Index: llvm/include/llvm/Analysis/TargetTransformInfo.h
===================================================================
--- llvm/include/llvm/Analysis/TargetTransformInfo.h
+++ llvm/include/llvm/Analysis/TargetTransformInfo.h
@@ -490,6 +490,8 @@
     bool UpperBound;
     /// Allow peeling off loop iterations.
     bool AllowPeeling;
+    /// Allow peeling off loop iterations for loop nests.
+    bool AllowLoopNestsPeeling;
     /// Allow unrolling of all the iterations of the runtime loop remainder.
     bool UnrollRemainder;
     /// Allow unroll and jam. Used to enable unroll and jam for the target.
Index: llvm/lib/Transforms/Scalar/LoopUnrollPass.cpp
===================================================================
--- llvm/lib/Transforms/Scalar/LoopUnrollPass.cpp
+++ llvm/lib/Transforms/Scalar/LoopUnrollPass.cpp
@@ -154,6 +154,10 @@
                        cl::desc("Allows loops to be peeled when the dynamic "
                                 "trip count is known to be low."));
 
+static cl::opt<bool> UnrollAllowLoopNestsPeeling(
+    "unroll-allow-loop-nests-peeling", cl::init(false), cl::Hidden,
+    cl::desc("Allows loop nests to be peeled."));
+
 static cl::opt<bool> UnrollUnrollRemainder(
   "unroll-remainder", cl::Hidden,
   cl::desc("Allow the loop remainder to be unrolled."));
@@ -204,6 +208,7 @@
   UP.Force = false;
   UP.UpperBound = false;
   UP.AllowPeeling = true;
+  UP.AllowLoopNestsPeeling = false;
   UP.UnrollAndJam = false;
   UP.PeelProfiledIterations = true;
   UP.UnrollAndJamInnerLoopThreshold = 60;
@@ -243,6 +248,8 @@
     UP.UpperBound = false;
   if (UnrollAllowPeeling.getNumOccurrences() > 0)
     UP.AllowPeeling = UnrollAllowPeeling;
+  if (UnrollAllowLoopNestsPeeling.getNumOccurrences() > 0)
+    UP.AllowLoopNestsPeeling = UnrollAllowLoopNestsPeeling;
   if (UnrollUnrollRemainder.getNumOccurrences() > 0)
     UP.UnrollRemainder = UnrollUnrollRemainder;
 
Index: llvm/lib/Transforms/Utils/LoopUnrollPeel.cpp
===================================================================
--- llvm/lib/Transforms/Utils/LoopUnrollPeel.cpp
+++ llvm/lib/Transforms/Utils/LoopUnrollPeel.cpp
@@ -290,7 +290,7 @@
     return;
 
   // Only try to peel innermost loops.
-  if (!L->empty())
+  if (!UP.AllowLoopNestsPeeling && !L->empty())
     return;
 
   // If the user provided a peel count, use that.
Index: llvm/test/Transforms/LoopUnroll/peel-loop-conditions.ll
===================================================================
--- llvm/test/Transforms/LoopUnroll/peel-loop-conditions.ll
+++ llvm/test/Transforms/LoopUnroll/peel-loop-conditions.ll
@@ -1,5 +1,6 @@
 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
 ; RUN: opt < %s -S -loop-unroll -unroll-peel-max-count=4 -verify-dom-info | FileCheck %s
+; RUN: opt < %s -S -loop-unroll -unroll-peel-max-count=4 -unroll-allow-loop-nests-peeling -verify-dom-info | FileCheck %s --check-prefix LOOP-NEST
 
