; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
; RUN: opt < %s -passes=loop-interchange -verify-dom-info -verify-loop-info -S 2>&1 | FileCheck %s

target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"

@D = common global [100 x [100 x [100 x i32]]] zeroinitializer

; Test for interchange in loop nest greater than 2.
;  for(int i=0;i<100;i++)
;    for(int j=0;j<100;j++)
;      for(int k=0;k<100;k++)
;        D[k][j][i] = D[k][j][i]+t;
;
; Loops InnerLoopId = 2 and OuterLoopId = 1 should be interchanged, and then
; also InnerLoopId = 1 and OuterLoopId = 0.
;
define void @interchange_08(i32 %t){
; CHECK-LABEL: define void @interchange_08(
; CHECK-SAME: i32 [[T:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*:]]
; CHECK-NEXT:    br label %[[FOR_BODY6_PREHEADER:.*]]
; CHECK:       [[FOR_COND1_PREHEADER_PREHEADER:.*]]:
; CHECK-NEXT:    br label %[[FOR_COND1_PREHEADER:.*]]
; CHECK:       [[FOR_COND1_PREHEADER]]:
; CHECK-NEXT:    [[I_028:%.*]] = phi i64 [ [[INC16:%.*]], %[[FOR_INC15:.*]] ], [ 0, %[[FOR_COND1_PREHEADER_PREHEADER]] ]
; CHECK-NEXT:    br label %[[FOR_BODY6_SPLIT1:.*]]
; CHECK:       [[FOR_COND4_PREHEADER_PREHEADER:.*]]:
; CHECK-NEXT:    br label %[[FOR_COND4_PREHEADER:.*]]
; CHECK:       [[FOR_COND4_PREHEADER]]:
; CHECK-NEXT:    [[J_027:%.*]] = phi i64 [ [[TMP3:%.*]], %[[FOR_INC12_SPLIT:.*]] ], [ 0, %[[FOR_COND4_PREHEADER_PREHEADER]] ]
; CHECK-NEXT:    br label %[[FOR_COND1_PREHEADER_PREHEADER]]
; CHECK:       [[FOR_BODY6_PREHEADER]]:
; CHECK-NEXT:    br label %[[FOR_BODY6:.*]]
; CHECK:       [[FOR_BODY6]]:
; CHECK-NEXT:    [[K_026:%.*]] = phi i64 [ [[TMP1:%.*]], %[[FOR_BODY6_SPLIT:.*]] ], [ 0, %[[FOR_BODY6_PREHEADER]] ]
; CHECK-NEXT:    br label %[[FOR_COND4_PREHEADER_PREHEADER]]
; CHECK:       [[FOR_BODY6_SPLIT1]]:
; CHECK-NEXT:    [[ARRAYIDX8:%.*]] = getelementptr inbounds [100 x [100 x [100 x i32]]], ptr @D, i64 0, i64 [[K_026]], i64 [[J_027]], i64 [[I_028]]
; CHECK-NEXT:    [[TMP0:%.*]] = load i32, ptr [[ARRAYIDX8]], align 4
; CHECK-NEXT:    [[ADD:%.*]] = add nsw i32 [[TMP0]], [[T]]
; CHECK-NEXT:    store i32 [[ADD]], ptr [[ARRAYIDX8]], align 4
; CHECK-NEXT:    [[INC:%.*]] = add nuw nsw i64 [[K_026]], 1
; CHECK-NEXT:    [[EXITCOND:%.*]] = icmp eq i64 [[INC]], 100
; CHECK-NEXT:    br label %[[FOR_INC12:.*]]
; CHECK:       [[FOR_BODY6_SPLIT]]:
; CHECK-NEXT:    [[TMP1]] = add nuw nsw i64 [[K_026]], 1
; CHECK-NEXT:    [[TMP2:%.*]] = icmp eq i64 [[TMP1]], 100
; CHECK-NEXT:    br i1 [[TMP2]], label %[[FOR_END17:.*]], label %[[FOR_BODY6]]
; CHECK:       [[FOR_INC12]]:
; CHECK-NEXT:    [[INC13:%.*]] = add nuw nsw i64 [[J_027]], 1
; CHECK-NEXT:    [[EXITCOND29:%.*]] = icmp eq i64 [[INC13]], 100
; CHECK-NEXT:    br label %[[FOR_INC15]]
; CHECK:       [[FOR_INC12_SPLIT]]:
; CHECK-NEXT:    [[TMP3]] = add nuw nsw i64 [[J_027]], 1
; CHECK-NEXT:    [[TMP4:%.*]] = icmp eq i64 [[TMP3]], 100
; CHECK-NEXT:    br i1 [[TMP4]], label %[[FOR_BODY6_SPLIT]], label %[[FOR_COND4_PREHEADER]]
; CHECK:       [[FOR_INC15]]:
; CHECK-NEXT:    [[INC16]] = add nuw nsw i64 [[I_028]], 1
; CHECK-NEXT:    [[EXITCOND30:%.*]] = icmp eq i64 [[INC16]], 100
; CHECK-NEXT:    br i1 [[EXITCOND30]], label %[[FOR_INC12_SPLIT]], label %[[FOR_COND1_PREHEADER]]
; CHECK:       [[FOR_END17]]:
; CHECK-NEXT:    ret void
;
entry:
  br label %for.cond1.preheader

for.cond1.preheader:                              ; preds = %for.inc15, %entry
  %i.028 = phi i64 [ 0, %entry ], [ %inc16, %for.inc15 ]
  br label %for.cond4.preheader

for.cond4.preheader:                              ; preds = %for.inc12, %for.cond1.preheader
  %j.027 = phi i64 [ 0, %for.cond1.preheader ], [ %inc13, %for.inc12 ]
  br label %for.body6

for.body6:                                        ; preds = %for.body6, %for.cond4.preheader
  %k.026 = phi i64 [ 0, %for.cond4.preheader ], [ %inc, %for.body6 ]
  %arrayidx8 = getelementptr inbounds [100 x [100 x [100 x i32]]], ptr @D, i64 0, i64 %k.026, i64 %j.027, i64 %i.028
  %0 = load i32, ptr %arrayidx8
  %add = add nsw i32 %0, %t
  store i32 %add, ptr %arrayidx8
  %inc = add nuw nsw i64 %k.026, 1
  %exitcond = icmp eq i64 %inc, 100
  br i1 %exitcond, label %for.inc12, label %for.body6

for.inc12:                                        ; preds = %for.body6
  %inc13 = add nuw nsw i64 %j.027, 1
  %exitcond29 = icmp eq i64 %inc13, 100
  br i1 %exitcond29, label %for.inc15, label %for.cond4.preheader

for.inc15:                                        ; preds = %for.inc12
  %inc16 = add nuw nsw i64 %i.028, 1
  %exitcond30 = icmp eq i64 %inc16, 100
  br i1 %exitcond30, label %for.end17, label %for.cond1.preheader

for.end17:                                        ; preds = %for.inc15
  ret void
}