1; RUN: opt < %s -basicaa -loop-interchange -S | FileCheck %s
2;; We test the complete .ll for adjustment in outer loop header/latch and inner loop header/latch.
3
4target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
5target triple = "x86_64-unknown-linux-gnu"
6
7@A = common global [100 x [100 x i32]] zeroinitializer
8@B = common global [100 x i32] zeroinitializer
9@C = common global [100 x [100 x i32]] zeroinitializer
10@D = common global [100 x [100 x [100 x i32]]] zeroinitializer
11
12declare void @foo(...)
13
14;;--------------------------------------Test case 01------------------------------------
15;;  for(int i=0;i<N;i++)
16;;    for(int j=1;j<N;j++)
17;;      A[j][i] = A[j][i]+k;
18
19define void @interchange_01(i32 %k, i32 %N) {
20entry:
21  %cmp21 = icmp sgt i32 %N, 0
22  br i1 %cmp21, label %for.cond1.preheader.lr.ph, label %for.end12
23
24for.cond1.preheader.lr.ph:
25  %cmp219 = icmp sgt i32 %N, 1
26  %0 = add i32 %N, -1
27  br label %for.cond1.preheader
28
29for.cond1.preheader:
30  %indvars.iv23 = phi i64 [ 0, %for.cond1.preheader.lr.ph ], [ %indvars.iv.next24, %for.inc10 ]
31  br i1 %cmp219, label %for.body3, label %for.inc10
32
33for.body3:
34  %indvars.iv = phi i64 [ %indvars.iv.next, %for.body3 ], [ 1, %for.cond1.preheader ]
35  %arrayidx5 = getelementptr inbounds [100 x [100 x i32]], [100 x [100 x i32]]* @A, i64 0, i64 %indvars.iv, i64 %indvars.iv23
36  %1 = load i32, i32* %arrayidx5
37  %add = add nsw i32 %1, %k
38  store i32 %add, i32* %arrayidx5
39  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
40  %lftr.wideiv = trunc i64 %indvars.iv to i32
41  %exitcond = icmp eq i32 %lftr.wideiv, %0
42  br i1 %exitcond, label %for.inc10, label %for.body3
43
44for.inc10:
45  %indvars.iv.next24 = add nuw nsw i64 %indvars.iv23, 1
46  %lftr.wideiv25 = trunc i64 %indvars.iv23 to i32
47  %exitcond26 = icmp eq i32 %lftr.wideiv25, %0
48  br i1 %exitcond26, label %for.end12, label %for.cond1.preheader
49
50for.end12:
51  ret void
52}
53
54; CHECK-LABEL: @interchange_01
55; CHECK: entry:
56; CHECK:   %cmp21 = icmp sgt i32 %N, 0
57; CHECK:   br i1 %cmp21, label %for.body3.preheader, label %for.end12
58; CHECK: for.cond1.preheader.lr.ph:
59; CHECK:   br label %for.cond1.preheader
60; CHECK: for.cond1.preheader:
61; CHECK:   %indvars.iv23 = phi i64 [ 0, %for.cond1.preheader.lr.ph ], [ %indvars.iv.next24, %for.inc10 ]
62; CHECK:   br i1 %cmp219, label %for.body3.split1, label %for.end12.loopexit
63; CHECK: for.body3.preheader:
64; CHECK:   %cmp219 = icmp sgt i32 %N, 1
65; CHECK:   %0 = add i32 %N, -1
66; CHECK:   br label %for.body3
67; CHECK: for.body3:
68; CHECK:   %indvars.iv = phi i64 [ %indvars.iv.next, %for.body3.split ], [ 1, %for.body3.preheader ]
69; CHECK:   br label %for.cond1.preheader.lr.ph
70; CHECK: for.body3.split1:
71; CHECK:   %arrayidx5 = getelementptr inbounds [100 x [100 x i32]], [100 x [100 x i32]]* @A, i64 0, i64 %indvars.iv, i64 %indvars.iv23
72; CHECK:   %1 = load i32, i32* %arrayidx5
73; CHECK:   %add = add nsw i32 %1, %k
74; CHECK:   store i32 %add, i32* %arrayidx5
75; CHECK:   br label %for.inc10.loopexit
76; CHECK: for.body3.split:
77; CHECK:   %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
78; CHECK:   %lftr.wideiv = trunc i64 %indvars.iv to i32
79; CHECK:   %exitcond = icmp eq i32 %lftr.wideiv, %0
