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 @.str = private unnamed_addr constant [11 x i8] c"sum is %d\0A\00", align 1
21 ; Function Attrs: nounwind uwtable
22 define i32 @_Z3sumii(i32 %x, i32 %y) {
24 %x.addr = alloca i32, align 4
25 %y.addr = alloca i32, align 4
26 store i32 %x, i32* %x.addr, align 4
27 store i32 %y, i32* %y.addr, align 4
28 %0 = load i32* %x.addr, align 4, !dbg !11
29 %1 = load i32* %y.addr, align 4, !dbg !11
30 %add = add nsw i32 %0, %1, !dbg !11
31 ret i32 %add, !dbg !11
34 ; Function Attrs: uwtable
37 %retval = alloca i32, align 4
38 %s = alloca i32, align 4
39 %i = alloca i32, align 4
40 store i32 0, i32* %retval
41 store i32 0, i32* %i, align 4, !dbg !12
42 br label %while.cond, !dbg !13
44 while.cond: ; preds = %if.end, %entry
45 %0 = load i32* %i, align 4, !dbg !14
46 %inc = add nsw i32 %0, 1, !dbg !14
47 store i32 %inc, i32* %i, align 4, !dbg !14
48 %cmp = icmp slt i32 %0, 400000000, !dbg !14
49 br i1 %cmp, label %while.body, label %while.end, !dbg !14
50 ; CHECK: edge while.cond -> while.body probability is 5391 / 5392 = 99.9815% [HOT edge]
51 ; CHECK: edge while.cond -> while.end probability is 1 / 5392 = 0.018546%
53 while.body: ; preds = %while.cond
54 %1 = load i32* %i, align 4, !dbg !16
55 %cmp1 = icmp ne i32 %1, 100, !dbg !16
56 br i1 %cmp1, label %if.then, label %if.else, !dbg !16
57 ; Without discriminator information, the profiler used to think that
58 ; both branches out of while.body had the same weight. In reality,
59 ; the edge while.body->if.then is taken most of the time.
61 ; CHECK: edge while.body -> if.then probability is 5752 / 5753 = 99.9826% [HOT edge]
62 ; CHECK: edge while.body -> if.else probability is 1 / 5753 = 0.0173822%
65 if.then: ; preds = %while.body
66 %2 = load i32* %i, align 4, !dbg !18
67 %3 = load i32* %s, align 4, !dbg !18
68 %call = call i32 @_Z3sumii(i32 %2, i32 %3), !dbg !18
69 store i32 %call, i32* %s, align 4, !dbg !18
70 br label %if.end, !dbg !18
72 if.else: ; preds = %while.body
73 store i32 30, i32* %s, align 4, !dbg !20
76 if.end: ; preds = %if.else, %if.then
77 br label %while.cond, !dbg !22
79 while.end: ; preds = %while.cond
80 %4 = load i32* %s, align 4, !dbg !24
81 %call2 = call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([11 x i8]* @.str, i32 0, i32 0), i32 %4), !dbg !24
85 declare i32 @printf(i8*, ...) #2
88 !llvm.module.flags = !{!8, !9}
91 !0 = metadata !{metadata !"0x11\004\00clang version 3.5 \000\00\000\00\000", metadata !1, metadata !2, metadata !2, metadata !3, metadata !2, metadata !2} ; [ DW_TAG_compile_unit ] [./calls.cc] [DW_LANG_C_plus_plus]
92 !1 = metadata !{metadata !"calls.cc", metadata !"."}
94 !3 = metadata !{metadata !4, metadata !7}
95 !4 = metadata !{metadata !"0x2e\00sum\00sum\00\003\000\001\000\006\00256\000\003", metadata !1, metadata !5, metadata !6, null, i32 (i32, i32)* @_Z3sumii, null, null, metadata !2} ; [ DW_TAG_subprogram ] [line 3] [def] [sum]
96 !5 = metadata !{metadata !"0x29", metadata !1} ; [ DW_TAG_file_type ] [./calls.cc]
97 !6 = metadata !{metadata !"0x15\00\000\000\000\000\000\000", i32 0, null, null, metadata !2, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
98 !7 = metadata !{metadata !"0x2e\00main\00main\00\007\000\001\000\006\00256\000\007", metadata !1, metadata !5, metadata !6, null, i32 ()* @main, null, null, metadata !2} ; [ DW_TAG_subprogram ] [line 7] [def] [main]
99 !8 = metadata !{i32 2, metadata !"Dwarf Version", i32 4}
100 !9 = metadata !{i32 1, metadata !"Debug Info Version", i32 2}
101 !10 = metadata !{metadata !"clang version 3.5 "}
102 !11 = metadata !{i32 4, i32 0, metadata !4, null}
103 !12 = metadata !{i32 8, i32 0, metadata !7, null}
104 !13 = metadata !{i32 9, i32 0, metadata !7, null}
105 !14 = metadata !{i32 9, i32 0, metadata !15, null}
106 !15 = metadata !{metadata !"0xb\001", metadata !1, metadata !7} ; [ DW_TAG_lexical_block ] [./calls.cc]
107 !16 = metadata !{i32 10, i32 0, metadata !17, null}
108 !17 = metadata !{metadata !"0xb\0010\000\000", metadata !1, metadata !7} ; [ DW_TAG_lexical_block ] [./calls.cc]
109 !18 = metadata !{i32 10, i32 0, metadata !19, null}
110 !19 = metadata !{metadata !"0xb\001", metadata !1, metadata !17} ; [ DW_TAG_lexical_block ] [./calls.cc]
111 !20 = metadata !{i32 10, i32 0, metadata !21, null}
112 !21 = metadata !{metadata !"0xb\002", metadata !1, metadata !17} ; [ DW_TAG_lexical_block ] [./calls.cc]
113 !22 = metadata !{i32 10, i32 0, metadata !23, null}
114 !23 = metadata !{metadata !"0xb\003", metadata !1, metadata !17} ; [ DW_TAG_lexical_block ] [./calls.cc]
115 !24 = metadata !{i32 11, i32 0, metadata !7, null}
116 !25 = metadata !{i32 12, i32 0, metadata !7, null}