1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2; RUN: opt -S -jump-threading < %s | FileCheck %s
3
4declare void @foo()
5declare void @bar()
6declare void @baz()
7declare void @quux()
8
9
10; Jump threading of branch with select as condition.
11; Mostly theoretical since instruction combining simplifies all selects of
12; booleans where at least one operand is true/false/undef.
13
14define void @test_br(i1 %cond, i1 %value) nounwind {
15; CHECK-LABEL: @test_br(
16; CHECK-NEXT:  entry:
17; CHECK-NEXT:    br i1 [[COND:%.*]], label [[L1:%.*]], label [[L0:%.*]]
18; CHECK:       L0:
19; CHECK-NEXT:    call void @baz()
20; CHECK-NEXT:    [[EXPR:%.*]] = select i1 [[COND]], i1 true, i1 [[VALUE:%.*]]
21; CHECK-NEXT:    br i1 [[EXPR]], label [[L1]], label [[L2:%.*]]
22; CHECK:       L1:
23; CHECK-NEXT:    call void @foo()
24; CHECK-NEXT:    ret void
25; CHECK:       L2:
26; CHECK-NEXT:    call void @bar()
27; CHECK-NEXT:    ret void
28;
29entry:
30  br i1 %cond, label %L0, label %L3
31L0:
32  %expr = select i1 %cond, i1 true, i1 %value
33  br i1 %expr, label %L1, label %L2
34
35L1:
36  call void @foo()
37  ret void
38L2:
39  call void @bar()
40  ret void
41L3:
42  call void @baz()
43  br label %L0
44}
45
46
47; Jump threading of switch with select as condition.
48
49define void @test_switch(i1 %cond, i8 %value) nounwind {
50; CHECK-LABEL: @test_switch(
51; CHECK-NEXT:  entry:
52; CHECK-NEXT:    br i1 [[COND:%.*]], label [[L1:%.*]], label [[L0:%.*]]
53; CHECK:       L0:
54; CHECK-NEXT:    call void @quux()
55; CHECK-NEXT:    [[EXPR:%.*]] = select i1 [[COND]], i8 1, i8 [[VALUE:%.*]]
56; CHECK-NEXT:    switch i8 [[EXPR]], label [[L3:%.*]] [
57; CHECK-NEXT:    i8 1, label [[L1]]
58; CHECK-NEXT:    i8 2, label [[L2:%.*]]
59; CHECK-NEXT:    ]
60; CHECK:       L1:
61; CHECK-NEXT:    call void @foo()
62; CHECK-NEXT:    ret void
63; CHECK:       L2:
64; CHECK-NEXT:    call void @bar()
65; CHECK-NEXT:    ret void
66; CHECK:       L3:
67; CHECK-NEXT:    call void @baz()
68; CHECK-NEXT:    ret void
69;
70entry:
71  br i1 %cond, label %L0, label %L4
72L0:
73  %expr = select i1 %cond, i8 1, i8 %value
74  switch i8 %expr, label %L3 [i8 1, label %L1 i8 2, label %L2]
75
76L1:
77  call void @foo()
78  ret void
79L2:
80  call void @bar()
81  ret void
82L3:
83  call void @baz()
84  ret void
85L4:
86  call void @quux()
87  br label %L0
88}
89
90; Make sure the blocks in the indirectbr test aren't trivially removable as
91; successors by taking their addresses.
92@anchor = constant [3 x i8*] [
93  i8* blockaddress(@test_indirectbr, %L1),
94  i8* blockaddress(@test_indirectbr, %L2),
95  i8* blockaddress(@test_indirectbr, %L3)
96]
97
98
99; Jump threading of indirectbr with select as address.
100
101define void @test_indirectbr(i1 %cond, i8* %address) nounwind {
102; CHECK-LABEL: @test_indirectbr(
103; CHECK-NEXT:  entry:
104; CHECK-NEXT:    br i1 [[COND:%.*]], label [[L1:%.*]], label [[L3:%.*]]
105; CHECK:       L1:
106; CHECK-NEXT:    call void @foo()
107; CHECK-NEXT:    ret void
108; CHECK:       L3:
109; CHECK-NEXT:    call void @baz()
110; CHECK-NEXT:    ret void
111;
112entry:
113  br i1 %cond, label %L0, label %L3
114L0:
115  %indirect.goto.dest = select i1 %cond, i8* blockaddress(@test_indirectbr, %L1), i8* %address
116  indirectbr i8* %indirect.goto.dest, [label %L1, label %L2, label %L3]
117
118L1:
119  call void @foo()
120  ret void
121L2:
122  call void @bar()
123  ret void
124L3:
125  call void @baz()
126  ret void
127}
128
129
130; Jump threading of indirectbr with select as address.  Test increased
131; duplication threshold for cases where indirectbr is being threaded
132; through.
