1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2; RUN: opt -loop-unroll -simplifycfg -instcombine -simplifycfg -S -mtriple arm-none-eabi -mcpu=cortex-m7 %s | FileCheck %s
3
4; This test is meant to check that this loop is unrolled into three iterations.
5define void @test(i32* %x, i32 %n) {
6; CHECK-LABEL: @test(
7; CHECK-NEXT:  entry:
8; CHECK-NEXT:    [[SUB:%.*]] = add nsw i32 [[N:%.*]], -1
9; CHECK-NEXT:    [[REM:%.*]] = srem i32 [[SUB]], 4
10; CHECK-NEXT:    [[CMP7:%.*]] = icmp sgt i32 [[REM]], 0
11; CHECK-NEXT:    br i1 [[CMP7]], label [[WHILE_BODY:%.*]], label [[WHILE_END:%.*]]
12; CHECK:       while.body:
13; CHECK-NEXT:    [[TMP0:%.*]] = load i32, i32* [[X:%.*]], align 4
14; CHECK-NEXT:    [[CMP1:%.*]] = icmp slt i32 [[TMP0]], 10
15; CHECK-NEXT:    br i1 [[CMP1]], label [[IF_THEN:%.*]], label [[IF_END:%.*]]
16; CHECK:       if.then:
17; CHECK-NEXT:    store i32 0, i32* [[X]], align 4
18; CHECK-NEXT:    br label [[IF_END]]
19; CHECK:       if.end:
20; CHECK-NEXT:    [[INCDEC_PTR:%.*]] = getelementptr inbounds i32, i32* [[X]], i64 1
21; CHECK-NEXT:    [[CMP:%.*]] = icmp sgt i32 [[REM]], 1
22; CHECK-NEXT:    br i1 [[CMP]], label [[WHILE_BODY_1:%.*]], label [[WHILE_END]]
23; CHECK:       while.end:
24; CHECK-NEXT:    ret void
25; CHECK:       while.body.1:
26; CHECK-NEXT:    [[TMP1:%.*]] = load i32, i32* [[INCDEC_PTR]], align 4
27; CHECK-NEXT:    [[CMP1_1:%.*]] = icmp slt i32 [[TMP1]], 10
28; CHECK-NEXT:    br i1 [[CMP1_1]], label [[IF_THEN_1:%.*]], label [[IF_END_1:%.*]]
29; CHECK:       if.then.1:
30; CHECK-NEXT:    store i32 0, i32* [[INCDEC_PTR]], align 4
31; CHECK-NEXT:    br label [[IF_END_1]]
32; CHECK:       if.end.1:
33; CHECK-NEXT:    [[INCDEC_PTR_1:%.*]] = getelementptr inbounds i32, i32* [[X]], i64 2
34; CHECK-NEXT:    [[CMP_1:%.*]] = icmp sgt i32 [[REM]], 2
35; CHECK-NEXT:    br i1 [[CMP_1]], label [[WHILE_BODY_2:%.*]], label [[WHILE_END]]
36; CHECK:       while.body.2:
37; CHECK-NEXT:    [[TMP2:%.*]] = load i32, i32* [[INCDEC_PTR_1]], align 4
38; CHECK-NEXT:    [[CMP1_2:%.*]] = icmp slt i32 [[TMP2]], 10
39; CHECK-NEXT:    br i1 [[CMP1_2]], label [[IF_THEN_2:%.*]], label [[WHILE_END]]
40; CHECK:       if.then.2:
41; CHECK-NEXT:    store i32 0, i32* [[INCDEC_PTR_1]], align 4
42; CHECK-NEXT:    br label [[WHILE_END]]
43;
44entry:
45  %sub = add nsw i32 %n, -1
46  %rem = srem i32 %sub, 4
47  %cmp7 = icmp sgt i32 %rem, 0
48  br i1 %cmp7, label %while.body, label %while.end
49
50while.body:                                       ; preds = %entry, %if.end
51  %x.addr.09 = phi i32* [ %incdec.ptr, %if.end ], [ %x, %entry ]
52  %n.addr.08 = phi i32 [ %dec, %if.end ], [ %rem, %entry ]
53  %0 = load i32, i32* %x.addr.09, align 4
54  %cmp1 = icmp slt i32 %0, 10
55  br i1 %cmp1, label %if.then, label %if.end
56
57if.then:                                          ; preds = %while.body
58  store i32 0, i32* %x.addr.09, align 4
59  br label %if.end
60
61if.end:                                           ; preds = %if.then, %while.body
62  %incdec.ptr = getelementptr inbounds i32, i32* %x.addr.09, i32 1
63  %dec = add nsw i32 %n.addr.08, -1
64  %cmp = icmp sgt i32 %dec, 0
65  br i1 %cmp, label %while.body, label %while.end
66
67while.end:                                        ; preds = %if.end, %entry
68  ret void
69}
70
71; Larger test that is still fully unrolled, thanks in part to the constant data and the max upper bound.
