| ; RUN: opt -simplifycfg -S < %s | FileCheck %s | |
| declare void @bar() nounwind | |
| define i32 @test1(i32* %a, i32 %b, i32* %c, i32 %d) nounwind { | |
| entry: | |
| %tobool = icmp eq i32 %b, 0 | |
| br i1 %tobool, label %if.else, label %if.then | |
| if.then: ; preds = %entry | |
| tail call void @bar() nounwind | |
| br label %if.end7 | |
| if.else: ; preds = %entry | |
| %tobool3 = icmp eq i32 %d, 0 | |
| br i1 %tobool3, label %if.end7, label %if.then4 | |
| if.then4: ; preds = %if.else | |
| tail call void @bar() nounwind | |
| br label %if.end7 | |
| if.end7: ; preds = %if.else, %if.then4, %if.then | |
| %x.0 = phi i32* [ %a, %if.then ], [ %c, %if.then4 ], [ null, %if.else ] | |
| %tmp9 = load i32* %x.0 | |
| ret i32 %tmp9 | |
| ; CHECK: @test1 | |
| ; CHECK: if.else: | |
| ; CHECK: br label %if.end7 | |
| ; CHECK: phi i32* [ %a, %if.then ], [ %c, %if.else ] | |
| } | |
| define i32 @test2(i32* %a, i32 %b, i32* %c, i32 %d) nounwind { | |
| entry: | |
| %tobool = icmp eq i32 %b, 0 | |
| br i1 %tobool, label %if.else, label %if.then | |
| if.then: ; preds = %entry | |
| tail call void @bar() nounwind | |
| br label %if.end7 | |
| if.else: ; preds = %entry | |
| %tobool3 = icmp eq i32 %d, 0 | |
| br i1 %tobool3, label %if.end7, label %if.then4 | |
| if.then4: ; preds = %if.else | |
| tail call void @bar() nounwind | |
| br label %if.end7 | |
| if.end7: ; preds = %if.else, %if.then4, %if.then | |
| %x.0 = phi i32* [ %a, %if.then ], [ null, %if.then4 ], [ null, %if.else ] | |
| %tmp9 = load i32* %x.0 | |
| ret i32 %tmp9 | |
| ; CHECK: @test2 | |
| ; CHECK: if.else: | |
| ; CHECK: unreachable | |
| ; CHECK-NOT: phi | |
| } | |
| define i32 @test3(i32* %a, i32 %b, i32* %c, i32 %d) nounwind { | |
| entry: | |
| %tobool = icmp eq i32 %b, 0 | |
| br i1 %tobool, label %if.else, label %if.then | |
| if.then: ; preds = %entry | |
| tail call void @bar() nounwind | |
| br label %if.end7 | |
| if.else: ; preds = %entry | |
| %tobool3 = icmp eq i32 %d, 0 | |
| br i1 %tobool3, label %if.end7, label %if.then4 | |
| if.then4: ; preds = %if.else | |
| tail call void @bar() nounwind | |
| br label %if.end7 | |
| if.end7: ; preds = %if.else, %if.then4, %if.then | |
| %x.0 = phi i32* [ %a, %if.then ], [ null, %if.then4 ], [ null, %if.else ] | |
| tail call void @bar() nounwind | |
| %tmp9 = load i32* %x.0 | |
| ret i32 %tmp9 | |
| ; CHECK: @test3 | |
| ; CHECK: if.end7: | |
| ; CHECK: phi i32* [ %a, %if.then ], [ null, %if.then4 ], [ null, %if.else ] | |
| } |