Fix handling of aliases to functions.

An alias to a function should use pc relative addressing.

llvm-svn: 168199

2 files changed, 41 insertions, 13 deletions

diff --git a/llvm/lib/Target/XCore/XCoreISelLowering.cpp b/llvm/lib/Target/XCore/XCoreISelLowering.cpp
index 9e7816e21f8..f1098f9dc35 100644
--- a/llvm/lib/Target/XCore/XCoreISelLowering.cpp
+++ b/llvm/lib/Target/XCore/XCoreISelLowering.cpp
@@ -225,20 +225,16 @@ getGlobalAddressWrapper(SDValue GA, const GlobalValue *GV,
 {
   // FIXME there is no actual debug info here
   DebugLoc dl = GA.getDebugLoc();
-  if (isa<Function>(GV)) {
-    return DAG.getNode(XCoreISD::PCRelativeWrapper, dl, MVT::i32, GA);
+  const GlobalValue *UnderlyingGV = GV;
+  // If GV is an alias then use the aliasee to determine the wrapper type
+  if (const GlobalAlias *GA = dyn_cast<GlobalAlias>(GV))
+    UnderlyingGV = GA->resolveAliasedGlobal();
+  if (const GlobalVariable *GVar = dyn_cast<GlobalVariable>(UnderlyingGV)) {
+    if (GVar->isConstant())
+      return DAG.getNode(XCoreISD::CPRelativeWrapper, dl, MVT::i32, GA);
+    return DAG.getNode(XCoreISD::DPRelativeWrapper, dl, MVT::i32, GA);
   }
-  const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV);
-  if (!GVar) {
-    // If GV is an alias then use the aliasee to determine constness
-    if (const GlobalAlias *GA = dyn_cast<GlobalAlias>(GV))
-      GVar = dyn_cast_or_null<GlobalVariable>(GA->resolveAliasedGlobal());
-  }
-  bool isConst = GVar && GVar->isConstant();
-  if (isConst) {
-    return DAG.getNode(XCoreISD::CPRelativeWrapper, dl, MVT::i32, GA);
-  }
-  return DAG.getNode(XCoreISD::DPRelativeWrapper, dl, MVT::i32, GA);
+  return DAG.getNode(XCoreISD::PCRelativeWrapper, dl, MVT::i32, GA);
 }
 
 SDValue XCoreTargetLowering::
diff --git a/llvm/test/CodeGen/XCore/aliases.ll b/llvm/test/CodeGen/XCore/aliases.ll
new file mode 100644
index 00000000000..d83b246a552
--- /dev/null
+++ b/llvm/test/CodeGen/XCore/aliases.ll
@@ -0,0 +1,32 @@
+; RUN: llc < %s -march=xcore | FileCheck %s
+declare void @a_val() nounwind
+@b_val = external constant i32, section ".cp.rodata"
+@c_val = external global i32
+
+@a = alias void ()* @a_val
+@b = alias i32* @b_val
+@c = alias i32* @c_val
+
+; CHECK: a_addr:
+; CHECK: ldap r11, a
+; CHECK: retsp
+define void ()* @a_addr() nounwind {
+entry:
+  ret void ()* @a
+}
+
+; CHECK: b_addr:
+; CHECK: ldaw r11, cp[b]
+; CHECK: retsp
+define i32 *@b_addr() nounwind {
+entry:
+  ret i32* @b
+}
+
+; CHECK: c_addr:
+; CHECK: ldaw r0, dp[c]
+; CHECK: retsp
+define i32 *@c_addr() nounwind {
+entry:
+  ret i32* @c
+}