From f00833c4013446701506a156d370584520c86b45 Mon Sep 17 00:00:00 2001
From: Dan Gohman <gohman@apple.com>
Date: Thu, 11 Nov 2010 01:03:30 +0000
Subject: [PATCH] Add a testcase which demonstrates alias analysis pass
 precedence.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118755 91177308-0d34-0410-b5e6-96231b3b80d8
---
 .../TypeBasedAliasAnalysis/precedence.ll      | 21 +++++++++++++++++++
 1 file changed, 21 insertions(+)
 create mode 100644 test/Analysis/TypeBasedAliasAnalysis/precedence.ll

diff --git a/test/Analysis/TypeBasedAliasAnalysis/precedence.ll b/test/Analysis/TypeBasedAliasAnalysis/precedence.ll
new file mode 100644
index 00000000000..b2095b05722
--- /dev/null
+++ b/test/Analysis/TypeBasedAliasAnalysis/precedence.ll
@@ -0,0 +1,21 @@
+; RUN: opt -enable-tbaa -basicaa -tbaa -gvn -instcombine -S < %s | grep {ret i32 0}
+; RUN: opt -enable-tbaa -tbaa -basicaa -gvn -instcombine -S < %s | grep {ret i32 1075000115}
+
+; According to the TBAA metadata the load and store don't alias. However,
+; according to the actual code, they do. The order of the alias analysis
+; passes should determine which of these takes precedence.
+
+target datalayout = "e-p:64:64:64"
+
+define i32 @trouble(i32* %x) nounwind ssp {
+entry:
+  store i32 0, i32* %x, !tbaa !0
+  %0 = bitcast i32* %x to float*
+  store float 0x4002666660000000, float* %0, !tbaa !3
+  %tmp3 = load i32* %x, !tbaa !0
+  ret i32 %tmp3
+}
+
+!0 = metadata !{metadata !"int", metadata !1}
+!1 = metadata !{metadata !"simple"}
+!3 = metadata !{metadata !"float", metadata !1}