133
134define void @test_indirectbr_thresh(i1 %cond, i8* %address) nounwind {
135; CHECK-LABEL: @test_indirectbr_thresh(
136; CHECK-NEXT:  entry:
137; CHECK-NEXT:    br i1 [[COND:%.*]], label [[L1:%.*]], label [[L3:%.*]]
138; CHECK:       L1:
139; CHECK-NEXT:    call void @quux()
140; CHECK-NEXT:    call void @quux()
141; CHECK-NEXT:    call void @quux()
142; CHECK-NEXT:    call void @foo()
143; CHECK-NEXT:    ret void
144; CHECK:       L3:
145; CHECK-NEXT:    call void @baz()
146; CHECK-NEXT:    ret void
147;
148entry:
149  br i1 %cond, label %L0, label %L3
150L0:
151  %indirect.goto.dest = select i1 %cond, i8* blockaddress(@test_indirectbr_thresh, %L1), i8* %address
152  call void @quux()
153  call void @quux()
154  call void @quux()
155  indirectbr i8* %indirect.goto.dest, [label %L1, label %L2, label %L3]
156
157L1:
158  call void @foo()
159  ret void
160L2:
161  call void @bar()
162  ret void
163L3:
164  call void @baz()
165  ret void
166}
167
168
169; A more complicated case: the condition is a select based on a comparison.
170
171define void @test_switch_cmp(i1 %cond, i32 %val, i8 %value) nounwind {
172; CHECK-LABEL: @test_switch_cmp(
173; CHECK-NEXT:  entry:
174; CHECK-NEXT:    br i1 [[COND:%.*]], label [[L0:%.*]], label [[L0_THREAD:%.*]]
175; CHECK:       L0:
176; CHECK-NEXT:    [[VAL_PHI:%.*]] = phi i32 [ [[VAL:%.*]], [[ENTRY:%.*]] ]
177; CHECK-NEXT:    [[CMP:%.*]] = icmp slt i32 [[VAL_PHI]], 0
178; CHECK-NEXT:    [[COND_FR:%.*]] = freeze i1 [[CMP]]
179; CHECK-NEXT:    br i1 [[COND_FR]], label [[L1:%.*]], label [[TMP0:%.*]]
180; CHECK:       0:
181; CHECK-NEXT:    [[TMP1:%.*]] = phi i8 [ [[VALUE:%.*]], [[L0]] ]
182; CHECK-NEXT:    switch i8 [[TMP1]], label [[L3:%.*]] [
183; CHECK-NEXT:    i8 1, label [[L1]]
184; CHECK-NEXT:    i8 2, label [[L2:%.*]]
185; CHECK-NEXT:    ]
186; CHECK:       L1:
187; CHECK-NEXT:    call void @foo()
188; CHECK-NEXT:    ret void
189; CHECK:       L2:
190; CHECK-NEXT:    call void @bar()
191; CHECK-NEXT:    ret void
192; CHECK:       L3:
193; CHECK-NEXT:    call void @baz()
194; CHECK-NEXT:    ret void
195; CHECK:       L0.thread:
196; CHECK-NEXT:    call void @quux()
197; CHECK-NEXT:    br label [[L1]]
198;
199entry:
200  br i1 %cond, label %L0, label %L4
201L0:
202  %val.phi = phi i32 [%val, %entry], [-1, %L4]
203  %cmp = icmp slt i32 %val.phi, 0
204  %expr = select i1 %cmp, i8 1, i8 %value
205  switch i8 %expr, label %L3 [i8 1, label %L1 i8 2, label %L2]
206
207L1:
208  call void @foo()
209  ret void
210L2:
211  call void @bar()
212  ret void
213L3:
214  call void @baz()
215  ret void
216L4:
217  call void @quux()
218  br label %L0
219}
220
221; Make sure the edge value of %0 from entry to L2 includes 0 and L3 is
222; reachable.