80; CHECK:   br i1 %exitcond, label %for.end12.loopexit, label %for.body3
81; CHECK: for.inc10.loopexit:
82; CHECK:   br label %for.inc10
83; CHECK: for.inc10:
84; CHECK:   %indvars.iv.next24 = add nuw nsw i64 %indvars.iv23, 1
85; CHECK:   %lftr.wideiv25 = trunc i64 %indvars.iv23 to i32
86; CHECK:   %exitcond26 = icmp eq i32 %lftr.wideiv25, %0
87; CHECK:   br i1 %exitcond26, label %for.body3.split, label %for.cond1.preheader
88; CHECK: for.end12.loopexit:
89; CHECK:   br label %for.end12
90; CHECK: for.end12:
91; CHECK:   ret void
92
93;;--------------------------------------Test case 02-------------------------------------
94
95;; for(int i=0;i<100;i++)
96;;   for(int j=100;j>=0;j--)
97;;     A[j][i] = A[j][i]+k;
98
99define void @interchange_02(i32 %k) {
100entry:
101  br label %for.cond1.preheader
102
103for.cond1.preheader:
104  %indvars.iv19 = phi i64 [ 0, %entry ], [ %indvars.iv.next20, %for.inc10 ]
105  br label %for.body3
106
107for.body3:
108  %indvars.iv = phi i64 [ 100, %for.cond1.preheader ], [ %indvars.iv.next, %for.body3 ]
109  %arrayidx5 = getelementptr inbounds [100 x [100 x i32]], [100 x [100 x i32]]* @A, i64 0, i64 %indvars.iv, i64 %indvars.iv19
110  %0 = load i32, i32* %arrayidx5
111  %add = add nsw i32 %0, %k
112  store i32 %add, i32* %arrayidx5
113  %indvars.iv.next = add nsw i64 %indvars.iv, -1
114  %cmp2 = icmp sgt i64 %indvars.iv, 0
115  br i1 %cmp2, label %for.body3, label %for.inc10
116
117for.inc10:
118  %indvars.iv.next20 = add nuw nsw i64 %indvars.iv19, 1
119  %exitcond = icmp eq i64 %indvars.iv.next20, 100
120  br i1 %exitcond, label %for.end11, label %for.cond1.preheader
121
122for.end11:
123  ret void
124}
125
126; CHECK-LABEL: @interchange_02
127; CHECK: entry:
128; CHECK:   br label %for.body3.preheader
129; CHECK: for.cond1.preheader.preheader:
130; CHECK:   br label %for.cond1.preheader
131; CHECK: for.cond1.preheader:
132; CHECK:   %indvars.iv19 = phi i64 [ %indvars.iv.next20, %for.inc10 ], [ 0, %for.cond1.preheader.preheader ]
133; CHECK:   br label %for.body3.split1
134; CHECK: for.body3.preheader:
135; CHECK:   br label %for.body3
136; CHECK: for.body3:
137; CHECK:   %indvars.iv = phi i64 [ %indvars.iv.next, %for.body3.split ], [ 100, %for.body3.preheader ]
138; CHECK:   br label %for.cond1.preheader.preheader
139; CHECK: for.body3.split1:                                 ; preds = %for.cond1.preheader
140; CHECK:   %arrayidx5 = getelementptr inbounds [100 x [100 x i32]], [100 x [100 x i32]]* @A, i64 0, i64 %indvars.iv, i64 %indvars.iv19
141; CHECK:   %0 = load i32, i32* %arrayidx5
142; CHECK:   %add = add nsw i32 %0, %k
143; CHECK:   store i32 %add, i32* %arrayidx5
144; CHECK:   br label %for.inc10
145; CHECK: for.body3.split:
146; CHECK:   %indvars.iv.next = add nsw i64 %indvars.iv, -1
147; CHECK:   %cmp2 = icmp sgt i64 %indvars.iv, 0
148; CHECK:   br i1 %cmp2, label %for.body3, label %for.end11
149; CHECK: for.inc10:
150; CHECK:   %indvars.iv.next20 = add nuw nsw i64 %indvars.iv19, 1
151; CHECK:   %exitcond = icmp eq i64 %indvars.iv.next20, 100
152; CHECK:   br i1 %exitcond, label %for.body3.split, label %for.cond1.preheader
153; CHECK: for.end11:
154; CHECK:   ret void
155
156;;--------------------------------------Test case 03-------------------------------------
157;; Loops should not be interchanged in this case as it is not profitable.
