1; RUN: opt < %s -loop-unroll -unroll-runtime=true -verify-dom-info -verify-loop-info -instcombine -S | FileCheck %s
2; RUN: opt < %s -loop-unroll -unroll-runtime=true -verify-dom-info -unroll-runtime-multi-exit=false -verify-loop-info -S | FileCheck %s -check-prefix=NOUNROLL
3
4; this tests when unrolling multiple exit loop occurs by default (i.e. without specifying -unroll-runtime-multi-exit)
5
6; the second exit block is a deopt block. The loop has one exiting block other than the latch.
7define i32 @test1(i32* nocapture %a, i64 %n) {
8; CHECK-LABEL: test1(
9; CHECK-LABEL:  header.epil:
10; CHECK-NEXT:     %indvars.iv.epil = phi i64 [ %indvars.iv.next.epil, %latch.epil ], [ %indvars.iv.unr, %header.epil.preheader ]
11; CHECK-LABEL:  otherexit.loopexit:
12; CHECK-NEXT:     %sum.02.lcssa.ph = phi i32 [ %sum.02, %for.exiting_block ], [ %add, %for.exiting_block.1 ], [ %add.1, %for.exiting_block.2 ], [ %add.2, %for.exiting_block.3 ], [ %add.3, %for.exiting_block.4 ], [ %add.4, %for.exiting_block.5 ], [ %add.5, %for.exiting_block.6 ],
13; CHECK-NEXT:     br label %otherexit
14; CHECK-LABEL:  otherexit.loopexit3:
15; CHECK-NEXT:     br label %otherexit
16; CHECK-LABEL:  otherexit:
17; CHECK-NEXT:     %sum.02.lcssa = phi i32 [ %sum.02.lcssa.ph, %otherexit.loopexit ], [ %sum.02.epil, %otherexit.loopexit3 ]
18; CHECK-NEXT:     %rval = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"(i32 %sum.02.lcssa) ]
19; CHECK-NEXT:     ret i32 %rval
20; CHECK-LABEL:  latch.7:
21; CHECK:          add i64 %indvars.iv, 8
22
23; NOUNROLL: test1(
24; NOUNROLL-NOT: .epil
25; NOUNROLL-NOT: .prol
26; NOUNROLL:   otherexit:
27; NOUNROLL-NEXT:   %sum.02.lcssa = phi i32 [ %sum.02, %for.exiting_block ]
28; NOUNROLL-NEXT:   %rval = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"(i32 %sum.02.lcssa) ]
29entry:
30  br label %header
31
32header:
33  %indvars.iv = phi i64 [ %indvars.iv.next, %latch ], [ 0, %entry ]
34  %sum.02 = phi i32 [ %add, %latch ], [ 0, %entry ]
35  br label %for.exiting_block
36
37for.exiting_block:
38 %cmp = icmp eq i64 %n, 42
39 br i1 %cmp, label %otherexit, label %latch
40
41latch:
42  %arrayidx = getelementptr inbounds i32, i32* %a, i64 %indvars.iv
43  %0 = load i32, i32* %arrayidx, align 4
44  %add = add nsw i32 %0, %sum.02
45  %indvars.iv.next = add i64 %indvars.iv, 1
46  %exitcond = icmp eq i64 %indvars.iv.next, %n
47  br i1 %exitcond, label %latchexit, label %header
48
49latchexit:                                          ; preds = %latch
50  %sum.0.lcssa = phi i32 [ %add, %latch ]
51  ret i32 %sum.0.lcssa
52
53otherexit:
54  %rval = call i32(...) @llvm.experimental.deoptimize.i32() [ "deopt"(i32 %sum.02) ]
55  ret i32 %rval
56}
57
58; the exit block is not a deopt block.
59define i32 @test2(i32* nocapture %a, i64 %n) {
60; CHECK-LABEL: test2(
61; CHECK-NOT: .epil
62; CHECK-NOT: .prol
63; CHECK-LABEL: otherexit:
64; CHECK-NEXT:    ret i32 %sum.02
65
66entry:
67  br label %header
68
69header:
70  %indvars.iv = phi i64 [ %indvars.iv.next, %latch ], [ 0, %entry ]
71  %sum.02 = phi i32 [ %add, %latch ], [ 0, %entry ]
72  br label %for.exiting_block
73
74for.exiting_block:
75 %cmp = icmp eq i64 %n, 42
76 br i1 %cmp, label %otherexit, label %latch
77
78latch:
79  %arrayidx = getelementptr inbounds i32, i32* %a, i64 %indvars.iv
80  %0 = load i32, i32* %arrayidx, align 4
81  %add = add nsw i32 %0, %sum.02
82  %indvars.iv.next = add i64 %indvars.iv, 1
83  %exitcond = icmp eq i64 %indvars.iv.next, %n
84  br i1 %exitcond, label %latchexit, label %header
85
86latchexit:                                          ; preds = %latch
87  %sum.0.lcssa = phi i32 [ %add, %latch ]
88  ret i32 %sum.0.lcssa
89
90otherexit:
91  %rval = phi i32 [%sum.02, %for.exiting_block ]
92  ret i32 %rval
93}
94declare i32 @llvm.experimental.deoptimize.i32(...)
95