223define void @test_switch_default(i32* nocapture %status) nounwind {
224; CHECK-LABEL: @test_switch_default(
225; CHECK-NEXT:  entry:
226; CHECK-NEXT:    [[TMP0:%.*]] = load i32, i32* [[STATUS:%.*]], align 4
227; CHECK-NEXT:    switch i32 [[TMP0]], label [[L2:%.*]] [
228; CHECK-NEXT:    i32 5061, label [[L2_THREAD:%.*]]
229; CHECK-NEXT:    i32 0, label [[L2]]
230; CHECK-NEXT:    ]
231; CHECK:       L2.thread:
232; CHECK-NEXT:    store i32 10025, i32* [[STATUS]], align 4
233; CHECK-NEXT:    br label [[L4:%.*]]
234; CHECK:       L2:
235; CHECK-NEXT:    [[TMP1:%.*]] = phi i32 [ [[TMP0]], [[ENTRY:%.*]] ], [ [[TMP0]], [[ENTRY]] ]
236; CHECK-NEXT:    [[CMP57_I:%.*]] = icmp eq i32 [[TMP1]], 0
237; CHECK-NEXT:    br i1 [[CMP57_I]], label [[L3:%.*]], label [[L4]]
238; CHECK:       L3:
239; CHECK-NEXT:    store i32 10000, i32* [[STATUS]], align 4
240; CHECK-NEXT:    br label [[L4]]
241; CHECK:       L4:
242; CHECK-NEXT:    ret void
243;
244entry:
245  %0 = load i32, i32* %status, align 4
246  switch i32 %0, label %L2 [
247  i32 5061, label %L1
248  i32 0, label %L2
249  ]
250
251L1:
252  store i32 10025, i32* %status, align 4
253  br label %L2
254
255L2:
256  %1 = load i32, i32* %status, align 4
257  %cmp57.i = icmp eq i32 %1, 0
258  br i1 %cmp57.i, label %L3, label %L4
259
260L3:
261  store i32 10000, i32* %status, align 4
262  br label %L4
263
264L4:
265  ret void
266}
267
268define void @unfold1(double %x, double %y) nounwind {
269; CHECK-LABEL: @unfold1(
270; CHECK-NEXT:  entry:
271; CHECK-NEXT:    [[SUB:%.*]] = fsub double [[X:%.*]], [[Y:%.*]]
272; CHECK-NEXT:    [[CMP:%.*]] = fcmp ogt double [[SUB]], 1.000000e+01
273; CHECK-NEXT:    br i1 [[CMP]], label [[COND_END4:%.*]], label [[COND_FALSE:%.*]]
274; CHECK:       cond.false:
275; CHECK-NEXT:    [[ADD:%.*]] = fadd double [[X]], [[Y]]
276; CHECK-NEXT:    [[CMP1:%.*]] = fcmp ogt double [[ADD]], 1.000000e+01
277; CHECK-NEXT:    br i1 [[CMP1]], label [[COND_END4]], label [[IF_THEN:%.*]]
278; CHECK:       cond.end4:
279; CHECK-NEXT:    [[COND5:%.*]] = phi double [ [[SUB]], [[ENTRY:%.*]] ], [ [[ADD]], [[COND_FALSE]] ]
280; CHECK-NEXT:    [[CMP6:%.*]] = fcmp oeq double [[COND5]], 0.000000e+00
281; CHECK-NEXT:    br i1 [[CMP6]], label [[IF_THEN]], label [[IF_END:%.*]]
282; CHECK:       if.then:
283; CHECK-NEXT:    call void @foo()
284; CHECK-NEXT:    br label [[IF_END]]
285; CHECK:       if.end:
286; CHECK-NEXT:    ret void
287;
288entry:
289  %sub = fsub double %x, %y
290  %cmp = fcmp ogt double %sub, 1.000000e+01
291  br i1 %cmp, label %cond.end4, label %cond.false
292
293cond.false:                                       ; preds = %entry
294  %add = fadd double %x, %y
295  %cmp1 = fcmp ogt double %add, 1.000000e+01
296  %add. = select i1 %cmp1, double %add, double 0.000000e+00
297  br label %cond.end4
298
299cond.end4:                                        ; preds = %entry, %cond.false
300  %cond5 = phi double [ %add., %cond.false ], [ %sub, %entry ]
301  %cmp6 = fcmp oeq double %cond5, 0.000000e+00
302  br i1 %cmp6, label %if.then, label %if.end
303
304if.then:                                          ; preds = %cond.end4