158;;  for(int i=0;i<100;i++)
159;;    for(int j=0;j<100;j++)
160;;      A[i][j] = A[i][j]+k;
161
162define void @interchange_03(i32 %k) {
163entry:
164  br label %for.cond1.preheader
165
166for.cond1.preheader:
167  %indvars.iv21 = phi i64 [ 0, %entry ], [ %indvars.iv.next22, %for.inc10 ]
168  br label %for.body3
169
170for.body3:
171  %indvars.iv = phi i64 [ 0, %for.cond1.preheader ], [ %indvars.iv.next, %for.body3 ]
172  %arrayidx5 = getelementptr inbounds [100 x [100 x i32]], [100 x [100 x i32]]* @A, i64 0, i64 %indvars.iv21, i64 %indvars.iv
173  %0 = load i32, i32* %arrayidx5
174  %add = add nsw i32 %0, %k
175  store i32 %add, i32* %arrayidx5
176  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
177  %exitcond = icmp eq i64 %indvars.iv.next, 100
178  br i1 %exitcond, label %for.inc10, label %for.body3
179
180for.inc10:
181  %indvars.iv.next22 = add nuw nsw i64 %indvars.iv21, 1
182  %exitcond23 = icmp eq i64 %indvars.iv.next22, 100
183  br i1 %exitcond23, label %for.end12, label %for.cond1.preheader
184
185for.end12:
186  ret void
187}
188
189; CHECK-LABEL: @interchange_03
190; CHECK: entry:
191; CHECK:   br label %for.cond1.preheader.preheader
192; CHECK: for.cond1.preheader.preheader:                    ; preds = %entry
193; CHECK:   br label %for.cond1.preheader
194; CHECK: for.cond1.preheader:                              ; preds = %for.cond1.preheader.preheader, %for.inc10
195; CHECK:   %indvars.iv21 = phi i64 [ %indvars.iv.next22, %for.inc10 ], [ 0, %for.cond1.preheader.preheader ]
196; CHECK:  br label %for.body3.preheader
197; CHECK: for.body3.preheader:                              ; preds = %for.cond1.preheader
198; CHECK:   br label %for.body3
199; CHECK: for.body3:                                        ; preds = %for.body3.preheader, %for.body3
200; CHECK:   %indvars.iv = phi i64 [ %indvars.iv.next, %for.body3 ], [ 0, %for.body3.preheader ]
201; CHECK:   %arrayidx5 = getelementptr inbounds [100 x [100 x i32]], [100 x [100 x i32]]* @A, i64 0, i64 %indvars.iv21, i64 %indvars.iv
202; CHECK:   %0 = load i32, i32* %arrayidx5
203; CHECK:   %add = add nsw i32 %0, %k
204; CHECK:   store i32 %add, i32* %arrayidx5
205; CHECK:   %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
206; CHECK:   %exitcond = icmp eq i64 %indvars.iv.next, 100
207; CHECK:   br i1 %exitcond, label %for.inc10, label %for.body3
208; CHECK: for.inc10:                                        ; preds = %for.body3
209; CHECK:   %indvars.iv.next22 = add nuw nsw i64 %indvars.iv21, 1
210; CHECK:   %exitcond23 = icmp eq i64 %indvars.iv.next22, 100
211; CHECK:   br i1 %exitcond23, label %for.end12, label %for.cond1.preheader
212; CHECK: for.end12:                                        ; preds = %for.inc10
213; CHECK:   ret void
214
215
216;;--------------------------------------Test case 04-------------------------------------
217;; Loops should not be interchanged in this case as it is not legal due to dependency.
