Add test for r133251.

llvm-svn: 133339

Author: nlewycky

llvm/test/Transforms/Mem2Reg/ignore-lifetime.ll

@@ -0,0 +1,26 @@
+; RUN: opt -mem2reg -S -o - < %s | FileCheck %s
+
+declare void @llvm.lifetime.start(i64 %size, i8* nocapture %ptr)
+declare void @llvm.lifetime.end(i64 %size, i8* nocapture %ptr)
+
+define void @test1() {
+; CHECK: test1
+; CHECK-NOT: alloca
+  %A = alloca i32
+  %B = bitcast i32* %A to i8*
+  call void @llvm.lifetime.start(i64 2, i8* %B)
+  store i32 1, i32* %A
+  call void @llvm.lifetime.end(i64 2, i8* %B)
+  ret void
+}
+
+define void @test2() {
+; CHECK: test2
+; CHECK-NOT: alloca
+  %A = alloca {i8, i16}
+  %B = getelementptr {i8, i16}* %A, i32 0, i32 0
+  call void @llvm.lifetime.start(i64 2, i8* %B)
+  store {i8, i16} zeroinitializer, {i8, i16}* %A
+  call void @llvm.lifetime.end(i64 2, i8* %B)
+  ret void
+}