305  call void @foo()
306  br label %if.end
307
308if.end:                                           ; preds = %if.then, %cond.end4
309  ret void
310
311}
312
313
314define void @unfold2(i32 %x, i32 %y) nounwind {
315; CHECK-LABEL: @unfold2(
316; CHECK-NEXT:  entry:
317; CHECK-NEXT:    [[SUB:%.*]] = sub nsw i32 [[X:%.*]], [[Y:%.*]]
318; CHECK-NEXT:    [[CMP:%.*]] = icmp sgt i32 [[SUB]], 10
319; CHECK-NEXT:    br i1 [[CMP]], label [[IF_END:%.*]], label [[COND_FALSE:%.*]]
320; CHECK:       cond.false:
321; CHECK-NEXT:    [[ADD:%.*]] = add nsw i32 [[X]], [[Y]]
322; CHECK-NEXT:    [[CMP1:%.*]] = icmp sgt i32 [[ADD]], 10
323; CHECK-NEXT:    br i1 [[CMP1]], label [[IF_THEN:%.*]], label [[COND_END4:%.*]]
324; CHECK:       cond.end4:
325; CHECK-NEXT:    [[COND5:%.*]] = phi i32 [ [[ADD]], [[COND_FALSE]] ]
326; CHECK-NEXT:    [[CMP6:%.*]] = icmp eq i32 [[COND5]], 0
327; CHECK-NEXT:    br i1 [[CMP6]], label [[IF_THEN]], label [[IF_END]]
328; CHECK:       if.then:
329; CHECK-NEXT:    call void @foo()
330; CHECK-NEXT:    br label [[IF_END]]
331; CHECK:       if.end:
332; CHECK-NEXT:    ret void
333;
334entry:
335  %sub = sub nsw i32 %x, %y
336  %cmp = icmp sgt i32 %sub, 10
337  br i1 %cmp, label %cond.end4, label %cond.false
338
339cond.false:                                       ; preds = %entry
340  %add = add nsw i32 %x, %y
341  %cmp1 = icmp sgt i32 %add, 10
342  %add. = select i1 %cmp1, i32 0, i32 %add
343  br label %cond.end4
344
345cond.end4:                                        ; preds = %entry, %cond.false
346  %cond5 = phi i32 [ %add., %cond.false ], [ %sub, %entry ]
347  %cmp6 = icmp eq i32 %cond5, 0
348  br i1 %cmp6, label %if.then, label %if.end
349
350if.then:                                          ; preds = %cond.end4
351  call void @foo()
352  br label %if.end
353
354if.end:                                           ; preds = %if.then, %cond.end4
355  ret void
356
357}
358
359
360define i32 @unfold3(i32 %u, i32 %v, i32 %w, i32 %x, i32 %y, i32 %z, i32 %j) nounwind {
361; CHECK-LABEL: @unfold3(
362; CHECK-NEXT:  entry:
363; CHECK-NEXT:    [[ADD3:%.*]] = add nsw i32 [[J:%.*]], 2
364; CHECK-NEXT:    [[CMP_I:%.*]] = icmp slt i32 [[U:%.*]], [[V:%.*]]
365; CHECK-NEXT:    br i1 [[CMP_I]], label [[DOTEXIT_THREAD4:%.*]], label [[COND_FALSE_I:%.*]]
366; CHECK:       cond.false.i:
367; CHECK-NEXT:    [[CMP4_I:%.*]] = icmp sgt i32 [[U]], [[V]]
368; CHECK-NEXT:    br i1 [[CMP4_I]], label [[DOTEXIT_THREAD:%.*]], label [[COND_FALSE_6_I:%.*]]
369; CHECK:       cond.false.6.i:
370; CHECK-NEXT:    [[CMP8_I:%.*]] = icmp slt i32 [[W:%.*]], [[X:%.*]]
371; CHECK-NEXT:    br i1 [[CMP8_I]], label [[DOTEXIT_THREAD4]], label [[COND_FALSE_10_I:%.*]]
372; CHECK:       cond.false.10.i:
373; CHECK-NEXT:    [[CMP13_I:%.*]] = icmp sgt i32 [[W]], [[X]]
374; CHECK-NEXT:    br i1 [[CMP13_I]], label [[DOTEXIT_THREAD]], label [[DOTEXIT:%.*]]
375; CHECK:       .exit:
376; CHECK-NEXT:    [[PHITMP:%.*]] = icmp sge i32 [[Y:%.*]], [[Z:%.*]]
377; CHECK-NEXT:    [[COND_FR:%.*]] = freeze i1 [[PHITMP]]
378; CHECK-NEXT:    br i1 [[COND_FR]], label [[DOTEXIT_THREAD]], label [[DOTEXIT_THREAD4]]
379; CHECK:       .exit.thread:
