| Sanjoy Das | 13e63a2 | 2015-10-28 21:27:08 +0000 | [diff] [blame] | 1 | ; RUN: opt -jump-threading -S < %s | FileCheck %s |
| 2 | |
| 3 | declare void @side_effect(i32) |
| 4 | |
| 5 | define void @test0(i32 %i, i32 %len) { |
| 6 | ; CHECK-LABEL: @test0( |
| 7 | entry: |
| 8 | call void @side_effect(i32 0) |
| 9 | %i.inc = add nuw i32 %i, 1 |
| 10 | %c0 = icmp ult i32 %i.inc, %len |
| 11 | br i1 %c0, label %left, label %right |
| 12 | |
| 13 | left: |
| 14 | ; CHECK: entry: |
| 15 | ; CHECK: br i1 %c0, label %left0, label %right |
| 16 | |
| 17 | ; CHECK: left0: |
| 18 | ; CHECK: call void @side_effect |
| 19 | ; CHECK-NOT: br i1 %c1 |
| 20 | ; CHECK: call void @side_effect |
| 21 | call void @side_effect(i32 0) |
| 22 | %c1 = icmp ult i32 %i, %len |
| 23 | br i1 %c1, label %left0, label %right |
| 24 | |
| 25 | left0: |
| 26 | call void @side_effect(i32 0) |
| 27 | ret void |
| 28 | |
| 29 | right: |
| 30 | %t = phi i32 [ 1, %left ], [ 2, %entry ] |
| 31 | call void @side_effect(i32 %t) |
| 32 | ret void |
| 33 | } |
| 34 | |
| 35 | define void @test1(i32 %i, i32 %len) { |
| 36 | ; CHECK-LABEL: @test1( |
| 37 | entry: |
| 38 | call void @side_effect(i32 0) |
| 39 | %i.inc = add nsw i32 %i, 1 |
| 40 | %c0 = icmp slt i32 %i.inc, %len |
| 41 | br i1 %c0, label %left, label %right |
| 42 | |
| 43 | left: |
| 44 | ; CHECK: entry: |
| 45 | ; CHECK: br i1 %c0, label %left0, label %right |
| 46 | |
| 47 | ; CHECK: left0: |
| 48 | ; CHECK: call void @side_effect |
| 49 | ; CHECK-NOT: br i1 %c1 |
| 50 | ; CHECK: call void @side_effect |
| 51 | call void @side_effect(i32 0) |
| 52 | %c1 = icmp slt i32 %i, %len |
| 53 | br i1 %c1, label %left0, label %right |
| 54 | |
| 55 | left0: |
| 56 | call void @side_effect(i32 0) |
| 57 | ret void |
| 58 | |
| 59 | right: |
| 60 | %t = phi i32 [ 1, %left ], [ 2, %entry ] |
| 61 | call void @side_effect(i32 %t) |
| 62 | ret void |
| 63 | } |
| 64 | |
| 65 | define void @test2(i32 %i, i32 %len, i1* %c.ptr) { |
| 66 | ; CHECK-LABEL: @test2( |
| 67 | |
| 68 | ; CHECK: entry: |
| 69 | ; CHECK: br i1 %c0, label %cont, label %right |
| 70 | ; CHECK: cont: |
| 71 | ; CHECK: br i1 %c, label %left0, label %right |
| 72 | ; CHECK: left0: |
| 73 | ; CHECK: call void @side_effect(i32 0) |
| 74 | ; CHECK: call void @side_effect(i32 0) |
| 75 | entry: |
| 76 | call void @side_effect(i32 0) |
| 77 | %i.inc = add nsw i32 %i, 1 |
| 78 | %c0 = icmp slt i32 %i.inc, %len |
| 79 | br i1 %c0, label %cont, label %right |
| 80 | |
| 81 | cont: |
| 82 | %c = load i1, i1* %c.ptr |
| 83 | br i1 %c, label %left, label %right |
| 84 | |
| 85 | left: |
| 86 | call void @side_effect(i32 0) |
| 87 | %c1 = icmp slt i32 %i, %len |
| 88 | br i1 %c1, label %left0, label %right |
| 89 | |
| 90 | left0: |
| 91 | call void @side_effect(i32 0) |
| 92 | ret void |
| 93 | |
| 94 | right: |
| 95 | %t = phi i32 [ 1, %left ], [ 2, %entry ], [ 3, %cont ] |
| 96 | call void @side_effect(i32 %t) |
| 97 | ret void |
| 98 | } |