| ; 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, i32* %x.0 |
| ret i32 %tmp9 |
| |
| ; CHECK-LABEL: @test1( |
| ; CHECK: if.else: |
| ; CHECK: br label %if.end7 |
| |
| ; CHECK: phi i32* [ %a, %if.then ], [ %c, %if.else ] |
| } |
| |
| define i32 @test1_no_null_opt(i32* %a, i32 %b, i32* %c, i32 %d) nounwind #0 { |
| 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, i32* %x.0 |
| ret i32 %tmp9 |
| |
| ; CHECK-LABEL: @test1_no_null_opt( |
| ; CHECK: if.then: |
| ; CHECK: if.else: |
| ; CHECK: if.then4: |
| ; CHECK: br label %if.end7 |
| ; CHECK: if.end7: |
| ; CHECK-NEXT: phi i32* [ %a, %if.then ], [ %c, %if.then4 ], [ null, %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, i32* %x.0 |
| ret i32 %tmp9 |
| ; CHECK-LABEL: @test2( |
| ; CHECK: if.else: |
| ; CHECK: unreachable |
| |
| ; CHECK-NOT: phi |
| } |
| |
| define i32 @test2_no_null_opt(i32* %a, i32 %b, i32* %c, i32 %d) nounwind #0 { |
| 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, i32* %x.0 |
| ret i32 %tmp9 |
| ; CHECK-LABEL: @test2_no_null_opt( |
| ; CHECK: if.then: |
| ; CHECK: if.else: |
| ; CHECK: if.then4: |
| ; CHECK: if.end7: |
| ; CHECK-NEXT: phi i32* [ %a, %if.then ], [ null, %if.then4 ], [ null, %if.else ] |
| } |
| |
| 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, i32* %x.0 |
| ret i32 %tmp9 |
| ; CHECK-LABEL: @test3( |
| ; CHECK: if.end7: |
| ; CHECK: phi i32* [ %a, %if.then ], [ null, %if.then4 ], [ null, %if.else ] |
| } |
| |
| define i32 @test3_no_null_opt(i32* %a, i32 %b, i32* %c, i32 %d) nounwind #0 { |
| 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, i32* %x.0 |
| ret i32 %tmp9 |
| ; CHECK-LABEL: @test3_no_null_opt( |
| ; CHECK: if.then: |
| ; CHECK: if.else: |
| ; CHECK: if.then4: |
| ; CHECK: if.end7: |
| ; CHECK-NEXT: phi i32* [ %a, %if.then ], [ null, %if.then4 ], [ null, %if.else ] |
| } |
| |
| define i32 @test4(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 ] |
| %gep = getelementptr i32, i32* %x.0, i32 10 |
| %tmp9 = load i32, i32* %gep |
| %tmp10 = or i32 %tmp9, 1 |
| store i32 %tmp10, i32* %gep |
| ret i32 %tmp9 |
| ; CHECK-LABEL: @test4( |
| ; CHECK-NOT: phi |
| } |
| |
| define i32 @test4_no_null_opt(i32* %a, i32 %b, i32* %c, i32 %d) nounwind #0 { |
| 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 ] |
| %gep = getelementptr i32, i32* %x.0, i32 10 |
| %tmp9 = load i32, i32* %gep |
| %tmp10 = or i32 %tmp9, 1 |
| store i32 %tmp10, i32* %gep |
| ret i32 %tmp9 |
| ; CHECK-LABEL: @test4_no_null_opt( |
| ; CHECK: if.then: |
| ; CHECK: if.else: |
| ; CHECK: if.then4: |
| ; CHECK: if.end7: |
| ; CHECK-NEXT: phi i32* [ %a, %if.then ], [ null, %if.then4 ], [ null, %if.else ] |
| } |
| |
| attributes #0 = { "null-pointer-is-valid"="true" } |