380; CHECK-NEXT:    br label [[DOTEXIT_THREAD4]]
381; CHECK:       .exit.thread4:
382; CHECK-NEXT:    [[TMP0:%.*]] = phi i32 [ [[J]], [[DOTEXIT_THREAD]] ], [ [[ADD3]], [[DOTEXIT]] ], [ [[ADD3]], [[ENTRY:%.*]] ], [ [[ADD3]], [[COND_FALSE_6_I]] ]
383; CHECK-NEXT:    ret i32 [[TMP0]]
384;
385entry:
386  %add3 = add nsw i32 %j, 2
387  %cmp.i = icmp slt i32 %u, %v
388  br i1 %cmp.i, label %.exit, label %cond.false.i
389
390cond.false.i:                                     ; preds = %entry
391  %cmp4.i = icmp sgt i32 %u, %v
392  br i1 %cmp4.i, label %.exit, label %cond.false.6.i
393
394cond.false.6.i:                                   ; preds = %cond.false.i
395  %cmp8.i = icmp slt i32 %w, %x
396  br i1 %cmp8.i, label %.exit, label %cond.false.10.i
397
398cond.false.10.i:                                  ; preds = %cond.false.6.i
399  %cmp13.i = icmp sgt i32 %w, %x
400  br i1 %cmp13.i, label %.exit, label %cond.false.15.i
401
402cond.false.15.i:                                  ; preds = %cond.false.10.i
403  %phitmp = icmp sge i32 %y, %z
404  br label %.exit
405
406.exit:                                  ; preds = %entry, %cond.false.i, %cond.false.6.i, %cond.false.10.i, %cond.false.15.i
407  %cond23.i = phi i1 [ false, %entry ], [ true, %cond.false.i ], [ false, %cond.false.6.i ], [ %phitmp, %cond.false.15.i ], [ true, %cond.false.10.i ]
408  %j.add3 = select i1 %cond23.i, i32 %j, i32 %add3
409  ret i32 %j.add3
410
411}
412
413define i32 @unfold4(i32 %u, i32 %v, i32 %w, i32 %x, i32 %y, i32 %z, i32 %j) nounwind {
414; CHECK-LABEL: @unfold4(
415; CHECK-NEXT:  entry:
416; CHECK-NEXT:    [[ADD3:%.*]] = add nsw i32 [[J:%.*]], 2
417; CHECK-NEXT:    [[CMP_I:%.*]] = icmp slt i32 [[U:%.*]], [[V:%.*]]
418; CHECK-NEXT:    br i1 [[CMP_I]], label [[DOTEXIT_THREAD:%.*]], label [[COND_FALSE_I:%.*]]
419; CHECK:       cond.false.i:
420; CHECK-NEXT:    [[CMP4_I:%.*]] = icmp sgt i32 [[U]], [[V]]
421; CHECK-NEXT:    br i1 [[CMP4_I]], label [[DOTEXIT_THREAD5:%.*]], label [[COND_FALSE_6_I:%.*]]
422; CHECK:       cond.false.6.i:
423; CHECK-NEXT:    [[CMP8_I:%.*]] = icmp slt i32 [[W:%.*]], [[X:%.*]]
424; CHECK-NEXT:    br i1 [[CMP8_I]], label [[DOTEXIT_THREAD]], label [[COND_FALSE_10_I:%.*]]
425; CHECK:       cond.false.10.i:
426; CHECK-NEXT:    [[CMP13_I:%.*]] = icmp sgt i32 [[W]], [[X]]
427; CHECK-NEXT:    br i1 [[CMP13_I]], label [[DOTEXIT_THREAD5]], label [[DOTEXIT:%.*]]
428; CHECK:       .exit:
429; CHECK-NEXT:    [[CMP19_I:%.*]] = icmp sge i32 [[Y:%.*]], [[Z:%.*]]
430; CHECK-NEXT:    [[CONV:%.*]] = zext i1 [[CMP19_I]] to i32
431; CHECK-NEXT:    [[LNOT_I18:%.*]] = icmp eq i32 [[CONV]], 1
432; CHECK-NEXT:    [[COND_FR:%.*]] = freeze i1 [[LNOT_I18]]
433; CHECK-NEXT:    br i1 [[COND_FR]], label [[DOTEXIT_THREAD]], label [[DOTEXIT_THREAD5]]
434; CHECK:       .exit.thread:
435; CHECK-NEXT:    br label [[DOTEXIT_THREAD5]]
436; CHECK:       .exit.thread5:
437; CHECK-NEXT:    [[TMP0:%.*]] = phi i32 [ [[J]], [[DOTEXIT_THREAD]] ], [ [[ADD3]], [[DOTEXIT]] ], [ [[ADD3]], [[COND_FALSE_I]] ], [ [[ADD3]], [[COND_FALSE_10_I]] ]
438; CHECK-NEXT:    ret i32 [[TMP0]]
439;
440entry:
