1; RUN: opt < %s -S -debug-only=loop-unroll -loop-unroll 2>&1 | FileCheck %s
2; RUN: opt < %s -S -debug-only=loop-unroll -passes='require<profile-summary>,function(require<opt-remark-emit>,loop-unroll)' 2>&1 | FileCheck %s
3; Confirm that peeling is disabled if the number of counts required to reach
4; the hot percentile is above the threshold.
5; RUN: opt < %s -S -profile-summary-huge-working-set-size-threshold=9 -debug-only=loop-unroll -passes='require<profile-summary>,function(require<opt-remark-emit>,loop-unroll)' 2>&1 | FileCheck %s --check-prefix=NOPEEL
6; REQUIRES: asserts
7
8; Make sure we use the profile information correctly to peel-off 3 iterations
9; from the loop, and update the branch weights for the peeled loop properly.
10
11; CHECK: Loop Unroll: F[basic]
12; CHECK: PEELING loop %for.body with iteration count 4!
13; CHECK: Loop Unroll: F[optsize]
14; CHECK-NOT: PEELING
15
16; Confirm that no peeling occurs when we are performing full unrolling.
17; RUN: opt < %s -S -debug-only=loop-unroll -passes='require<opt-remark-emit>,loop(loop-unroll-full)' 2>&1 | FileCheck %s --check-prefix=NOPEEL
18; NOPEEL-NOT: PEELING
19
20; CHECK-LABEL: @basic
21; CHECK: br i1 %{{.*}}, label %[[NEXT0:.*]], label %for.cond.for.end_crit_edge, !prof !15
22; CHECK: [[NEXT0]]:
23; CHECK: br i1 %{{.*}}, label %[[NEXT1:.*]], label %for.cond.for.end_crit_edge, !prof !16
24; CHECK: [[NEXT1]]:
25; CHECK: br i1 %{{.*}}, label %[[NEXT2:.*]], label %for.cond.for.end_crit_edge, !prof !17
26; CHECK: [[NEXT2]]:
27; CHECK: br i1 %{{.*}}, label %for.body, label %{{.*}}, !prof !18
28
29define void @basic(i32* %p, i32 %k) #0 !prof !15 {
30entry:
31  %cmp3 = icmp slt i32 0, %k
32  br i1 %cmp3, label %for.body.lr.ph, label %for.end
33
34for.body.lr.ph:                                   ; preds = %entry
35  br label %for.body
36
37for.body:                                         ; preds = %for.body.lr.ph, %for.body
38  %i.05 = phi i32 [ 0, %for.body.lr.ph ], [ %inc, %for.body ]
39  %p.addr.04 = phi i32* [ %p, %for.body.lr.ph ], [ %incdec.ptr, %for.body ]
40  %incdec.ptr = getelementptr inbounds i32, i32* %p.addr.04, i32 1
41  store i32 %i.05, i32* %p.addr.04, align 4
42  %inc = add nsw i32 %i.05, 1
43  %cmp = icmp slt i32 %inc, %k
44  br i1 %cmp, label %for.body, label %for.cond.for.end_crit_edge, !prof !16
45
46for.cond.for.end_crit_edge:                       ; preds = %for.body
47  br label %for.end
48
49for.end:                                          ; preds = %for.cond.for.end_crit_edge, %entry
50  ret void
51}
52
53; We don't want to peel loops when optimizing for size.
54; CHECK-LABEL: @optsize
55; CHECK: for.body.lr.ph:
56; CHECK-NEXT: br label %for.body
57; CHECK: for.body:
58; CHECK-NOT: br
59; CHECK: br i1 %cmp, label %for.body, label %for.cond.for.end_crit_edge
60define void @optsize(i32* %p, i32 %k) #1 !prof !15 {
61entry:
62  %cmp3 = icmp slt i32 0, %k
63  br i1 %cmp3, label %for.body.lr.ph, label %for.end
64
65for.body.lr.ph:                                   ; preds = %entry
66  br label %for.body
67
68for.body:                                         ; preds = %for.body.lr.ph, %for.body
69  %i.05 = phi i32 [ 0, %for.body.lr.ph ], [ %inc, %for.body ]
70  %p.addr.04 = phi i32* [ %p, %for.body.lr.ph ], [ %incdec.ptr, %for.body ]
71  %incdec.ptr = getelementptr inbounds i32, i32* %p.addr.04, i32 1
72  store i32 %i.05, i32* %p.addr.04, align 4
73  %inc = add nsw i32 %i.05, 1
74  %cmp = icmp slt i32 %inc, %k
75  br i1 %cmp, label %for.body, label %for.cond.for.end_crit_edge, !prof !16
76
77for.cond.for.end_crit_edge:                       ; preds = %for.body
78  br label %for.end
79
80for.end:                                          ; preds = %for.cond.for.end_crit_edge, %entry
81  ret void
82}
83
84attributes #0 = { nounwind }
85attributes #1 = { nounwind optsize }
86
87!llvm.module.flags = !{!1}
88
89!1 = !{i32 1, !"ProfileSummary", !2}
90!2 = !{!3, !4, !5, !6, !7, !8, !9, !10}
91!3 = !{!"ProfileFormat", !"InstrProf"}
92!4 = !{!"TotalCount", i64 10}
93!5 = !{!"MaxCount", i64 3}
94!6 = !{!"MaxInternalCount", i64 1}
95!7 = !{!"MaxFunctionCount", i64 3}
96!8 = !{!"NumCounts", i64 2}
97!9 = !{!"NumFunctions", i64 2}
98!10 = !{!"DetailedSummary", !11}
99!11 = !{!12, !13, !14}
100!12 = !{i32 10000, i64 3, i32 2}
101!13 = !{i32 999000, i64 1, i32 10}
102!14 = !{i32 999999, i64 1, i32 10}
103!15 = !{!"function_entry_count", i64 1}
104!16 = !{!"branch_weights", i32 3001, i32 1001}
105
106;CHECK: !15 = !{!"branch_weights", i32 3001, i32 1001}
107;CHECK: !16 = !{!"branch_weights", i32 2000, i32 1001}
108;CHECK: !17 = !{!"branch_weights", i32 999, i32 1001}
109;CHECK: !18 = !{!"branch_weights", i32 1, i32 1001}
110
111