeLine: 4, flags: DIFlagPrototyped, isOptimized: true, unit: !0, variables: !18)
++  !18 = !{!19}
++  !19 = !DILocalVariable(name: "i", arg: 1, scope: !17, file: !1, line: 4, type: !10)
++  !20 = !DILocation(line: 4, column: 14, scope: !17)
++  !21 = !DILocation(line: 3, column: 41, scope: !7, inlinedAt: !22)
++  !22 = distinct !DILocation(line: 5, column: 3, scope: !17)
++  !23 = !DILocation(line: 3, column: 46, scope: !7, inlinedAt: !22)
++  !24 = !DILocation(line: 6, column: 7, scope: !25)
++  !25 = distinct !DILexicalBlock(scope: !17, file: !1, line: 6, column: 7)
++  !26 = !DILocation(line: 6, column: 7, scope: !17)
++  !27 = !DILocation(line: 3, column: 41, scope: !7, inlinedAt: !28)
++  !28 = distinct !DILocation(line: 7, column: 5, scope: !25)
++  !29 = !DILocation(line: 3, column: 46, scope: !7, inlinedAt: !28)
++  !30 = !DILocation(line: 7, column: 5, scope: !25)
++  !31 = !DILocation(line: 3, column: 41, scope: !7, inlinedAt: !32)
++  !32 = distinct !DILocation(line: 8, column: 3, scope: !17)
++  !33 = !DILocation(line: 3, column: 46, scope: !7, inlinedAt: !32)
++  !34 = !DILocation(line: 9, column: 1, scope: !17)
++
++...
++---
++name:            f
++alignment:       4
++exposesReturnsTwice: false
++legalized:       false
++regBankSelected: false
++selected:        false
++tracksRegLiveness: true
++liveins:         
++  - { reg: '%edi' }
++calleeSavedRegisters: [ '%bh', '%bl', '%bp', '%bpl', '%bx', '%ebp', '%ebx', 
++                        '%rbp', '%rbx', '%r12', '%r13', '%r14', '%r15', 
++                        '%r12b', '%r13b', '%r14b', '%r15b', '%r12d', '%r13d', 
++                        '%r14d', '%r15d', '%r12w', '%r13w', '%r14w', '%r15w' ]
++frameInfo:       
++  isFrameAddressTaken: false
++  isReturnAddressTaken: false
++  hasStackMap:     false
++  hasPatchPoint:   false
++  stackSize:       8
++  offsetAdjustment: 0
++  maxAlignment:    0
++  adjustsStack:    false
++  hasCalls:        false
++  maxCallFrameSize: 0
++  hasOpaqueSPAdjustment: false
++  hasVAStart:      false
++  hasMustTailInVarArgFunc: false
++fixedStack:      
++  - { id: 0, type: spill-slot, offset: -16, size: 8, alignment: 16 }
++body:             |
++  bb.0.entry:
++    liveins: %edi, %rbp
++  
++    frame-setup PUSH64r killed %rbp, implicit-def %rsp, implicit %rsp
++    CFI_INSTRUCTION def_cfa_offset 16
++    CFI_INSTRUCTION offset %rbp, -16
++    %rbp = frame-setup MOV64rr %rsp
++    CFI_INSTRUCTION def_cfa_register %rbp
++    DBG_VALUE debug-use %edi, debug-use _, !12, !13, debug-location !14
++    %rbp = POP64r implicit-def %rsp, implicit %rsp, debug-location !15
++    TAILJMPd64 @sink, csr_64, implicit %rsp, implicit %rsp, implicit %edi, debug-location !15
++
++...
