| Chandler Carruth | 14edd31 | 2011-10-23 21:21:50 +0000 | [diff] [blame] | 1 | ; RUN: opt < %s -analyze -branch-prob | FileCheck %s |
| 2 | |
| 3 | define i32 @test1(i32 %i, i32* %a) { |
| 4 | ; CHECK: Printing analysis {{.*}} for function 'test1' |
| 5 | entry: |
| 6 | br label %body |
| 7 | ; CHECK: edge entry -> body probability is 16 / 16 = 100% |
| 8 | |
| 9 | body: |
| 10 | %iv = phi i32 [ 0, %entry ], [ %next, %body ] |
| 11 | %base = phi i32 [ 0, %entry ], [ %sum, %body ] |
| 12 | %arrayidx = getelementptr inbounds i32* %a, i32 %iv |
| 13 | %0 = load i32* %arrayidx |
| 14 | %sum = add nsw i32 %0, %base |
| 15 | %next = add i32 %iv, 1 |
| 16 | %exitcond = icmp eq i32 %next, %i |
| 17 | br i1 %exitcond, label %exit, label %body |
| 18 | ; CHECK: edge body -> exit probability is 4 / 128 |
| 19 | ; CHECK: edge body -> body probability is 124 / 128 |
| 20 | |
| 21 | exit: |
| 22 | ret i32 %sum |
| 23 | } |
| 24 | |
| 25 | define i32 @test2(i32 %i, i32 %a, i32 %b) { |
| 26 | ; CHECK: Printing analysis {{.*}} for function 'test2' |
| 27 | entry: |
| 28 | %cond = icmp ult i32 %i, 42 |
| 29 | br i1 %cond, label %then, label %else, !prof !0 |
| 30 | ; CHECK: edge entry -> then probability is 64 / 68 |
| 31 | ; CHECK: edge entry -> else probability is 4 / 68 |
| 32 | |
| 33 | then: |
| 34 | br label %exit |
| 35 | ; CHECK: edge then -> exit probability is 16 / 16 = 100% |
| 36 | |
| 37 | else: |
| 38 | br label %exit |
| 39 | ; CHECK: edge else -> exit probability is 16 / 16 = 100% |
| 40 | |
| 41 | exit: |
| 42 | %result = phi i32 [ %a, %then ], [ %b, %else ] |
| 43 | ret i32 %result |
| 44 | } |
| 45 | |
| 46 | !0 = metadata !{metadata !"branch_weights", i32 64, i32 4} |
| 47 | |
| 48 | define i32 @test3(i32 %i, i32 %a, i32 %b, i32 %c, i32 %d, i32 %e) { |
| 49 | ; CHECK: Printing analysis {{.*}} for function 'test3' |
| 50 | entry: |
| 51 | switch i32 %i, label %case_a [ i32 1, label %case_b |
| 52 | i32 2, label %case_c |
| 53 | i32 3, label %case_d |
| 54 | i32 4, label %case_e ], !prof !1 |
| 55 | ; CHECK: edge entry -> case_a probability is 4 / 80 |
| 56 | ; CHECK: edge entry -> case_b probability is 4 / 80 |
| 57 | ; CHECK: edge entry -> case_c probability is 64 / 80 |
| 58 | ; CHECK: edge entry -> case_d probability is 4 / 80 |
| 59 | ; CHECK: edge entry -> case_e probability is 4 / 80 |
| 60 | |
| 61 | case_a: |
| 62 | br label %exit |
| 63 | ; CHECK: edge case_a -> exit probability is 16 / 16 = 100% |
| 64 | |
| 65 | case_b: |
| 66 | br label %exit |
| 67 | ; CHECK: edge case_b -> exit probability is 16 / 16 = 100% |
| 68 | |
| 69 | case_c: |
| 70 | br label %exit |
| 71 | ; CHECK: edge case_c -> exit probability is 16 / 16 = 100% |
| 72 | |
| 73 | case_d: |
| 74 | br label %exit |
| 75 | ; CHECK: edge case_d -> exit probability is 16 / 16 = 100% |
| 76 | |
| 77 | case_e: |
| 78 | br label %exit |
| 79 | ; CHECK: edge case_e -> exit probability is 16 / 16 = 100% |
| 80 | |
| 81 | exit: |
| 82 | %result = phi i32 [ %a, %case_a ], |
| 83 | [ %b, %case_b ], |
| 84 | [ %c, %case_c ], |
| 85 | [ %d, %case_d ], |
| 86 | [ %e, %case_e ] |
| 87 | ret i32 %result |
| 88 | } |
| 89 | |
| 90 | !1 = metadata !{metadata !"branch_weights", i32 4, i32 4, i32 64, i32 4, i32 4} |