441  %add3 = add nsw i32 %j, 2
442  %cmp.i = icmp slt i32 %u, %v
443  br i1 %cmp.i, label %.exit, label %cond.false.i
444
445cond.false.i:                                     ; preds = %entry
446  %cmp4.i = icmp sgt i32 %u, %v
447  br i1 %cmp4.i, label %.exit, label %cond.false.6.i
448
449cond.false.6.i:                                   ; preds = %cond.false.i
450  %cmp8.i = icmp slt i32 %w, %x
451  br i1 %cmp8.i, label %.exit, label %cond.false.10.i
452
453cond.false.10.i:                                  ; preds = %cond.false.6.i
454  %cmp13.i = icmp sgt i32 %w, %x
455  br i1 %cmp13.i, label %.exit, label %cond.false.15.i
456
457cond.false.15.i:                                  ; preds = %cond.false.10.i
458  %cmp19.i = icmp sge i32 %y, %z
459  %conv = zext i1 %cmp19.i to i32
460  br label %.exit
461
462.exit:                                  ; preds = %entry, %cond.false.i, %cond.false.6.i, %cond.false.10.i, %cond.false.15.i
463  %cond23.i = phi i32 [ 1, %entry ], [ 0, %cond.false.i ], [ 1, %cond.false.6.i ], [ %conv, %cond.false.15.i ], [ 0, %cond.false.10.i ]
464  %lnot.i18 = icmp eq i32 %cond23.i, 1
465  %j.add3 = select i1 %lnot.i18, i32 %j, i32 %add3
466  ret i32 %j.add3
467
468}
469
470define i32 @unfold5(i32 %u, i32 %v, i32 %w, i32 %x, i32 %y, i32 %z, i32 %j) nounwind {
471; CHECK-LABEL: @unfold5(
472; CHECK-NEXT:  entry:
473; CHECK-NEXT:    [[ADD3:%.*]] = add nsw i32 [[J:%.*]], 2
474; CHECK-NEXT:    [[CMP_I:%.*]] = icmp slt i32 [[U:%.*]], [[V:%.*]]
475; CHECK-NEXT:    br i1 [[CMP_I]], label [[DOTEXIT:%.*]], label [[COND_FALSE_I:%.*]]
476; CHECK:       cond.false.i:
477; CHECK-NEXT:    [[CMP4_I:%.*]] = icmp sgt i32 [[U]], [[V]]
478; CHECK-NEXT:    br i1 [[CMP4_I]], label [[DOTEXIT]], label [[COND_FALSE_6_I:%.*]]
479; CHECK:       cond.false.6.i:
480; CHECK-NEXT:    [[CMP8_I:%.*]] = icmp slt i32 [[W:%.*]], [[X:%.*]]
481; CHECK-NEXT:    br i1 [[CMP8_I]], label [[DOTEXIT]], label [[COND_FALSE_10_I:%.*]]
482; CHECK:       cond.false.10.i:
483; CHECK-NEXT:    [[CMP13_I:%.*]] = icmp sgt i32 [[W]], [[X]]
484; CHECK-NEXT:    br i1 [[CMP13_I]], label [[DOTEXIT]], label [[COND_FALSE_15_I:%.*]]
485; CHECK:       cond.false.15.i:
486; CHECK-NEXT:    [[CMP19_I:%.*]] = icmp sge i32 [[Y:%.*]], [[Z:%.*]]
487; CHECK-NEXT:    [[CONV:%.*]] = zext i1 [[CMP19_I]] to i32
488; CHECK-NEXT:    br label [[DOTEXIT]]
489; CHECK:       .exit:
490; CHECK-NEXT:    [[TMP0:%.*]] = phi i32 [ [[J]], [[COND_FALSE_10_I]] ], [ [[CONV]], [[COND_FALSE_15_I]] ], [ 1, [[COND_FALSE_6_I]] ], [ 3, [[COND_FALSE_I]] ], [ 2, [[ENTRY:%.*]] ]
491; CHECK-NEXT:    ret i32 [[TMP0]]
492;
493entry:
494  %add3 = add nsw i32 %j, 2
495  %cmp.i = icmp slt i32 %u, %v
496  br i1 %cmp.i, label %.exit, label %cond.false.i
497
498cond.false.i:                                     ; preds = %entry
499  %cmp4.i = icmp sgt i32 %u, %v
500  br i1 %cmp4.i, label %.exit, label %cond.false.6.i
501
502cond.false.6.i:                                   ; preds = %cond.false.i
503  %cmp8.i = icmp slt i32 %w, %x
504  br i1 %cmp8.i, label %.exit, label %cond.false.10.i
505
506cond.false.10.i:                                  ; preds = %cond.false.6.i