++---
++name:            foo
++alignment:       4
++exposesReturnsTwice: false
++legalized:       false
++regBankSelected: false
++selected:        false
++tracksRegLiveness: true
++liveins:         
++  - { reg: '%edi' }
++calleeSavedRegisters: [ '%bh', '%bl', '%bp', '%bpl', '%bx', '%ebp', '%ebx', 
++                        '%rbp', '%rbx', '%r12', '%r13', '%r14', '%r15', 
++                        '%r12b', '%r13b', '%r14b', '%r15b', '%r12d', '%r13d', 
++                        '%r14d', '%r15d', '%r12w', '%r13w', '%r14w', '%r15w' ]
++frameInfo:       
++  isFrameAddressTaken: false
++  isReturnAddressTaken: false
++  hasStackMap:     false
++  hasPatchPoint:   false
++  stackSize:       24
++  offsetAdjustment: -8
++  maxAlignment:    0
++  adjustsStack:    true
++  hasCalls:        true
++  maxCallFrameSize: 0
++  hasOpaqueSPAdjustment: false
++  hasVAStart:      false
++  hasMustTailInVarArgFunc: false
++fixedStack:      
++  - { id: 0, type: spill-slot, offset: -24, size: 8, alignment: 8, callee-saved-register: '%rbx' }
++  - { id: 1, type: spill-slot, offset: -16, size: 8, alignment: 16 }
++body:             |
++  bb.0.entry:
++    successors: %bb.2.if.end, %bb.1.if.then
++    liveins: %edi, %rbx, %rbp
++  
++    frame-setup PUSH64r killed %rbp, implicit-def %rsp, implicit %rsp
++    CFI_INSTRUCTION def_cfa_offset 16
++    CFI_INSTRUCTION offset %rbp, -16
++    %rbp = frame-setup MOV64rr %rsp
++    CFI_INSTRUCTION def_cfa_register %rbp
++    frame-setup PUSH64r killed %rbx, implicit-def %rsp, implicit %rsp
++    frame-setup PUSH64r undef %rax, implicit-def %rsp, implicit %rsp
++    CFI_INSTRUCTION offset %rbx, -24
++    DBG_VALUE debug-use %edi, debug-use _, !19, !13, debug-location !20
++    %ebx = MOV32rr %edi
++    DBG_VALUE debug-use %ebx, debug-use _, !12, !13, debug-location !21
++    DBG_VALUE debug-use %ebx, debug-use _, !19, !13, debug-location !20
++    CALL64pcrel32 @sink, csr_64, implicit %rsp, implicit %edi, implicit-def %rsp, debug-location !23
++    TEST32rr %ebx, %ebx, implicit-def %eflags, debug-location !24
++    JE_1 %bb.2.if.end, implicit %eflags
++  
++  bb.1.if.then:
++    successors: %bb.2.if.end
++    liveins: %ebx, %rbp
++  
++    DBG_VALUE debug-use %ebx, debug-use _, !19, !13, debug-location !20
++    DBG_VALUE debug-use %ebx, debug-use _, !12, !13, debug-location !27
++    %edi = MOV32rr %ebx, debug-location !29
++    CALL64pcrel32 @sink, csr_64, implicit %rsp, implicit %edi, implicit-def %rsp, debug-location !29
++  
++  bb.2.if.end:
++    liveins: %ebx, %rbp
++  
++    DBG_VALUE debug-use %ebx, debug-use _, !19, !13, debug-location !20
++    %edi = MOV32rr killed %ebx, debug-location !33
++    %rsp = ADD64ri8 %rsp, 8, implicit-def dead %eflags, debug-location !33
++    DBG_VALUE debug-use %ebx, debug-use _, !12, !13, debug-location !31
++    %rbx = POP64r implicit-def %rsp, implicit %rsp, debug-location !33
++    %rbp = POP64r implicit-def %rsp, implicit %rsp, debug-location !33
++    TAILJMPd64 @sink, csr_64, implicit %rsp, implicit %rsp, implicit %edi, debug-location !33
++
++...
+diff --git a/test/DebugInfo/X86/fission-ranges.ll b/test/DebugInfo/X86/fission-ranges.ll
+index 3c05f223ee79..0dfb13ab66b7 100644
+--- a/test/DebugInfo/X86/fission-ranges.ll
++++ b/test/DebugInfo/X86/fission-ranges.ll
+@@ -32,13 +32,13 @@
+ ; CHECK-NEXT:                    Length: 25
+ ; CHECK-NEXT:      Location description: 50 93 04
+ ; CHECK: [[E]]: Beginning address index: 4
+-; CHECK-NEXT:                    Length: 23
++; CHECK-NEXT:                    Length: 19
+ ; CHECK-NEXT:      Location description: 50 93 04
+ ; CHECK: [[B]]: Beginning address index: 5
+-; CHECK-NEXT:                    Length: 21
++; CHECK-NEXT:                    Length: 17
+ ; CHECK-NEXT:      Location description: 50 93 04
+ ; CHECK: [[D]]: Beginning address index: 6
+-; CHECK-NEXT:                    Length: 21
++; CHECK-NEXT:                    Length: 17
+ ; CHECK-NEXT:      Location description: 50 93 04
+ 
+ ; Make sure we don't produce any relocations in any .dwo section (though in particular, debug_info.dwo)
+-- 
+2.7.4
+

rust-lang-llvm-pr54.patch

@@ -0,0 +1,103 @@
+From 9b74379db3f9e30516f053138fd3697d42b23164 Mon Sep 17 00:00:00 2001
+From: David Majnemer <david.majnemer@gmail.com>
+Date: Fri, 7 Oct 2016 01:38:35 +0000
+Subject: [rust-lang/llvm#54] [SimplifyCFG] Correctly test for unconditional
+ branches in GetCaseResults
+
+GetCaseResults assumed that a terminator with one successor was an
+unconditional branch.  This is not necessarily the case, it could be a
+cleanupret.
