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llvm-mirror/test/Transforms/SimplifyCFG/phi-undef-loadstore.ll
Roman Lebedev eda37b998a [SimplifyCFG] MergeBlockIntoPredecessor() already knows how to preserve DomTree 
... so just ensure that we pass DomTreeUpdater it into it.

Fixes DomTree preservation for a large number of tests,
all of which are marked as such so that they do not regress.
2020-12-17 01:03:49 +03:00

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; RUN: opt -simplifycfg -simplifycfg-require-and-preserve-domtree=1 -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 }
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