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1; RUN: opt -O2 -mtriple=bpf-pc-linux %s | llvm-dis > %t1
2; RUN: llc %t1 -o - | FileCheck -check-prefixes=CHECK %s
3; RUN: opt -O2 -mtriple=bpf-pc-linux -bpf-disable-serialize-icmp %s | llvm-dis > %t1
4; RUN: llc %t1 -o - | FileCheck -check-prefixes=CHECK-DISABLE %s
5;
6; Source:
7;   int foo();
8;   int bar(int);
9;   int test() {
10;     int ret = foo();
11;     if (ret <= 0)
12;       return 0;
13;     if (ret > 7)
14;       return 0;
15;     return bar(ret);
16;   }
17; Compilation flag:
18;   clang -target bpf -O2 -S -emit-llvm -Xclang -disable-llvm-passes test.c
19
20; Function Attrs: nounwind
21define dso_local i32 @test() #0 {
22entry:
23  %retval = alloca i32, align 4
24  %ret = alloca i32, align 4
25  %cleanup.dest.slot = alloca i32, align 4
26  %0 = bitcast i32* %ret to i8*
27  call void @llvm.lifetime.start.p0i8(i64 4, i8* %0) #3
28  %call = call i32 bitcast (i32 (...)* @foo to i32 ()*)()
29  store i32 %call, i32* %ret, align 4, !tbaa !2
30  %1 = load i32, i32* %ret, align 4, !tbaa !2
31  %cmp = icmp sle i32 %1, 0
32  br i1 %cmp, label %if.then, label %if.end
33
34; CHECK:         [[REG1:r[0-9]+]] <<= 32
35; CHECK:         [[REG1]] s>>= 32
36; CHECK:         [[REG2:r[0-9]+]] = 1
37; CHECK:         if [[REG2]] s> [[REG1]] goto
38; CHECK:         if [[REG1]] s> 7 goto
39
40; CHECK-DISABLE: [[REG1:r[0-9]+]] += -1
41; CHECK-DISABLE: [[REG1]] <<= 32
42; CHECK-DISABLE: [[REG1]] >>= 32
43; CHECK-DISABLE: if [[REG1]] > 6 goto
44
45if.then:                                          ; preds = %entry
46  store i32 0, i32* %retval, align 4
47  store i32 1, i32* %cleanup.dest.slot, align 4
48  br label %cleanup
49
50if.end:                                           ; preds = %entry
51  %2 = load i32, i32* %ret, align 4, !tbaa !2
52  %cmp1 = icmp sgt i32 %2, 7
53  br i1 %cmp1, label %if.then2, label %if.end3
54
55if.then2:                                         ; preds = %if.end
56  store i32 0, i32* %retval, align 4
57  store i32 1, i32* %cleanup.dest.slot, align 4
58  br label %cleanup
59
60if.end3:                                          ; preds = %if.end
61  %3 = load i32, i32* %ret, align 4, !tbaa !2
62  %call4 = call i32 @bar(i32 %3)
63  store i32 %call4, i32* %retval, align 4
64  store i32 1, i32* %cleanup.dest.slot, align 4
65  br label %cleanup
66
67cleanup:                                          ; preds = %if.end3, %if.then2, %if.then
68  %4 = bitcast i32* %ret to i8*
69  call void @llvm.lifetime.end.p0i8(i64 4, i8* %4) #3
70  %5 = load i32, i32* %retval, align 4
71  ret i32 %5
72}
73
74; Function Attrs: argmemonly nounwind willreturn
75declare void @llvm.lifetime.start.p0i8(i64 immarg, i8* nocapture) #1
76
77declare dso_local i32 @foo(...) #2
78
79declare dso_local i32 @bar(i32) #2
80
81; Function Attrs: argmemonly nounwind willreturn
82declare void @llvm.lifetime.end.p0i8(i64 immarg, i8* nocapture) #1
83
84attributes #0 = { nounwind "disable-tail-calls"="false" "frame-pointer"="all" "less-precise-fpmad"="false" "min-legal-vector-width"="0" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
85attributes #1 = { argmemonly nounwind willreturn }
86attributes #2 = { "disable-tail-calls"="false" "frame-pointer"="all" "less-precise-fpmad"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
87attributes #3 = { nounwind }
88
89!llvm.module.flags = !{!0}
90!llvm.ident = !{!1}
91
92!0 = !{i32 1, !"wchar_size", i32 4}
93!1 = !{!"clang version 12.0.0 (https://github.com/llvm/llvm-project.git ca9c5433a6c31e372092fcd8bfd0e4fddd7e8784)"}
94!2 = !{!3, !3, i64 0}
95!3 = !{!"int", !4, i64 0}
96!4 = !{!"omnipotent char", !5, i64 0}
97!5 = !{!"Simple C/C++ TBAA"}
98