218;;  for(int j=0;j<99;j++)
219;;   for(int i=0;i<99;i++)
220;;       A[j][i+1] = A[j+1][i]+k;
221
222define void @interchange_04(i32 %k){
223entry:
224  br label %for.cond1.preheader
225
226for.cond1.preheader:
227  %indvars.iv23 = phi i64 [ 0, %entry ], [ %indvars.iv.next24, %for.inc12 ]
228  %indvars.iv.next24 = add nuw nsw i64 %indvars.iv23, 1
229  br label %for.body3
230
231for.body3:
232  %indvars.iv = phi i64 [ 0, %for.cond1.preheader ], [ %indvars.iv.next, %for.body3 ]
233  %arrayidx5 = getelementptr inbounds [100 x [100 x i32]], [100 x [100 x i32]]* @A, i64 0, i64 %indvars.iv.next24, i64 %indvars.iv
234  %0 = load i32, i32* %arrayidx5
235  %add6 = add nsw i32 %0, %k
236  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
237  %arrayidx11 = getelementptr inbounds [100 x [100 x i32]], [100 x [100 x i32]]* @A, i64 0, i64 %indvars.iv23, i64 %indvars.iv.next
238  store i32 %add6, i32* %arrayidx11
239  %exitcond = icmp eq i64 %indvars.iv.next, 99
240  br i1 %exitcond, label %for.inc12, label %for.body3
241
242for.inc12:
243  %exitcond25 = icmp eq i64 %indvars.iv.next24, 99
244  br i1 %exitcond25, label %for.end14, label %for.cond1.preheader
245
246for.end14:
247  ret void
248}
249
250; CHECK-LABEL: @interchange_04
251; CHECK: entry:
252; CHECK:   br label %for.cond1.preheader
253; CHECK: for.cond1.preheader:                              ; preds = %for.inc12, %entry
254; CHECK:   %indvars.iv23 = phi i64 [ 0, %entry ], [ %indvars.iv.next24, %for.inc12 ]
255; CHECK:   %indvars.iv.next24 = add nuw nsw i64 %indvars.iv23, 1
256; CHECK:   br label %for.body3
257; CHECK: for.body3:                                        ; preds = %for.body3, %for.cond1.preheader
258; CHECK:   %indvars.iv = phi i64 [ 0, %for.cond1.preheader ], [ %indvars.iv.next, %for.body3 ]
259; CHECK:   %arrayidx5 = getelementptr inbounds [100 x [100 x i32]], [100 x [100 x i32]]* @A, i64 0, i64 %indvars.iv.next24, i64 %indvars.iv
260; CHECK:   %0 = load i32, i32* %arrayidx5
261; CHECK:   %add6 = add nsw i32 %0, %k
262; CHECK:   %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
263; CHECK:   %arrayidx11 = getelementptr inbounds [100 x [100 x i32]], [100 x [100 x i32]]* @A, i64 0, i64 %indvars.iv23, i64 %indvars.iv.next
264; CHECK:   store i32 %add6, i32* %arrayidx11
265; CHECK:   %exitcond = icmp eq i64 %indvars.iv.next, 99
266; CHECK:   br i1 %exitcond, label %for.inc12, label %for.body3
267; CHECK: for.inc12:                                        ; preds = %for.body3
268; CHECK:   %exitcond25 = icmp eq i64 %indvars.iv.next24, 99
269; CHECK:   br i1 %exitcond25, label %for.end14, label %for.cond1.preheader
270; CHECK: for.end14:                                        ; preds = %for.inc12
