source: icGREP/icgrep-devel/llvm-3.8.0.src/test/CodeGen/Hexagon/hwloop1.ll @ 5027

Last change on this file since 5027 was 5027, checked in by cameron, 3 years ago

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Line 
1; RUN: llc -march=hexagon < %s | FileCheck %s
2; Check that we generate hardware loop instructions.
3
4; Case 1 : Loop with a constant number of iterations.
5; CHECK-LABEL: @hwloop1
6; CHECK: loop0(.LBB{{.}}_{{.}}, #10)
7; CHECK: endloop0
8
9@a = common global [10 x i32] zeroinitializer, align 4
10define i32 @hwloop1() nounwind {
11entry:
12  br label %for.body
13for.body:
14  %i.01 = phi i32 [ 0, %entry ], [ %inc, %for.body ]
15  %arrayidx = getelementptr inbounds [10 x i32], [10 x i32]* @a, i32 0, i32 %i.01
16  store i32 %i.01, i32* %arrayidx, align 4
17  %inc = add nsw i32 %i.01, 1
18  %exitcond = icmp eq i32 %inc, 10
19  br i1 %exitcond, label %for.end, label %for.body
20for.end:
21  ret i32 0
22}
23
24; Case 2 : Loop with a run-time number of iterations.
25; CHECK-LABEL: @hwloop2
26; CHECK: loop0(.LBB{{.}}_{{.}}, r{{[0-9]+}})
27; CHECK: endloop0
28
29define i32 @hwloop2(i32 %n, i32* nocapture %b) nounwind {
30entry:
31  %cmp1 = icmp sgt i32 %n, 0
32  br i1 %cmp1, label %for.body.preheader, label %for.end
33
34for.body.preheader:
35  br label %for.body
36
37for.body:
38  %a.03 = phi i32 [ %add, %for.body ], [ 0, %for.body.preheader ]
39  %i.02 = phi i32 [ %inc, %for.body ], [ 0, %for.body.preheader ]
40  %arrayidx = getelementptr inbounds i32, i32* %b, i32 %i.02
41  %0 = load i32, i32* %arrayidx, align 4
42  %add = add nsw i32 %0, %a.03
43  %inc = add nsw i32 %i.02, 1
44  %exitcond = icmp eq i32 %inc, %n
45  br i1 %exitcond, label %for.end.loopexit, label %for.body
46
47for.end.loopexit:
48  br label %for.end
49
50for.end:
51  %a.0.lcssa = phi i32 [ 0, %entry ], [ %add, %for.end.loopexit ]
52  ret i32 %a.0.lcssa
53}
54
55; Case 3 : Induction variable increment more than 1.
56; CHECK-LABEL: @hwloop3
57; CHECK: lsr(r{{[0-9]+}}, #2)
58; CHECK: loop0(.LBB{{.}}_{{.}}, r{{[0-9]+}})
59; CHECK: endloop0
60
61define i32 @hwloop3(i32 %n, i32* nocapture %b) nounwind {
62entry:
63  %cmp1 = icmp sgt i32 %n, 0
64  br i1 %cmp1, label %for.body.preheader, label %for.end
65
66for.body.preheader:
67  br label %for.body
68
69for.body:
70  %a.03 = phi i32 [ %add, %for.body ], [ 0, %for.body.preheader ]
71  %i.02 = phi i32 [ %inc, %for.body ], [ 0, %for.body.preheader ]
72  %arrayidx = getelementptr inbounds i32, i32* %b, i32 %i.02
73  %0 = load i32, i32* %arrayidx, align 4
74  %add = add nsw i32 %0, %a.03
75  %inc = add nsw i32 %i.02, 4
76  %exitcond = icmp eq i32 %inc, %n
77  br i1 %exitcond, label %for.end.loopexit, label %for.body
78
79for.end.loopexit:
80  br label %for.end
81
82for.end:
83  %a.0.lcssa = phi i32 [ 0, %entry ], [ %add, %for.end.loopexit ]
84  ret i32 %a.0.lcssa
85}
86
87; Case 4 : Loop exit compare uses register instead of immediate value.
88; CHECK-LABEL: @hwloop4
89; CHECK: loop0(.LBB{{.}}_{{.}}, r{{[0-9]+}})
90; CHECK: endloop0
91
92define i32 @hwloop4(i32 %n, i32* nocapture %b) nounwind {
93entry:
94  %cmp1 = icmp sgt i32 %n, 0
95  br i1 %cmp1, label %for.body.preheader, label %for.end
96
97for.body.preheader:
98  br label %for.body
99
100for.body:
101  %i.02 = phi i32 [ %inc, %for.body ], [ 0, %for.body.preheader ]
102  %arrayidx = getelementptr inbounds i32, i32* %b, i32 %i.02
103  store i32 %i.02, i32* %arrayidx, align 4
104  %inc = add nsw i32 %i.02, 1
105  %exitcond = icmp eq i32 %inc, %n
106  br i1 %exitcond, label %for.end.loopexit, label %for.body
107
108for.end.loopexit:
109  br label %for.end
110
111for.end:
112  ret i32 0
113}
114
115; Case 5: After LSR, the initial value is 100 and the iv decrements to 0.
116; CHECK-LABEL: @hwloop5
117; CHECK: loop0(.LBB{{.}}_{{.}}, #100)
118; CHECK: endloop0
119
120define void @hwloop5(i32* nocapture %a, i32* nocapture %res) nounwind {
121entry:
122  br label %for.body
123
124for.body:
125  %i.03 = phi i32 [ 0, %entry ], [ %inc, %for.body ]
126  %arrayidx = getelementptr inbounds i32, i32* %a, i32 %i.03
127  %0 = load i32, i32* %arrayidx, align 4
128  %mul = mul nsw i32 %0, %0
129  %arrayidx2 = getelementptr inbounds i32, i32* %res, i32 %i.03
130  store i32 %mul, i32* %arrayidx2, align 4
131  %inc = add nsw i32 %i.03, 1
132  %exitcond = icmp eq i32 %inc, 100
133  br i1 %exitcond, label %for.end, label %for.body
134
135for.end:
136  ret void
137}
138
139; Case 6: Large immediate offset
140; CHECK-LABEL: @hwloop6
141; CHECK-NOT: loop0(.LBB{{.}}_{{.}}, #1024)
142; CHECK: loop0(.LBB{{.}}_{{.}}, r{{[0-9]+}})
143; CHECK: endloop0
144
145define void @hwloop6(i32* nocapture %a, i32* nocapture %res) nounwind {
146entry:
147  br label %for.body
148
149for.body:
150  %i.02 = phi i32 [ 0, %entry ], [ %inc, %for.body ]
151  %arrayidx = getelementptr inbounds i32, i32* %a, i32 %i.02
152  %0 = load i32, i32* %arrayidx, align 4
153  %arrayidx1 = getelementptr inbounds i32, i32* %res, i32 %i.02
154  store i32 %0, i32* %arrayidx1, align 4
155  %inc = add nsw i32 %i.02, 1
156  %exitcond = icmp eq i32 %inc, 1024
157  br i1 %exitcond, label %for.end, label %for.body
158
159for.end:
160  ret void
161}
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