1 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2 ; RUN: opt < %s -S -passes=loop-unroll -unroll-peel-max-count=4 -verify-dom-info | FileCheck %s
3 ; RUN: opt < %s -S -passes=loop-unroll -unroll-peel-max-count=4 -unroll-allow-loop-nests-peeling -verify-dom-info | FileCheck %s --check-prefix PEELED
8 ; In this case we cannot peel the inner loop, because the condition involves
9 ; the outer induction variable.
10 ; Peel the loop nest if allowed by the flag -unroll-allow-loop-nests-peeling.
11 define void @test1(i32 %k) {
12 ; CHECK-LABEL: @test1(
13 ; CHECK-NEXT: for.body.lr.ph:
14 ; CHECK-NEXT: br label [[OUTER_HEADER:%.*]]
15 ; CHECK: outer.header:
16 ; CHECK-NEXT: [[J:%.*]] = phi i32 [ 0, [[FOR_BODY_LR_PH:%.*]] ], [ [[J_INC:%.*]], [[OUTER_INC:%.*]] ]
17 ; CHECK-NEXT: br label [[FOR_BODY:%.*]]
19 ; CHECK-NEXT: [[I_05:%.*]] = phi i32 [ 0, [[OUTER_HEADER]] ], [ [[INC:%.*]], [[FOR_INC:%.*]] ]
20 ; CHECK-NEXT: [[CMP1:%.*]] = icmp ult i32 [[J]], 2
21 ; CHECK-NEXT: br i1 [[CMP1]], label [[IF_THEN:%.*]], label [[IF_ELSE:%.*]]
23 ; CHECK-NEXT: call void @f1()
24 ; CHECK-NEXT: br label [[FOR_INC]]
26 ; CHECK-NEXT: call void @f2()
27 ; CHECK-NEXT: br label [[FOR_INC]]
29 ; CHECK-NEXT: [[INC]] = add nsw i32 [[I_05]], 1
30 ; CHECK-NEXT: [[CMP:%.*]] = icmp slt i32 [[INC]], [[K:%.*]]
31 ; CHECK-NEXT: br i1 [[CMP]], label [[FOR_BODY]], label [[OUTER_INC]]
33 ; CHECK-NEXT: [[J_INC]] = add nsw i32 [[J]], 1
34 ; CHECK-NEXT: [[OUTER_CMP:%.*]] = icmp slt i32 [[J_INC]], [[K]]
35 ; CHECK-NEXT: br i1 [[OUTER_CMP]], label [[OUTER_HEADER]], label [[FOR_END:%.*]], !llvm.loop !{{.*}}
37 ; CHECK-NEXT: ret void
39 ; PEELED-LABEL: @test1(
40 ; PEELED-NEXT: for.body.lr.ph:
41 ; PEELED-NEXT: br label [[OUTER_HEADER_PEEL_BEGIN:%.*]]
42 ; PEELED: outer.header.peel.begin:
43 ; PEELED-NEXT: br label [[OUTER_HEADER_PEEL:%.*]]
44 ; PEELED: outer.header.peel:
45 ; PEELED-NEXT: br label [[FOR_BODY_PEEL:%.*]]
46 ; PEELED: for.body.peel:
47 ; PEELED-NEXT: [[I_05_PEEL:%.*]] = phi i32 [ 0, [[OUTER_HEADER_PEEL]] ], [ [[INC_PEEL:%.*]], [[FOR_INC_PEEL:%.*]] ]
48 ; PEELED-NEXT: [[CMP1_PEEL:%.*]] = icmp ult i32 0, 2
49 ; PEELED-NEXT: br i1 [[CMP1_PEEL]], label [[IF_THEN_PEEL:%.*]], label [[IF_ELSE_PEEL:%.*]]
50 ; PEELED: if.else.peel:
51 ; PEELED-NEXT: call void @f2()
52 ; PEELED-NEXT: br label [[FOR_INC_PEEL]]
53 ; PEELED: if.then.peel:
54 ; PEELED-NEXT: call void @f1()
55 ; PEELED-NEXT: br label [[FOR_INC_PEEL]]
56 ; PEELED: for.inc.peel:
57 ; PEELED-NEXT: [[INC_PEEL]] = add nsw i32 [[I_05_PEEL]], 1
58 ; PEELED-NEXT: [[CMP_PEEL:%.*]] = icmp slt i32 [[INC_PEEL]], [[K:%.*]]
59 ; PEELED-NEXT: br i1 [[CMP_PEEL]], label [[FOR_BODY_PEEL]], label [[OUTER_INC_PEEL:%.*]]
60 ; PEELED: outer.inc.peel:
61 ; PEELED-NEXT: [[J_INC_PEEL:%.*]] = add nsw i32 0, 1
62 ; PEELED-NEXT: [[OUTER_CMP_PEEL:%.*]] = icmp slt i32 [[J_INC_PEEL]], [[K]]
63 ; PEELED-NEXT: br i1 [[OUTER_CMP_PEEL]], label [[OUTER_HEADER_PEEL_NEXT:%.*]], label [[FOR_END:%[^,]*]]
64 ; Verify that MD_loop metadata is dropped.