271; CHECK:   ret void
272
273
274
275;;--------------------------------------Test case 05-------------------------------------
276;; Loops not tightly nested are not interchanged
277;;  for(int j=0;j<N;j++) {
278;;    B[j] = j+k;
279;;    for(int i=0;i<N;i++)
280;;      A[j][i] = A[j][i]+B[j];
281;;  }
282
283define void @interchange_05(i32 %k, i32 %N){
284entry:
285  %cmp30 = icmp sgt i32 %N, 0
286  br i1 %cmp30, label %for.body.lr.ph, label %for.end17
287
288for.body.lr.ph:
289  %0 = add i32 %N, -1
290  %1 = zext i32 %k to i64
291  br label %for.body
292
293for.body:
294  %indvars.iv32 = phi i64 [ 0, %for.body.lr.ph ], [ %indvars.iv.next33, %for.inc15 ]
295  %2 = add nsw i64 %indvars.iv32, %1
296  %arrayidx = getelementptr inbounds [100 x i32], [100 x i32]* @B, i64 0, i64 %indvars.iv32
297  %3 = trunc i64 %2 to i32
298  store i32 %3, i32* %arrayidx
299  br label %for.body3
300
301for.body3:
302  %indvars.iv = phi i64 [ 0, %for.body ], [ %indvars.iv.next, %for.body3 ]
303  %arrayidx7 = getelementptr inbounds [100 x [100 x i32]], [100 x [100 x i32]]* @A, i64 0, i64 %indvars.iv32, i64 %indvars.iv
304  %4 = load i32, i32* %arrayidx7
305  %add10 = add nsw i32 %3, %4
306  store i32 %add10, i32* %arrayidx7
307  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
308  %lftr.wideiv = trunc i64 %indvars.iv to i32
309  %exitcond = icmp eq i32 %lftr.wideiv, %0
310  br i1 %exitcond, label %for.inc15, label %for.body3
311
312for.inc15:
313  %indvars.iv.next33 = add nuw nsw i64 %indvars.iv32, 1
314  %lftr.wideiv35 = trunc i64 %indvars.iv32 to i32
315  %exitcond36 = icmp eq i32 %lftr.wideiv35, %0
316  br i1 %exitcond36, label %for.end17, label %for.body
317
318for.end17:
319  ret void
320}
321
322; CHECK-LABEL: @interchange_05
323; CHECK: entry:
324; CHECK: %cmp30 = icmp sgt i32 %N, 0
325; CHECK: br i1 %cmp30, label %for.body.lr.ph, label %for.end17
326; CHECK: for.body.lr.ph:
327; CHECK: %0 = add i32 %N, -1
328; CHECK: %1 = zext i32 %k to i64
329; CHECK: br label %for.body
330; CHECK: for.body:
331; CHECK: %indvars.iv32 = phi i64 [ 0, %for.body.lr.ph ], [ %indvars.iv.next33, %for.inc15 ]
332; CHECK: %2 = add nsw i64 %indvars.iv32, %1
333; CHECK: %arrayidx = getelementptr inbounds [100 x i32], [100 x i32]* @B, i64 0, i64 %indvars.iv32
334; CHECK: %3 = trunc i64 %2 to i32
335; CHECK: store i32 %3, i32* %arrayidx
336; CHECK: br label %for.body3.preheader
337; CHECK: for.body3.preheader:
338; CHECK: br label %for.body3
339; CHECK: for.body3:
340; CHECK: %indvars.iv = phi i64 [ %indvars.iv.next, %for.body3 ], [ 0, %for.body3.preheader ]
341; CHECK: %arrayidx7 = getelementptr inbounds [100 x [100 x i32]], [100 x [100 x i32]]* @A, i64 0, i64 %indvars.iv32, i64 %indvars.iv
