From 30a94e3b4203cee64db0edd997780bbe4ad0acdc Mon Sep 17 00:00:00 2001
From: Torok Edwin <edwintorok@gmail.com>
Date: Thu, 24 Sep 2009 09:47:18 +0000
Subject: Don't constant propagate byval pointers, since they are not really
 pointers, but rather structs passed by value. This fixes PR5038.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82689 91177308-0d34-0410-b5e6-96231b3b80d8
---
 .../IPConstantProp/2009-09-24-byval-ptr.ll         | 24 ++++++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100644 test/Transforms/IPConstantProp/2009-09-24-byval-ptr.ll

(limited to 'test')

diff --git a/test/Transforms/IPConstantProp/2009-09-24-byval-ptr.ll b/test/Transforms/IPConstantProp/2009-09-24-byval-ptr.ll
new file mode 100644
index 0000000..75055d4
--- /dev/null
+++ b/test/Transforms/IPConstantProp/2009-09-24-byval-ptr.ll
@@ -0,0 +1,24 @@
+; RUN: llvm-as <%s | opt -ipsccp | llvm-dis | FileCheck %s
+; Don't constant-propagate byval pointers, since they are not pointers!
+; PR5038
+%struct.MYstr = type { i8, i32 }
+@mystr = internal global %struct.MYstr zeroinitializer ; <%struct.MYstr*> [#uses=3]
+define internal void @vfu1(%struct.MYstr* byval align 4 %u) nounwind {
+entry:
+  %0 = getelementptr %struct.MYstr* %u, i32 0, i32 1 ; <i32*> [#uses=1]
+  store i32 99, i32* %0, align 4
+; CHECK: %struct.MYstr* %u
+  %1 = getelementptr %struct.MYstr* %u, i32 0, i32 0 ; <i8*> [#uses=1]
+  store i8 97, i8* %1, align 4
+; CHECK: %struct.MYstr* %u
+  br label %return
+
+return:                                           ; preds = %entry
+  ret void
+}
+define void @unions() nounwind {
+entry:
+  call void @vfu1(%struct.MYstr* byval align 4 @mystr) nounwind
+  ret void
+}
+
-- 
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