72@data = internal constant [50 x i32] [i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7, i32 8, i32 9, i32 10, i32 11, i32 12, i32 13, i32 14, i32 15, i32 16, i32 17, i32 18, i32 19, i32 20, i32 21, i32 22, i32 23, i32 24, i32 25, i32 26, i32 27, i32 28, i32 29, i32 30, i32 31, i32 32, i32 33, i32 34, i32 35, i32 36, i32 37, i32 38, i32 39, i32 40, i32 41, i32 42, i32 43, i32 44, i32 45, i32 46, i32 47, i32 48, i32 49, i32 50], align 4
73define i32 @test2(i32 %l86) {
74; CHECK-LABEL: @test2(
75; CHECK-NEXT:  entry:
76; CHECK-NEXT:    [[L86_OFF:%.*]] = add i32 [[L86:%.*]], -1
77; CHECK-NEXT:    [[SWITCH:%.*]] = icmp ult i32 [[L86_OFF]], 24
78; CHECK-NEXT:    br i1 [[SWITCH]], label [[FOR_END_I_IF_END8_I_CRIT_EDGE_I:%.*]], label [[FOR_INC_I_3_I_5:%.*]]
79; CHECK:       for.end.i.if.end8.i_crit_edge.i:
80; CHECK-NEXT:    ret i32 0
81; CHECK:       for.inc.i.3.i.5:
82; CHECK-NEXT:    [[DOTNOT30:%.*]] = icmp ne i32 [[L86]], 25
83; CHECK-NEXT:    [[SPEC_SELECT24:%.*]] = zext i1 [[DOTNOT30]] to i32
84; CHECK-NEXT:    ret i32 [[SPEC_SELECT24]]
85;
86entry:
87  br label %for.body.i.i
88
89for.body.i.i:                                     ; preds = %for.body.i.i.preheader, %for.inc.i.3.i
90  %i.0137.i.i = phi i32 [ %add.i.3.i, %for.inc.i.3.i ], [ 0, %entry ]
91  %add.i.i = or i32 %i.0137.i.i, 1
92  %arrayidx.i.i = getelementptr inbounds i32, i32* getelementptr inbounds ([50 x i32], [50 x i32]* @data, i32 0, i32 0), i32 %add.i.i
93  %l93 = load i32, i32* %arrayidx.i.i, align 4
94  %cmp1.i.i = icmp sgt i32 %l93, %l86
95  br i1 %cmp1.i.i, label %land.lhs.true.i.i, label %for.inc.i.i
96
97land.lhs.true.i.i:                                ; preds = %for.body.i.i
98  %arrayidx2.i.i = getelementptr inbounds i32, i32* getelementptr inbounds ([50 x i32], [50 x i32]* @data, i32 0, i32 0), i32 %i.0137.i.i
99  %l94 = load i32, i32* %arrayidx2.i.i, align 4
100  %cmp3.not.i.i = icmp sgt i32 %l94, %l86
101  br i1 %cmp3.not.i.i, label %for.inc.i.i, label %for.end.i.if.end8.i_crit_edge.i.loopexit
102
103for.inc.i.i:                                      ; preds = %land.lhs.true.i.i, %for.body.i.i
104  %exitcond.not.i.i = icmp eq i32 %add.i.i, 25
105  br i1 %exitcond.not.i.i, label %if.then6.i.i.loopexitsplit, label %for.body.i.1.i
106
107for.body.i.1.i:                                   ; preds = %for.inc.i.i
108  %add.i.1.i = or i32 %i.0137.i.i, 2
109  %arrayidx.i.1.i = getelementptr inbounds i32, i32* getelementptr inbounds ([50 x i32], [50 x i32]* @data, i32 0, i32 0), i32 %add.i.1.i
110  %l345 = load i32, i32* %arrayidx.i.1.i, align 4
111  %cmp1.i.1.i = icmp sgt i32 %l345, %l86
