1469d82e1c
As defined in LangRef, branching on `undef` is undefined behavior. This PR aims to remove undefined behavior from tests. As UB tests break Alive2 and may be the root cause of breaking future optimizations. Here's an Alive2 proof for one of the examples: https://alive2.llvm.org/ce/z/TncxhP
71 lines
2.2 KiB
LLVM
71 lines
2.2 KiB
LLVM
; RUN: opt -disable-output -aa-pipeline=basic-aa -passes='loop-mssa(licm),print<memoryssa>' < %s 2>&1 | FileCheck %s
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; CHECK-LABEL: @f(i1 %arg)
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; CHECK: lbl1:
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; CHECK-NEXT: ; [[NO4:.*]] = MemoryPhi({entry,liveOnEntry},{lbl1.backedge,[[NO9:.*]]})
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; CHECK-NEXT: ; [[NO2:.*]] = MemoryDef([[NO4]])
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; CHECK-NEXT: call void @g()
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; CHECK-NEXT: br i1 %arg, label %for.end, label %if.else
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; CHECK: for.end:
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; CHECK-NEXT: br i1 %arg, label %lbl3, label %lbl2
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; CHECK: lbl2:
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; CHECK-NEXT: ; [[NO8:.*]] = MemoryPhi({lbl3,[[NO7:.*]]},{for.end,[[NO2]]})
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; CHECK-NEXT: br label %lbl3
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; CHECK: lbl3:
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; CHECK-NEXT: [[NO7]] = MemoryPhi({lbl2,[[NO8]]},{for.end,2})
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; CHECK: cleanup:
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; CHECK-NEXT: MemoryUse([[NO2]])
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; CHECK-NEXT: %cleanup.dest = load i32, ptr undef, align 1
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; CHECK: lbl1.backedge:
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; CHECK-NEXT: [[NO9]] = MemoryPhi({cleanup,[[NO7]]},{if.else,2})
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; CHECK-NEXT: br label %lbl1
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; CHECK: cleanup.cont:
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; CHECK-NEXT: ; [[NO6:.*]] = MemoryDef([[NO7]])
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; CHECK-NEXT: store i16 undef, ptr %e, align 1
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; CHECK-NEXT: 3 = MemoryDef([[NO6]])
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; CHECK-NEXT: call void @llvm.lifetime.end.p0(i64 1, ptr null)
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define void @f(i1 %arg) {
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entry:
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%e = alloca i16, align 1
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br label %lbl1
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lbl1: ; preds = %if.else, %cleanup, %entry
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store i16 undef, ptr %e, align 1
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call void @g()
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br i1 %arg, label %for.end, label %if.else
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for.end: ; preds = %lbl1
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br i1 %arg, label %lbl3, label %lbl2
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lbl2: ; preds = %lbl3, %for.end
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br label %lbl3
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lbl3: ; preds = %lbl2, %for.end
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br i1 %arg, label %lbl2, label %cleanup
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cleanup: ; preds = %lbl3
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%cleanup.dest = load i32, ptr undef, align 1
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%switch = icmp ult i32 %cleanup.dest, 1
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br i1 %switch, label %cleanup.cont, label %lbl1
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cleanup.cont: ; preds = %cleanup
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call void @llvm.lifetime.end.p0(i64 1, ptr null)
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ret void
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if.else: ; preds = %lbl1
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br label %lbl1
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}
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declare void @g()
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; Function Attrs: argmemonly nounwind willreturn
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declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture)
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