74 lines
2.3 KiB
LLVM
74 lines
2.3 KiB
LLVM
; RUN: opt -basicaa -print-memoryssa -verify-memoryssa -analyze < %s 2>&1 | FileCheck %s
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; RUN: opt -aa-pipeline=basic-aa -passes='print<memoryssa>,verify<memoryssa>' -disable-output < %s 2>&1 | FileCheck %s
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; hfinkel's case
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; [entry]
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; |
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; .....
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; (clobbering access - b)
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; |
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; .... ________________________________
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; \ / |
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; (x) |
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; ...... |
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; | |
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; | ______________________ |
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; \ / | |
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; (starting access) | |
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; ... | |
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; (clobbering access - a) | |
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; ... | |
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; | | | |
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; | |_______________________| |
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; | |
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; |_________________________________|
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;
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; More specifically, one access, with multiple clobbering accesses. One of
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; which strictly dominates the access, the other of which has a backedge
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; readnone so we don't have a 1:1 mapping of MemorySSA edges to Instructions.
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declare void @doThingWithoutReading() readnone
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declare i8 @getValue() readnone
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declare i1 @getBool() readnone
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define hidden void @testcase(i8* %Arg) {
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Entry:
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call void @doThingWithoutReading()
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%Val.Entry = call i8 @getValue()
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; CHECK: 1 = MemoryDef(liveOnEntry)
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; CHECK-NEXT: store i8 %Val.Entry
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store i8 %Val.Entry, i8* %Arg
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call void @doThingWithoutReading()
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br label %OuterLoop
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OuterLoop:
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; CHECK: 5 = MemoryPhi({Entry,1},{InnerLoop.Tail,3})
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; CHECK-NEXT: %Val.Outer =
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%Val.Outer = call i8 @getValue()
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; CHECK: 2 = MemoryDef(5)
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; CHECK-NEXT: store i8 %Val.Outer
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store i8 %Val.Outer, i8* %Arg
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call void @doThingWithoutReading()
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br label %InnerLoop
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InnerLoop:
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; CHECK: 4 = MemoryPhi({OuterLoop,2},{InnerLoop,3})
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; CHECK-NEXT: ; MemoryUse(4)
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; CHECK-NEXT: %StartingAccess = load
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%StartingAccess = load i8, i8* %Arg, align 4
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%Val.Inner = call i8 @getValue()
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; CHECK: 3 = MemoryDef(4)
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; CHECK-NEXT: store i8 %Val.Inner
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store i8 %Val.Inner, i8* %Arg
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call void @doThingWithoutReading()
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%KeepGoing = call i1 @getBool()
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br i1 %KeepGoing, label %InnerLoop.Tail, label %InnerLoop
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InnerLoop.Tail:
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%KeepGoing.Tail = call i1 @getBool()
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br i1 %KeepGoing.Tail, label %End, label %OuterLoop
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End:
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ret void
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}
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