1 ; RUN: opt < %s -analyze -block-freq | FileCheck %s 2 3 define i32 @test1(i32 %i, i32* %a) { 4 ; CHECK-LABEL: Printing analysis {{.*}} for function 'test1': 5 ; CHECK-NEXT: block-frequency-info: test1 6 ; CHECK-NEXT: entry: float = 1.0, int = [[ENTRY:[0-9]+]] 7 entry: 8 br label %body 9 10 ; Loop backedges are weighted and thus their bodies have a greater frequency. 11 ; CHECK-NEXT: body: float = 32.0, 12 body: 13 %iv = phi i32 [ 0, %entry ], [ %next, %body ] 14 %base = phi i32 [ 0, %entry ], [ %sum, %body ] 15 %arrayidx = getelementptr inbounds i32, i32* %a, i32 %iv 16 %0 = load i32, i32* %arrayidx 17 %sum = add nsw i32 %0, %base 18 %next = add i32 %iv, 1 19 %exitcond = icmp eq i32 %next, %i 20 br i1 %exitcond, label %exit, label %body 21 22 ; CHECK-NEXT: exit: float = 1.0, int = [[ENTRY]] 23 exit: 24 ret i32 %sum 25 } 26 27 define i32 @test2(i32 %i, i32 %a, i32 %b) { 28 ; CHECK-LABEL: Printing analysis {{.*}} for function 'test2': 29 ; CHECK-NEXT: block-frequency-info: test2 30 ; CHECK-NEXT: entry: float = 1.0, int = [[ENTRY:[0-9]+]] 31 entry: 32 %cond = icmp ult i32 %i, 42 33 br i1 %cond, label %then, label %else, !prof !0 34 35 ; The 'then' branch is predicted more likely via branch weight metadata. 36 ; CHECK-NEXT: then: float = 0.9411{{[0-9]*}}, 37 then: 38 br label %exit 39 40 ; CHECK-NEXT: else: float = 0.05882{{[0-9]*}}, 41 else: 42 br label %exit 43 44 ; CHECK-NEXT: exit: float = 1.0, int = [[ENTRY]] 45 exit: 46 %result = phi i32 [ %a, %then ], [ %b, %else ] 47 ret i32 %result 48 } 49 50 !0 = !{!"branch_weights", i32 64, i32 4} 51 52 define i32 @test3(i32 %i, i32 %a, i32 %b, i32 %c, i32 %d, i32 %e) { 53 ; CHECK-LABEL: Printing analysis {{.*}} for function 'test3': 54 ; CHECK-NEXT: block-frequency-info: test3 55 ; CHECK-NEXT: entry: float = 1.0, int = [[ENTRY:[0-9]+]] 56 entry: 57 switch i32 %i, label %case_a [ i32 1, label %case_b 58 i32 2, label %case_c 59 i32 3, label %case_d 60 i32 4, label %case_e ], !prof !1 61 62 ; CHECK-NEXT: case_a: float = 0.05, 63 case_a: 64 br label %exit 65 66 ; CHECK-NEXT: case_b: float = 0.05, 67 case_b: 68 br label %exit 69 70 ; The 'case_c' branch is predicted more likely via branch weight metadata. 71 ; CHECK-NEXT: case_c: float = 0.8, 72 case_c: 73 br label %exit 74 75 ; CHECK-NEXT: case_d: float = 0.05, 76 case_d: 77 br label %exit 78 79 ; CHECK-NEXT: case_e: float = 0.05, 80 case_e: 81 br label %exit 82 83 ; CHECK-NEXT: exit: float = 1.0, int = [[ENTRY]] 84 exit: 85 %result = phi i32 [ %a, %case_a ], 86 [ %b, %case_b ], 87 [ %c, %case_c ], 88 [ %d, %case_d ], 89 [ %e, %case_e ] 90 ret i32 %result 91 } 92 93 !1 = !{!"branch_weights", i32 4, i32 4, i32 64, i32 4, i32 4} 94 95 define void @nested_loops(i32 %a) { 96 ; CHECK-LABEL: Printing analysis {{.*}} for function 'nested_loops': 97 ; CHECK-NEXT: block-frequency-info: nested_loops 98 ; CHECK-NEXT: entry: float = 1.0, int = [[ENTRY:[0-9]+]] 99 entry: 100 br label %for.cond1.preheader 101 102 ; CHECK-NEXT: for.cond1.preheader: float = 4001.0, 103 for.cond1.preheader: 104 %x.024 = phi i32 [ 0, %entry ], [ %inc12, %for.inc11 ] 105 br label %for.cond4.preheader 106 107 ; CHECK-NEXT: for.cond4.preheader: float = 16007984.8, 108 for.cond4.preheader: 109 %y.023 = phi i32 [ 0, %for.cond1.preheader ], [ %inc9, %for.inc8 ] 110 %add = add i32 %y.023, %x.024 111 br label %for.body6 112 113 ; CHECK-NEXT: for.body6: float = 64047914563.9, 114 for.body6: 115 %z.022 = phi i32 [ 0, %for.cond4.preheader ], [ %inc, %for.body6 ] 116 %add7 = add i32 %add, %z.022 117 tail call void @g(i32 %add7) 118 %inc = add i32 %z.022, 1 119 %cmp5 = icmp ugt i32 %inc, %a 120 br i1 %cmp5, label %for.inc8, label %for.body6, !prof !2 121 122 ; CHECK-NEXT: for.inc8: float = 16007984.8, 123 for.inc8: 124 %inc9 = add i32 %y.023, 1 125 %cmp2 = icmp ugt i32 %inc9, %a 126 br i1 %cmp2, label %for.inc11, label %for.cond4.preheader, !prof !2 127 128 ; CHECK-NEXT: for.inc11: float = 4001.0, 129 for.inc11: 130 %inc12 = add i32 %x.024, 1 131 %cmp = icmp ugt i32 %inc12, %a 132 br i1 %cmp, label %for.end13, label %for.cond1.preheader, !prof !2 133 134 ; CHECK-NEXT: for.end13: float = 1.0, int = [[ENTRY]] 135 for.end13: 136 ret void 137 } 138 139 declare void @g(i32) 140 141 !2 = !{!"branch_weights", i32 1, i32 4000} 142