507  %cmp13.i = icmp sgt i32 %w, %x
508  br i1 %cmp13.i, label %.exit, label %cond.false.15.i
509
510cond.false.15.i:                                  ; preds = %cond.false.10.i
511  %cmp19.i = icmp sge i32 %y, %z
512  %conv = zext i1 %cmp19.i to i32
513  br label %.exit
514
515.exit:                                  ; preds = %entry, %cond.false.i, %cond.false.6.i, %cond.false.10.i, %cond.false.15.i
516  %cond23.i = phi i32 [ 2, %entry ], [ 3, %cond.false.i ], [ 1, %cond.false.6.i ], [ %conv, %cond.false.15.i ], [ 7, %cond.false.10.i ]
517  %lnot.i18 = icmp sgt i32 %cond23.i, 5
518  %j.add3 = select i1 %lnot.i18, i32 %j, i32 %cond23.i
519  ret i32 %j.add3
520
521}
522
523; When a select has a constant operand in one branch, and it feeds a phi node
524; and the phi node feeds a switch we unfold the select
525define void @test_func(i32* nocapture readonly %a, i32* nocapture readonly %b, i32* nocapture readonly %c, i32 %n) local_unnamed_addr #0 {
526; CHECK-LABEL: @test_func(
527; CHECK-NEXT:  entry:
528; CHECK-NEXT:    br label [[FOR_COND:%.*]]
529; CHECK:       for.cond:
530; CHECK-NEXT:    [[I_0:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[INC:%.*]], [[SW_DEFAULT:%.*]] ]
531; CHECK-NEXT:    [[CMP:%.*]] = icmp slt i32 [[I_0]], [[N:%.*]]
532; CHECK-NEXT:    br i1 [[CMP]], label [[FOR_BODY:%.*]], label [[FOR_COND_CLEANUP:%.*]]
533; CHECK:       for.cond.cleanup:
534; CHECK-NEXT:    ret void
535; CHECK:       for.body:
536; CHECK-NEXT:    [[TMP0:%.*]] = zext i32 [[I_0]] to i64
537; CHECK-NEXT:    [[ARRAYIDX:%.*]] = getelementptr inbounds i32, i32* [[A:%.*]], i64 [[TMP0]]
538; CHECK-NEXT:    [[TMP1:%.*]] = load i32, i32* [[ARRAYIDX]], align 4
539; CHECK-NEXT:    [[CMP1:%.*]] = icmp eq i32 [[TMP1]], 4
540; CHECK-NEXT:    br i1 [[CMP1]], label [[LAND_LHS_TRUE:%.*]], label [[IF_END:%.*]]
541; CHECK:       land.lhs.true:
542; CHECK-NEXT:    [[ARRAYIDX3:%.*]] = getelementptr inbounds i32, i32* [[B:%.*]], i64 [[TMP0]]
543; CHECK-NEXT:    [[TMP2:%.*]] = load i32, i32* [[ARRAYIDX3]], align 4
544; CHECK-NEXT:    [[ARRAYIDX5:%.*]] = getelementptr inbounds i32, i32* [[C:%.*]], i64 [[TMP0]]
545; CHECK-NEXT:    [[TMP3:%.*]] = load i32, i32* [[ARRAYIDX5]], align 4
546; CHECK-NEXT:    [[CMP6:%.*]] = icmp eq i32 [[TMP2]], [[TMP3]]
547; CHECK-NEXT:    br i1 [[CMP6]], label [[SW_BB:%.*]], label [[SW_BB7:%.*]]
548; CHECK:       if.end:
549; CHECK-NEXT:    [[LOCAL_VAR_0:%.*]] = phi i32 [ [[TMP1]], [[FOR_BODY]] ]
550; CHECK-NEXT:    switch i32 [[LOCAL_VAR_0]], label [[SW_DEFAULT]] [
551; CHECK-NEXT:    i32 2, label [[SW_BB]]
552; CHECK-NEXT:    i32 4, label [[SW_BB7]]
553; CHECK-NEXT:    i32 5, label [[SW_BB8:%.*]]
554; CHECK-NEXT:    i32 7, label [[SW_BB9:%.*]]
555; CHECK-NEXT:    ]
556; CHECK:       sw.bb:
557; CHECK-NEXT:    call void @foo()
558; CHECK-NEXT:    br label [[SW_BB7]]
559; CHECK:       sw.bb7:
560; CHECK-NEXT:    call void @bar()
561; CHECK-NEXT:    br label [[SW_BB8]]
562; CHECK:       sw.bb8:
563; CHECK-NEXT:    call void @baz()
564; CHECK-NEXT:    br label [[SW_BB9]]
565; CHECK:       sw.bb9:
566; CHECK-NEXT:    call void @quux()
567; CHECK-NEXT:    br label [[SW_DEFAULT]]
