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-rw-r--r--llvm/test/Analysis/MemorySSA/lifetime-simple.ll30
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diff --git a/llvm/test/Analysis/MemorySSA/lifetime-simple.ll b/llvm/test/Analysis/MemorySSA/lifetime-simple.ll
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+++ b/llvm/test/Analysis/MemorySSA/lifetime-simple.ll
@@ -0,0 +1,30 @@
+; RUN: opt -basicaa -print-memoryssa -verify-memoryssa -analyze < %s 2>&1 | FileCheck %s
+; RUN: opt -aa-pipeline=basic-aa -passes='print<memoryssa>,verify<memoryssa>' -disable-output < %s 2>&1 | FileCheck %s
+; This test checks a number of things:
+; First, the lifetime markers should not clobber any uses of Q or P.
+; Second, the loads of P are MemoryUse(LiveOnEntry) due to the placement of the markers vs the loads.
+
+define i8 @test(i8* %P, i8* %Q) {
+entry:
+; CHECK: 1 = MemoryDef(liveOnEntry)
+; CHECK-NEXT: call void @llvm.lifetime.start.p0i8(i64 32, i8* %P)
+ call void @llvm.lifetime.start.p0i8(i64 32, i8* %P)
+; CHECK: MemoryUse(1)
+; CHECK-NEXT: %0 = load i8, i8* %P
+ %0 = load i8, i8* %P
+; CHECK: 2 = MemoryDef(1)
+; CHECK-NEXT: store i8 1, i8* %P
+ store i8 1, i8* %P
+; CHECK: 3 = MemoryDef(2)
+; CHECK-NEXT: call void @llvm.lifetime.end.p0i8(i64 32, i8* %P)
+ call void @llvm.lifetime.end.p0i8(i64 32, i8* %P)
+; CHECK: MemoryUse(liveOnEntry)
+; CHECK-NEXT: %1 = load i8, i8* %P
+ %1 = load i8, i8* %P
+; CHECK: MemoryUse(2)
+; CHECK-NEXT: %2 = load i8, i8* %Q
+ %2 = load i8, i8* %Q
+ ret i8 %1
+}
+declare void @llvm.lifetime.start.p0i8(i64 %S, i8* nocapture %P) readonly
+declare void @llvm.lifetime.end.p0i8(i64 %S, i8* nocapture %P)
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