 declare void @f1()
 declare void @f2()
@@ -433,6 +434,88 @@
 ; CHECK:       for.end:
 ; CHECK-NEXT:    ret void
 ;
+; LOOP-NEST-LABEL: @test5(
+; LOOP-NEST-NEXT:  for.body.lr.ph:
+; LOOP-NEST-NEXT:    br label [[OUTER_HEADER_PEEL_BEGIN:%.*]]
+; LOOP-NEST:       outer.header.peel.begin:
+; LOOP-NEST-NEXT:    br label [[OUTER_HEADER_PEEL:%.*]]
+; LOOP-NEST:       outer.header.peel:
+; LOOP-NEST-NEXT:    br label [[FOR_BODY_PEEL:%.*]]
+; LOOP-NEST:       for.body.peel:
+; LOOP-NEST-NEXT:    [[I_05_PEEL:%.*]] = phi i32 [ 0, [[OUTER_HEADER_PEEL]] ], [ [[INC_PEEL:%.*]], [[FOR_INC_PEEL:%.*]] ]
+; LOOP-NEST-NEXT:    [[CMP1_PEEL:%.*]] = icmp ult i32 0, 2
+; LOOP-NEST-NEXT:    br i1 [[CMP1_PEEL]], label [[IF_THEN_PEEL:%.*]], label [[IF_ELSE_PEEL:%.*]]
+; LOOP-NEST:       if.else.peel:
+; LOOP-NEST-NEXT:    call void @f2()
+; LOOP-NEST-NEXT:    br label [[FOR_INC_PEEL]]
+; LOOP-NEST:       if.then.peel:
+; LOOP-NEST-NEXT:    call void @f1()
+; LOOP-NEST-NEXT:    br label [[FOR_INC_PEEL]]
+; LOOP-NEST:       for.inc.peel:
+; LOOP-NEST-NEXT:    [[INC_PEEL]] = add nsw i32 [[I_05_PEEL]], 1
+; LOOP-NEST-NEXT:    [[CMP_PEEL:%.*]] = icmp slt i32 [[INC_PEEL]], [[K:%.*]]
+; LOOP-NEST-NEXT:    br i1 [[CMP_PEEL]], label [[FOR_BODY_PEEL]], label [[OUTER_INC_PEEL:%.*]]
+; LOOP-NEST:       outer.inc.peel:
+; LOOP-NEST-NEXT:    [[J_INC_PEEL:%.*]] = add nsw i32 0, 1
+; LOOP-NEST-NEXT:    [[OUTER_CMP_PEEL:%.*]] = icmp slt i32 [[J_INC_PEEL]], [[K]]
+; LOOP-NEST-NEXT:    br i1 [[OUTER_CMP_PEEL]], label [[OUTER_HEADER_PEEL_NEXT:%.*]], label [[FOR_END:%[^,]*]]
+; Verify that MD_loop metadata is dropped.
+; LOOP-NEST-NOT:   , !llvm.loop !{{[0-9]*}}
+; LOOP-NEST:       outer.header.peel.next:
+; LOOP-NEST-NEXT:    br label [[OUTER_HEADER_PEEL2:%.*]]
+; LOOP-NEST:       outer.header.peel2:
+; LOOP-NEST-NEXT:    br label [[FOR_BODY_PEEL3:%.*]]
+; LOOP-NEST:       for.body.peel3:
+; LOOP-NEST-NEXT:    [[I_05_PEEL4:%.*]] = phi i32 [ 0, [[OUTER_HEADER_PEEL2]] ], [ [[INC_PEEL9:%.*]], [[FOR_INC_PEEL8:%.*]] ]
+; LOOP-NEST-NEXT:    [[CMP1_PEEL5:%.*]] = icmp ult i32 [[J_INC_PEEL]], 2
+; LOOP-NEST-NEXT:    br i1 [[CMP1_PEEL5]], label [[IF_THEN_PEEL7:%.*]], label [[IF_ELSE_PEEL6:%.*]]
+; LOOP-NEST:       if.else.peel6:
+; LOOP-NEST-NEXT:    call void @f2()
+; LOOP-NEST-NEXT:    br label [[FOR_INC_PEEL8]]
+; LOOP-NEST:       if.then.peel7:
+; LOOP-NEST-NEXT:    call void @f1()