568; CHECK:       sw.default:
569; CHECK-NEXT:    call void @baz()
570; CHECK-NEXT:    [[INC]] = add nuw nsw i32 [[I_0]], 1
571; CHECK-NEXT:    br label [[FOR_COND]]
572;
573entry:
574  br label %for.cond
575
576for.cond:                                         ; preds = %sw.default, %entry
577  %i.0 = phi i32 [ 0, %entry ], [ %inc, %sw.default ]
578  %cmp = icmp slt i32 %i.0, %n
579  br i1 %cmp, label %for.body, label %for.cond.cleanup
580
581for.cond.cleanup:                                 ; preds = %for.cond
582  ret void
583
584for.body:                                         ; preds = %for.cond
585  %0 = zext i32 %i.0 to i64
586  %arrayidx = getelementptr inbounds i32, i32* %a, i64 %0
587  %1 = load i32, i32* %arrayidx, align 4
588  %cmp1 = icmp eq i32 %1, 4
589  br i1 %cmp1, label %land.lhs.true, label %if.end
590
591land.lhs.true:                                    ; preds = %for.body
592  %arrayidx3 = getelementptr inbounds i32, i32* %b, i64 %0
593  %2 = load i32, i32* %arrayidx3, align 4
594  %arrayidx5 = getelementptr inbounds i32, i32* %c, i64 %0
595  %3 = load i32, i32* %arrayidx5, align 4
596  %cmp6 = icmp eq i32 %2, %3
597  %spec.select = select i1 %cmp6, i32 2, i32 4
598  br label %if.end
599
600if.end:                                           ; preds = %land.lhs.true, %for.body
601  %local_var.0 = phi i32 [ %1, %for.body ], [ %spec.select, %land.lhs.true ]
602  switch i32 %local_var.0, label %sw.default [
603  i32 2, label %sw.bb
604  i32 4, label %sw.bb7
605  i32 5, label %sw.bb8
606  i32 7, label %sw.bb9
607  ]
608
609sw.bb:                                            ; preds = %if.end
610  call void @foo()
611  br label %sw.bb7
612
613sw.bb7:                                           ; preds = %if.end, %sw.bb
614  call void @bar()
615  br label %sw.bb8
616
617sw.bb8:                                           ; preds = %if.end, %sw.bb7
618  call void @baz()
619  br label %sw.bb9
620
621sw.bb9:                                           ; preds = %if.end, %sw.bb8
622  call void @quux()
623  br label %sw.default
624
625sw.default:                                       ; preds = %if.end, %sw.bb9
626  call void @baz()
627  %inc = add nuw nsw i32 %i.0, 1
628  br label %for.cond
629}
630
631define i32 @TryToUnfoldSelectInCurrBB(i1 %b, i1 %ui, i32 %s, i1 %x) {
632; CHECK-LABEL: @TryToUnfoldSelectInCurrBB(
633; CHECK-NEXT:  entry:
634; CHECK-NEXT:    br i1 [[B:%.*]], label [[IF_END_THREAD:%.*]], label [[IF_END:%.*]]
635; CHECK:       if.end:
636; CHECK-NEXT:    [[COND_FR:%.*]] = freeze i1 [[X:%.*]]
637; CHECK-NEXT:    br i1 [[COND_FR]], label [[TMP0:%.*]], label [[IF_END_THREAD]]
638; CHECK:       0:
639; CHECK-NEXT:    br label [[IF_END_THREAD]]
640; CHECK:       if.end.thread:
641; CHECK-NEXT:    [[TMP1:%.*]] = phi i32 [ [[S:%.*]], [[TMP0]] ], [ 42, [[IF_END]] ], [ 42, [[ENTRY:%.*]] ]
642; CHECK-NEXT:    ret i32 [[TMP1]]
643;
644entry:
645  br i1 %b, label %if.end, label %if.else
646
647if.else:
648  br label %if.end
649
650if.end:
651  %v = phi i1 [ %x, %if.else ], [ false, %entry ]
652  %v1 = select i1 %v, i32 %s, i32 42
653  ret i32 %v1
654}
655