From ee60d39cdd63716df89009037af4eaabe3c788fe Mon Sep 17 00:00:00 2001
From: Matt Arsenault <Matthew.Arsenault@amd.com>
Date: Thu, 2 Jan 2014 20:55:01 +0000
Subject: [PATCH] Allow addrspacecast in global aliases

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@198349 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/IR/Globals.cpp                    | 3 ++-
 lib/IR/Verifier.cpp                   | 4 +++-
 test/Assembler/addrspacecast-alias.ll | 6 ++++++
 3 files changed, 11 insertions(+), 2 deletions(-)
 create mode 100644 test/Assembler/addrspacecast-alias.ll

diff --git a/lib/IR/Globals.cpp b/lib/IR/Globals.cpp
index da3b02a0fa6..cc42351f100 100644
--- a/lib/IR/Globals.cpp
+++ b/lib/IR/Globals.cpp
@@ -237,7 +237,8 @@ GlobalValue *GlobalAlias::getAliasedGlobal() {
     return GV;
 
   ConstantExpr *CE = cast<ConstantExpr>(C);
-  assert((CE->getOpcode() == Instruction::BitCast || 
+  assert((CE->getOpcode() == Instruction::BitCast ||
+          CE->getOpcode() == Instruction::AddrSpaceCast ||
           CE->getOpcode() == Instruction::GetElementPtr) &&
          "Unsupported aliasee");
   
diff --git a/lib/IR/Verifier.cpp b/lib/IR/Verifier.cpp
index 35b786ecf27..44c66c9062f 100644
--- a/lib/IR/Verifier.cpp
+++ b/lib/IR/Verifier.cpp
@@ -550,9 +550,11 @@ void Verifier::visitGlobalAlias(GlobalAlias &GA) {
     ConstantExpr *CE = dyn_cast<ConstantExpr>(Aliasee);
     Assert1(CE &&
             (CE->getOpcode() == Instruction::BitCast ||
+             CE->getOpcode() == Instruction::AddrSpaceCast ||
              CE->getOpcode() == Instruction::GetElementPtr) &&
             isa<GlobalValue>(CE->getOperand(0)),
-            "Aliasee should be either GlobalValue or bitcast of GlobalValue",
+            "Aliasee should be either GlobalValue, bitcast or "
+             "addrspacecast of GlobalValue",
             &GA);
 
     if (CE->getOpcode() == Instruction::BitCast) {
diff --git a/test/Assembler/addrspacecast-alias.ll b/test/Assembler/addrspacecast-alias.ll
new file mode 100644
index 00000000000..6623a25d184
--- /dev/null
+++ b/test/Assembler/addrspacecast-alias.ll
@@ -0,0 +1,6 @@
+; RUN: llvm-as -disable-output %s
+
+; Test that global aliases are allowed to be constant addrspacecast
+
+@i = internal addrspace(1) global i8 42
+@ia = alias internal i8 addrspace(2)* addrspacecast (i8 addrspace(1)* @i to i8 addrspace(2)*)