+
+Strengthen the check by querying whether or not the terminator is
+exceptional.
+
+git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@283517 91177308-0d34-0410-b5e6-96231b3b80d8
+---
+ lib/Transforms/Utils/SimplifyCFG.cpp               |  2 +-
+ .../SimplifyCFG/X86/switch_to_lookup_table.ll      | 60 ++++++++++++++++++++++
+ 2 files changed, 61 insertions(+), 1 deletion(-)
+
+diff --git a/lib/Transforms/Utils/SimplifyCFG.cpp b/lib/Transforms/Utils/SimplifyCFG.cpp
+index c197317ac771..d274f97296dc 100644
+--- a/lib/Transforms/Utils/SimplifyCFG.cpp
++++ b/lib/Transforms/Utils/SimplifyCFG.cpp
+@@ -4228,7 +4228,7 @@ GetCaseResults(SwitchInst *SI, ConstantInt *CaseVal, BasicBlock *CaseDest,
+        ++I) {
+     if (TerminatorInst *T = dyn_cast<TerminatorInst>(I)) {
+       // If the terminator is a simple branch, continue to the next block.
+-      if (T->getNumSuccessors() != 1)
++      if (T->getNumSuccessors() != 1 || T->isExceptional())
+         return false;
+       Pred = CaseDest;
+       CaseDest = T->getSuccessor(0);
+diff --git a/test/Transforms/SimplifyCFG/X86/switch_to_lookup_table.ll b/test/Transforms/SimplifyCFG/X86/switch_to_lookup_table.ll
+index bae8c1dc5a4b..77e355a00528 100644
+--- a/test/Transforms/SimplifyCFG/X86/switch_to_lookup_table.ll
++++ b/test/Transforms/SimplifyCFG/X86/switch_to_lookup_table.ll
+@@ -1334,3 +1334,63 @@ cleanup4:
+   br label %while.body
+ }
+ 
++declare void @throw(i1)
++
++define void @wineh_test(i64 %val) personality i32 (...)* @__CxxFrameHandler3 {
++entry:
++  invoke void @throw(i1 false)
++          to label %unreachable unwind label %cleanup1
++
++unreachable:
++  unreachable
++
++cleanup1:
++  %cleanuppad1 = cleanuppad within none []
++  switch i64 %val, label %cleanupdone2 [
++    i64 0, label %cleanupdone1
++    i64 1, label %cleanupdone1
++    i64 6, label %cleanupdone1
++  ]
++
++cleanupdone1:
++  cleanupret from %cleanuppad1 unwind label %cleanup2
++
++cleanupdone2:
++  cleanupret from %cleanuppad1 unwind label %cleanup2
++
++cleanup2:
++  %phi = phi i1 [ true, %cleanupdone1 ], [ false, %cleanupdone2 ]
++  %cleanuppad2 = cleanuppad within none []
++  call void @throw(i1 %phi) [ "funclet"(token %cleanuppad2) ]
++  unreachable
++}
++
++; CHECK-LABEL: @wineh_test(
++; CHECK: entry:
++; CHECK:   invoke void @throw(i1 false)
++; CHECK:           to label %[[unreachable:.*]] unwind label %[[cleanup1:.*]]
++
++; CHECK: [[unreachable]]:
++; CHECK:   unreachable
++
++; CHECK: [[cleanup1]]:
++; CHECK:   %[[cleanuppad1:.*]] = cleanuppad within none []
++; CHECK:   switch i64 %val, label %[[cleanupdone2:.*]] [
++; CHECK:     i64 0, label %[[cleanupdone1:.*]]
++; CHECK:     i64 1, label %[[cleanupdone1]]
++; CHECK:     i64 6, label %[[cleanupdone1]]
++; CHECK:   ]
++
++; CHECK: [[cleanupdone1]]:
++; CHECK:   cleanupret from %[[cleanuppad1]] unwind label %[[cleanup2:.*]]
++
++; CHECK: [[cleanupdone2]]:
++; CHECK:   cleanupret from %[[cleanuppad1]] unwind label %[[cleanup2]]
++
++; CHECK: [[cleanup2]]:
++; CHECK:   %[[phi:.*]] = phi i1 [ true, %[[cleanupdone1]] ], [ false, %[[cleanupdone2]] ]
++; CHECK:   %[[cleanuppad2:.*]] = cleanuppad within none []
++; CHECK:   call void @throw(i1 %[[phi]]) [ "funclet"(token %[[cleanuppad2]]) ]
++; CHECK:   unreachable
++
++declare i32 @__CxxFrameHandler3(...)
+-- 
+2.7.4
+