From 0db30adcfbaa857ca7c93a91208a229e21702488 Mon Sep 17 00:00:00 2001
From: Nikita Popov <npopov@redhat.com>
Date: Wed, 19 Jan 2022 15:50:32 +0100
Subject: [PATCH] [MemCpyOpt] Test invalid noalias metadata after call slot opt
 (NFC)

---
 llvm/test/Transforms/MemCpyOpt/callslot_noalias.ll | 25 ++++++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100644 llvm/test/Transforms/MemCpyOpt/callslot_noalias.ll

diff --git a/llvm/test/Transforms/MemCpyOpt/callslot_noalias.ll b/llvm/test/Transforms/MemCpyOpt/callslot_noalias.ll
new file mode 100644
index 0000000..0a6008a
--- /dev/null
+++ b/llvm/test/Transforms/MemCpyOpt/callslot_noalias.ll
@@ -0,0 +1,25 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt -S -memcpyopt < %s | FileCheck %s
+
+declare void @func(i8* %dst)
+
+; TODO: The noalias metadata on the call is currently incorrect.
+define i8 @test(i8* dereferenceable(1) noalias %dst) {
+; CHECK-LABEL: @test(
+; CHECK-NEXT:    [[TMP:%.*]] = alloca i8, align 1
+; CHECK-NEXT:    call void @func(i8* nocapture [[DST:%.*]]) #[[ATTR0:[0-9]+]], !noalias !0
+; CHECK-NEXT:    [[V2:%.*]] = load i8, i8* [[DST]], align 1, !alias.scope !0
+; CHECK-NEXT:    ret i8 [[V2]]
+;
+  %tmp = alloca i8
+  call void @func(i8* nocapture %tmp) nounwind, !noalias !0
+  %v = load i8, i8* %tmp, !noalias !0
+  store i8 %v, i8* %dst, !alias.scope !0
+  %v2 = load i8, i8* %dst, !alias.scope !0
+  ret i8 %v2
+}
+
+!0 = !{!1}
+!1 = !{!1, !2}
+!2 = !{!2}
+
-- 
2.7.4