+; LOOP-NEST-NEXT:    br label [[FOR_INC_PEEL8]]
+; LOOP-NEST:       for.inc.peel8:
+; LOOP-NEST-NEXT:    [[INC_PEEL9]] = add nsw i32 [[I_05_PEEL4]], 1
+; LOOP-NEST-NEXT:    [[CMP_PEEL10:%.*]] = icmp slt i32 [[INC_PEEL9]], [[K]]
+; LOOP-NEST-NEXT:    br i1 [[CMP_PEEL10]], label [[FOR_BODY_PEEL3]], label [[OUTER_INC_PEEL11:%.*]]
+; LOOP-NEST:       outer.inc.peel11:
+; LOOP-NEST-NEXT:    [[J_INC_PEEL12:%.*]] = add nsw i32 [[J_INC_PEEL]], 1
+; LOOP-NEST-NEXT:    [[OUTER_CMP_PEEL13:%.*]] = icmp slt i32 [[J_INC_PEEL12]], [[K]]
+; LOOP-NEST-NEXT:    br i1 [[OUTER_CMP_PEEL13]], label [[OUTER_HEADER_PEEL_NEXT1:%.*]], label [[FOR_END]]
+; Verify that MD_loop metadata is dropped.
+; LOOP-NEST-NOT:   , !llvm.loop !{{[0-9]*}}
+; LOOP-NEST:       outer.header.peel.next1:
+; LOOP-NEST-NEXT:    br label [[OUTER_HEADER_PEEL_NEXT14:%.*]]
+; LOOP-NEST:       outer.header.peel.next14:
+; LOOP-NEST-NEXT:    br label [[FOR_BODY_LR_PH_PEEL_NEWPH:%.*]]
+; LOOP-NEST:       for.body.lr.ph.peel.newph:
+; LOOP-NEST-NEXT:    br label [[OUTER_HEADER:%.*]]
+; LOOP-NEST:       outer.header:
+; LOOP-NEST-NEXT:    [[J:%.*]] = phi i32 [ [[J_INC_PEEL12]], [[FOR_BODY_LR_PH_PEEL_NEWPH]] ], [ [[J_INC:%.*]], [[OUTER_INC:%.*]] ]
+; LOOP-NEST-NEXT:    br label [[FOR_BODY:%.*]]
+; LOOP-NEST:       for.body:
+; LOOP-NEST-NEXT:    [[I_05:%.*]] = phi i32 [ 0, [[OUTER_HEADER]] ], [ [[INC:%.*]], [[FOR_INC:%.*]] ]
+; LOOP-NEST-NEXT:    br i1 false, label [[IF_THEN:%.*]], label [[IF_ELSE:%.*]]
+; LOOP-NEST:       if.then:
+; LOOP-NEST-NEXT:    call void @f1()
+; LOOP-NEST-NEXT:    br label [[FOR_INC]]
+; LOOP-NEST:       if.else:
+; LOOP-NEST-NEXT:    call void @f2()
+; LOOP-NEST-NEXT:    br label [[FOR_INC]]
+; LOOP-NEST:       for.inc:
+; LOOP-NEST-NEXT:    [[INC]] = add nsw i32 [[I_05]], 1
+; LOOP-NEST-NEXT:    [[CMP:%.*]] = icmp slt i32 [[INC]], [[K]]
+; LOOP-NEST-NEXT:    br i1 [[CMP]], label [[FOR_BODY]], label [[OUTER_INC]]
+; LOOP-NEST:       outer.inc:
+; LOOP-NEST-NEXT:    [[J_INC]] = add nuw nsw i32 [[J]], 1
+; LOOP-NEST-NEXT:    [[OUTER_CMP:%.*]] = icmp slt i32 [[J_INC]], [[K]]
+; LOOP-NEST-NEXT:    br i1 [[OUTER_CMP]], label [[OUTER_HEADER]], label [[FOR_END_LOOPEXIT:%.*]], !llvm.loop !{{.*}}
+; LOOP-NEST:       for.end.loopexit:
+; LOOP-NEST-NEXT:    br label [[FOR_END]]
+; LOOP-NEST:       for.end:
+; LOOP-NEST-NEXT:    ret void
+;
 for.body.lr.ph:
   br label %outer.header