112  br i1 %cmp1.i.1.i, label %land.lhs.true.i.1.i, label %for.inc.i.1.i
113
114land.lhs.true.i.1.i:                              ; preds = %for.body.i.1.i
115  br i1 %cmp1.i.i, label %for.inc.i.1.i, label %for.end.i.i
116
117for.inc.i.1.i:                                    ; preds = %land.lhs.true.i.1.i, %for.body.i.1.i
118  %add.i.2.i = or i32 %i.0137.i.i, 3
119  %arrayidx.i.2.i = getelementptr inbounds i32, i32* getelementptr inbounds ([50 x i32], [50 x i32]* @data, i32 0, i32 0), i32 %add.i.2.i
120  %l346 = load i32, i32* %arrayidx.i.2.i, align 4
121  %cmp1.i.2.i = icmp sgt i32 %l346, %l86
122  br i1 %cmp1.i.2.i, label %land.lhs.true.i.2.i, label %for.inc.i.2.i
123
124land.lhs.true.i.2.i:                              ; preds = %for.inc.i.1.i
125  br i1 %cmp1.i.1.i, label %for.inc.i.2.i, label %for.end.i.if.end8.i_crit_edge.i.loopexit
126
127for.inc.i.2.i:                                    ; preds = %land.lhs.true.i.2.i, %for.inc.i.1.i
128  br label %for.body.i.3.i
129
130for.body.i.3.i:                                   ; preds = %for.inc.i.2.i
131  %add.i.3.i = add nuw nsw i32 %i.0137.i.i, 4
132  %arrayidx.i.3.i = getelementptr inbounds i32, i32* getelementptr inbounds ([50 x i32], [50 x i32]* @data, i32 0, i32 0), i32 %add.i.3.i
133  %l347 = load i32, i32* %arrayidx.i.3.i, align 4
134  %cmp1.i.3.i = icmp sgt i32 %l347, %l86
135  br i1 %cmp1.i.3.i, label %land.lhs.true.i.3.i, label %for.inc.i.3.i
136
137land.lhs.true.i.3.i:                              ; preds = %for.body.i.3.i
138  br i1 %cmp1.i.2.i, label %for.inc.i.3.i, label %for.end.i.i
139
140for.inc.i.3.i:                                    ; preds = %land.lhs.true.i.3.i, %for.body.i.3.i
141  br label %for.body.i.i
142
143for.end.i.if.end8.i_crit_edge.i.loopexit:         ; preds = %land.lhs.true.i.i, %land.lhs.true.i.2.i
144  %i.0.lcssa.i.i3.ph = phi i32 [ %i.0137.i.i, %land.lhs.true.i.i ], [ %add.i.1.i, %land.lhs.true.i.2.i ]
145  br label %for.end.i.if.end8.i_crit_edge.i
146
147if.then6.i.i.loopexitsplit:                       ; preds = %for.inc.i.i
148  br label %if.then6.i.i.loopexit
149
150for.end.i.i:                                      ; preds = %land.lhs.true.i.3.i, %land.lhs.true.i.1.i
151  %i.0.lcssa.i.i = phi i32 [ %add.i.i, %land.lhs.true.i.1.i ], [ %add.i.2.i, %land.lhs.true.i.3.i ]
152  %cmp5.i.i = icmp eq i32 %i.0.lcssa.i.i, 25
153  br i1 %cmp5.i.i, label %if.then6.i.i, label %for.end.i.if.end8.i_crit_edge.i
154
155for.end.i.if.end8.i_crit_edge.i:
156  ret i32 0
157
158if.then6.i.i.loopexit:
159  ret i32 1
160
161if.then6.i.i:
162  ret i32 2
163}
164