| Benjamin Kramer | fb212a6 | 2011-08-26 01:22:29 +0000 | [diff] [blame] | 1 | ; RUN: opt -simplifycfg -S < %s | FileCheck %s |
| 2 | |
| 3 | declare void @bar() nounwind |
| 4 | |
| 5 | define i32 @test1(i32* %a, i32 %b, i32* %c, i32 %d) nounwind { |
| 6 | entry: |
| 7 | %tobool = icmp eq i32 %b, 0 |
| 8 | br i1 %tobool, label %if.else, label %if.then |
| 9 | |
| 10 | if.then: ; preds = %entry |
| 11 | tail call void @bar() nounwind |
| 12 | br label %if.end7 |
| 13 | |
| 14 | if.else: ; preds = %entry |
| 15 | %tobool3 = icmp eq i32 %d, 0 |
| 16 | br i1 %tobool3, label %if.end7, label %if.then4 |
| 17 | |
| 18 | if.then4: ; preds = %if.else |
| 19 | tail call void @bar() nounwind |
| 20 | br label %if.end7 |
| 21 | |
| 22 | if.end7: ; preds = %if.else, %if.then4, %if.then |
| 23 | %x.0 = phi i32* [ %a, %if.then ], [ %c, %if.then4 ], [ null, %if.else ] |
| 24 | %tmp9 = load i32* %x.0 |
| 25 | ret i32 %tmp9 |
| 26 | |
| 27 | ; CHECK: @test1 |
| 28 | ; CHECK: if.else: |
| 29 | ; CHECK: br label %if.end7 |
| 30 | |
| 31 | ; CHECK: phi i32* [ %a, %if.then ], [ %c, %if.else ] |
| 32 | } |
| 33 | |
| 34 | define i32 @test2(i32* %a, i32 %b, i32* %c, i32 %d) nounwind { |
| 35 | entry: |
| 36 | %tobool = icmp eq i32 %b, 0 |
| 37 | br i1 %tobool, label %if.else, label %if.then |
| 38 | |
| 39 | if.then: ; preds = %entry |
| 40 | tail call void @bar() nounwind |
| 41 | br label %if.end7 |
| 42 | |
| 43 | if.else: ; preds = %entry |
| 44 | %tobool3 = icmp eq i32 %d, 0 |
| 45 | br i1 %tobool3, label %if.end7, label %if.then4 |
| 46 | |
| 47 | if.then4: ; preds = %if.else |
| 48 | tail call void @bar() nounwind |
| 49 | br label %if.end7 |
| 50 | |
| 51 | if.end7: ; preds = %if.else, %if.then4, %if.then |
| 52 | %x.0 = phi i32* [ %a, %if.then ], [ null, %if.then4 ], [ null, %if.else ] |
| 53 | %tmp9 = load i32* %x.0 |
| 54 | ret i32 %tmp9 |
| 55 | ; CHECK: @test2 |
| 56 | ; CHECK: if.else: |
| 57 | ; CHECK: unreachable |
| 58 | |
| 59 | ; CHECK-NOT: phi |
| 60 | } |
| 61 | |
| 62 | define i32 @test3(i32* %a, i32 %b, i32* %c, i32 %d) nounwind { |
| 63 | entry: |
| 64 | %tobool = icmp eq i32 %b, 0 |
| 65 | br i1 %tobool, label %if.else, label %if.then |
| 66 | |
| 67 | if.then: ; preds = %entry |
| 68 | tail call void @bar() nounwind |
| 69 | br label %if.end7 |
| 70 | |
| 71 | if.else: ; preds = %entry |
| 72 | %tobool3 = icmp eq i32 %d, 0 |
| 73 | br i1 %tobool3, label %if.end7, label %if.then4 |
| 74 | |
| 75 | if.then4: ; preds = %if.else |
| 76 | tail call void @bar() nounwind |
| 77 | br label %if.end7 |
| 78 | |
| 79 | if.end7: ; preds = %if.else, %if.then4, %if.then |
| 80 | %x.0 = phi i32* [ %a, %if.then ], [ null, %if.then4 ], [ null, %if.else ] |
| 81 | tail call void @bar() nounwind |
| 82 | %tmp9 = load i32* %x.0 |
| 83 | ret i32 %tmp9 |
| 84 | ; CHECK: @test3 |
| 85 | ; CHECK: if.end7: |
| 86 | ; CHECK: phi i32* [ %a, %if.then ], [ null, %if.then4 ], [ null, %if.else ] |
| 87 | } |