[PowerPC] Load BlockAddress values from the TOC in 64-bit SVR4 code

Since block address values can be larger than 2GB in 64-bit code, they
cannot be loaded simply using an @l / @ha pair, but instead must be
loaded from the TOC, just like GlobalAddress, ConstantPool, and
JumpTable values are.

The commit also fixes a bug in PPCLinuxAsmPrinter::doFinalization where
temporary labels could not be used as TOC values, since code would
attempt (and fail) to use GetOrCreateSymbol to create a symbol of the
same name as the temporary label.

llvm-svn: 220959

1 files changed, 3 insertions, 2 deletions

diff --git a/llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp b/llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp
index 2d3006310d3..0b731cfba6a 100644
--- a/llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp
+++ b/llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp
@@ -1452,7 +1452,7 @@ SDNode *PPCDAGToDAGISel::Select(SDNode *N) {
 
     // For medium and large code model, we generate two instructions as
     // described below.  Otherwise we allow SelectCodeCommon to handle this,
-    // selecting one of LDtoc, LDtocJTI, and LDtocCPT.
+    // selecting one of LDtoc, LDtocJTI, LDtocCPT, and LDtocBA.
     CodeModel::Model CModel = TM.getCodeModel();
     if (CModel != CodeModel::Medium && CModel != CodeModel::Large)
       break;
@@ -1469,7 +1469,8 @@ SDNode *PPCDAGToDAGISel::Select(SDNode *N) {
     SDNode *Tmp = CurDAG->getMachineNode(PPC::ADDIStocHA, dl, MVT::i64,
                                         TOCbase, GA);
 
-    if (isa<JumpTableSDNode>(GA) || CModel == CodeModel::Large)
+    if (isa<JumpTableSDNode>(GA) || isa<BlockAddressSDNode>(GA) ||
+        CModel == CodeModel::Large)
       return CurDAG->getMachineNode(PPC::LDtocL, dl, MVT::i64, GA,
                                     SDValue(Tmp, 0));