1; RUN: opt -O2 -S -o %t1 < %s
2; RUN: llc -march=bpf -mcpu=v3 %t1 -o - | FileCheck %s
3;
4; Source code:
5;   typedef unsigned long u64;
6;   void foo(char *data, int idx, u64 *);
7;   int test(int len, char *data) {
8;     if (len < 100) {
9;       for (int i = 1; i < len; i++) {
10;         u64 d[1];
11;         d[0] = data[0] ?: '0';
12;         foo("%c", i, d);
13;       }
14;     }
15;   return 0;
16; }
17; Compilation flag:
18;   clang -target bpf -O2 -S -emit-llvm -Xclang -disable-llvm-passes test.c
19
20; ModuleID = 'test.c'
21source_filename = "test.c"
22target datalayout = "e-m:e-p:64:64-i64:64-i128:128-n32:64-S128"
23target triple = "bpf"
24
25@.str = private unnamed_addr constant [3 x i8] c"%c\00", align 1
26
27; Function Attrs: nounwind
28define dso_local i32 @test(i32 %len, i8* %data) #0 {
29entry:
30  %len.addr = alloca i32, align 4
31  %data.addr = alloca i8*, align 8
32  %i = alloca i32, align 4
33  %d = alloca [1 x i64], align 8
34  store i32 %len, i32* %len.addr, align 4, !tbaa !3
35  store i8* %data, i8** %data.addr, align 8, !tbaa !7
36  %0 = load i32, i32* %len.addr, align 4, !tbaa !3
37  %cmp = icmp slt i32 %0, 100
38  br i1 %cmp, label %if.then, label %if.end
39
40if.then:                                          ; preds = %entry
41  %1 = bitcast i32* %i to i8*
42  call void @llvm.lifetime.start.p0i8(i64 4, i8* %1) #3
43  store i32 1, i32* %i, align 4, !tbaa !3
44  br label %for.cond
45
46for.cond:                                         ; preds = %for.inc, %if.then
47  %2 = load i32, i32* %i, align 4, !tbaa !3
48  %3 = load i32, i32* %len.addr, align 4, !tbaa !3
49  %cmp1 = icmp slt i32 %2, %3
50  br i1 %cmp1, label %for.body, label %for.cond.cleanup
51
52; CHECK:      w[[LEN:[0-9]+]] = w1
53; CHECK:      w[[IDX:[0-9]+]] += 1
54; CHECK-NEXT: w[[IDX]] s< w[[LEN]] goto
55
56for.cond.cleanup:                                 ; preds = %for.cond
57  %4 = bitcast i32* %i to i8*
58  call void @llvm.lifetime.end.p0i8(i64 4, i8* %4) #3
59  br label %for.end
60
61for.body:                                         ; preds = %for.cond
62  %5 = bitcast [1 x i64]* %d to i8*
63  call void @llvm.lifetime.start.p0i8(i64 8, i8* %5) #3
64  %6 = load i8*, i8** %data.addr, align 8, !tbaa !7
65  %arrayidx = getelementptr inbounds i8, i8* %6, i64 0
66  %7 = load i8, i8* %arrayidx, align 1, !tbaa !9
67  %conv = sext i8 %7 to i32
68  %tobool = icmp ne i32 %conv, 0
69  br i1 %tobool, label %cond.true, label %cond.false
70
71cond.true:                                        ; preds = %for.body
72  br label %cond.end
73
74cond.false:                                       ; preds = %for.body
75  br label %cond.end
76
77cond.end:                                         ; preds = %cond.false, %cond.true
78  %cond = phi i32 [ %conv, %cond.true ], [ 48, %cond.false ]
79  %conv2 = sext i32 %cond to i64
80  %arrayidx3 = getelementptr inbounds [1 x i64], [1 x i64]* %d, i64 0, i64 0
81  store i64 %conv2, i64* %arrayidx3, align 8, !tbaa !10
82  %8 = load i32, i32* %i, align 4, !tbaa !3
83  %arraydecay = getelementptr inbounds [1 x i64], [1 x i64]* %d, i64 0, i64 0
84  call void @foo(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i32 %8, i64* %arraydecay)
85  %9 = bitcast [1 x i64]* %d to i8*
86  call void @llvm.lifetime.end.p0i8(i64 8, i8* %9) #3
87  br label %for.inc
88
89for.inc:                                          ; preds = %cond.end
90  %10 = load i32, i32* %i, align 4, !tbaa !3
91  %inc = add nsw i32 %10, 1
92  store i32 %inc, i32* %i, align 4, !tbaa !3
93  br label %for.cond, !llvm.loop !12
94
95for.end:                                          ; preds = %for.cond.cleanup
96  br label %if.end
97
98if.end:                                           ; preds = %for.end, %entry
99  ret i32 0
100}
101
102; Function Attrs: argmemonly nofree nosync nounwind willreturn
103declare void @llvm.lifetime.start.p0i8(i64 immarg, i8* nocapture) #1
104
105declare dso_local void @foo(i8*, i32, i64*) #2
106
107; Function Attrs: argmemonly nofree nosync nounwind willreturn
108declare void @llvm.lifetime.end.p0i8(i64 immarg, i8* nocapture) #1
109
110attributes #0 = { nounwind "frame-pointer"="all" "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" }
111attributes #1 = { argmemonly nofree nosync nounwind willreturn }
112attributes #2 = { "frame-pointer"="all" "no-trapping-math"="true" "stack-protector-buffer-size"="8" }
113attributes #3 = { nounwind }
114
115!llvm.module.flags = !{!0, !1}
116!llvm.ident = !{!2}
117
118!0 = !{i32 1, !"wchar_size", i32 4}
119!1 = !{i32 7, !"frame-pointer", i32 2}
120!2 = !{!"clang version 14.0.0 (https://github.com/llvm/llvm-project.git 8385de118443144518c9fba8b3d831d9076e746b)"}
121!3 = !{!4, !4, i64 0}
122!4 = !{!"int", !5, i64 0}
123!5 = !{!"omnipotent char", !6, i64 0}
124!6 = !{!"Simple C/C++ TBAA"}
125!7 = !{!8, !8, i64 0}
126!8 = !{!"any pointer", !5, i64 0}
127!9 = !{!5, !5, i64 0}
128!10 = !{!11, !11, i64 0}
129!11 = !{!"long", !5, i64 0}
130!12 = distinct !{!12, !13}
131!13 = !{!"llvm.loop.mustprogress"}
132