342; CHECK: %4 = load i32, i32* %arrayidx7
343; CHECK: %add10 = add nsw i32 %3, %4
344; CHECK: store i32 %add10, i32* %arrayidx7
345; CHECK: %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
346; CHECK: %lftr.wideiv = trunc i64 %indvars.iv to i32
347; CHECK: %exitcond = icmp eq i32 %lftr.wideiv, %0
348; CHECK: br i1 %exitcond, label %for.inc15, label %for.body3
349; CHECK: for.inc15:
350; CHECK: %indvars.iv.next33 = add nuw nsw i64 %indvars.iv32, 1
351; CHECK: %lftr.wideiv35 = trunc i64 %indvars.iv32 to i32
352; CHECK: %exitcond36 = icmp eq i32 %lftr.wideiv35, %0
353; CHECK: br i1 %exitcond36, label %for.end17.loopexit, label %for.body
354; CHECK: for.end17.loopexit:
355; CHECK: br label %for.end17
356; CHECK: for.end17:
357; CHECK: ret void
358
359
360;;--------------------------------------Test case 06-------------------------------------
361;; Loops not tightly nested are not interchanged
362;;  for(int j=0;j<N;j++) {
363;;    foo();
364;;    for(int i=2;i<N;i++)
365;;      A[j][i] = A[j][i]+k;
366;;  }
367
368define void @interchange_06(i32 %k, i32 %N) {
369entry:
370  %cmp22 = icmp sgt i32 %N, 0
371  br i1 %cmp22, label %for.body.lr.ph, label %for.end12
372
373for.body.lr.ph:
374  %0 = add i32 %N, -1
375  br label %for.body
376
377for.body:
378  %indvars.iv24 = phi i64 [ 0, %for.body.lr.ph ], [ %indvars.iv.next25, %for.inc10 ]
379  tail call void (...) @foo()
380  br label %for.body3
381
382for.body3:
383  %indvars.iv = phi i64 [ %indvars.iv.next, %for.body3 ], [ 2, %for.body ]
384  %arrayidx5 = getelementptr inbounds [100 x [100 x i32]], [100 x [100 x i32]]* @A, i64 0, i64 %indvars.iv24, i64 %indvars.iv
385  %1 = load i32, i32* %arrayidx5
386  %add = add nsw i32 %1, %k
387  store i32 %add, i32* %arrayidx5
388  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
389  %lftr.wideiv = trunc i64 %indvars.iv to i32
390  %exitcond = icmp eq i32 %lftr.wideiv, %0
391  br i1 %exitcond, label %for.inc10, label %for.body3
392
393for.inc10:
394  %indvars.iv.next25 = add nuw nsw i64 %indvars.iv24, 1
395  %lftr.wideiv26 = trunc i64 %indvars.iv24 to i32
396  %exitcond27 = icmp eq i32 %lftr.wideiv26, %0
397  br i1 %exitcond27, label %for.end12, label %for.body
398
399for.end12:
400  ret void
401}
402;; Here we are checking if the inner phi is not split then we have not interchanged.
403; CHECK-LABEL: @interchange_06
404; CHECK:  phi i64 [ %indvars.iv.next, %for.body3 ], [ 2, %for.body3.preheader ]
405; CHECK-NEXT: getelementptr
406; CHECK-NEXT: %1 = load
407
408;;--------------------------------------Test case 07-------------------------------------
409;; FIXME:
410;; Test for interchange when we have an lcssa phi. This should ideally be interchanged but it is currently not supported.
