1 ; RUN: opt < %s -sample-profile -sample-profile-file=%S/Inputs/calls.prof | opt -analyze -branch-prob | FileCheck %s
3 ; Original C++ test case
7 ; int sum(int x, int y) {
13 ; while (i++ < 20000 * 20000)
14 ; if (i != 100) s = sum(i, s); else s = 30;
15 ; printf("sum is %d\n", s);
19 ; Note that this test is missing the llvm.dbg.cu annotation. This emulates
20 ; the effect of the user having only used -fprofile-sample-use without
21 ; -gmlt when invoking the driver. In those cases, we need to track source
22 ; location information but we do not have to generate debug info in the
24 @.str = private unnamed_addr constant [11 x i8] c"sum is %d\0A\00", align 1
26 ; Function Attrs: nounwind uwtable
27 define i32 @_Z3sumii(i32 %x, i32 %y) {
29 %x.addr = alloca i32, align 4
30 %y.addr = alloca i32, align 4
31 store i32 %x, i32* %x.addr, align 4
32 store i32 %y, i32* %y.addr, align 4
33 %0 = load i32* %x.addr, align 4, !dbg !11
34 %1 = load i32* %y.addr, align 4, !dbg !11
35 %add = add nsw i32 %0, %1, !dbg !11
36 ret i32 %add, !dbg !11
39 ; Function Attrs: uwtable
42 %retval = alloca i32, align 4
43 %s = alloca i32, align 4
44 %i = alloca i32, align 4
45 store i32 0, i32* %retval
46 store i32 0, i32* %i, align 4, !dbg !12
47 br label %while.cond, !dbg !13
49 while.cond: ; preds = %if.end, %entry
50 %0 = load i32* %i, align 4, !dbg !14
51 %inc = add nsw i32 %0, 1, !dbg !14
52 store i32 %inc, i32* %i, align 4, !dbg !14
53 %cmp = icmp slt i32 %0, 400000000, !dbg !14
54 br i1 %cmp, label %while.body, label %while.end, !dbg !14
55 ; CHECK: edge while.cond -> while.body probability is 5391 / 5392 = 99.9815% [HOT edge]
56 ; CHECK: edge while.cond -> while.end probability is 1 / 5392 = 0.018546%
58 while.body: ; preds = %while.cond
59 %1 = load i32* %i, align 4, !dbg !16
60 %cmp1 = icmp ne i32 %1, 100, !dbg !16
61 br i1 %cmp1, label %if.then, label %if.else, !dbg !16
62 ; Without discriminator information, the profiler used to think that
63 ; both branches out of while.body had the same weight. In reality,
64 ; the edge while.body->if.then is taken most of the time.
66 ; CHECK: edge while.body -> if.then probability is 5752 / 5753 = 99.9826% [HOT edge]
67 ; CHECK: edge while.body -> if.else probability is 1 / 5753 = 0.0173822%
70 if.then: ; preds = %while.body
71 %2 = load i32* %i, align 4, !dbg !18
72 %3 = load i32* %s, align 4, !dbg !18
73 %call = call i32 @_Z3sumii(i32 %2, i32 %3), !dbg !18
74 store i32 %call, i32* %s, align 4, !dbg !18
75 br label %if.end, !dbg !18
77 if.else: ; preds = %while.body
78 store i32 30, i32* %s, align 4, !dbg !20
81 if.end: ; preds = %if.else, %if.then
82 br label %while.cond, !dbg !22
84 while.end: ; preds = %while.cond
85 %4 = load i32* %s, align 4, !dbg !24
86 %call2 = call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([11 x i8]* @.str, i32 0, i32 0), i32 %4), !dbg !24
90 declare i32 @printf(i8*, ...) #2
92 !llvm.module.flags = !{!8, !9}
95 !0 = !{!"0x11\004\00clang version 3.5 \000\00\000\00\000", !1, !2, !2, !3, !2, !2} ; [ DW_TAG_compile_unit ] [./calls.cc] [DW_LANG_C_plus_plus]
96 !1 = !{!"calls.cc", !"."}
99 !4 = !{!"0x2e\00sum\00sum\00\003\000\001\000\006\00256\000\003", !1, !5, !6, null, i32 (i32, i32)* @_Z3sumii, null, null, !2} ; [ DW_TAG_subprogram ] [line 3] [def] [sum]
100 !5 = !{!"0x29", !1} ; [ DW_TAG_file_type ] [./calls.cc]
101 !6 = !{!"0x15\00\000\000\000\000\000\000", i32 0, null, null, !2, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
102 !7 = !{!"0x2e\00main\00main\00\007\000\001\000\006\00256\000\007", !1, !5, !6, null, i32 ()* @main, null, null, !2} ; [ DW_TAG_subprogram ] [line 7] [def] [main]
103 !8 = !{i32 2, !"Dwarf Version", i32 4}
104 !9 = !{i32 1, !"Debug Info Version", i32 2}
105 !10 = !{!"clang version 3.5 "}
106 !11 = !MDLocation(line: 4, scope: !4)
107 !12 = !MDLocation(line: 8, scope: !7)
108 !13 = !MDLocation(line: 9, scope: !7)
109 !14 = !MDLocation(line: 9, scope: !15)
110 !15 = !{!"0xb\001", !1, !7} ; [ DW_TAG_lexical_block ] [./calls.cc]
111 !16 = !MDLocation(line: 10, scope: !17)
112 !17 = !{!"0xb\0010\000\000", !1, !7} ; [ DW_TAG_lexical_block ] [./calls.cc]
113 !18 = !MDLocation(line: 10, scope: !19)
114 !19 = !{!"0xb\001", !1, !17} ; [ DW_TAG_lexical_block ] [./calls.cc]
115 !20 = !MDLocation(line: 10, scope: !21)
116 !21 = !{!"0xb\002", !1, !17} ; [ DW_TAG_lexical_block ] [./calls.cc]
117 !22 = !MDLocation(line: 10, scope: !23)
118 !23 = !{!"0xb\003", !1, !17} ; [ DW_TAG_lexical_block ] [./calls.cc]
119 !24 = !MDLocation(line: 11, scope: !7)
120 !25 = !MDLocation(line: 12, scope: !7)