65 ; PEELED-NOT: , !llvm.loop !{{[0-9]*}}
66 ; PEELED: outer.header.peel.next:
67 ; PEELED-NEXT: br label [[OUTER_HEADER_PEEL2:%.*]]
68 ; PEELED: outer.header.peel2:
69 ; PEELED-NEXT: br label [[FOR_BODY_PEEL3:%.*]]
70 ; PEELED: for.body.peel3:
71 ; PEELED-NEXT: [[I_05_PEEL4:%.*]] = phi i32 [ 0, [[OUTER_HEADER_PEEL2]] ], [ [[INC_PEEL9:%.*]], [[FOR_INC_PEEL8:%.*]] ]
72 ; PEELED-NEXT: [[CMP1_PEEL5:%.*]] = icmp ult i32 [[J_INC_PEEL]], 2
73 ; PEELED-NEXT: br i1 [[CMP1_PEEL5]], label [[IF_THEN_PEEL7:%.*]], label [[IF_ELSE_PEEL6:%.*]]
74 ; PEELED: if.else.peel6:
75 ; PEELED-NEXT: call void @f2()
76 ; PEELED-NEXT: br label [[FOR_INC_PEEL8]]
77 ; PEELED: if.then.peel7:
78 ; PEELED-NEXT: call void @f1()
79 ; PEELED-NEXT: br label [[FOR_INC_PEEL8]]
80 ; PEELED: for.inc.peel8:
81 ; PEELED-NEXT: [[INC_PEEL9]] = add nsw i32 [[I_05_PEEL4]], 1
82 ; PEELED-NEXT: [[CMP_PEEL10:%.*]] = icmp slt i32 [[INC_PEEL9]], [[K]]
83 ; PEELED-NEXT: br i1 [[CMP_PEEL10]], label [[FOR_BODY_PEEL3]], label [[OUTER_INC_PEEL11:%.*]]
84 ; PEELED: outer.inc.peel11:
85 ; PEELED-NEXT: [[J_INC_PEEL12:%.*]] = add nsw i32 [[J_INC_PEEL]], 1
86 ; PEELED-NEXT: [[OUTER_CMP_PEEL13:%.*]] = icmp slt i32 [[J_INC_PEEL12]], [[K]]
87 ; PEELED-NEXT: br i1 [[OUTER_CMP_PEEL13]], label [[OUTER_HEADER_PEEL_NEXT1:%.*]], label [[FOR_END]]
88 ; Verify that MD_loop metadata is dropped.
89 ; PEELED-NOT: , !llvm.loop !{{[0-9]*}}
90 ; PEELED: outer.header.peel.next1:
91 ; PEELED-NEXT: br label [[OUTER_HEADER_PEEL_NEXT14:%.*]]
92 ; PEELED: outer.header.peel.next14:
93 ; PEELED-NEXT: br label [[FOR_BODY_LR_PH_PEEL_NEWPH:%.*]]
94 ; PEELED: for.body.lr.ph.peel.newph:
95 ; PEELED-NEXT: br label [[OUTER_HEADER:%.*]]
96 ; PEELED: outer.header:
97 ; PEELED-NEXT: [[J:%.*]] = phi i32 [ [[J_INC_PEEL12]], [[FOR_BODY_LR_PH_PEEL_NEWPH]] ], [ [[J_INC:%.*]], [[OUTER_INC:%.*]] ]
98 ; PEELED-NEXT: br label [[FOR_BODY:%.*]]
100 ; PEELED-NEXT: [[I_05:%.*]] = phi i32 [ 0, [[OUTER_HEADER]] ], [ [[INC:%.*]], [[FOR_INC:%.*]] ]
101 ; PEELED-NEXT: br i1 false, label [[IF_THEN:%.*]], label [[IF_ELSE:%.*]]
103 ; PEELED-NEXT: call void @f1()
104 ; PEELED-NEXT: br label [[FOR_INC]]
106 ; PEELED-NEXT: call void @f2()
107 ; PEELED-NEXT: br label [[FOR_INC]]
109 ; PEELED-NEXT: [[INC]] = add nsw i32 [[I_05]], 1
110 ; PEELED-NEXT: [[CMP:%.*]] = icmp slt i32 [[INC]], [[K]]
111 ; PEELED-NEXT: br i1 [[CMP]], label [[FOR_BODY]], label [[OUTER_INC]]
113 ; PEELED-NEXT: [[J_INC]] = add nuw nsw i32 [[J]], 1
114 ; PEELED-NEXT: [[OUTER_CMP:%.*]] = icmp slt i32 [[J_INC]], [[K]]
115 ; PEELED-NEXT: br i1 [[OUTER_CMP]], label [[OUTER_HEADER]], label [[FOR_END_LOOPEXIT:%.*]], !llvm.loop !{{.*}}
116 ; PEELED: for.end.loopexit:
117 ; PEELED-NEXT: br label [[FOR_END]]
119 ; PEELED-NEXT: ret void
122 br label %outer.header
125 %j = phi i32 [ 0, %for.body.lr.ph ], [ %j.inc, %outer.inc ]
129 %i.05 = phi i32 [ 0, %outer.header ], [ %inc, %for.inc ]
130 %cmp1 = icmp ult i32 %j, 2
131 br i1 %cmp1, label %if.then, label %if.else
142 %inc = add nsw i32 %i.05, 1
143 %cmp = icmp slt i32 %inc, %k
144 br i1 %cmp, label %for.body, label %outer.inc
147 %j.inc = add nsw i32 %j, 1
148 %outer.cmp = icmp slt i32 %j.inc, %k
149 br i1 %outer.cmp, label %outer.header, label %for.end, !llvm.loop !0