411;;     for(gi=1;gi<N;gi++)
412;;       for(gj=1;gj<M;gj++)
413;;         A[gj][gi] = A[gj - 1][gi] + C[gj][gi];
414
415@gi = common global i32 0
416@gj = common global i32 0
417
418define void @interchange_07(i32 %N, i32 %M){
419entry:
420  store i32 1, i32* @gi
421  %cmp21 = icmp sgt i32 %N, 1
422  br i1 %cmp21, label %for.cond1.preheader.lr.ph, label %for.end16
423
424for.cond1.preheader.lr.ph:
425  %cmp218 = icmp sgt i32 %M, 1
426  %gi.promoted = load i32, i32* @gi
427  %0 = add i32 %M, -1
428  %1 = sext i32 %gi.promoted to i64
429  %2 = sext i32 %N to i64
430  %3 = add i32 %gi.promoted, 1
431  %4 = icmp slt i32 %3, %N
432  %smax = select i1 %4, i32 %N, i32 %3
433  br label %for.cond1.preheader
434
435for.cond1.preheader:
436  %indvars.iv25 = phi i64 [ %1, %for.cond1.preheader.lr.ph ], [ %indvars.iv.next26, %for.inc14 ]
437  br i1 %cmp218, label %for.body3, label %for.inc14
438
439for.body3:
440  %indvars.iv = phi i64 [ %indvars.iv.next, %for.body3 ], [ 1, %for.cond1.preheader ]
441  %5 = add nsw i64 %indvars.iv, -1
442  %arrayidx5 = getelementptr inbounds [100 x [100 x i32]], [100 x [100 x i32]]* @A, i64 0, i64 %5, i64 %indvars.iv25
443  %6 = load i32, i32* %arrayidx5
444  %arrayidx9 = getelementptr inbounds [100 x [100 x i32]], [100 x [100 x i32]]* @C, i64 0, i64 %indvars.iv, i64 %indvars.iv25
445  %7 = load i32, i32* %arrayidx9
446  %add = add nsw i32 %7, %6
447  %arrayidx13 = getelementptr inbounds [100 x [100 x i32]], [100 x [100 x i32]]* @A, i64 0, i64 %indvars.iv, i64 %indvars.iv25
448  store i32 %add, i32* %arrayidx13
449  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
450  %lftr.wideiv = trunc i64 %indvars.iv to i32
451  %exitcond = icmp eq i32 %lftr.wideiv, %0
452  br i1 %exitcond, label %for.inc14, label %for.body3
453
454for.inc14:
455  %inc.lcssa23 = phi i32 [ 1, %for.cond1.preheader ], [ %M, %for.body3 ]
456  %indvars.iv.next26 = add nsw i64 %indvars.iv25, 1
457  %cmp = icmp slt i64 %indvars.iv.next26, %2
458  br i1 %cmp, label %for.cond1.preheader, label %for.cond.for.end16_crit_edge
459
460for.cond.for.end16_crit_edge:
461  store i32 %inc.lcssa23, i32* @gj
462  store i32 %smax, i32* @gi
463  br label %for.end16
464
465for.end16:
466  ret void
467}
468
469; CHECK-LABEL: @interchange_07
470; CHECK: for.body3:                                        ; preds = %for.body3.preheader, %for.body3
471; CHECK:   %indvars.iv = phi i64 [ %indvars.iv.next, %for.body3 ], [ 1, %for.body3.preheader ]
472; CHECK:   %5 = add nsw i64 %indvars.iv, -1
473; CHECK:   %arrayidx5 = getelementptr inbounds [100 x [100 x i32]], [100 x [100 x i32]]* @A, i64 0, i64 %5, i64 %indvars.iv25
474; CHECK:   %6 = load i32, i32* %arrayidx5
475; CHECK:   %arrayidx9 = getelementptr inbounds [100 x [100 x i32]], [100 x [100 x i32]]* @C, i64 0, i64 %indvars.iv, i64 %indvars.iv25
476
477;;------------------------------------------------Test case 08-------------------------------
478;; Test for interchange in loop nest greater than 2.
