1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
|
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 3
; RUN: opt -O2 -S < %s | FileCheck %s
;
; Source code:
; typedef unsigned long u64;
; void foo(char *data, int idx, u64 *);
; int test(int len, char *data) {
; if (len < 100) {
; for (int i = 1; i < len; i++) {
; u64 d[1];
; d[0] = data[0] ?: '0';
; foo("%c", i, d);
; }
; }
; return 0;
; }
; Compilation flag:
; clang -target bpf -O2 -S -emit-llvm -Xclang -disable-llvm-passes test.c
; ModuleID = 'test.c'
source_filename = "test.c"
target datalayout = "e-m:e-p:64:64-i64:64-i128:128-n32:64-S128"
target triple = "bpf"
@.str = private unnamed_addr constant [3 x i8] c"%c\00", align 1
; Function Attrs: nounwind
define dso_local i32 @test(i32 %len, ptr %data) #0 {
; CHECK-LABEL: define dso_local noundef i32 @test(
; CHECK-SAME: i32 [[LEN:%.*]], ptr readonly captures(none) [[DATA:%.*]]) local_unnamed_addr #[[ATTR0:[0-9]+]] {
; CHECK-NEXT: entry:
; CHECK-NEXT: [[D:%.*]] = alloca [1 x i64], align 8
; CHECK-NEXT: [[TMP0:%.*]] = add i32 [[LEN]], -2
; CHECK-NEXT: [[OR_COND:%.*]] = icmp ult i32 [[TMP0]], 98
; CHECK-NEXT: br i1 [[OR_COND]], label [[FOR_BODY:%.*]], label [[IF_END:%.*]]
; CHECK: for.body:
; CHECK-NEXT: [[I_05:%.*]] = phi i32 [ [[INC:%.*]], [[FOR_BODY]] ], [ 1, [[ENTRY:%.*]] ]
; CHECK-NEXT: call void @llvm.lifetime.start.p0(ptr nonnull [[D]]) #[[ATTR3:[0-9]+]]
; CHECK-NEXT: [[TMP1:%.*]] = load i8, ptr [[DATA]], align 1, !tbaa [[TBAA3:![0-9]+]]
; CHECK-NEXT: [[TOBOOL_NOT:%.*]] = icmp eq i8 [[TMP1]], 0
; CHECK-NEXT: [[NARROW:%.*]] = select i1 [[TOBOOL_NOT]], i8 48, i8 [[TMP1]]
; CHECK-NEXT: [[CONV2:%.*]] = sext i8 [[NARROW]] to i64
; CHECK-NEXT: store i64 [[CONV2]], ptr [[D]], align 8, !tbaa [[TBAA6:![0-9]+]]
; CHECK-NEXT: call void @foo(ptr nonnull @.str, i32 [[I_05]], ptr nonnull [[D]]) #[[ATTR3]]
; CHECK-NEXT: call void @llvm.lifetime.end.p0(ptr nonnull [[D]]) #[[ATTR3]]
; CHECK-NEXT: [[INC]] = add nuw nsw i32 [[I_05]], 1
; CHECK-NEXT: [[EXITCOND_NOT:%.*]] = icmp eq i32 [[INC]], [[LEN]]
; CHECK-NEXT: br i1 [[EXITCOND_NOT]], label [[IF_END]], label [[FOR_BODY]], !llvm.loop [[LOOP8:![0-9]+]]
; CHECK: if.end:
; CHECK-NEXT: ret i32 0
;
entry:
%len.addr = alloca i32, align 4
%data.addr = alloca ptr, align 8
%i = alloca i32, align 4
%d = alloca [1 x i64], align 8
store i32 %len, ptr %len.addr, align 4, !tbaa !3
store ptr %data, ptr %data.addr, align 8, !tbaa !7
%0 = load i32, ptr %len.addr, align 4, !tbaa !3
%cmp = icmp slt i32 %0, 100
br i1 %cmp, label %if.then, label %if.end
if.then: ; preds = %entry
call void @llvm.lifetime.start.p0(ptr %i) #3
store i32 1, ptr %i, align 4, !tbaa !3
br label %for.cond
for.cond: ; preds = %for.inc, %if.then
%1 = load i32, ptr %i, align 4, !tbaa !3
%2 = load i32, ptr %len.addr, align 4, !tbaa !3
%cmp1 = icmp slt i32 %1, %2
br i1 %cmp1, label %for.body, label %for.cond.cleanup
for.cond.cleanup: ; preds = %for.cond
call void @llvm.lifetime.end.p0(ptr %i) #3
br label %for.end
for.body: ; preds = %for.cond
call void @llvm.lifetime.start.p0(ptr %d) #3
%3 = load ptr, ptr %data.addr, align 8, !tbaa !7
%4 = load i8, ptr %3, align 1, !tbaa !9
%conv = sext i8 %4 to i32
%tobool = icmp ne i32 %conv, 0
br i1 %tobool, label %cond.true, label %cond.false
cond.true: ; preds = %for.body
br label %cond.end
cond.false: ; preds = %for.body
br label %cond.end
cond.end: ; preds = %cond.false, %cond.true
%cond = phi i32 [ %conv, %cond.true ], [ 48, %cond.false ]
%conv2 = sext i32 %cond to i64
store i64 %conv2, ptr %d, align 8, !tbaa !10
%5 = load i32, ptr %i, align 4, !tbaa !3
call void @foo(ptr @.str, i32 %5, ptr %d)
call void @llvm.lifetime.end.p0(ptr %d) #3
br label %for.inc
for.inc: ; preds = %cond.end
%6 = load i32, ptr %i, align 4, !tbaa !3
%inc = add nsw i32 %6, 1
store i32 %inc, ptr %i, align 4, !tbaa !3
br label %for.cond, !llvm.loop !12
for.end: ; preds = %for.cond.cleanup
br label %if.end
if.end: ; preds = %for.end, %entry
ret i32 0
}
; Function Attrs: argmemonly nofree nosync nounwind willreturn
declare void @llvm.lifetime.start.p0(ptr nocapture) #1
declare dso_local void @foo(ptr, i32, ptr) #2
; Function Attrs: argmemonly nofree nosync nounwind willreturn
declare void @llvm.lifetime.end.p0(ptr nocapture) #1
attributes #0 = { nounwind "frame-pointer"="all" "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" }
attributes #1 = { argmemonly nofree nosync nounwind willreturn }
attributes #2 = { "frame-pointer"="all" "no-trapping-math"="true" "stack-protector-buffer-size"="8" }
attributes #3 = { nounwind }
!llvm.module.flags = !{!0, !1}
!llvm.ident = !{!2}
!0 = !{i32 1, !"wchar_size", i32 4}
!1 = !{i32 7, !"frame-pointer", i32 2}
!2 = !{!"clang version 14.0.0 (https://github.com/llvm/llvm-project.git 8385de118443144518c9fba8b3d831d9076e746b)"}
!3 = !{!4, !4, i64 0}
!4 = !{!"int", !5, i64 0}
!5 = !{!"omnipotent char", !6, i64 0}
!6 = !{!"Simple C/C++ TBAA"}
!7 = !{!8, !8, i64 0}
!8 = !{!"any pointer", !5, i64 0}
!9 = !{!5, !5, i64 0}
!10 = !{!11, !11, i64 0}
!11 = !{!"long", !5, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}
|
