1 ; RUN: opt < %s -passes='print<block-freq>' -disable-output 2>&1 | FileCheck %s
3 ; This code contains three loops. One is triple-nested, the
4 ; second is double nested and the third is a single loop. At
5 ; runtime, all three loops execute 1,000,000 times each. We use to
6 ; give different frequencies to each of the loops because loop
7 ; scales were limited to no more than 4,096.
9 ; This was penalizing the hotness of the second and third loops
10 ; because BFI was reducing the loop scale for for.cond16 and
11 ; for.cond26 to a max of 4,096.
13 ; Without this restriction, all loops are now correctly given the same
20 ; __attribute__((noinline)) void bar() {
24 ; extern int printf(const char*, ...);
31 ; for (i = 0; i < 100; i++)
32 ; for (j = 0; j < 100; j++)
33 ; for (k = 0; k < 100; k++)
36 ; printf ("g = %d\n", g);
39 ; for (i = 0; i < 100; i++)
40 ; for (j = 0; j < 10000; j++)
43 ; printf ("g = %d\n", g);
47 ; for (i = 0; i < 1000000; i++)
50 ; printf ("g = %d\n", g);
54 @g = common global i32 0, align 4
55 @.str = private unnamed_addr constant [8 x i8] c"g = %d\0A\00", align 1
58 declare i32 @printf(i8*, ...)
60 ; CHECK: Printing analysis {{.*}} for function 'main':
61 ; CHECK-NEXT: block-frequency-info: main
62 define i32 @main() !prof !6 {
64 %retval = alloca i32, align 4
65 %i = alloca i32, align 4
66 %j = alloca i32, align 4
67 %k = alloca i32, align 4
68 store i32 0, i32* %retval
69 store i32 0, i32* @g, align 4
70 store i32 0, i32* %i, align 4
73 for.cond: ; preds = %for.inc10, %entry
74 %0 = load i32, i32* %i, align 4
75 %cmp = icmp slt i32 %0, 100
76 br i1 %cmp, label %for.body, label %for.end12, !prof !1
78 for.body: ; preds = %for.cond
79 store i32 0, i32* %j, align 4
82 for.cond1: ; preds = %for.inc7, %for.body
83 %1 = load i32, i32* %j, align 4
84 %cmp2 = icmp slt i32 %1, 100
85 br i1 %cmp2, label %for.body3, label %for.end9, !prof !2
87 for.body3: ; preds = %for.cond1
88 store i32 0, i32* %k, align 4
91 for.cond4: ; preds = %for.inc, %for.body3
92 %2 = load i32, i32* %k, align 4
93 %cmp5 = icmp slt i32 %2, 100
94 br i1 %cmp5, label %for.body6, label %for.end, !prof !3
96 ; CHECK: - for.body6: float = 1000000.0,{{.*}}count = 1000000
97 for.body6: ; preds = %for.cond4
101 for.inc: ; preds = %for.body6
102 %3 = load i32, i32* %k, align 4
103 %inc = add nsw i32 %3, 1
104 store i32 %inc, i32* %k, align 4
107 for.end: ; preds = %for.cond4
110 for.inc7: ; preds = %for.end
111 %4 = load i32, i32* %j, align 4
112 %inc8 = add nsw i32 %4, 1
113 store i32 %inc8, i32* %j, align 4
116 for.end9: ; preds = %for.cond1
119 for.inc10: ; preds = %for.end9
120 %5 = load i32, i32* %i, align 4
121 %inc11 = add nsw i32 %5, 1
122 store i32 %inc11, i32* %i, align 4
125 for.end12: ; preds = %for.cond
126 %6 = load i32, i32* @g, align 4
127 %call = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str, i32 0, i32 0), i32 %6)
128 store i32 0, i32* @g, align 4
129 store i32 0, i32* %i, align 4
132 for.cond13: ; preds = %for.inc22, %for.end12
133 %7 = load i32, i32* %i, align 4
134 %cmp14 = icmp slt i32 %7, 100
135 br i1 %cmp14, label %for.body15, label %for.end24, !prof !1
137 for.body15: ; preds = %for.cond13
138 store i32 0, i32* %j, align 4
141 for.cond16: ; preds = %for.inc19, %for.body15
142 %8 = load i32, i32* %j, align 4
143 %cmp17 = icmp slt i32 %8, 10000
144 br i1 %cmp17, label %for.body18, label %for.end21, !prof !4
146 ; CHECK: - for.body18: float = 999999.5,{{.*}}count = 1000000
147 for.body18: ; preds = %for.cond16
151 for.inc19: ; preds = %for.body18
152 %9 = load i32, i32* %j, align 4
153 %inc20 = add nsw i32 %9, 1
154 store i32 %inc20, i32* %j, align 4
157 for.end21: ; preds = %for.cond16
160 for.inc22: ; preds = %for.end21
161 %10 = load i32, i32* %i, align 4
162 %inc23 = add nsw i32 %10, 1
163 store i32 %inc23, i32* %i, align 4
166 for.end24: ; preds = %for.cond13
167 %11 = load i32, i32* @g, align 4
168 %call25 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str, i32 0, i32 0), i32 %11)
169 store i32 0, i32* @g, align 4
170 store i32 0, i32* %i, align 4
173 for.cond26: ; preds = %for.inc29, %for.end24
174 %12 = load i32, i32* %i, align 4
175 %cmp27 = icmp slt i32 %12, 1000000
176 br i1 %cmp27, label %for.body28, label %for.end31, !prof !5
178 ; CHECK: - for.body28: float = 1000224.3,{{.*}}count = 1000224
179 for.body28: ; preds = %for.cond26
183 for.inc29: ; preds = %for.body28
184 %13 = load i32, i32* %i, align 4
185 %inc30 = add nsw i32 %13, 1
186 store i32 %inc30, i32* %i, align 4
189 for.end31: ; preds = %for.cond26
190 %14 = load i32, i32* @g, align 4
191 %call32 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str, i32 0, i32 0), i32 %14)
192 store i32 0, i32* @g, align 4
193 %15 = load i32, i32* %retval
199 !0 = !{!"clang version 3.7.0 (trunk 232635) (llvm/trunk 232636)"}
200 !1 = !{!"branch_weights", i32 100, i32 1}
201 !2 = !{!"branch_weights", i32 10000, i32 100}
202 !3 = !{!"branch_weights", i32 1000000, i32 10000}
203 !4 = !{!"branch_weights", i32 1000000, i32 100}
204 !5 = !{!"branch_weights", i32 1000000, i32 1}
205 !6 = !{!"function_entry_count", i32 1}