479;;  for(int i=0;i<100;i++)
480;;    for(int j=0;j<100;j++)
481;;      for(int k=0;k<100;k++)
482;;        D[i][k][j] = D[i][k][j]+t;
483
484define void @interchange_08(i32 %t){
485entry:
486  br label %for.cond1.preheader
487
488for.cond1.preheader:                              ; preds = %for.inc15, %entry
489  %i.028 = phi i32 [ 0, %entry ], [ %inc16, %for.inc15 ]
490  br label %for.cond4.preheader
491
492for.cond4.preheader:                              ; preds = %for.inc12, %for.cond1.preheader
493  %j.027 = phi i32 [ 0, %for.cond1.preheader ], [ %inc13, %for.inc12 ]
494  br label %for.body6
495
496for.body6:                                        ; preds = %for.body6, %for.cond4.preheader
497  %k.026 = phi i32 [ 0, %for.cond4.preheader ], [ %inc, %for.body6 ]
498  %arrayidx8 = getelementptr inbounds [100 x [100 x [100 x i32]]], [100 x [100 x [100 x i32]]]* @D, i32 0, i32 %i.028, i32 %k.026, i32 %j.027
499  %0 = load i32, i32* %arrayidx8
500  %add = add nsw i32 %0, %t
501  store i32 %add, i32* %arrayidx8
502  %inc = add nuw nsw i32 %k.026, 1
503  %exitcond = icmp eq i32 %inc, 100
504  br i1 %exitcond, label %for.inc12, label %for.body6
505
506for.inc12:                                        ; preds = %for.body6
507  %inc13 = add nuw nsw i32 %j.027, 1
508  %exitcond29 = icmp eq i32 %inc13, 100
509  br i1 %exitcond29, label %for.inc15, label %for.cond4.preheader
510
511for.inc15:                                        ; preds = %for.inc12
512  %inc16 = add nuw nsw i32 %i.028, 1
513  %exitcond30 = icmp eq i32 %inc16, 100
514  br i1 %exitcond30, label %for.end17, label %for.cond1.preheader
515
516for.end17:                                        ; preds = %for.inc15
517  ret void
518}
519; CHECK-LABEL: @interchange_08
520; CHECK:   entry:
521; CHECK:     br label %for.cond1.preheader.preheader
522; CHECK:   for.cond1.preheader.preheader:                    ; preds = %entry
523; CHECK:     br label %for.cond1.preheader
524; CHECK:   for.cond1.preheader:                              ; preds = %for.cond1.preheader.preheader, %for.inc15
525; CHECK:     %i.028 = phi i32 [ %inc16, %for.inc15 ], [ 0, %for.cond1.preheader.preheader ]
526; CHECK:     br label %for.body6.preheader
527; CHECK:   for.cond4.preheader.preheader:                    ; preds = %for.body6
528; CHECK:     br label %for.cond4.preheader
529; CHECK:   for.cond4.preheader:                              ; preds = %for.cond4.preheader.preheader, %for.inc12
530; CHECK:     %j.027 = phi i32 [ %inc13, %for.inc12 ], [ 0, %for.cond4.preheader.preheader ]
531; CHECK:     br label %for.body6.split1
532; CHECK:   for.body6.preheader:                              ; preds = %for.cond1.preheader
533; CHECK:     br label %for.body6
534; CHECK:   for.body6:                                        ; preds = %for.body6.preheader, %for.body6.split
535; CHECK:     %k.026 = phi i32 [ %inc, %for.body6.split ], [ 0, %for.body6.preheader ]
536; CHECK:     br label %for.cond4.preheader.preheader
537; CHECK:   for.body6.split1:                                 ; preds = %for.cond4.preheader
538; CHECK:     %arrayidx8 = getelementptr inbounds [100 x [100 x [100 x i32]]], [100 x [100 x [100 x i32]]]* @D, i32 0, i32 %i.028, i32 %k.026, i32 %j.027
539; CHECK:     %0 = load i32, i32* %arrayidx8
540; CHECK:     %add = add nsw i32 %0, %t
541; CHECK:     store i32 %add, i32* %arrayidx8
542; CHECK:     br label %for.inc12
543; CHECK:   for.body6.split:                                  ; preds = %for.inc12
544; CHECK:     %inc = add nuw nsw i32 %k.026, 1
545; CHECK:     %exitcond = icmp eq i32 %inc, 100
546; CHECK:     br i1 %exitcond, label %for.inc15, label %for.body6
547; CHECK:   for.inc12:                                        ; preds = %for.body6.split1
548; CHECK:     %inc13 = add nuw nsw i32 %j.027, 1
549; CHECK:     %exitcond29 = icmp eq i32 %inc13, 100
550; CHECK:     br i1 %exitcond29, label %for.body6.split, label %for.cond4.preheader
551; CHECK:   for.inc15:                                        ; preds = %for.body6.split
552; CHECK:     %inc16 = add nuw nsw i32 %i.028, 1
553; CHECK:     %exitcond30 = icmp eq i32 %inc16, 100
554; CHECK:     br i1 %exitcond30, label %for.end17, label %for.cond1.preheader
555; CHECK:   for.end17:                                        ; preds = %for.inc15
556; CHECK:     ret void
557
558