This patch addresses bug 14678 by fixing two problems in medium code model
code generation. Variables addressed through a GlobalAlias were not being
handled, and variables with available_externally linkage were treated
incorrectly. The patch contains two new tests to verify the correct code
generation for these cases.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171778 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/PowerPC/PPCISelDAGToDAG.cpp b/lib/Target/PowerPC/PPCISelDAGToDAG.cpp
index 9ac0a27..762b346 100644
--- a/lib/Target/PowerPC/PPCISelDAGToDAG.cpp
+++ b/lib/Target/PowerPC/PPCISelDAGToDAG.cpp
@@ -25,6 +25,7 @@
#include "llvm/IR/Function.h"
#include "llvm/IR/GlobalValue.h"
#include "llvm/IR/GlobalVariable.h"
+#include "llvm/IR/GlobalAlias.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
@@ -1296,14 +1297,18 @@
if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(GA)) {
const GlobalValue *GValue = G->getGlobal();
- const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GValue);
- assert((GVar || isa<Function>(GValue)) &&
+ const GlobalAlias *GAlias = dyn_cast<GlobalAlias>(GValue);
+ const GlobalValue *RealGValue = GAlias ?
+ GAlias->resolveAliasedGlobal(false) : GValue;
+ const GlobalVariable *GVar = dyn_cast<GlobalVariable>(RealGValue);
+ assert((GVar || isa<Function>(RealGValue)) &&
"Unexpected global value subclass!");
// An external variable is one without an initializer. For these,
// for variables with common linkage, and for Functions, generate
// the LDtocL form.
- if (!GVar || !GVar->hasInitializer() || GValue->hasCommonLinkage())
+ if (!GVar || !GVar->hasInitializer() || RealGValue->hasCommonLinkage() ||
+ RealGValue->hasAvailableExternallyLinkage())
return CurDAG->getMachineNode(PPC::LDtocL, dl, MVT::i64, GA,
SDValue(Tmp, 0));
}